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Calix, Inc – ‘10-K’ for 12/31/15 – ‘EX-101.LAB’

On:  Thursday, 2/25/16, at 8:36pm ET   ·   As of:  2/26/16   ·   For:  12/31/15   ·   Accession #:  1406666-16-41   ·   File #:  1-34674

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  As Of               Filer                 Filing    For·On·As Docs:Size

 2/26/16  Calix, Inc                        10-K       12/31/15   92:11M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.12M 
 2: EX-21.1     Subsidiaries List                                   HTML     26K 
 3: EX-23.1     Consent of Experts or Counsel                       HTML     26K 
 4: EX-31.1     Certification -- §302 - SOA'02                      HTML     34K 
 5: EX-31.2     Certification -- §302 - SOA'02                      HTML     34K 
 6: EX-32.1     Certification -- §906 - SOA'02                      HTML     31K 
13: R1          Document and Entity Information                     HTML     55K 
14: R2          Consolidated Balance Sheets                         HTML    111K 
15: R3          Consolidated Balance Sheets (Parenthetical)         HTML     48K 
16: R4          Consolidated Statements of Comprehensive Loss       HTML    112K 
17: R5          Consolidated Statements of Stockholders' Equity     HTML    102K 
18: R6          Consolidated Statements of Cash Flows               HTML    129K 
19: R7          Description of Business and Significant Accounting  HTML    109K 
                Policies                                                         
20: R8          Cash, Cash Equivalents and Marketable Securities    HTML     84K 
21: R9          Fair Value Measurements                             HTML     63K 
22: R10         Goodwill and Intangible Assets                      HTML     59K 
23: R11         Balance Sheet Details                               HTML    135K 
24: R12         Commitments and Contingencies                       HTML     89K 
25: R13         Net Loss per Share                                  HTML     45K 
26: R14         Stockholders' Equity                                HTML    206K 
27: R15         Employee Benefit Plan                               HTML     29K 
28: R16         Accumulated Other Comprehensive Income              HTML     72K 
29: R17         Credit Facility                                     HTML     40K 
30: R18         Income Taxes                                        HTML    144K 
31: R19         Segment Information                                 HTML     63K 
32: R20         Quarterly Financial Data - Unaudited                HTML     77K 
33: R21         Schedule II. Valuation and Qualifying Accounts      HTML     64K 
34: R22         Description of Business and Significant Accounting  HTML    175K 
                Policies (Policies)                                              
35: R23         Description of Business and Significant Accounting  HTML     41K 
                Policies (Tables)                                                
36: R24         Cash, Cash Equivalents and Marketable Securities    HTML     89K 
                (Tables)                                                         
37: R25         Fair Value Measurements (Tables)                    HTML     56K 
38: R26         Goodwill and Intangible Assets (Tables)             HTML     56K 
39: R27         Balance Sheet Details (Tables)                      HTML    147K 
40: R28         Commitments and Contingencies (Tables)              HTML     55K 
41: R29         Net Loss per Share (Tables)                         HTML     43K 
42: R30         Stockholders' Equity (Tables)                       HTML    181K 
43: R31         Accumulated Other Comprehensive Income (Tables)     HTML     68K 
44: R32         Income Taxes (Tables)                               HTML    139K 
45: R33         Segment Information (Tables)                        HTML     60K 
46: R34         Quarterly Financial Data - Unaudited (Tables)       HTML     75K 
47: R35         Description of Business and Significant Accounting  HTML     33K 
                Policies - Customer Concentration Risk (Details)                 
48: R36         Description of Business and Significant Accounting  HTML     35K 
                Policies - Useful Lives of Property and Equipment                
                (Details)                                                        
49: R37         Description of Business and Significant Accounting  HTML     55K 
                Policies - Textual (Detail)                                      
50: R38         Cash, Cash Equivalents and Marketable Securities    HTML     50K 
                (Details)                                                        
51: R39         Cash, Cash Equivalents and Marketable Securities -  HTML     46K 
                Amortized Cost and Fair Value (Details)                          
52: R40         Cash, Cash Equivalents and Marketable Securities -  HTML     44K 
                Contractual Maturity (Details)                                   
53: R41         Fair Value Measurements (Details)                   HTML     60K 
54: R42         Goodwill and Intangible Assets - Schedule of        HTML     38K 
                Intangible Assets (Details)                                      
55: R43         Goodwill and Intangible Assets - Expected Future    HTML     33K 
                Amortization (Details)                                           
56: R44         Goodwill and Intangible Assets - Textual (Details)  HTML     29K 
57: R45         Balance Sheet Details - Accounts Receivable         HTML     35K 
                (Details)                                                        
58: R46         Balance Sheet Details - Allowance and Product       HTML     39K 
                Return Reserve (Details)                                         
59: R47         Balance Sheet Details - Inventory (Details)         HTML     34K 
60: R48         Balance Sheet Details - Property and Equipment,     HTML     44K 
                net (Details)                                                    
61: R49         Balance Sheet Details - Accrued Liabilities         HTML     61K 
                (Details)                                                        
62: R50         Balance Sheet Details - Deferred Revenue (Details)  HTML     39K 
63: R51         Balance Sheet Details - Textual (Details)           HTML     28K 
64: R52         Commitments and Contingencies - Future Minimum      HTML     45K 
                Payments Under Operating Leases (Details)                        
65: R53         Commitments and Contingencies - Product Warranty    HTML     36K 
                Activities (Details)                                             
66: R54         Commitments and Contingencies - Textual (Details)   HTML     71K 
67: R55         Net Loss per Share - Basic and Diluted Shares       HTML     42K 
                Calculation (Details)                                            
68: R56         Stockholders' Equity - Stock Options Activity       HTML     79K 
                (Details)                                                        
69: R57         Stockholders' Equity - RSU, PRSU and RSA            HTML     68K 
                Activities (Details)                                             
70: R58         Stockholders' Equity - Fair Value of Awards         HTML     38K 
                Granted (Details)                                                
71: R59         Stockholders' Equity - Assumptions (Details)        HTML     42K 
72: R60         Stockholders' Equity - Unrecognized Stock-based     HTML     42K 
                Compensation Expenses (Details)                                  
73: R61         Stockholders' Equity - Warrants Outstanding         HTML     33K 
                (Details)                                                        
74: R62         Stockholders' Equity - Shares Reserved For Future   HTML     49K 
                Issuance (Details)                                               
75: R63         Stockholders' Equity - Textual (Details)            HTML    209K 
76: R64         Stockholders' Equity Stockholders' Equity - Stock   HTML     38K 
                Repurchase (Details)                                             
77: R65         Employee Benefit Plan - Textual (Details)           HTML     28K 
78: R66         Accumulated Other Comprehensive Income (Details)    HTML     45K 
79: R67         Credit Facility - Textual (Details)                 HTML     84K 
80: R68         Income Taxes - Loss before Provision for Income     HTML     33K 
                Taxes (Details)                                                  
81: R69         Income Taxes - Components of Income Tax Provision   HTML     50K 
                (Details)                                                        
82: R70         Income Taxes - Income Tax Rate Reconciliation       HTML     60K 
                (Details)                                                        
83: R71         Income Taxes - Components of Deferred Tax Assets    HTML     75K 
                and Liabilities (Details)                                        
84: R72         Income Taxes - Unrecognized Tax Benefits Activity   HTML     36K 
                (Details)                                                        
85: R73         Income Taxes - Textual (Details)                    HTML     60K 
86: R74         Segment Information - Revenue by Geographic Region  HTML     46K 
                (Details)                                                        
87: R75         Segment Information - Property and Equipment by     HTML     34K 
                Geographic Region (Details)                                      
88: R76         Quarterly Financial Data - Unaudited (Details)      HTML     47K 
89: R77         Schedule II. Valuation and Qualifying Accounts      HTML     39K 
                (Details)                                                        
91: XML         IDEA XML File -- Filing Summary                      XML    166K 
90: EXCEL       IDEA Workbook of Financial Reports                  XLSX    114K 
 7: EX-101.INS  XBRL Instance -- calx-20151231                       XML   2.88M 
 9: EX-101.CAL  XBRL Calculations -- calx-20151231_cal               XML    273K 
10: EX-101.DEF  XBRL Definitions -- calx-20151231_def                XML    658K 
11: EX-101.LAB  XBRL Labels -- calx-20151231_lab                     XML   1.95M 
12: EX-101.PRE  XBRL Presentations -- calx-20151231_pre              XML   1.10M 
 8: EX-101.SCH  XBRL Schema -- calx-20151231                         XSD    170K 
92: ZIP         XBRL Zipped Folder -- 0001406666-16-000041-xbrl      Zip    285K

‘EX-101.LAB’   —   XBRL Labels — calx-20151231_lab

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<link:label id="lab_us-gaap_BusinessAcquisitionAxis_D70BCE731CADB71E1B22664074856272_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_D70BCE731CADB71E1B22664074856272" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Axis] </link:label>
<link:label id="lab_us-gaap_BusinessAcquisitionAxis_D70BCE731CADB71E1B22664074856272_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_D70BCE731CADB71E1B22664074856272" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Axis] </link:label>
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<link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E62550B82678BA711B22664074850D1D_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E62550B82678BA711B22664074850D1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Acquiree [Domain] </link:label>
<link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E62550B82678BA711B22664074850D1D_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E62550B82678BA711B22664074850D1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Acquiree [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E62550B82678BA711B22664074850D1D" xlink:type="locator"/>
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<link:label id="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F_terseLabel_en-US" xlink:label="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Occam Acquisition </link:label>
<link:label id="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F_label_en-US" xlink:label="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Occam Acquisition [Member] </link:label>
<link:label id="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F_documentation_en-US" xlink:label="lab_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Occam Acquisition [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_OccamAcquisitionMember" xlink:label="loc_calx_OccamAcquisitionMember_D76160777EC69E86762C66407485B42F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Litigation Case [Axis] </link:label>
<link:label id="lab_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA_label_en-US" xlink:label="lab_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Litigation Case [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA" xlink:to="lab_us-gaap_LitigationCaseAxis_6586AE9E0DF49C9705066640748527EA" xlink:type="arc"/>
<link:label id="lab_us-gaap_LitigationCaseTypeDomain_1658FC23678423292EC966407485728E_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationCaseTypeDomain_1658FC23678423292EC966407485728E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Litigation Case [Domain] </link:label>
<link:label id="lab_us-gaap_LitigationCaseTypeDomain_1658FC23678423292EC966407485728E_label_en-US" xlink:label="lab_us-gaap_LitigationCaseTypeDomain_1658FC23678423292EC966407485728E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Litigation Case [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_1658FC23678423292EC966407485728E" xlink:type="locator"/>
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<link:label id="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E_terseLabel_en-US" xlink:label="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Occam shareholders vs Occam and Occam Board Of Directors </link:label>
<link:label id="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E_label_en-US" xlink:label="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Occam Shareholders Versus Occam and Occam Board of Directors [Member] </link:label>
<link:label id="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E_documentation_en-US" xlink:label="lab_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Occam Shareholders Versus Occam and Occam Board of Directors [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember" xlink:label="loc_calx_OccamShareholdersVersusOccamandOccamBoardofDirectorsMember_2E0E548BDEFB288726CA66407485429E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseArrangementTypeAxis_9C6EF5FA4B6A22A7C80B66407485316D_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_9C6EF5FA4B6A22A7C80B66407485316D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Arrangement, Type [Axis] </link:label>
<link:label id="lab_us-gaap_LeaseArrangementTypeAxis_9C6EF5FA4B6A22A7C80B66407485316D_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_9C6EF5FA4B6A22A7C80B66407485316D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease Arrangement, Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeaseArrangementTypeAxis" xlink:label="loc_us-gaap_LeaseArrangementTypeAxis_9C6EF5FA4B6A22A7C80B66407485316D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseArrangementTypeDomain_0BD225437157F37D981E664074860053_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_0BD225437157F37D981E664074860053" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Arrangement, Type [Domain] </link:label>
<link:label id="lab_us-gaap_LeaseArrangementTypeDomain_0BD225437157F37D981E664074860053_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_0BD225437157F37D981E664074860053" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease Arrangement, Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeaseArrangementTypeDomain" xlink:label="loc_us-gaap_LeaseArrangementTypeDomain_0BD225437157F37D981E664074860053" xlink:type="locator"/>
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<link:label id="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F_terseLabel_en-US" xlink:label="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Petaluma Lease </link:label>
<link:label id="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F_label_en-US" xlink:label="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Petaluma Lease [Member] </link:label>
<link:label id="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F_documentation_en-US" xlink:label="lab_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Petaluma Lease [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_PetalumaLeaseMember" xlink:label="loc_calx_PetalumaLeaseMember_05E7AAEA885A7B229D6866407486029F" xlink:type="locator"/>
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<link:label id="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753_terseLabel_en-US" xlink:label="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amendment to Petaluma Lease </link:label>
<link:label id="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753_label_en-US" xlink:label="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amendment to Petaluma Lease [Member] </link:label>
<link:label id="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753_documentation_en-US" xlink:label="lab_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amendment to Petaluma Lease [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AmendmenttoPetalumaLeaseMember" xlink:label="loc_calx_AmendmenttoPetalumaLeaseMember_73B4F6644F2B003E803266407486E753" xlink:type="locator"/>
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<link:label id="lab_us-gaap_BalanceSheetLocationAxis_B0A108DE7C74F0280D2366407486C7A6_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_B0A108DE7C74F0280D2366407486C7A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Balance Sheet Location [Axis] </link:label>
<link:label id="lab_us-gaap_BalanceSheetLocationAxis_B0A108DE7C74F0280D2366407486C7A6_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_B0A108DE7C74F0280D2366407486C7A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Balance Sheet Location [Axis] </link:label>
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<link:label id="lab_us-gaap_BalanceSheetLocationDomain_D6467D5B6772A860695866407486DCA0_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_D6467D5B6772A860695866407486DCA0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Balance Sheet Location [Domain] </link:label>
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<link:label id="lab_us-gaap_AccruedLiabilitiesMember_4FAF9DE1D20296865F3D66407486573F_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesMember_4FAF9DE1D20296865F3D66407486573F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities </link:label>
<link:label id="lab_us-gaap_AccruedLiabilitiesMember_4FAF9DE1D20296865F3D66407486573F_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesMember_4FAF9DE1D20296865F3D66407486573F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities [Member] </link:label>
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<link:label id="lab_us-gaap_OtherNoncurrentLiabilitiesMember_23450DD7B4818BAAFE7866407486F468_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncurrentLiabilitiesMember_23450DD7B4818BAAFE7866407486F468" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Long-term Liabilities </link:label>
<link:label id="lab_us-gaap_OtherNoncurrentLiabilitiesMember_23450DD7B4818BAAFE7866407486F468_label_en-US" xlink:label="lab_us-gaap_OtherNoncurrentLiabilitiesMember_23450DD7B4818BAAFE7866407486F468" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Noncurrent Liabilities [Member] </link:label>
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<link:label id="lab_us-gaap_RangeAxis_66D7AF6E18BE4F3A0DD86640748688E7_terseLabel_en-US" xlink:label="lab_us-gaap_RangeAxis_66D7AF6E18BE4F3A0DD86640748688E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range [Axis] </link:label>
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<link:label id="lab_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65_terseLabel_en-US" xlink:label="lab_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range [Domain] </link:label>
<link:label id="lab_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65_label_en-US" xlink:label="lab_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Range [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65" xlink:to="lab_us-gaap_RangeMember_DD6456ECFBC7541528A1664074867A65" xlink:type="arc"/>
<link:label id="lab_us-gaap_MinimumMember_DEE0A60D1F9261F759B2664074869083_terseLabel_en-US" xlink:label="lab_us-gaap_MinimumMember_DEE0A60D1F9261F759B2664074869083" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum </link:label>
<link:label id="lab_us-gaap_MinimumMember_DEE0A60D1F9261F759B2664074869083_label_en-US" xlink:label="lab_us-gaap_MinimumMember_DEE0A60D1F9261F759B2664074869083" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_DEE0A60D1F9261F759B2664074869083" xlink:type="locator"/>
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<link:label id="lab_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51_terseLabel_en-US" xlink:label="lab_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum </link:label>
<link:label id="lab_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51_label_en-US" xlink:label="lab_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51" xlink:to="lab_us-gaap_MaximumMember_0D1BA37385CA538F206F66407486EF51" xlink:type="arc"/>
<link:label id="lab_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Line Items] </link:label>
<link:label id="lab_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F" xlink:to="lab_us-gaap_LossContingenciesLineItems_3BB395199528883174A3664074865F0F" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7_terseLabel_en-US" xlink:label="lab_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Commitments </link:label>
<link:label id="lab_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leases [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7" xlink:to="lab_us-gaap_LeasesAbstract_0774F09F384BACBF53796640748754B7" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96_terseLabel_en-US" xlink:label="lab_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Incentive Received </link:label>
<link:label id="lab_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96_label_en-US" xlink:label="lab_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Incentive from Lessor </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncentiveFromLessor" xlink:label="loc_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96" xlink:to="lab_us-gaap_IncentiveFromLessor_F6D74351DEA57C1194B366407487EF96" xlink:type="arc"/>
<link:label id="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174_terseLabel_en-US" xlink:label="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized Lease Incentive </link:label>
<link:label id="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174_label_en-US" xlink:label="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unamortized lease incentive </link:label>
<link:label id="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174_documentation_en-US" xlink:label="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Unamortized lease incentive </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_UnamortizedLeaseIncentive" xlink:label="loc_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:to="lab_calx_UnamortizedLeaseIncentive_AD72AB9C0879814A2638664074875174" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseAndRentalExpense_94DF5D12134C73DE3A03664074877565_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_94DF5D12134C73DE3A03664074877565" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Rent Expense </link:label>
<link:label id="lab_us-gaap_LeaseAndRentalExpense_94DF5D12134C73DE3A03664074877565_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_94DF5D12134C73DE3A03664074877565" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Rent Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_94DF5D12134C73DE3A03664074877565" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_2A93E8743CC124E39FDF66407487C54E_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_2A93E8743CC124E39FDF66407487C54E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchase Commitments </link:label>
<link:label id="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_2A93E8743CC124E39FDF66407487C54E_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_2A93E8743CC124E39FDF66407487C54E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Commitment, Fiscal Year Maturity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherCommitmentFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_2A93E8743CC124E39FDF66407487C54E" xlink:type="locator"/>
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<link:label id="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8_verboseLabel_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued excess and obsolete inventory at contract manufacturers </link:label>
<link:label id="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8_label_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Excess and Obsolete Inventory At Contract Manufacturer </link:label>
<link:label id="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8_documentation_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued excess and obsolete inventory at contract manufacturer. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer" xlink:label="loc_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_FAF0D5126942507BE59666407487C1D8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_13CFE46C9211D329CDA2664074877307_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_13CFE46C9211D329CDA2664074877307" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-cancelable outstanding purchase orders </link:label>
<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_13CFE46C9211D329CDA2664074877307_label_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_13CFE46C9211D329CDA2664074877307" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Purchase Commitment, Remaining Minimum Amount Committed </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted" xlink:label="loc_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_13CFE46C9211D329CDA2664074877307" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StandardProductWarrantyDisclosureAbstract_C5FCC608AB1A01E097676640748799DE_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyDisclosureAbstract_C5FCC608AB1A01E097676640748799DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued Warranty </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyDisclosureAbstract_C5FCC608AB1A01E097676640748799DE_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyDisclosureAbstract_C5FCC608AB1A01E097676640748799DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StandardProductWarrantyDisclosureAbstract" xlink:label="loc_us-gaap_StandardProductWarrantyDisclosureAbstract_C5FCC608AB1A01E097676640748799DE" xlink:type="locator"/>
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<link:label id="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48_terseLabel_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product warranty period </link:label>
<link:label id="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48_label_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Period </link:label>
<link:label id="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48_documentation_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Represents the general warranty period for the Company's hardware products from the date of shipment. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ProductWarrantyPeriod" xlink:label="loc_calx_ProductWarrantyPeriod_A39DFB21D0E931DEC4A2664074874B48" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LossContingencyInformationAboutLitigationMattersAbstract_8D0FA371203FE89DC78366407487C4F2_verboseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyInformationAboutLitigationMattersAbstract_8D0FA371203FE89DC78366407487C4F2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Litigation </link:label>
<link:label id="lab_us-gaap_LossContingencyInformationAboutLitigationMattersAbstract_8D0FA371203FE89DC78366407487C4F2_label_en-US" xlink:label="lab_us-gaap_LossContingencyInformationAboutLitigationMattersAbstract_8D0FA371203FE89DC78366407487C4F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Loss Contingency, Information about Litigation Matters [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LossContingencyInformationAboutLitigationMattersAbstract" xlink:label="loc_us-gaap_LossContingencyInformationAboutLitigationMattersAbstract_8D0FA371203FE89DC78366407487C4F2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TradingSecuritiesRealizedGain_556240C20F497EF446EA664074873F18_verboseLabel_en-US" xlink:label="lab_us-gaap_TradingSecuritiesRealizedGain_556240C20F497EF446EA664074873F18" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Trading profits </link:label>
<link:label id="lab_us-gaap_TradingSecuritiesRealizedGain_556240C20F497EF446EA664074873F18_label_en-US" xlink:label="lab_us-gaap_TradingSecuritiesRealizedGain_556240C20F497EF446EA664074873F18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trading Securities, Realized Gain </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TradingSecuritiesRealizedGain" xlink:label="loc_us-gaap_TradingSecuritiesRealizedGain_556240C20F497EF446EA664074873F18" xlink:type="locator"/>
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<link:label id="lab_calx_SharePriceEstimatedInExcessOfMergerConsideration_EFDC198239C21DAB23A166407488E1BE_terseLabel_en-US" xlink:label="lab_calx_SharePriceEstimatedInExcessOfMergerConsideration_EFDC198239C21DAB23A166407488E1BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair value of Occam's common stock on the Effective Date </link:label>
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<link:label id="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_6AB57618042A7A45DBA1DEBE8ED1947F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_6AB57618042A7A45DBA1DEBE8ED1947F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue by Geographic Region </link:label>
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<link:label id="lab_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_DD3F4FD71694D703234FDEBE8ED159F3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_DD3F4FD71694D703234FDEBE8ED159F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and Equipment by Geographic Region </link:label>
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<link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_812537BE2A6371EDD3EEDEBE8D80D3CE_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract_812537BE2A6371EDD3EEDEBE8D80D3CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note [Abstract] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_2B74C86DB40BE1232CC1DEBE8D80A344_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_2B74C86DB40BE1232CC1DEBE8D80A344" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Stock Options Activity </link:label>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_2B74C86DB40BE1232CC1DEBE8D80A344_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_2B74C86DB40BE1232CC1DEBE8D80A344" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_D3A47C14259248065A6BDEBE8D808246_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_D3A47C14259248065A6BDEBE8D808246" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Restricted Stock and Restricted Stock Units Activity </link:label>
<link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_D3A47C14259248065A6BDEBE8D808246_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_D3A47C14259248065A6BDEBE8D808246" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_D3A47C14259248065A6BDEBE8D808246" xlink:type="locator"/>
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<link:label id="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE_terseLabel_en-US" xlink:label="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Grant Date Fair Values </link:label>
<link:label id="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE_label_en-US" xlink:label="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Grant Date Fair Values [Table Text Block] </link:label>
<link:label id="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE_documentation_en-US" xlink:label="lab_calx_ScheduleOfGrantDateFairValuesTableTextBlock_373BF85FACCD11F6E765DEBE8D80EAAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Schedule of Grant Date Fair Values [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_1D990DD35E563057BD54DEBE8D80ACD8_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_1D990DD35E563057BD54DEBE8D80ACD8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Valuation Assumptions, Stock Options </link:label>
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<link:label id="lab_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock_A0DB3D668799D93FBFDADEBE8D800B2F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock_A0DB3D668799D93FBFDADEBE8D800B2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Unrecognized Compensation Cost </link:label>
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<link:label id="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_C60F5E394BA8B14F9B58DEBE8D801A64_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_C60F5E394BA8B14F9B58DEBE8D801A64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Warrants </link:label>
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<link:label id="lab_calx_SharesReservedForFutureIssuanceTableTextBlock_DE2EBBCF00F53969534BDEBE8D808466_terseLabel_en-US" xlink:label="lab_calx_SharesReservedForFutureIssuanceTableTextBlock_DE2EBBCF00F53969534BDEBE8D808466" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares Reserved For Future Issuance </link:label>
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<link:label id="lab_us-gaap_StateAndLocalJurisdictionMember_9C83987C3487768679F4C865AC48F0DB_label_en-US" xlink:label="lab_us-gaap_StateAndLocalJurisdictionMember_9C83987C3487768679F4C865AC48F0DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> State and Local Jurisdiction [Member] </link:label>
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<link:label id="lab_calx_CaliforniaStateMember_CE8748A2BB94AE77E089C865AC48DEE0_terseLabel_en-US" xlink:label="lab_calx_CaliforniaStateMember_CE8748A2BB94AE77E089C865AC48DEE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> California State </link:label>
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<link:label id="lab_calx_OtherStateMember_3CFEE5B7F96707AE4B29C865AC48B976_terseLabel_en-US" xlink:label="lab_calx_OtherStateMember_3CFEE5B7F96707AE4B29C865AC48B976" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other State </link:label>
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<link:label id="lab_calx_IncomeTaxesLineItems_A341051E097DB66AC46AC865AC48AF6C_terseLabel_en-US" xlink:label="lab_calx_IncomeTaxesLineItems_A341051E097DB66AC46AC865AC48AF6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes [Line Items] </link:label>
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<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_6F6D1BDD2B386694C35DC8A0F3264305_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_6F6D1BDD2B386694C35DC8A0F3264305" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net deferred tax assets </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_6F6D1BDD2B386694C35DC8A0F3264305_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_6F6D1BDD2B386694C35DC8A0F3264305" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net </link:label>
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<link:label id="lab_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_7903054B6D335E8068E9C865AC482EBE_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_7903054B6D335E8068E9C865AC482EBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (decrease) In valuation allowance </link:label>
<link:label id="lab_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_7903054B6D335E8068E9C865AC482EBE_label_en-US" xlink:label="lab_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_7903054B6D335E8068E9C865AC482EBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount </link:label>
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<link:label id="lab_calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance_E4091311FBED76ECEAAAC865AC489EB2_terseLabel_en-US" xlink:label="lab_calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance_E4091311FBED76ECEAAAC865AC489EB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Excess tax benefits of stock option deductions included in valuation allowance </link:label>
<link:label id="lab_calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance_E4091311FBED76ECEAAAC865AC489EB2_label_en-US" xlink:label="lab_calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance_E4091311FBED76ECEAAAC865AC489EB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Excess Tax Benefits Of Stock Option Deductions Included In Valuation Allowance </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance" xlink:label="loc_calx_ExcessTaxBenefitsOfStockOptionDeductionsIncludedInValuationAllowance_E4091311FBED76ECEAAAC865AC489EB2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLossCarryforwards_0237BF309BE8370C5AB4C865AC484970_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLossCarryforwards_0237BF309BE8370C5AB4C865AC484970" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating loss carryforward </link:label>
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<link:label id="lab_us-gaap_TaxCreditCarryforwardAmount_3C8ACABFC391DECD8F5FC865AC49F4CB_label_en-US" xlink:label="lab_us-gaap_TaxCreditCarryforwardAmount_3C8ACABFC391DECD8F5FC865AC49F4CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Tax Credit Carryforward, Amount </link:label>
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<link:label id="lab_us-gaap_IncomeStatementAbstract_F1A733E0076D048F5C81AD6D207B2353_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_F1A733E0076D048F5C81AD6D207B2353" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_F1A733E0076D048F5C81AD6D207B2353" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementAbstract_F1A733E0076D048F5C81AD6D207B2353" xlink:to="lab_us-gaap_IncomeStatementAbstract_F1A733E0076D048F5C81AD6D207B2353" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
<link:label id="lab_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB_label_en-US" xlink:label="lab_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB" xlink:to="lab_us-gaap_StatementTable_1B3E580C633AA07AE24DAD6D207B56EB" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>
<link:label id="lab_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401" xlink:to="lab_us-gaap_IncomeStatementLocationAxis_5422C5C972FD8A941BD3AD6D207BC401" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>
<link:label id="lab_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5" xlink:to="lab_us-gaap_IncomeStatementLocationDomain_20782DF93CECFE00CCF9AD6D207B59B5" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of revenue </link:label>
<link:label id="lab_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E_label_en-US" xlink:label="lab_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Sales [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E" xlink:to="lab_us-gaap_CostOfSalesMember_2449F6562A9BC4623163AD6D207BF46E" xlink:type="arc"/>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Research and development </link:label>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research and Development Expense [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpenseMember_0EBCC105B96115593C6BAD6D207BAD8F" xlink:type="arc"/>
<link:label id="lab_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896_terseLabel_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sales and marketing </link:label>
<link:label id="lab_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896_label_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling and Marketing Expense [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896" xlink:to="lab_us-gaap_SellingAndMarketingExpenseMember_898204CC3BB113B707AEAD6D207B9896" xlink:type="arc"/>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> General and administrative </link:label>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General and Administrative Expense [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpenseMember_D16B18DDEE659E4D6AD2AD6D207BC3F8" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
<link:label id="lab_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960" xlink:to="lab_us-gaap_StatementLineItems_71E304175AF4E46C4B49AD6D207BD960" xlink:type="arc"/>
<link:label id="lab_us-gaap_Revenues_6F376427ED7B400A3D3FAD6D207BE727_verboseLabel_en-US" xlink:label="lab_us-gaap_Revenues_6F376427ED7B400A3D3FAD6D207BE727" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_6F376427ED7B400A3D3FAD6D207BE727" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_6F376427ED7B400A3D3FAD6D207BE727" xlink:to="lab_us-gaap_Revenues_6F376427ED7B400A3D3FAD6D207BE727" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfRevenueAbstract_E0828D8263F7962D36CFAD6D207B0E38_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfRevenueAbstract_E0828D8263F7962D36CFAD6D207B0E38" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cost of revenue: </link:label>
<link:label id="lab_us-gaap_CostOfRevenueAbstract_E0828D8263F7962D36CFAD6D207B0E38_label_en-US" xlink:label="lab_us-gaap_CostOfRevenueAbstract_E0828D8263F7962D36CFAD6D207B0E38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Revenue [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_E0828D8263F7962D36CFAD6D207B0E38" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_272124E6A87CD39380E3AD6D207B0F33_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_272124E6A87CD39380E3AD6D207B0F33" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Products and services </link:label>
<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_272124E6A87CD39380E3AD6D207B0F33_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_272124E6A87CD39380E3AD6D207B0F33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods and Services Sold </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_272124E6A87CD39380E3AD6D207B0F33" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CostOfGoodsSoldAmortization_FFE8D4C6032098497899AD6D207BDBF7_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsSoldAmortization_FFE8D4C6032098497899AD6D207BDBF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of intangible assets </link:label>
<link:label id="lab_us-gaap_CostOfGoodsSoldAmortization_FFE8D4C6032098497899AD6D207BDBF7_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsSoldAmortization_FFE8D4C6032098497899AD6D207BDBF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods Sold, Amortization </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfGoodsSoldAmortization" xlink:label="loc_us-gaap_CostOfGoodsSoldAmortization_FFE8D4C6032098497899AD6D207BDBF7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CostOfRevenue_C02DD579DC58C3FCB85BAD6D207CDB96_totalLabel_en-US" xlink:label="lab_us-gaap_CostOfRevenue_C02DD579DC58C3FCB85BAD6D207CDB96" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total cost of revenue </link:label>
<link:label id="lab_us-gaap_CostOfRevenue_C02DD579DC58C3FCB85BAD6D207CDB96_label_en-US" xlink:label="lab_us-gaap_CostOfRevenue_C02DD579DC58C3FCB85BAD6D207CDB96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_C02DD579DC58C3FCB85BAD6D207CDB96" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GrossProfit_D4262F3DC4030251631DAD6D207C7136_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_D4262F3DC4030251631DAD6D207C7136" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_D4262F3DC4030251631DAD6D207C7136" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingExpensesAbstract_EF0D9DFC20B4FC53DCE2AD6D207C48DE_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_EF0D9DFC20B4FC53DCE2AD6D207C48DE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Operating expenses: </link:label>
<link:label id="lab_us-gaap_OperatingExpensesAbstract_EF0D9DFC20B4FC53DCE2AD6D207C48DE_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_EF0D9DFC20B4FC53DCE2AD6D207C48DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_EF0D9DFC20B4FC53DCE2AD6D207C48DE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8_verboseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Research and development </link:label>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research and Development Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpense_1326C4103227D938F690AD6D207CC3B8" xlink:type="arc"/>
<link:label id="lab_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373_verboseLabel_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Sales and marketing </link:label>
<link:label id="lab_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373_label_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling and Marketing Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373" xlink:to="lab_us-gaap_SellingAndMarketingExpense_99846478AFDCF801A72CAD6D207CC373" xlink:type="arc"/>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> General and administrative </link:label>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General and Administrative Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense_E902955A51F1114A7C7DAD6D207C4A24" xlink:type="arc"/>
<link:label id="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1_verboseLabel_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of intangible assets </link:label>
<link:label id="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1_label_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses Amortization </link:label>
<link:label id="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1_documentation_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of expense recognized in the current period in the operating expenses that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element excludes the intangible assets used in the production of goods. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_OperatingExpensesAmortization" xlink:label="loc_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:to="lab_calx_OperatingExpensesAmortization_2C1597DA0DB613EB76B8AD6D207CADE1" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating expenses </link:label>
<link:label id="lab_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1_label_en-US" xlink:label="lab_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1" xlink:to="lab_us-gaap_OperatingExpenses_662874A76E7130CAA6E2AD6D207C86A1" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingIncomeLoss_EDDF57867A296BA9EC83AD6D207CB686_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_EDDF57867A296BA9EC83AD6D207CB686" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Loss from operations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_EDDF57867A296BA9EC83AD6D207CB686" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_EDDF57867A296BA9EC83AD6D207CB686" xlink:to="lab_us-gaap_OperatingIncomeLoss_EDDF57867A296BA9EC83AD6D207CB686" xlink:type="arc"/>
<link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937_verboseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Interest and other income (expense), net: </link:label>
<link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nonoperating Income (Expense) [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937" xlink:to="lab_us-gaap_NonoperatingIncomeExpenseAbstract_84F7ABB6BF48CBB8C115AD6D207C6937" xlink:type="arc"/>
<link:label id="lab_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Interest income </link:label>
<link:label id="lab_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment Income, Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39" xlink:to="lab_us-gaap_InvestmentIncomeInterest_D9462FDB8FB3B39D409CAD6D207CDD39" xlink:type="arc"/>
<link:label id="lab_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0_negatedLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Interest expense </link:label>
<link:label id="lab_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0_label_en-US" xlink:label="lab_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0" xlink:to="lab_us-gaap_InterestExpense_59ED608FCDC5C60CEF71AD6D207C26F0" xlink:type="arc"/>
<link:label id="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706_terseLabel_en-US" xlink:label="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Utilization of inventory credit </link:label>
<link:label id="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706_label_en-US" xlink:label="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Utilization Of Inventory Credit </link:label>
<link:label id="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706_documentation_en-US" xlink:label="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other income from utilization of inventory credit </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_UtilizationOfInventoryCredit" xlink:label="loc_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:to="lab_calx_UtilizationOfInventoryCredit_958A7D264B5395598FE6AD6D207C6706" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other income (expense), net </link:label>
<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C_label_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Nonoperating Income (Expense) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C" xlink:to="lab_us-gaap_OtherNonoperatingIncomeExpense_B18335D224088D07C187AD6D207CF99C" xlink:type="arc"/>
<link:label id="lab_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8_totalLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total interest and other income (expense), net </link:label>
<link:label id="lab_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nonoperating Income (Expense) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8" xlink:to="lab_us-gaap_NonoperatingIncomeExpense_F804E6CB057873140B7AAD6D207CD7B8" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0B52D82C7E380E09A8EAAD6D207C3F1F_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0B52D82C7E380E09A8EAAD6D207C3F1F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Loss before provision for (benefit from) income taxes </link:label>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0B52D82C7E380E09A8EAAD6D207C3F1F_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0B52D82C7E380E09A8EAAD6D207C3F1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0B52D82C7E380E09A8EAAD6D207C3F1F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProfitLoss_17894123A92D916966D5AD6D207C6269_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_17894123A92D916966D5AD6D207C6269" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_17894123A92D916966D5AD6D207C6269" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_17894123A92D916966D5AD6D207C6269" xlink:to="lab_us-gaap_ProfitLoss_17894123A92D916966D5AD6D207C6269" xlink:type="arc"/>
<link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Net loss per common share: </link:label>
<link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share, Basic [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC" xlink:to="lab_us-gaap_EarningsPerShareBasicAbstract_B5B5DDF203B1AAC8262DAD6D207D8CEC" xlink:type="arc"/>
<link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_9B542EB8F7538EB0D55AAD6D207D28FB_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_9B542EB8F7538EB0D55AAD6D207D28FB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Basic and diluted (in dollars per share) </link:label>
<link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_9B542EB8F7538EB0D55AAD6D207D28FB_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_9B542EB8F7538EB0D55AAD6D207D28FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share, Basic and Diluted </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_9B542EB8F7538EB0D55AAD6D207D28FB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_D426D01290BDC2F955AEAD6D207DDA8F_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_D426D01290BDC2F955AEAD6D207DDA8F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average number of shares used to compute net loss per common share: </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_CA5299E6195E89FBFF69DEBE8E19AB31_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_CA5299E6195E89FBFF69DEBE8E19AB31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Options, Weighted-Average Exercise Price Per Share: </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_4D6AF58764A2A71595EDDEBE8E197EE9_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_4D6AF58764A2A71595EDDEBE8E197EE9" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Stock options outstanding, beginning (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_02297D6FF264D05F804ADEBE8E1A0D88_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_02297D6FF264D05F804ADEBE8E1A0D88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock options granted (in dollars per share) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C545E91E64676A445EB1DEBE8E1A108F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_5A265B4373ED1FB2A096DEBE8E1A72D7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_5A265B4373ED1FB2A096DEBE8E1A72D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock options forfeited (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_EA4DB28B834626E8C2F3DEBE8E1A1F7C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_EA4DB28B834626E8C2F3DEBE8E1A1F7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock options vested and expected to vest (in dollars per share) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_DC16610C71881097A956DEBE8E1A92C6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_999C7A5F9CE25F7E0398DEBE8E1A4363_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_999C7A5F9CE25F7E0398DEBE8E1A4363" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining contractual term, stock options outstanding </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_999C7A5F9CE25F7E0398DEBE8E1A4363_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_999C7A5F9CE25F7E0398DEBE8E1A4363" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_999C7A5F9CE25F7E0398DEBE8E1A4363" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_E57E3F51465F4D3EF4D8DEBE8E1A81B6_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_E57E3F51465F4D3EF4D8DEBE8E1A81B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining contractual term, stock options vested and expected to vest </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_E57E3F51465F4D3EF4D8DEBE8E1A81B6_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_E57E3F51465F4D3EF4D8DEBE8E1A81B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_E57E3F51465F4D3EF4D8DEBE8E1A81B6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining contractual term, stock options exercisable </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_5C0AD619CFB8D04E4D84DEBE8E1AEF9C" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate intrinsic value, stock options outstanding </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BD92D520BDFFFEAFC4D7DEBE8E1A0156" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_2D4028CCCE13026FFE29DEBE8E1A1B4B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_2D4028CCCE13026FFE29DEBE8E1A1B4B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate intrinsic value, stock options vested and expected to vest </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_2D4028CCCE13026FFE29DEBE8E1A1B4B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_2D4028CCCE13026FFE29DEBE8E1A1B4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_2D4028CCCE13026FFE29DEBE8E1A1B4B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate intrinsic value, stock options exercisable </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A156B90F5D7AC03A709DEBE8E1AABE7" xlink:type="arc"/>
<link:label id="lab_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014_label_en-US" xlink:label="lab_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document and Entity Information [Abstract] </link:label>
<link:label id="lab_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014_documentation_en-US" xlink:label="lab_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Document and entity information. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_DocumentAndEntityInformationAbstract" xlink:label="loc_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014" xlink:to="lab_calx_DocumentAndEntityInformationAbstract_4E68B6851A6B6766D390DEBE8EB82014" xlink:type="arc"/>
<link:label id="lab_dei_EntityRegistrantName_DE6B38B2B177E44C0231DEBE8EB8229E_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_DE6B38B2B177E44C0231DEBE8EB8229E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:label id="lab_dei_EntityRegistrantName_DE6B38B2B177E44C0231DEBE8EB8229E_label_en-US" xlink:label="lab_dei_EntityRegistrantName_DE6B38B2B177E44C0231DEBE8EB8229E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_DE6B38B2B177E44C0231DEBE8EB8229E" xlink:type="locator"/>
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<link:label id="lab_dei_EntityCentralIndexKey_639D8436A02F81C31C49DEBE8EB86926_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_639D8436A02F81C31C49DEBE8EB86926" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:label id="lab_dei_EntityCentralIndexKey_639D8436A02F81C31C49DEBE8EB86926_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey_639D8436A02F81C31C49DEBE8EB86926" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_639D8436A02F81C31C49DEBE8EB86926" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentType_25FAE5A0DF0F16B221FBDEBE8EB8739C_terseLabel_en-US" xlink:label="lab_dei_DocumentType_25FAE5A0DF0F16B221FBDEBE8EB8739C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:label id="lab_dei_DocumentType_25FAE5A0DF0F16B221FBDEBE8EB8739C_label_en-US" xlink:label="lab_dei_DocumentType_25FAE5A0DF0F16B221FBDEBE8EB8739C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_25FAE5A0DF0F16B221FBDEBE8EB8739C" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentPeriodEndDate_56BD87911052251BEC07DEBE8EB87DC9_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_56BD87911052251BEC07DEBE8EB87DC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_56BD87911052251BEC07DEBE8EB87DC9" xlink:type="locator"/>
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<link:label id="lab_dei_AmendmentFlag_CD9D138778CC782ECA4BDEBE8EB83550_label_en-US" xlink:label="lab_dei_AmendmentFlag_CD9D138778CC782ECA4BDEBE8EB83550" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amendment Flag </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_CD9D138778CC782ECA4BDEBE8EB83550" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentFiscalYearFocus_50C756BE81CCAD4C8479DEBE8EB87100_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_50C756BE81CCAD4C8479DEBE8EB87100" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Fiscal Year Focus </link:label>
<link:label id="lab_dei_DocumentFiscalYearFocus_50C756BE81CCAD4C8479DEBE8EB87100_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_50C756BE81CCAD4C8479DEBE8EB87100" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Fiscal Year Focus </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_50C756BE81CCAD4C8479DEBE8EB87100" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_C9C052F00676F8FB429BDEBE8EB80233" xlink:type="locator"/>
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<link:label id="lab_dei_CurrentFiscalYearEndDate_42CD2F2F59EEA720EC42DEBE8EB88165_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_42CD2F2F59EEA720EC42DEBE8EB88165" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current Fiscal Year End Date </link:label>
<link:label id="lab_dei_CurrentFiscalYearEndDate_42CD2F2F59EEA720EC42DEBE8EB88165_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_42CD2F2F59EEA720EC42DEBE8EB88165" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Fiscal Year End Date </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_42CD2F2F59EEA720EC42DEBE8EB88165" xlink:type="locator"/>
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<link:label id="lab_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:label id="lab_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E_label_en-US" xlink:label="lab_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E" xlink:to="lab_dei_EntityFilerCategory_7DC2F8F0B494B64A3034DEBE8EB90A4E" xlink:type="arc"/>
<link:label id="lab_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
<link:label id="lab_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751" xlink:to="lab_dei_EntityCurrentReportingStatus_F2A5A987075CEE8C12C2DEBE8EB93751" xlink:type="arc"/>
<link:label id="lab_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2_terseLabel_en-US" xlink:label="lab_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Voluntary Filers </link:label>
<link:label id="lab_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2_label_en-US" xlink:label="lab_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Voluntary Filers </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2" xlink:to="lab_dei_EntityVoluntaryFilers_3C0906525B91E0A91079DEBE8EB917E2" xlink:type="arc"/>
<link:label id="lab_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Well-known Seasoned Issuer </link:label>
<link:label id="lab_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579_label_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Well-known Seasoned Issuer </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579" xlink:to="lab_dei_EntityWellKnownSeasonedIssuer_F4A714A956293915F1C0DEBE8EB93579" xlink:type="arc"/>
<link:label id="lab_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>
<link:label id="lab_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C_label_en-US" xlink:label="lab_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C" xlink:to="lab_dei_TradingSymbol_7B62AE048B7AD818F9FBDEBE8EB90D0C" xlink:type="arc"/>
<link:label id="lab_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>
<link:label id="lab_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670" xlink:to="lab_dei_EntityCommonStockSharesOutstanding_C6FCA84F80A5469365A3DEBE8EB93670" xlink:type="arc"/>
<link:label id="lab_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF_terseLabel_en-US" xlink:label="lab_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>
<link:label id="lab_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF_label_en-US" xlink:label="lab_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF" xlink:to="lab_dei_EntityPublicFloat_B10452EDB705BD6531B6DEBE8EB98FDF" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2016 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due, Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_671713C804B8A691644C88116951A968" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2017 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Two Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C9B971D7CFF7B30E8D3C88116951A2AB" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2018 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Three Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_BF12ED4285F46CB18F428811695120E0" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_01CA9470D1C3175162CC881169515046_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_01CA9470D1C3175162CC881169515046" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_01CA9470D1C3175162CC881169515046_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_01CA9470D1C3175162CC881169515046" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Four Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_01CA9470D1C3175162CC881169515046" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_BBF4A7697B6BD2BE143C88116951DFBC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_BBF4A7697B6BD2BE143C88116951DFBC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_BBF4A7697B6BD2BE143C88116951DFBC_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_BBF4A7697B6BD2BE143C88116951DFBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Five Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_BBF4A7697B6BD2BE143C88116951DFBC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48483AEA7E3FD1D32AD1881169514F7F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48483AEA7E3FD1D32AD1881169514F7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48483AEA7E3FD1D32AD1881169514F7F_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48483AEA7E3FD1D32AD1881169514F7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due Thereafter </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48483AEA7E3FD1D32AD1881169514F7F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_ECA11FE2C192DDC8538788116951BF86_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_ECA11FE2C192DDC8538788116951BF86" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_ECA11FE2C192DDC8538788116951BF86_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_ECA11FE2C192DDC8538788116951BF86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_ECA11FE2C192DDC8538788116951BF86" xlink:type="locator"/>
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<link:label id="lab_us-gaap_BalanceSheetRelatedDisclosuresAbstract_DF4A974FE9563580FE2A1A0625D8A13D_label_en-US" xlink:label="lab_us-gaap_BalanceSheetRelatedDisclosuresAbstract_DF4A974FE9563580FE2A1A0625D8A13D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Balance Sheet Related Disclosures [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BalanceSheetRelatedDisclosuresAbstract" xlink:label="loc_us-gaap_BalanceSheetRelatedDisclosuresAbstract_DF4A974FE9563580FE2A1A0625D8A13D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of accrued liabilities </link:label>
<link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_44655BE2E178D55E56DF1A0625D8342C" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued compensation and related benefits </link:label>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee-related Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_A377F0614D6972E0C02D1A0625D8FA5D" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F_verboseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued warranty </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Accrual, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F" xlink:to="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_1DA13D5D130FFE9EEE621A0625D8410F" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued professional and consulting fees </link:label>
<link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB_label_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Professional Fees, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="loc_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB" xlink:to="lab_us-gaap_AccruedProfessionalFeesCurrent_9E5E7ACBE6A11C852FC31A0625D874FB" xlink:type="arc"/>
<link:label id="lab_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advance customer payments </link:label>
<link:label id="lab_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer Advances, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CustomerAdvancesCurrent" xlink:label="loc_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33" xlink:to="lab_us-gaap_CustomerAdvancesCurrent_E17738D27AF1C623E52E1A0625D81C33" xlink:type="arc"/>
<link:label id="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81_verboseLabel_en-US" xlink:label="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued non income related taxes </link:label>
<link:label id="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81_label_en-US" xlink:label="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Taxes Payable, Current, Excluding Accrued Income Taxes </link:label>
<link:label id="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81_documentation_en-US" xlink:label="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Taxes Payable, Current, Excluding Accrued Income Taxes </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes" xlink:label="loc_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:to="lab_calx_TaxesPayableCurrentExcludingAccruedIncomeTaxes_0A04E55AEC5BB0E74C401A0625D9DC81" xlink:type="arc"/>
<link:label id="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302_verboseLabel_en-US" xlink:label="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Advance customer payments </link:label>
<link:label id="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302_label_en-US" xlink:label="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Customer Rebates </link:label>
<link:label id="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302_documentation_en-US" xlink:label="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued customer rebates. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AccruedCustomerRebates" xlink:label="loc_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:to="lab_calx_AccruedCustomerRebates_8DF3760B484A874F118F1A0625D94302" xlink:type="arc"/>
<link:label id="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035_verboseLabel_en-US" xlink:label="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued non income related taxes </link:label>
<link:label id="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035_label_en-US" xlink:label="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Business Travel Expenses </link:label>
<link:label id="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035_documentation_en-US" xlink:label="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued business travel expenses. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AccruedBusinessTravelExpenses" xlink:label="loc_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:to="lab_calx_AccruedBusinessTravelExpenses_2BD12136D50D5F415A6E1A0625D9E035" xlink:type="arc"/>
<link:label id="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4_terseLabel_en-US" xlink:label="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued freight </link:label>
<link:label id="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4_label_en-US" xlink:label="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Freight, Current </link:label>
<link:label id="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4_documentation_en-US" xlink:label="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued Freight, current </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AccruedFreightCurrent" xlink:label="loc_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:to="lab_calx_AccruedFreightCurrent_BC1C81BE760B101B520A1A0625D98AA4" xlink:type="arc"/>
<link:label id="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148_terseLabel_en-US" xlink:label="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued hosting services </link:label>
<link:label id="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148_label_en-US" xlink:label="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Hosting Services, Current </link:label>
<link:label id="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148_documentation_en-US" xlink:label="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued Hosting Services </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_AccruedHostingServicesCurrent" xlink:label="loc_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:to="lab_calx_AccruedHostingServicesCurrent_F7A515A6C77C333AA4E01A0625D92148" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued hosting services </link:label>
<link:label id="lab_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA_label_en-US" xlink:label="lab_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Rent, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedRentCurrent" xlink:label="loc_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA" xlink:to="lab_us-gaap_AccruedRentCurrent_F1D3A8AE05727A0BC0FD1A0625D94CDA" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes payable </link:label>
<link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB_label_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Income Taxes, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB" xlink:to="lab_us-gaap_AccruedIncomeTaxesCurrent_E4292828747B2271267B1A0625D9B1EB" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued other </link:label>
<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Accrued Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5" xlink:to="lab_us-gaap_OtherAccruedLiabilitiesCurrent_BF4A34C11FEBA8B1BBA41A0625D99FB5" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56_totalLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total accrued liabilities </link:label>
<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_A47C7C114776D82C74941A0625D9CD56" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warrants Outstanding </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightTable" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F" xlink:to="lab_us-gaap_ClassOfWarrantOrRightTable_F78210604044E756940DDEBE8D58D02F" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Axis] </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA" xlink:to="lab_us-gaap_ClassOfWarrantOrRightAxis_22033C9060A3161FA74DDEBE8D5810FA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Domain] </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C" xlink:to="lab_us-gaap_ClassOfWarrantOrRightDomain_DE6A08FF26D74B609677DEBE8D581C6C" xlink:type="arc"/>
<link:label id="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4_terseLabel_en-US" xlink:label="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Expiration Date of September 4, 2017 </link:label>
<link:label id="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4_label_en-US" xlink:label="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Expiration Date 2 [Member] </link:label>
<link:label id="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4_documentation_en-US" xlink:label="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Expiration Date 2 [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ExpirationDate2Member" xlink:label="loc_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:to="lab_calx_ExpirationDate2Member_9DA9C3E3FA84967C84A9DEBE8D5836D4" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Line Items] </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightLineItems" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0" xlink:to="lab_us-gaap_ClassOfWarrantOrRightLineItems_5ACE34675800AA88C39BDEBE8D58D6A0" xlink:type="arc"/>
<link:label id="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494_terseLabel_en-US" xlink:label="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Expiration date, warrants </link:label>
<link:label id="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494_label_en-US" xlink:label="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Warrants Expiration Date </link:label>
<link:label id="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494_documentation_en-US" xlink:label="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Warrants Expiration Date. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_WarrantsExpirationDate" xlink:label="loc_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:to="lab_calx_WarrantsExpirationDate_85E4BDCA31FD00E2E0E9DEBE8D587494" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price per share, warrants </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right, Exercise Price of Warrants or Rights </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D" xlink:to="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_7B31415EFAC056A0D7B3DEBE8D5EB07D" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of warrants outstanding </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right, Outstanding </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41" xlink:to="lab_us-gaap_ClassOfWarrantOrRightOutstanding_9E05CFE38760A4E5DE2FDEBE8D5ECD41" xlink:type="arc"/>
<link:label id="lab_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of inventory, net </link:label>
<link:label id="lab_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F_label_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InventoryNetAbstract" xlink:label="loc_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F" xlink:to="lab_us-gaap_InventoryNetAbstract_D45AB6269F81A9523685DEBE8E81AC9F" xlink:type="arc"/>
<link:label id="lab_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Raw materials </link:label>
<link:label id="lab_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52_label_en-US" xlink:label="lab_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Raw Materials, Net of Reserves </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52" xlink:to="lab_us-gaap_InventoryRawMaterialsNetOfReserves_A260022AD3474F218A73DEBE8E819C52" xlink:type="arc"/>
<link:label id="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Finished goods </link:label>
<link:label id="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Finished Goods, Net of Reserves </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065" xlink:to="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_9D5365C7634F8CA8D453DEBE8E81B065" xlink:type="arc"/>
<link:label id="lab_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total inventory </link:label>
<link:label id="lab_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2_label_en-US" xlink:label="lab_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2" xlink:to="lab_us-gaap_InventoryNet_627C32A96D8AD6CB90D6DEBE8E8171E2" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of fair values of financial assets </link:label>
<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446" xlink:to="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_6A3D1982FDDD4EFA99BCDEBE8EBD4446" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DC0F90D66B7CCA70FDD3DEBE8DC1F22C" xlink:type="arc"/>
<link:label id="lab_us-gaap_AwardTypeAxis_C2826815CAC84AD2110BDEBE8DC1FA17_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_C2826815CAC84AD2110BDEBE8DC1FA17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
<link:label id="lab_us-gaap_AwardTypeAxis_C2826815CAC84AD2110BDEBE8DC1FA17_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_C2826815CAC84AD2110BDEBE8DC1FA17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
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<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_493449CE599B6DE1BB0DDEBE8DC122A3_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_493449CE599B6DE1BB0DDEBE8DC122A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Member] </link:label>
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<link:label id="lab_us-gaap_PerformanceSharesMember_65A8CC2EFDFA6901ED07DEBE8DC74630_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_65A8CC2EFDFA6901ED07DEBE8DC74630" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> PRSUs </link:label>
<link:label id="lab_us-gaap_PerformanceSharesMember_65A8CC2EFDFA6901ED07DEBE8DC74630_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_65A8CC2EFDFA6901ED07DEBE8DC74630" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Shares [Member] </link:label>
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<link:label id="lab_us-gaap_RestrictedStockMember_32A0ADDACFA923B5A5EDDEBE8DC7286B_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_32A0ADDACFA923B5A5EDDEBE8DC7286B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> RSAs </link:label>
<link:label id="lab_us-gaap_RestrictedStockMember_32A0ADDACFA923B5A5EDDEBE8DC7286B_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_32A0ADDACFA923B5A5EDDEBE8DC7286B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock [Member] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49872B80C10FA178353BDEBE8DC7ACE9_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49872B80C10FA178353BDEBE8DC7ACE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9EDAD6D55DA3502BE290DEBE8DC77A29_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9EDAD6D55DA3502BE290DEBE8DC77A29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> RSU, PRSU and RSA, Number of Shares: </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A34B5EAC7CB0B91A46FEDEBE8DC74AF6_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_A34B5EAC7CB0B91A46FEDEBE8DC74AF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_D25AA1A409E6D02267CEDEBE8DC702F2_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_D25AA1A409E6D02267CEDEBE8DC702F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_B066404D85C0EAAC133EDEBE8DC81D30_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_B066404D85C0EAAC133EDEBE8DC81D30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_39FC98BE2575387E0D0CDEBE8DC8D501_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_39FC98BE2575387E0D0CDEBE8DC8D501" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Canceled (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_39FC98BE2575387E0D0CDEBE8DC8D501_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_39FC98BE2575387E0D0CDEBE8DC8D501" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6B3B2F1329BBBDFB6235DEBE8DC8A12D_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6B3B2F1329BBBDFB6235DEBE8DC8A12D" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Outstanding, ending (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_0AC2E477D2D9B47F3D55DEBE8D91A04D_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_0AC2E477D2D9B47F3D55DEBE8D91A04D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_0AC2E477D2D9B47F3D55DEBE8D91A04D_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_0AC2E477D2D9B47F3D55DEBE8D91A04D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_LineOfCreditFacilityAbstract_8DE07DECC70A9A6AB4DCDEBE8EBE6041_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAbstract_8DE07DECC70A9A6AB4DCDEBE8EBE6041" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityAbstract" xlink:label="loc_us-gaap_LineOfCreditFacilityAbstract_8DE07DECC70A9A6AB4DCDEBE8EBE6041" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtDisclosureTextBlock_C543A75A2E946BE5876EDEBE8EBECE5B_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_C543A75A2E946BE5876EDEBE8EBECE5B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility </link:label>
<link:label id="lab_us-gaap_DebtDisclosureTextBlock_C543A75A2E946BE5876EDEBE8EBECE5B_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_C543A75A2E946BE5876EDEBE8EBECE5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_C543A75A2E946BE5876EDEBE8EBECE5B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsReceivableNetCurrentAbstract_77B267D50FC660BBF8F4DEBE8E078582_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrentAbstract_77B267D50FC660BBF8F4DEBE8E078582" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of accounts receivable, net </link:label>
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<link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_42B7282CF3FA2FFC8E15DEBE8E0709FF_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_42B7282CF3FA2FFC8E15DEBE8E0709FF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable </link:label>
<link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_42B7282CF3FA2FFC8E15DEBE8E0709FF_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_42B7282CF3FA2FFC8E15DEBE8E0709FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Gross, Current </link:label>
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<link:label id="lab_calx_ProductReturnReserve_6946D6092A85D0247243DEBE8E0821F0_negatedLabel_en-US" xlink:label="lab_calx_ProductReturnReserve_6946D6092A85D0247243DEBE8E0821F0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Product return reserve </link:label>
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<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_B7FCB2855BE1C369520DDEBE8E081ACF_totalLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_B7FCB2855BE1C369520DDEBE8E081ACF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>
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<link:label id="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_B8975B6FAADC9014D4C7DEBE8E09FFBC_label_en-US" xlink:label="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_B8975B6FAADC9014D4C7DEBE8E09FFBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Compensation and Retirement Disclosure [Abstract] </link:label>
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<link:label id="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_CC53DB419E3E1AC2BB49DEBE8E09661D_label_en-US" xlink:label="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_CC53DB419E3E1AC2BB49DEBE8E09661D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Compensation and Employee Benefit Plans [Text Block] </link:label>
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<link:label id="lab_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
<link:label id="lab_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B" xlink:to="lab_us-gaap_PlanNameAxis_78B7F38B41545AB6C843DEBE8E437F1B" xlink:type="arc"/>
<link:label id="lab_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:label id="lab_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13" xlink:to="lab_us-gaap_PlanNameDomain_767726EFED6FDB6459A6DEBE8E43CB13" xlink:type="arc"/>
<link:label id="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9_terseLabel_en-US" xlink:label="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2010 Plan </link:label>
<link:label id="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9_label_en-US" xlink:label="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2010 Plan [Member] </link:label>
<link:label id="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9_documentation_en-US" xlink:label="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2010 Plan [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_A2010PlanMember" xlink:label="loc_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:to="lab_calx_A2010PlanMember_9389CDCCFCCC3533F8F7DEBE8E43EEE9" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> ESPP </link:label>
<link:label id="lab_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835_label_en-US" xlink:label="lab_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835" xlink:to="lab_us-gaap_EmployeeStockMember_09E3C583B84F3CE73702DEBE8E437835" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_BAB21F7B5736182FDF5ADEBE8E4312CC_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_BAB21F7B5736182FDF5ADEBE8E4312CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock options outstanding </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_BAB21F7B5736182FDF5ADEBE8E4312CC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_BAB21F7B5736182FDF5ADEBE8E4312CC" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_BAB21F7B5736182FDF5ADEBE8E4312CC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EDADDA8E8538AFD708C9DEBE8E438FED_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EDADDA8E8538AFD708C9DEBE8E438FED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding awards, instruments other than options </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EDADDA8E8538AFD708C9DEBE8E438FED" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EDADDA8E8538AFD708C9DEBE8E438FED" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EDADDA8E8538AFD708C9DEBE8E438FED" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8D17C8E378189C612ACEDEBE8E439707_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8D17C8E378189C612ACEDEBE8E439707" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Shares available for future grant under 2010 Plan </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8D17C8E378189C612ACEDEBE8E439707_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8D17C8E378189C612ACEDEBE8E439707" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8D17C8E378189C612ACEDEBE8E439707" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares available for future issuance under ESPP </link:label>
<link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451_label_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Capital Shares Reserved for Future Issuance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451" xlink:to="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_C6FBBA8C8B1288F61C0ADEBE8E438451" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2FD2E1B2CFB46438BA6ADEBE8E434483_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2FD2E1B2CFB46438BA6ADEBE8E434483" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock warrants </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2FD2E1B2CFB46438BA6ADEBE8E434483_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2FD2E1B2CFB46438BA6ADEBE8E434483" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right, Number of Securities Called by Warrants or Rights </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_2FD2E1B2CFB46438BA6ADEBE8E434483" xlink:type="locator"/>
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<link:label id="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_D4AB2C0CFCCBD92A71058811694D3A81_verboseLabel_en-US" xlink:label="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_D4AB2C0CFCCBD92A71058811694D3A81" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Product warranty activities [Roll Forward] </link:label>
<link:label id="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_D4AB2C0CFCCBD92A71058811694D3A81_label_en-US" xlink:label="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_D4AB2C0CFCCBD92A71058811694D3A81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward" xlink:label="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_D4AB2C0CFCCBD92A71058811694D3A81" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductWarrantyAccrual_58202D8C9E955F674FB78811694D36F1_periodStartLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_58202D8C9E955F674FB78811694D36F1" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Balance at beginning of period </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrual_58202D8C9E955F674FB78811694D36F1_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_58202D8C9E955F674FB78811694D36F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Accrual </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_58202D8C9E955F674FB78811694D36F1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_CF59C2B58FC454B7C4A38811694D41B4_verboseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_CF59C2B58FC454B7C4A38811694D41B4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Warranty charged to cost of revenue </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_CF59C2B58FC454B7C4A38811694D41B4_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_CF59C2B58FC454B7C4A38811694D41B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Accrual, Warranties Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProductWarrantyAccrualWarrantiesIssued" xlink:label="loc_us-gaap_ProductWarrantyAccrualWarrantiesIssued_CF59C2B58FC454B7C4A38811694D41B4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualPayments_AEF499F84A64B4F8B7158811694D6862_negatedLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPayments_AEF499F84A64B4F8B7158811694D6862" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Utilization of warranty </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualPayments_AEF499F84A64B4F8B7158811694D6862_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPayments_AEF499F84A64B4F8B7158811694D6862" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Accrual, Payments </link:label>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_3BC66A80AD75B93592DE889FC87EDABB_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_3BC66A80AD75B93592DE889FC87EDABB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to pre-existing warranty </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_3BC66A80AD75B93592DE889FC87EDABB_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_3BC66A80AD75B93592DE889FC87EDABB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Warranty Accrual, Preexisting, Increase (Decrease) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease" xlink:label="loc_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_3BC66A80AD75B93592DE889FC87EDABB" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_84D1A79BD815745E8D2A8D0268846218" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_608C6EA3D3C95BAC98F78D0268840632_periodEndLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_608C6EA3D3C95BAC98F78D0268840632" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Balance at end of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_608C6EA3D3C95BAC98F78D0268840632" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_608C6EA3D3C95BAC98F78D0268840632" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_608C6EA3D3C95BAC98F78D0268840632" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Revenues from External Customers and Long-Lived Assets [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Revenues from External Customers and Long-Lived Assets [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD" xlink:to="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_EF7B5E8E41AA746D9509DEBE8E5582DD" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2_terseLabel_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Geographical [Axis] </link:label>
<link:label id="lab_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2_label_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Geographical [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2" xlink:to="lab_us-gaap_StatementGeographicalAxis_FFC249BB1B39C2EBDDF2DEBE8E55C2B2" xlink:type="arc"/>
<link:label id="lab_us-gaap_SegmentGeographicalDomain_2B1A66ADEA8E0DE4FBA0DEBE8E555ED8_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_2B1A66ADEA8E0DE4FBA0DEBE8E555ED8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segment, Geographical [Domain] </link:label>
<link:label id="lab_us-gaap_SegmentGeographicalDomain_2B1A66ADEA8E0DE4FBA0DEBE8E555ED8_label_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_2B1A66ADEA8E0DE4FBA0DEBE8E555ED8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Geographical [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_2B1A66ADEA8E0DE4FBA0DEBE8E555ED8" xlink:type="locator"/>
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<link:label id="lab_country_US_48027AB84432721A4C13DEBE8E55454F_terseLabel_en-US" xlink:label="lab_country_US_48027AB84432721A4C13DEBE8E55454F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> United States </link:label>
<link:label id="lab_country_US_48027AB84432721A4C13DEBE8E55454F_label_en-US" xlink:label="lab_country_US_48027AB84432721A4C13DEBE8E55454F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> UNITED STATES </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_US" xlink:label="loc_country_US_48027AB84432721A4C13DEBE8E55454F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US_48027AB84432721A4C13DEBE8E55454F" xlink:to="lab_country_US_48027AB84432721A4C13DEBE8E55454F" xlink:type="arc"/>
<link:label id="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130_terseLabel_en-US" xlink:label="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Caribbean </link:label>
<link:label id="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130_label_en-US" xlink:label="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Caribbean [Member] </link:label>
<link:label id="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130_documentation_en-US" xlink:label="lab_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Caribbean [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_CaribbeanMember" xlink:label="loc_calx_CaribbeanMember_D59A11215A45ECD9CC4DDEBE8E551130" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EuropeMember_B4E366DC6BDC940405CFDEBE8E55BB28_terseLabel_en-US" xlink:label="lab_us-gaap_EuropeMember_B4E366DC6BDC940405CFDEBE8E55BB28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Europe </link:label>
<link:label id="lab_us-gaap_EuropeMember_B4E366DC6BDC940405CFDEBE8E55BB28_label_en-US" xlink:label="lab_us-gaap_EuropeMember_B4E366DC6BDC940405CFDEBE8E55BB28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Europe [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EuropeMember" xlink:label="loc_us-gaap_EuropeMember_B4E366DC6BDC940405CFDEBE8E55BB28" xlink:type="locator"/>
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<link:label id="lab_country_CA_19223DD3BDE126729E6EDEBE8E55D32C_terseLabel_en-US" xlink:label="lab_country_CA_19223DD3BDE126729E6EDEBE8E55D32C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Canada </link:label>
<link:label id="lab_country_CA_19223DD3BDE126729E6EDEBE8E55D32C_label_en-US" xlink:label="lab_country_CA_19223DD3BDE126729E6EDEBE8E55D32C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> CANADA </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_CA" xlink:label="loc_country_CA_19223DD3BDE126729E6EDEBE8E55D32C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CA_19223DD3BDE126729E6EDEBE8E55D32C" xlink:to="lab_country_CA_19223DD3BDE126729E6EDEBE8E55D32C" xlink:type="arc"/>
<link:label id="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B_terseLabel_en-US" xlink:label="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B_label_en-US" xlink:label="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segment, Geographical, Other Countries [Member] </link:label>
<link:label id="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B_documentation_en-US" xlink:label="lab_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Segment, Geographical, Other Countries [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_SegmentGeographicalOtherCountriesMember" xlink:label="loc_calx_SegmentGeographicalOtherCountriesMember_6912161CEC2660C300C8DEBE8E55BA9B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6380594DD99899679381DEBE8E5543A8_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6380594DD99899679381DEBE8E5543A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenues from External Customers and Long-Lived Assets [Line Items] </link:label>
<link:label id="lab_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6380594DD99899679381DEBE8E5543A8_label_en-US" xlink:label="lab_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6380594DD99899679381DEBE8E5543A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenues from External Customers and Long-Lived Assets [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6380594DD99899679381DEBE8E5543A8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountingPoliciesAbstract_DD8EF7D80E17196D115EDEBE8E50C058_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_DD8EF7D80E17196D115EDEBE8E50C058" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounting Policies [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_DD8EF7D80E17196D115EDEBE8E50C058" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_F1AB1B674125043AB158DEBE8E50196C_terseLabel_en-US" xlink:label="lab_us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_F1AB1B674125043AB158DEBE8E50196C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Customer Concentration Risk </link:label>
<link:label id="lab_us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_F1AB1B674125043AB158DEBE8E50196C_label_en-US" xlink:label="lab_us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_F1AB1B674125043AB158DEBE8E50196C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedules of Concentration of Risk, by Risk Factor [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock" xlink:label="loc_us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_F1AB1B674125043AB158DEBE8E50196C" xlink:type="locator"/>
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<link:label id="lab_country_CN_378A83724B0CEB2F32288811672C1B14_terseLabel_en-US" xlink:label="lab_country_CN_378A83724B0CEB2F32288811672C1B14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> China </link:label>
<link:label id="lab_country_CN_378A83724B0CEB2F32288811672C1B14_label_en-US" xlink:label="lab_country_CN_378A83724B0CEB2F32288811672C1B14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> CHINA </link:label>
<link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_CN" xlink:label="loc_country_CN_378A83724B0CEB2F32288811672C1B14" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_6FBBCF582B6C2F9B1A068811672D11D2_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_6FBBCF582B6C2F9B1A068811672D11D2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_6FBBCF582B6C2F9B1A068811672D11D2_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_6FBBCF582B6C2F9B1A068811672D11D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_6FBBCF582B6C2F9B1A068811672D11D2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_1C976BDD6192730C00B6AD6D1F693ED4_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit_1C976BDD6192730C00B6AD6D1F693ED4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Federal </link:label>
<link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_1C976BDD6192730C00B6AD6D1F693ED4_label_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit_1C976BDD6192730C00B6AD6D1F693ED4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Federal Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_1C976BDD6192730C00B6AD6D1F693ED4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConcentrationRiskLineItems_2019390985DE72C90A7A840AF91C17BF_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskLineItems_2019390985DE72C90A7A840AF91C17BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk [Line Items] </link:label>
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<link:label id="lab_us-gaap_LineOfCreditFacilityTable_65BEF51A5D1F3C163351E685BFC5D8F9_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable_65BEF51A5D1F3C163351E685BFC5D8F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Table] </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityTable_65BEF51A5D1F3C163351E685BFC5D8F9_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable_65BEF51A5D1F3C163351E685BFC5D8F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_65BEF51A5D1F3C163351E685BFC5D8F9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:label id="lab_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A" xlink:to="lab_us-gaap_VariableRateAxis_750EF157D62432AE0E1DE685BFC5216A" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:label id="lab_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65" xlink:to="lab_us-gaap_VariableRateDomain_9B2A6C5169719AF38597E685BFC54E65" xlink:type="arc"/>
<link:label id="lab_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD_terseLabel_en-US" xlink:label="lab_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Base Rate </link:label>
<link:label id="lab_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD_label_en-US" xlink:label="lab_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Base Rate [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD" xlink:to="lab_us-gaap_BaseRateMember_F902E7DAE5D4A5F7B76EE685BFC5BECD" xlink:type="arc"/>
<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIBOR </link:label>
<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> London Interbank Offered Rate (LIBOR) [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2" xlink:to="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5B4A212D349348B4DDF7E685BFC5EEE2" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:label id="lab_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF" xlink:to="lab_us-gaap_CreditFacilityAxis_789695009E68B9E76F82E685BFC531DF" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:label id="lab_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6" xlink:to="lab_us-gaap_CreditFacilityDomain_30916F63BFE52432E317E685BFC56BC6" xlink:type="arc"/>
<link:label id="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6_terseLabel_en-US" xlink:label="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Swingline Facility </link:label>
<link:label id="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6_label_en-US" xlink:label="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Swingline Facility [Member] </link:label>
<link:label id="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6_documentation_en-US" xlink:label="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Swingline Facility </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_SwinglineFacilityMember" xlink:label="loc_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:to="lab_calx_SwinglineFacilityMember_54559030C9E8DA6B21F0E685BFC524C6" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prior Credit Facility </link:label>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_7ECA0B7D8004A1CEF52EE685BFC6404B" xlink:type="arc"/>
<link:label id="lab_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Letter of Credit </link:label>
<link:label id="lab_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Letter of Credit [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08" xlink:to="lab_us-gaap_LetterOfCreditMember_F021589DDB9C58EA4776E685BFC68C08" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt </link:label>
<link:label id="lab_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMember" xlink:label="loc_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293" xlink:to="lab_us-gaap_LongTermDebtMember_B1C519EA4505871D0271E685BFC6A293" xlink:type="arc"/>
<link:label id="lab_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FBF502BFD612B9BE5E0FE685BFCB2CAA_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FBF502BFD612B9BE5E0FE685BFCB2CAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid Expenses and Other Current Assets </link:label>
<link:label id="lab_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FBF502BFD612B9BE5E0FE685BFCB2CAA_label_en-US" xlink:label="lab_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FBF502BFD612B9BE5E0FE685BFCB2CAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Expenses and Other Current Assets [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_FBF502BFD612B9BE5E0FE685BFCB2CAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsMember_A5A9C07F20CBF58A675FE685BFCBE6F0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsMember_A5A9C07F20CBF58A675FE685BFCBE6F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsMember_A5A9C07F20CBF58A675FE685BFCBE6F0_label_en-US" xlink:label="lab_us-gaap_OtherAssetsMember_A5A9C07F20CBF58A675FE685BFCBE6F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_A5A9C07F20CBF58A675FE685BFCBE6F0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Line Items] </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5" xlink:to="lab_us-gaap_LineOfCreditFacilityLineItems_DC61A50ABE32DA295AA7E685BFCB57E5" xlink:type="arc"/>
<link:label id="lab_calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments_56F56A1C6556D59D80BDE685BFCBF754_terseLabel_en-US" xlink:label="lab_calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments_56F56A1C6556D59D80BDE685BFCBF754" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Term loan repayment, frequency of equal quarterly payments </link:label>
<link:label id="lab_calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments_56F56A1C6556D59D80BDE685BFCBF754_label_en-US" xlink:label="lab_calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments_56F56A1C6556D59D80BDE685BFCBF754" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Frequency Of Payments, Number Of Payments </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments" xlink:label="loc_calx_LineOfCreditFacilityFrequencyOfPaymentsNumberOfPayments_56F56A1C6556D59D80BDE685BFCBF754" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility, maximum capacity </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_959D59FED0C9830483E8E685BFCBBCAC" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility, maturity date </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Expiration Date </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3" xlink:to="lab_us-gaap_LineOfCreditFacilityExpirationDate1_8997A22A7DB567EA396CE685BFCB98D3" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (decrease) in restricted cash </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Restricted Cash for Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111" xlink:to="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_62E20ACF9381B2F9197CE685BFCBB111" xlink:type="arc"/>
<link:label id="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC_terseLabel_en-US" xlink:label="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of one-year period extensions </link:label>
<link:label id="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC_label_en-US" xlink:label="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of one-year period extensions </link:label>
<link:label id="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC_documentation_en-US" xlink:label="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number of one-year period extensions </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_Numberofoneyearperiodextensions" xlink:label="loc_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:to="lab_calx_Numberofoneyearperiodextensions_279E152D4038AC336759E685BFCB12DC" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis spread on variable rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A4024A4022A88B836BFCE685BFCB98F9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Frequency of payment and payment terms </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Frequency of Payment and Payment Terms </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms" xlink:label="loc_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF" xlink:to="lab_us-gaap_LineOfCreditFacilityFrequencyOfPaymentAndPaymentTerms_99A733F6A83758FE95A4E685BFCB97CF" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Commitment fee percentage </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Commitment Fee Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4" xlink:to="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FCCDE2A5CF7AA6E6FD41E685BFCCFDC4" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding letters of credit </link:label>
<link:label id="lab_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Line of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54" xlink:to="lab_us-gaap_LineOfCredit_1521FDA611A2A90C5A09E696D8924A54" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payments of debt issuance costs </link:label>
<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Debt Issuance Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_0C5E4F8D6D06EB0DC7F7E685BFCCE75D" xlink:type="arc"/>
<link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD_terseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized debt issuance expense </link:label>
<link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD_label_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unamortized Debt Issuance Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD" xlink:to="lab_us-gaap_UnamortizedDebtIssuanceExpense_5968B82959C3EFF1D465E685BFCC23BD" xlink:type="arc"/>
<link:label id="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5_terseLabel_en-US" xlink:label="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Swingline loan repayment period </link:label>
<link:label id="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5_label_en-US" xlink:label="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Repayment Period </link:label>
<link:label id="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5_documentation_en-US" xlink:label="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Repayment Period </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_LineOfCreditFacilityRepaymentPeriod" xlink:label="loc_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:to="lab_calx_LineOfCreditFacilityRepaymentPeriod_9CBA2A5CBF1720FCF811E685BFCCA5B5" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Borrowings under the credit facility </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Fair Value of Amount Outstanding </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5" xlink:to="lab_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_36FA5A2DAE36D4BC4BCBE685BFCCB9D5" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_9D848183D074E08A7D2BC8F27FCFA552_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_9D848183D074E08A7D2BC8F27FCFA552" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Domestic </link:label>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_9D848183D074E08A7D2BC8F27FCFA552_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_9D848183D074E08A7D2BC8F27FCFA552" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Income Taxes, Domestic </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_9D848183D074E08A7D2BC8F27FCFA552" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8CC3F37D9FCFF9CDFD65C8F27FCFE672_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8CC3F37D9FCFF9CDFD65C8F27FCFE672" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign </link:label>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8CC3F37D9FCFF9CDFD65C8F27FCFE672_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8CC3F37D9FCFF9CDFD65C8F27FCFE672" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Income Taxes, Foreign </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8CC3F37D9FCFF9CDFD65C8F27FCFE672" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_8EA5052B9A277E66BD1EDEBE8E729B14_verboseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_8EA5052B9A277E66BD1EDEBE8E729B14" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Measurements </link:label>
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<link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_B779EFCDE4105F332A01881169532A11_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_B779EFCDE4105F332A01881169532A11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Rental Payments for Operating Leases </link:label>
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<link:label id="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_C87E0E4FB8C5D0D2BEBA88116953C944_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_C87E0E4FB8C5D0D2BEBA88116953C944" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Product Warranty Liability </link:label>
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<link:label id="lab_calx_ScheduleOfIntangibleAssetsTable_72025ED00D2ED190EE3FDEBE8E316453_terseLabel_en-US" xlink:label="lab_calx_ScheduleOfIntangibleAssetsTable_72025ED00D2ED190EE3FDEBE8E316453" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Intangible Assets [Table] </link:label>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_818ABE8F4ADF595E0167DEBE8E325F35_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_818ABE8F4ADF595E0167DEBE8E325F35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets by Major Class [Axis] </link:label>
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<link:label id="lab_calx_ExistingAndCoreDevelopedTechnologiesMember_06E4DC4DB466328EAF4ADEBE8E320C69_verboseLabel_en-US" xlink:label="lab_calx_ExistingAndCoreDevelopedTechnologiesMember_06E4DC4DB466328EAF4ADEBE8E320C69" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Core developed technology </link:label>
<link:label id="lab_calx_ExistingAndCoreDevelopedTechnologiesMember_06E4DC4DB466328EAF4ADEBE8E320C69_label_en-US" xlink:label="lab_calx_ExistingAndCoreDevelopedTechnologiesMember_06E4DC4DB466328EAF4ADEBE8E320C69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Existing and Core Developed Technologies [Member] </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_ExistingAndCoreDevelopedTechnologiesMember" xlink:label="loc_calx_ExistingAndCoreDevelopedTechnologiesMember_06E4DC4DB466328EAF4ADEBE8E320C69" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CustomerRelationshipsMember_218D6AE98A3001DF012EDEBE8E32E681_verboseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_218D6AE98A3001DF012EDEBE8E32E681" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Customer relationships </link:label>
<link:label id="lab_us-gaap_CustomerRelationshipsMember_218D6AE98A3001DF012EDEBE8E32E681_label_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_218D6AE98A3001DF012EDEBE8E32E681" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer Relationships [Member] </link:label>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_883BBD55FDCBD23898C3DEBE8E3292F6_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_883BBD55FDCBD23898C3DEBE8E3292F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets [Line Items] </link:label>
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<link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_88DA53332AD626CCF5D7DEBE8E32AD91_verboseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_88DA53332AD626CCF5D7DEBE8E32AD91" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of intangible assets </link:label>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_14C03CA6BEB7C51466FADEBE8E32E1EC_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_14C03CA6BEB7C51466FADEBE8E32E1EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gross Carrying Amount </link:label>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_B607AFCBC7943277D1D8DEBE8E32D72F_negatedLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_B607AFCBC7943277D1D8DEBE8E32D72F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Amortization </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_A1DC798BC6253C40384FDEBE8EB2E828" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC_verboseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Expected life </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_B402047454BCB0EB2BD0DEBE8EB2FABC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Expected dividend yield </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_AAC5050213AEB43CBDA9DEBE8EB22D49" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Risk free interest rate </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8DD1784FB48B69801458DEBE8EB2ED53" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Property, Plant and Equipment [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624" xlink:to="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_83714A7D8870EC3AB805840AF8D74624" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B8BC59ADA4C5D6A8A757840AF8D79C8D" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_EF397781AD0AF2B423FD840AF8D7D726" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F_verboseLabel_en-US" xlink:label="lab_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Test equipment </link:label>
<link:label id="lab_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F_label_en-US" xlink:label="lab_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F" xlink:to="lab_us-gaap_EquipmentMember_56D5C8DE815CE26E400A840AF8D7228F" xlink:type="arc"/>
<link:label id="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F_verboseLabel_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Computer equipment and purchased software </link:label>
<link:label id="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F_label_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Computer Equipment and Purchased Software [Member] </link:label>
<link:label id="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F_documentation_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Computer equipment and purchased software. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ComputerEquipmentAndPurchasedSoftwareMember" xlink:label="loc_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:to="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_0053FF3EDCCEA801776C840AF8D71F3F" xlink:type="arc"/>
<link:label id="lab_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E_verboseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Furniture and fixtures </link:label>
<link:label id="lab_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Furniture and Fixtures [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E" xlink:to="lab_us-gaap_FurnitureAndFixturesMember_8300291BFB2A72A643B9840AF8D72C1E" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C_verboseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Leasehold improvements </link:label>
<link:label id="lab_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leasehold Improvements [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C" xlink:to="lab_us-gaap_LeaseholdImprovementsMember_929D52E42182062200A4840AF8D73A0C" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_DB5CC41ECFA311D836DA840AF8D70893" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_22E991A6473707E3F855840AF8D7CF4B_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_22E991A6473707E3F855840AF8D7CF4B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, gross </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_22E991A6473707E3F855840AF8D7CF4B_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_22E991A6473707E3F855840AF8D7CF4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_22E991A6473707E3F855840AF8D7CF4B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5C8AB53D2CDD30C3C769840AF8D7E199_negatedLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5C8AB53D2CDD30C3C769840AF8D7E199" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Accumulated depreciation and amortization </link:label>
<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5C8AB53D2CDD30C3C769840AF8D7E199_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5C8AB53D2CDD30C3C769840AF8D7E199" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5C8AB53D2CDD30C3C769840AF8D7E199" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_586A6995B900D6CD2B14840AF8D7E307_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_586A6995B900D6CD2B14840AF8D7E307" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_586A6995B900D6CD2B14840AF8D7E307" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_F02D7DF21DCAC4BC6E27ADF82ECA2190" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxAssetsNetAbstract_90D1F5D041E5367A9AFEADF82ECA8546_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetAbstract_90D1F5D041E5367A9AFEADF82ECA8546" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net [Abstract] </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsNetAbstract_90D1F5D041E5367A9AFEADF82ECA8546_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetAbstract_90D1F5D041E5367A9AFEADF82ECA8546" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsNetAbstract" xlink:label="loc_us-gaap_DeferredTaxAssetsNetAbstract_90D1F5D041E5367A9AFEADF82ECA8546" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent_C3FCFD59320A7D5C3DF6ADF82ECA9FBE_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent_C3FCFD59320A7D5C3DF6ADF82ECA9FBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, current </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent_C3FCFD59320A7D5C3DF6ADF82ECA9FBE_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent_C3FCFD59320A7D5C3DF6ADF82ECA9FBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent_C3FCFD59320A7D5C3DF6ADF82ECA9FBE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_580F5FA0988C80BD9BB8ADF82ECA473C_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_580F5FA0988C80BD9BB8ADF82ECA473C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, long-term </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_580F5FA0988C80BD9BB8ADF82ECA473C_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_580F5FA0988C80BD9BB8ADF82ECA473C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_580F5FA0988C80BD9BB8ADF82ECA473C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_69AF3D8EE1F4A6AA2D34ADF82ECB7BA1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_69AF3D8EE1F4A6AA2D34ADF82ECB7BA1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax liabilities, long-term </link:label>
<link:label id="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_69AF3D8EE1F4A6AA2D34ADF82ECB7BA1_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_69AF3D8EE1F4A6AA2D34ADF82ECB7BA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Liabilities, Net, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_69AF3D8EE1F4A6AA2D34ADF82ECB7BA1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_7A60FE4DF9DD8DCC7B22ADFC3F75883C_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_7A60FE4DF9DD8DCC7B22ADFC3F75883C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_7A60FE4DF9DD8DCC7B22ADFC3F75883C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8D83FAA6EB7FA702598BADFC3F75CE65_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8D83FAA6EB7FA702598BADFC3F75CE65" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Operating activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8D83FAA6EB7FA702598BADFC3F75CE65_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8D83FAA6EB7FA702598BADFC3F75CE65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8D83FAA6EB7FA702598BADFC3F75CE65" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProfitLoss_8842E5DDCC7C806A3E29ADFC3F75A7D5_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_8842E5DDCC7C806A3E29ADFC3F75A7D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8842E5DDCC7C806A3E29ADFC3F75A7D5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net loss to net cash provided by (used in) operating activities: </link:label>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_D3C9E4BEB818E2746DE8ADFC3F75FE03" xlink:type="arc"/>
<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_5A8C197D146F70A905F5ADFC3F752221_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_5A8C197D146F70A905F5ADFC3F752221" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Loss on retirement of property and equipment </link:label>
<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_5A8C197D146F70A905F5ADFC3F752221_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_5A8C197D146F70A905F5ADFC3F752221" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_5A8C197D146F70A905F5ADFC3F752221" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_964E71EBB7B7DB27CBE9ADFC3F757C9D_verboseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_964E71EBB7B7DB27CBE9ADFC3F757C9D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of intangible assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_964E71EBB7B7DB27CBE9ADFC3F757C9D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_21D5189826F623B884AAADFC3F7558EB_negatedLabel_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_21D5189826F623B884AAADFC3F7558EB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Amortization of premiums relating to available-for-sale securities </link:label>
<link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_21D5189826F623B884AAADFC3F7558EB_label_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_21D5189826F623B884AAADFC3F7558EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accretion (Amortization) of Discounts and Premiums, Investments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_21D5189826F623B884AAADFC3F7558EB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GainLossOnSaleOfInvestments_1445BBF0FBAC8869063CADFC3F75BCD6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfInvestments_1445BBF0FBAC8869063CADFC3F75BCD6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Gain on sale of available-for-sale securities </link:label>
<link:label id="lab_us-gaap_GainLossOnSaleOfInvestments_1445BBF0FBAC8869063CADFC3F75BCD6_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfInvestments_1445BBF0FBAC8869063CADFC3F75BCD6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Sale of Investments </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensation_F99EF3D2AB9DFB96DC3CADFC3F750568_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_F99EF3D2AB9DFB96DC3CADFC3F750568" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensation_F99EF3D2AB9DFB96DC3CADFC3F750568_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_F99EF3D2AB9DFB96DC3CADFC3F750568" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation </link:label>
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<link:label id="lab_calx_UtilizationOfInventoryCredit_8D00DF50DCF1E6AD7E09ADFC3F754289_negatedTerseLabel_en-US" xlink:label="lab_calx_UtilizationOfInventoryCredit_8D00DF50DCF1E6AD7E09ADFC3F754289" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Utilization of inventory credit </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_UtilizationOfInventoryCredit" xlink:label="loc_calx_UtilizationOfInventoryCredit_8D00DF50DCF1E6AD7E09ADFC3F754289" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_451B53F193ECEA205548ADFC3F755F0C_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_451B53F193ECEA205548ADFC3F755F0C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Changes in operating assets and liabilities: </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_451B53F193ECEA205548ADFC3F755F0C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_451B53F193ECEA205548ADFC3F755F0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_5435512DDA0B9D715AFAADFC3F755B83_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities_5435512DDA0B9D715AFAADFC3F755B83" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Restricted cash </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_49B6FA3B7E6D06DA6F04ADFC3F75E94C_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_49B6FA3B7E6D06DA6F04ADFC3F75E94C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_49B6FA3B7E6D06DA6F04ADFC3F75E94C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_49B6FA3B7E6D06DA6F04ADFC3F75E94C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_49B6FA3B7E6D06DA6F04ADFC3F75E94C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_3F9D55E0427619CE43A4ADFC3F76DA64_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_3F9D55E0427619CE43A4ADFC3F76DA64" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Inventory </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_3F9D55E0427619CE43A4ADFC3F76DA64_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_3F9D55E0427619CE43A4ADFC3F76DA64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredCharges_FA04EF86DCF3760FD868ADFC3F768AED_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_FA04EF86DCF3760FD868ADFC3F768AED" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Deferred cost of revenue </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredCharges_FA04EF86DCF3760FD868ADFC3F768AED_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_FA04EF86DCF3760FD868ADFC3F768AED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCharges" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCharges_FA04EF86DCF3760FD868ADFC3F768AED" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_A3F52D71D710E0D27086ADFC3F76F396_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_A3F52D71D710E0D27086ADFC3F76F396" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other assets </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_A3F52D71D710E0D27086ADFC3F76F396_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_A3F52D71D710E0D27086ADFC3F76F396" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_A3F52D71D710E0D27086ADFC3F76F396" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_419CB8AC9B59E3163455ADFC3F763E31_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_419CB8AC9B59E3163455ADFC3F763E31" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_419CB8AC9B59E3163455ADFC3F763E31_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_419CB8AC9B59E3163455ADFC3F763E31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accrued Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_419CB8AC9B59E3163455ADFC3F763E31" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_87E834D3FB918AC7B84AADFC3F767358_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_87E834D3FB918AC7B84AADFC3F767358" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_87E834D3FB918AC7B84AADFC3F767358_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_87E834D3FB918AC7B84AADFC3F767358" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_87E834D3FB918AC7B84AADFC3F767358" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other long-term liabilities </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Noncurrent Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_09B20D94B488EE0C4D7DADFC3F76EE9C" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6560E19461B6D570A361ADFC3F76413C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6560E19461B6D570A361ADFC3F76413C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) operating activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6560E19461B6D570A361ADFC3F76413C_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6560E19461B6D570A361ADFC3F76413C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6560E19461B6D570A361ADFC3F76413C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Investing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7BE665C4CE53ACAF14A6ADFC3F7674DD" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E3A162F51294216DEE91ADFC3F768CAF_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E3A162F51294216DEE91ADFC3F768CAF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Purchases of property and equipment </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E3A162F51294216DEE91ADFC3F768CAF_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E3A162F51294216DEE91ADFC3F768CAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E3A162F51294216DEE91ADFC3F768CAF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_F3F57A123C7DB7D86DF4ADFC3F76641D_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_F3F57A123C7DB7D86DF4ADFC3F76641D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Purchases of marketable securities </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_F3F57A123C7DB7D86DF4ADFC3F76641D_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_F3F57A123C7DB7D86DF4ADFC3F76641D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Marketable Securities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireMarketableSecurities_F3F57A123C7DB7D86DF4ADFC3F76641D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_2318649B79DCC0791E82ADFC3F76FFAA_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_2318649B79DCC0791E82ADFC3F76FFAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sales of marketable securities </link:label>
<link:label id="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_2318649B79DCC0791E82ADFC3F76FFAA_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_2318649B79DCC0791E82ADFC3F76FFAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Sale of Available-for-sale Securities </link:label>
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<link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_1FA0BCD1541F57CCFEFAADFC3F760101_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_1FA0BCD1541F57CCFEFAADFC3F760101" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Maturities of marketable securities </link:label>
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<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_D69BA04A53D16FC95D37ADFC3F776D1F_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_D69BA04A53D16FC95D37ADFC3F776D1F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from employee stock purchase plan </link:label>
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<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_5D4F92BC3832C51C0FC3ADFC3F77AFC4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_5D4F92BC3832C51C0FC3ADFC3F77AFC4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Payments for repurchases of common stock </link:label>
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<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_999B61100D48B1668916ADFC3F77FC8B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_999B61100D48B1668916ADFC3F77FC8B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Taxes paid for awards vested under equity incentive plans </link:label>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_76A4D7DA5C52E67CC5FFADFC3F77EFE4_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_76A4D7DA5C52E67CC5FFADFC3F77EFE4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) financing activities </link:label>
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<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_84F032CD6F9FC0AB1699ADFC3F774C90_verboseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_84F032CD6F9FC0AB1699ADFC3F774C90" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Effect of exchange rate changes on cash and cash equivalents </link:label>
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<link:label id="lab_us-gaap_CommonStockSharesAuthorized_6EC8CB6A0C89D9DBC67C83AEE0C570EF_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_6EC8CB6A0C89D9DBC67C83AEE0C570EF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares authorized </link:label>
<link:label id="lab_us-gaap_CommonStockSharesAuthorized_6EC8CB6A0C89D9DBC67C83AEE0C570EF_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_6EC8CB6A0C89D9DBC67C83AEE0C570EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares Authorized </link:label>
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<link:label id="lab_us-gaap_CommonStockSharesIssued_8AC058B3ED6714FB4EC783AEE0C6A84B_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_8AC058B3ED6714FB4EC783AEE0C6A84B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares issued </link:label>
<link:label id="lab_us-gaap_CommonStockSharesIssued_8AC058B3ED6714FB4EC783AEE0C6A84B_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_8AC058B3ED6714FB4EC783AEE0C6A84B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Issued </link:label>
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<link:label id="lab_us-gaap_CommonStockSharesOutstanding_9DD338C551602ECD732383AEE0C64C7E_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_9DD338C551602ECD732383AEE0C64C7E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares outstanding </link:label>
<link:label id="lab_us-gaap_CommonStockSharesOutstanding_9DD338C551602ECD732383AEE0C64C7E_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_9DD338C551602ECD732383AEE0C64C7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Outstanding </link:label>
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<link:label id="lab_us-gaap_TreasuryStockShares_9717B5910480B984A8C783D423410569_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_9717B5910480B984A8C783D423410569" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares </link:label>
<link:label id="lab_us-gaap_TreasuryStockShares_9717B5910480B984A8C783D423410569_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_9717B5910480B984A8C783D423410569" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2E522B4F52284DEF3AB83241CDD461F0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2E522B4F52284DEF3AB83241CDD461F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average grant date fair value per share, stock options </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2E522B4F52284DEF3AB83241CDD461F0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2E522B4F52284DEF3AB83241CDD461F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2E522B4F52284DEF3AB83241CDD461F0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_48643257E0882BFBF7F1DEBE8E9D8C3D_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_48643257E0882BFBF7F1DEBE8E9D8C3D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of intangible assets </link:label>
<link:label id="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_48643257E0882BFBF7F1DEBE8E9D8C3D_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_48643257E0882BFBF7F1DEBE8E9D8C3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_48643257E0882BFBF7F1DEBE8E9D8C3D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_E3A08A7DBDFCF8A16167DEBE8E9D4390_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_E3A08A7DBDFCF8A16167DEBE8E9D4390" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of expected future amortization </link:label>
<link:label id="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_E3A08A7DBDFCF8A16167DEBE8E9D4390_label_en-US" xlink:label="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_E3A08A7DBDFCF8A16167DEBE8E9D4390" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_E3A08A7DBDFCF8A16167DEBE8E9D4390" xlink:type="locator"/>
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<link:label id="lab_calx_ScheduleOfCertainTermsTableTable_A297314C23AD0E5193E019F0887D7EDA_terseLabel_en-US" xlink:label="lab_calx_ScheduleOfCertainTermsTableTable_A297314C23AD0E5193E019F0887D7EDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Certain Terms [Table] </link:label>
<link:label id="lab_calx_ScheduleOfCertainTermsTableTable_A297314C23AD0E5193E019F0887D7EDA_label_en-US" xlink:label="lab_calx_ScheduleOfCertainTermsTableTable_A297314C23AD0E5193E019F0887D7EDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Certain Terms [Table] [Table] </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_ScheduleOfCertainTermsTableTable" xlink:label="loc_calx_ScheduleOfCertainTermsTableTable_A297314C23AD0E5193E019F0887D7EDA" xlink:type="locator"/>
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<link:label id="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F_terseLabel_en-US" xlink:label="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Certain Terms [Line Items] </link:label>
<link:label id="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F_label_en-US" xlink:label="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Certain Terms [Line Items] [Line Items] </link:label>
<link:label id="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F_documentation_en-US" xlink:label="lab_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Schedule of Certain Terms [Line Items] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ScheduleOfCertainTermsLineItemsLineItems" xlink:label="loc_calx_ScheduleOfCertainTermsLineItemsLineItems_F9802787BF397BC1343A19F0887D664F" xlink:type="locator"/>
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<link:label id="lab_calx_CustomerPaymentTerm_92D7139835F790B8BC9819F0887D99EE_terseLabel_en-US" xlink:label="lab_calx_CustomerPaymentTerm_92D7139835F790B8BC9819F0887D99EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Customer payment term </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_CustomerPaymentTerm" xlink:label="loc_calx_CustomerPaymentTerm_92D7139835F790B8BC9819F0887D99EE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ForeignFinancialInstitutionsActualDeposits_BDDEDAC17543F2AB04A719F0887DC5D4_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignFinancialInstitutionsActualDeposits_BDDEDAC17543F2AB04A719F0887DC5D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash held by foreign subsidiaries </link:label>
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<link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_BA5CD7DE4E8ABCC33D0719F0887D7AA1_verboseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_BA5CD7DE4E8ABCC33D0719F0887D7AA1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Restricted cash </link:label>
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<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_97CA3725793CEE02F63619F0887DFDD6_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_97CA3725793CEE02F63619F0887DFDD6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated impairment loss of goodwill </link:label>
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<link:label id="lab_us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount_7852C52B7DC625CEACE01A03656074E5_terseLabel_en-US" xlink:label="lab_us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount_7852C52B7DC625CEACE01A03656074E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Company's fair value in excess of carrying amount </link:label>
<link:label id="lab_us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount_7852C52B7DC625CEACE01A03656074E5_label_en-US" xlink:label="lab_us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount_7852C52B7DC625CEACE01A03656074E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reporting Unit, Amount of Fair Value in Excess of Carrying Amount </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_7464B19C56C5B40FD98D1A0492BF50F7" xlink:type="locator"/>
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<link:label id="lab_calx_ReportingUnitAmountofFairValueinExcessofCarryingAmountUsingMarketCapitalization_78717EF0F98A4B3B114C1A09333DC5D0_label_en-US" xlink:label="lab_calx_ReportingUnitAmountofFairValueinExcessofCarryingAmountUsingMarketCapitalization_78717EF0F98A4B3B114C1A09333DC5D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reporting Unit, Amount of Fair Value in Excess of Carrying Amount, Using Market Capitalization </link:label>
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<link:loc xlink:href="calx-20151231.xsd#calx_ReportingUnitAmountofFairValueinExcessofCarryingAmountUsingMarketCapitalization" xlink:label="loc_calx_ReportingUnitAmountofFairValueinExcessofCarryingAmountUsingMarketCapitalization_78717EF0F98A4B3B114C1A09333DC5D0" xlink:type="locator"/>
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<link:label id="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221_terseLabel_en-US" xlink:label="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Company's fair value in excess of carrying amount, using market capitalization, percent </link:label>
<link:label id="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221_label_en-US" xlink:label="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount, Using Market Capitalization </link:label>
<link:label id="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221_documentation_en-US" xlink:label="lab_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount, Using Market Capitalization </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization" xlink:label="loc_calx_ReportingUnitPercentageofFairValueinExcessofCarryingAmountUsingMarketCapitalization_1669057AAC55F8FFE9241A0B34F3E221" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillImpairmentLoss_CE20A9AD8F13DA22EDE819F0887DC5CF_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_CE20A9AD8F13DA22EDE819F0887DC5CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill, impairment loss </link:label>
<link:label id="lab_us-gaap_GoodwillImpairmentLoss_CE20A9AD8F13DA22EDE819F0887DC5CF_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_CE20A9AD8F13DA22EDE819F0887DC5CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Impairment Loss </link:label>
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<link:label id="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132_terseLabel_en-US" xlink:label="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Impairment of intangible and long-lived assets </link:label>
<link:label id="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132_label_en-US" xlink:label="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Impairment of Intangible and Other Long-Lived Assets </link:label>
<link:label id="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132_documentation_en-US" xlink:label="lab_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of intangible assets and long lived assets of the Company. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ImpairmentofIntangibleandOtherLongLivedAssets" xlink:label="loc_calx_ImpairmentofIntangibleandOtherLongLivedAssets_8E56BD1A342CA0D7ACBA19F0887DE132" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_49C790972A0C1D00D2C9DEBE8D3F8C8A_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_49C790972A0C1D00D2C9DEBE8D3F8C8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_49C790972A0C1D00D2C9DEBE8D3F8C8A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_49C790972A0C1D00D2C9DEBE8D3F8C8A" xlink:to="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_49C790972A0C1D00D2C9DEBE8D3F8C8A" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedContributionPlanCostRecognized_C72D91345971CC16A004DEBE8D3F4FF3_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanCostRecognized_C72D91345971CC16A004DEBE8D3F4FF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Company matching contributions, 401(K) Plan </link:label>
<link:label id="lab_us-gaap_DefinedContributionPlanCostRecognized_C72D91345971CC16A004DEBE8D3F4FF3_label_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanCostRecognized_C72D91345971CC16A004DEBE8D3F4FF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Contribution Plan, Cost Recognized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_C72D91345971CC16A004DEBE8D3F4FF3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_04D8968A7CCEB96175E032489600EF72_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_04D8968A7CCEB96175E032489600EF72" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, net, Details </link:label>
<link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_04D8968A7CCEB96175E032489600EF72_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_04D8968A7CCEB96175E032489600EF72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_04D8968A7CCEB96175E032489600EF72" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_7DB637F5776D8465532C325C6602DB99_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_7DB637F5776D8465532C325C6602DB99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes In Allowance For Doubtful Accounts And Product Reserve </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock" xlink:label="loc_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_7DB637F5776D8465532C325C6602DB99" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8E0A115F4A579DB14BDD324896006284_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8E0A115F4A579DB14BDD324896006284" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Inventory Details </link:label>
<link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8E0A115F4A579DB14BDD324896006284_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8E0A115F4A579DB14BDD324896006284" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Inventory, Current [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8E0A115F4A579DB14BDD324896006284" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_12037531133782CBB34F324896010A31_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_12037531133782CBB34F324896010A31" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Property and Equipment, net, Details </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_12037531133782CBB34F324896010A31_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_12037531133782CBB34F324896010A31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_12037531133782CBB34F324896010A31" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_6BCB40BD522F43594B01324896017670_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_6BCB40BD522F43594B01324896017670" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities Details </link:label>
<link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_6BCB40BD522F43594B01324896017670_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_6BCB40BD522F43594B01324896017670" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Accrued Liabilities [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_6BCB40BD522F43594B01324896017670" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredRevenueByArrangementDisclosureTextBlock_7B3CC23C7B44A3879CDD32489601B9E6_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueByArrangementDisclosureTextBlock_7B3CC23C7B44A3879CDD32489601B9E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred Revenue Details </link:label>
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<link:label id="lab_us-gaap_ComputerEquipmentMember_BC16F985238056C29396840AF917DED9_terseLabel_en-US" xlink:label="lab_us-gaap_ComputerEquipmentMember_BC16F985238056C29396840AF917DED9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Computer Equipment </link:label>
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<link:label id="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_EE1C9E5AD6CEAB77FAC9840AF9174D6B_terseLabel_en-US" xlink:label="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_EE1C9E5AD6CEAB77FAC9840AF9174D6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchased Software </link:label>
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<link:label id="lab_us-gaap_EquipmentMember_D1FADA6A327614851386840AF9173630_terseLabel_en-US" xlink:label="lab_us-gaap_EquipmentMember_D1FADA6A327614851386840AF9173630" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Test Equipment </link:label>
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<link:label id="lab_us-gaap_FurnitureAndFixturesMember_6AE3AD08F1093D61C795840AF917307C_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_6AE3AD08F1093D61C795840AF917307C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Furniture and Fixtures </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_F0A982EA77FB8E2C1F06840AF918ACD9_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_F0A982EA77FB8E2C1F06840AF918ACD9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Useful life of property and equipment </link:label>
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<link:label id="lab_us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock_C15F0748811C812259F1DEBE8F7EFA0D_terseLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock_C15F0748811C812259F1DEBE8F7EFA0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, and Marketable Securities </link:label>
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<link:label id="lab_us-gaap_EarningsPerShareTextBlock_693B3A03CD1731447CD5DEBE8D9771EB_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_693B3A03CD1731447CD5DEBE8D9771EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share [Text Block] </link:label>
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<link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_4753E3F0398786B37FA7DEBE8D5FEC2A_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_4753E3F0398786B37FA7DEBE8D5FEC2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income </link:label>
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<link:label id="lab_us-gaap_MarketableSecuritiesCurrent_6C7102FAB1956B9FC8D36640764CDD32_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_6C7102FAB1956B9FC8D36640764CDD32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Marketable securities </link:label>
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<link:label id="lab_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current assets </link:label>
<link:label id="lab_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512" xlink:to="lab_us-gaap_AssetsCurrent_11B1C9A1D1DC2D37190B6640764D7512" xlink:type="arc"/>
<link:label id="lab_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A_verboseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:label id="lab_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A_label_en-US" xlink:label="lab_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A" xlink:to="lab_us-gaap_Goodwill_70C1B9E3B7042E870CA76640764D0F7A" xlink:type="arc"/>
<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_407032098F3D1E01903F6640765255B8_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_407032098F3D1E01903F6640765255B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible assets, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_407032098F3D1E01903F6640765255B8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_87FFC90B78089C67D44466407653035A" xlink:type="arc"/>
<link:label id="lab_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total assets </link:label>
<link:label id="lab_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB_label_en-US" xlink:label="lab_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB" xlink:to="lab_us-gaap_Assets_1F7FABDE8C2554DEB7AD664076539BDB" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0BE7667F1C10D806B42766407653840A_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0BE7667F1C10D806B42766407653840A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> LIABILITIES AND STOCKHOLDERS’ EQUITY </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0BE7667F1C10D806B42766407653840A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0BE7667F1C10D806B42766407653840A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0BE7667F1C10D806B42766407653840A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Current liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C" xlink:to="lab_us-gaap_LiabilitiesCurrentAbstract_E4D5B0992497D45AE0E0664076534A8C" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountsPayableCurrent_D2FAECBD9ED04CD3B2F966407653354C_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_D2FAECBD9ED04CD3B2F966407653354C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>
<link:label id="lab_us-gaap_AccountsPayableCurrent_D2FAECBD9ED04CD3B2F966407653354C_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_D2FAECBD9ED04CD3B2F966407653354C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_D2FAECBD9ED04CD3B2F966407653354C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_917ABFEB2E2B8DDB07E6664076530CDA_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_917ABFEB2E2B8DDB07E6664076530CDA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_917ABFEB2E2B8DDB07E6664076530CDA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_917ABFEB2E2B8DDB07E6664076530CDA" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_917ABFEB2E2B8DDB07E6664076530CDA" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68" xlink:to="lab_us-gaap_DeferredRevenueCurrent_4A539F115F8869B61497664076538C68" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD" xlink:to="lab_us-gaap_LiabilitiesCurrent_A7A5A048E4E808512D8E6640765368BD" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueNoncurrent_FF2BEAB79432CD260A356640765377A8_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_FF2BEAB79432CD260A356640765377A8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Long-term portion of deferred revenue </link:label>
<link:label id="lab_us-gaap_DeferredRevenueNoncurrent_FF2BEAB79432CD260A356640765377A8_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_FF2BEAB79432CD260A356640765377A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_FF2BEAB79432CD260A356640765377A8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_9ACE011343567699518B66407653EC39_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_9ACE011343567699518B66407653EC39" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other long-term liabilities </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_9ACE011343567699518B66407653EC39_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_9ACE011343567699518B66407653EC39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_9ACE011343567699518B66407653EC39" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Liabilities_DBFDCEA7AAE4D879C3A4664076533464_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_DBFDCEA7AAE4D879C3A4664076533464" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities </link:label>
<link:label id="lab_us-gaap_Liabilities_DBFDCEA7AAE4D879C3A4664076533464_label_en-US" xlink:label="lab_us-gaap_Liabilities_DBFDCEA7AAE4D879C3A4664076533464" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_DBFDCEA7AAE4D879C3A4664076533464" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingencies_E465C534F39D55F5B9CD664076531149_verboseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_E465C534F39D55F5B9CD664076531149" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Commitments and contingencies (See Note 6) </link:label>
<link:label id="lab_us-gaap_CommitmentsAndContingencies_E465C534F39D55F5B9CD664076531149_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_E465C534F39D55F5B9CD664076531149" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_E465C534F39D55F5B9CD664076531149" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquityAbstract_77FFBD3FA13590B2C1F8664076533B45_verboseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_77FFBD3FA13590B2C1F8664076533B45" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders’ equity: </link:label>
<link:label id="lab_us-gaap_StockholdersEquityAbstract_77FFBD3FA13590B2C1F8664076533B45_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_77FFBD3FA13590B2C1F8664076533B45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Attributable to Parent [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_77FFBD3FA13590B2C1F8664076533B45" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockValue_0F38B49A4A59EB458DA566407654CE26_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockValue_0F38B49A4A59EB458DA566407654CE26" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, $0.025 par value; 5,000,000 shares authorized; no shares issued and outstanding as of December 31, 2015 and December 31, 2014 </link:label>
<link:label id="lab_us-gaap_PreferredStockValue_0F38B49A4A59EB458DA566407654CE26_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_0F38B49A4A59EB458DA566407654CE26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Value, Issued </link:label>
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<link:label id="lab_us-gaap_CommonStockValue_5CAF32A88FCF42936CEF66407654C13D_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_5CAF32A88FCF42936CEF66407654C13D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, $0.025 par value; 100,000,000 shares authorized; 53,049,781 shares issued and 49,509,251 shares outstanding as of December 31, 2015, and 51,628,257 shares issued and outstanding as of December 31, 2014 </link:label>
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<link:label id="lab_us-gaap_TreasuryStockValue_07CC54626E797BA72A3566407654F7DB_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_07CC54626E797BA72A3566407654F7DB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock, 3,540,530 shares as of December 31, 2015 </link:label>
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<link:label id="lab_us-gaap_StockholdersEquity_74173468F81A60D68BF9664076544D43_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity_74173468F81A60D68BF9664076544D43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Attributable to Parent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_74173468F81A60D68BF9664076544D43" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_AD885AB47BB6669D8CCA664076545FDF_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_AD885AB47BB6669D8CCA664076545FDF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities and stockholders’ equity </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_AD885AB47BB6669D8CCA664076545FDF_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_AD885AB47BB6669D8CCA664076545FDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity </link:label>
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<link:label id="lab_us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_3B26D2A5343240B299E4DEBE8E7361C2_verboseLabel_en-US" xlink:label="lab_us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_3B26D2A5343240B299E4DEBE8E7361C2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Balance Sheet Details </link:label>
<link:label id="lab_us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_3B26D2A5343240B299E4DEBE8E7361C2_label_en-US" xlink:label="lab_us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_3B26D2A5343240B299E4DEBE8E7361C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Balance Sheet Disclosures [Text Block] </link:label>
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<link:label id="lab_us-gaap_StatementOfStockholdersEquityAbstract_B4E17CBACB5981472BA41A062638F1B1_label_en-US" xlink:label="lab_us-gaap_StatementOfStockholdersEquityAbstract_B4E17CBACB5981472BA41A062638F1B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Stockholders' Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_CommonStockMember_F9C24AD7F5FA6302A3CF1A06263899DD_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_F9C24AD7F5FA6302A3CF1A06263899DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common Stock </link:label>
<link:label id="lab_us-gaap_CommonStockMember_F9C24AD7F5FA6302A3CF1A06263899DD_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_F9C24AD7F5FA6302A3CF1A06263899DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock [Member] </link:label>
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<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_888A682558FF0D28BE9C1A0626381F5A_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_888A682558FF0D28BE9C1A0626381F5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_888A682558FF0D28BE9C1A0626381F5A_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_888A682558FF0D28BE9C1A0626381F5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_888A682558FF0D28BE9C1A0626381F5A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D1473F3E4623A06487961A062638E732_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D1473F3E4623A06487961A062638E732" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss) </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D1473F3E4623A06487961A062638E732_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D1473F3E4623A06487961A062638E732" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss) [Member] </link:label>
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<link:label id="lab_us-gaap_RetainedEarningsMember_0CCC0BBA6A1B8E78F6BF1A0626387D78_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_0CCC0BBA6A1B8E78F6BF1A0626387D78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Deficit </link:label>
<link:label id="lab_us-gaap_RetainedEarningsMember_0CCC0BBA6A1B8E78F6BF1A0626387D78_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_0CCC0BBA6A1B8E78F6BF1A0626387D78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings [Member] </link:label>
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<link:label id="lab_us-gaap_TreasuryStockMember_8380ADF51074DE05E6F61A06263922E6_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_8380ADF51074DE05E6F61A06263922E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury Stock </link:label>
<link:label id="lab_us-gaap_TreasuryStockMember_8380ADF51074DE05E6F61A06263922E6_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_8380ADF51074DE05E6F61A06263922E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock [Member] </link:label>
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<link:label id="lab_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Restricted stock awards forfeited </link:label>
<link:label id="lab_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867_label_en-US" xlink:label="lab_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Award, Forfeitures </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RestrictedStockAwardForfeitures" xlink:label="loc_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867" xlink:to="lab_us-gaap_RestrictedStockAwardForfeitures_7BF91C601883B954A7731A06263A9867" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_F816B5D208AB47796E681A06263AB93F_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_F816B5D208AB47796E681A06263AB93F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_F816B5D208AB47796E681A06263AB93F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_F816B5D208AB47796E681A06263AB93F" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_F816B5D208AB47796E681A06263AB93F" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodShares_ECBC43A1334539CF28C11A06263A7439_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodShares_ECBC43A1334539CF28C11A06263A7439" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repurchases of common stock, shares </link:label>
<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodShares_ECBC43A1334539CF28C11A06263A7439_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodShares_ECBC43A1334539CF28C11A06263A7439" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchased During Period, Shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_ECBC43A1334539CF28C11A06263A7439" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_8E252E86595CECA3719D1A06263AAB2E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_8E252E86595CECA3719D1A06263AAB2E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repurchases of common stock </link:label>
<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_8E252E86595CECA3719D1A06263AAB2E_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_8E252E86595CECA3719D1A06263AAB2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchased During Period, Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_8E252E86595CECA3719D1A06263AAB2E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockSharesOutstanding_77883C3A03A1CDCFC96F1A06263A937C_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_77883C3A03A1CDCFC96F1A06263A937C" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending Balance, shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_77883C3A03A1CDCFC96F1A06263A937C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquity_70EDBE52CF573BF67F1E1A06263A1A14_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_70EDBE52CF573BF67F1E1A06263A1A14" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending Balance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_70EDBE52CF573BF67F1E1A06263A1A14" xlink:type="locator"/>
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<link:label id="lab_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9_terseLabel_en-US" xlink:label="lab_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting [Axis] </link:label>
<link:label id="lab_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9_label_en-US" xlink:label="lab_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vesting [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9" xlink:to="lab_us-gaap_VestingAxis_2BC7A2D1CA227AFFB723E685C029C6F9" xlink:type="arc"/>
<link:label id="lab_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0_terseLabel_en-US" xlink:label="lab_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting [Domain] </link:label>
<link:label id="lab_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0_label_en-US" xlink:label="lab_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vesting [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0" xlink:to="lab_us-gaap_VestingDomain_B09ABA417DF72E3571F7E685C02AC8B0" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Year one vesting </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Award, Tranche One [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8FC7B4CB35ABE4DB36C2E685C02A7206" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional years of monthly vesting </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Award, Tranche Two [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_99CEC1FFE39A62C99FB6E685C02ABB8B" xlink:type="arc"/>
<link:label id="lab_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4_terseLabel_en-US" xlink:label="lab_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sale of Stock [Axis] </link:label>
<link:label id="lab_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4_label_en-US" xlink:label="lab_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sale of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4" xlink:to="lab_us-gaap_SubsidiarySaleOfStockAxis_10864B15EF0D38B04F7AE685C02A4AC4" xlink:type="arc"/>
<link:label id="lab_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sale of Stock [Domain] </link:label>
<link:label id="lab_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913_label_en-US" xlink:label="lab_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sale of Stock [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913" xlink:to="lab_us-gaap_SaleOfStockNameOfTransactionDomain_2F81C3C89372608E589FE685C02A8913" xlink:type="arc"/>
<link:label id="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2_terseLabel_en-US" xlink:label="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Underwriter Option </link:label>
<link:label id="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2_label_en-US" xlink:label="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Underwriter Option [Member] </link:label>
<link:label id="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2_documentation_en-US" xlink:label="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Underwriter Option [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_UnderwriterOptionMember" xlink:label="loc_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:to="lab_calx_UnderwriterOptionMember_387263C5A08D89426F1AE685C02A1DC2" xlink:type="arc"/>
<link:label id="lab_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374_terseLabel_en-US" xlink:label="lab_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> IPO </link:label>
<link:label id="lab_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374_label_en-US" xlink:label="lab_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> IPO [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IPOMember" xlink:label="loc_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374" xlink:to="lab_us-gaap_IPOMember_B575097D751B2B541D10E685C02A3374" xlink:type="arc"/>
<link:label id="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE_terseLabel_en-US" xlink:label="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Option By Type [Axis] </link:label>
<link:label id="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE_label_en-US" xlink:label="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Option By Type [Axis] </link:label>
<link:label id="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE_documentation_en-US" xlink:label="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Stock Option By Type [Axis] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_StockOptionByTypeAxis" xlink:label="loc_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:to="lab_calx_StockOptionByTypeAxis_91359201F618FBA1D52DE685C02A31FE" xlink:type="arc"/>
<link:label id="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6_terseLabel_en-US" xlink:label="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Option Type [Domain] </link:label>
<link:label id="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6_label_en-US" xlink:label="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Option By Type [Domain] </link:label>
<link:label id="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6_documentation_en-US" xlink:label="lab_calx_StockOptionByTypeDomain_B547EE2CD0BF822EE4A8E685C02A0CE6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Domain] for Stock Option By Type [Axis] </link:label>
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<link:label id="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E_terseLabel_en-US" xlink:label="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Incentive Stock Option </link:label>
<link:label id="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E_label_en-US" xlink:label="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Incentive Stock Option [Member] </link:label>
<link:label id="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E_documentation_en-US" xlink:label="lab_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> incentive stock option [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_IncentiveStockOptionMember" xlink:label="loc_calx_IncentiveStockOptionMember_E1EEEA97C1E064820203E685C02AEF1E" xlink:type="locator"/>
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<link:label id="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD_terseLabel_en-US" xlink:label="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-qualified Stock Option </link:label>
<link:label id="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD_label_en-US" xlink:label="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Non-qualified Stock Option [Member] </link:label>
<link:label id="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD_documentation_en-US" xlink:label="lab_calx_NonQualifiedStockOptionMember_66937F46D65FF3EA6304E685C02AD6FD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Non-qualified Stock Option [Member] </link:label>
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<link:label id="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741_terseLabel_en-US" xlink:label="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prior Plans </link:label>
<link:label id="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741_label_en-US" xlink:label="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prior Plans [Member] </link:label>
<link:label id="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741_documentation_en-US" xlink:label="lab_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Prior Plans [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_PriorPlansMember" xlink:label="loc_calx_PriorPlansMember_BF9F533738BA927E63DCE685C02A2741" xlink:type="locator"/>
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<link:label id="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867_terseLabel_en-US" xlink:label="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2002 Plan </link:label>
<link:label id="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867_label_en-US" xlink:label="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2002 Plan [Member] </link:label>
<link:label id="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867_documentation_en-US" xlink:label="lab_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2002 Plan [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_A2002PlanMember" xlink:label="loc_calx_A2002PlanMember_441AD5F4AA24772A7AD3E685C02B9867" xlink:type="locator"/>
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<link:label id="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482_terseLabel_en-US" xlink:label="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Transition and Separation Agreement with Roger Weingarth </link:label>
<link:label id="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482_label_en-US" xlink:label="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Transition And Separation Agreement With Roger Weingarth [Member] </link:label>
<link:label id="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482_documentation_en-US" xlink:label="lab_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Transition And Separation Agreement With Roger Weingarth [Member] </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_TransitionAndSeparationAgreementWithRogerWeingarthMember" xlink:label="loc_calx_TransitionAndSeparationAgreementWithRogerWeingarthMember_FA171B183F540A3DF6BFE685C02BE482" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EquityIssuanceDates_232A182B4BA6C75343F6E685C031E009_terseLabel_en-US" xlink:label="lab_us-gaap_EquityIssuanceDates_232A182B4BA6C75343F6E685C031E009" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, issuance date </link:label>
<link:label id="lab_us-gaap_EquityIssuanceDates_232A182B4BA6C75343F6E685C031E009_label_en-US" xlink:label="lab_us-gaap_EquityIssuanceDates_232A182B4BA6C75343F6E685C031E009" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Development Stage Entities, Equity Issuance, Date </link:label>
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<link:label id="lab_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_661FAA0741F996115416E685C0318299_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_661FAA0741F996115416E685C0318299" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock split, conversion ratio </link:label>
<link:label id="lab_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_661FAA0741F996115416E685C0318299_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_661FAA0741F996115416E685C0318299" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note, Stock Split, Conversion Ratio </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityNoteStockSplitConversionRatio1" xlink:label="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_661FAA0741F996115416E685C0318299" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_09CBFD4A231564762A36E685C031D1AA_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_09CBFD4A231564762A36E685C031D1AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, sold in initial public offering, shares </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_09CBFD4A231564762A36E685C031D1AA_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_09CBFD4A231564762A36E685C031D1AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Shares, New Issues </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_09CBFD4A231564762A36E685C031D1AA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SaleOfStockPricePerShare_A9F78EE1CB253CB63B51E685C031DBD9_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare_A9F78EE1CB253CB63B51E685C031DBD9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Initial public offering, price per share (in dollars per share) </link:label>
<link:label id="lab_us-gaap_SaleOfStockPricePerShare_A9F78EE1CB253CB63B51E685C031DBD9_label_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare_A9F78EE1CB253CB63B51E685C031DBD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sale of Stock, Price Per Share </link:label>
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<link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_65CE9C4490114A8D9462E685C031258E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_65CE9C4490114A8D9462E685C031258E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from issuance of common stock </link:label>
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<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_9A657699B916AB4C7D4EE685C0310DDA_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_9A657699B916AB4C7D4EE685C0310DDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock issuance costs </link:label>
<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_9A657699B916AB4C7D4EE685C0310DDA_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_9A657699B916AB4C7D4EE685C0310DDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs </link:label>
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<link:label id="lab_calx_UnderwritersFee_76EBE5E1B91A902C9D65E685C0313ECA_terseLabel_en-US" xlink:label="lab_calx_UnderwritersFee_76EBE5E1B91A902C9D65E685C0313ECA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Underwriter's fee </link:label>
<link:label id="lab_calx_UnderwritersFee_76EBE5E1B91A902C9D65E685C0313ECA_label_en-US" xlink:label="lab_calx_UnderwritersFee_76EBE5E1B91A902C9D65E685C0313ECA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Underwriter's Fee </link:label>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_23CC4882CC80416B2BE2E685C03195EC_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_23CC4882CC80416B2BE2E685C03195EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stock issued in connection with business acquisition, shares </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_23CC4882CC80416B2BE2E685C03195EC_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_23CC4882CC80416B2BE2E685C03195EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Shares, Acquisitions </link:label>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_F5A3A1D6E53C5EC98F37E685C031A014_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_F5A3A1D6E53C5EC98F37E685C031A014" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stock issued in connection with business acquisition, value </link:label>
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<link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_178F0114370C538D2CEEE685C0316F8C_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared_178F0114370C538D2CEEE685C0316F8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Dividends declared or paid </link:label>
<link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_178F0114370C538D2CEEE685C0316F8C_label_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared_178F0114370C538D2CEEE685C0316F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Dividends, Per Share, Declared </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_178F0114370C538D2CEEE685C0316F8C" xlink:type="locator"/>
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<link:label id="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0_terseLabel_en-US" xlink:label="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum exercise price of stock option, percentage </link:label>
<link:label id="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0_label_en-US" xlink:label="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum Exercise Price Of Stock Option Percent </link:label>
<link:label id="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0_documentation_en-US" xlink:label="lab_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Minimum exercise price of stock options expressed as a percentage of the fair market value of the Company’s common stock at grant date. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_MinimumExercisePriceOfStockOptionPercent" xlink:label="loc_calx_MinimumExercisePriceOfStockOptionPercent_BABC52DDA15E9C87F760E685C03191A0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_63D2E598CFD6B5717A92E685C03115AD" xlink:type="arc"/>
<link:label id="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A_terseLabel_en-US" xlink:label="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contractual term, stock options </link:label>
<link:label id="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A_label_en-US" xlink:label="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contractual Term, Stock Options </link:label>
<link:label id="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A_documentation_en-US" xlink:label="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Contractual Term, Stock Options </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ContractualTermStockOptions" xlink:label="loc_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:to="lab_calx_ContractualTermStockOptions_4669E7A855F7C2CFBAFDE685C031C36A" xlink:type="arc"/>
<link:label id="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3_terseLabel_en-US" xlink:label="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum shares allowed to be issued </link:label>
<link:label id="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3_label_en-US" xlink:label="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum Shares Allowed To Be Issued </link:label>
<link:label id="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3_documentation_en-US" xlink:label="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum Shares Allowed To Be Issued </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_MaximumSharesAllowedToBeIssued" xlink:label="loc_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:to="lab_calx_MaximumSharesAllowedToBeIssued_B7D728107448190AB27DE685C0311DF3" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Automatic annual increase of reserved shares </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod_FC2637FFB705580C86D8E685C032D23B" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting rights </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_B17BE3EC0D06C89BDFBCE685C032EF4C" xlink:type="arc"/>
<link:label id="lab_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Conversion basis description </link:label>
<link:label id="lab_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41_label_en-US" xlink:label="lab_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Conversion Basis </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockConversionBasis" xlink:label="loc_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41" xlink:to="lab_us-gaap_CommonStockConversionBasis_B09D28B6D1378EF39AFEE685C0324A41" xlink:type="arc"/>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B_terseLabel_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> RSU granted converted into common stock </link:label>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B_label_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted into Common Stock </link:label>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B_documentation_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted into Common Stock </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock" xlink:label="loc_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:to="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock_573897546796A45F90EEE685C032F23B" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7C48D5A3E4A2CEAA5E70E685C0325096_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7C48D5A3E4A2CEAA5E70E685C0325096" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Performance period, PRSU </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7C48D5A3E4A2CEAA5E70E685C0325096_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7C48D5A3E4A2CEAA5E70E685C0325096" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7C48D5A3E4A2CEAA5E70E685C0325096" xlink:type="locator"/>
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<link:label id="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79_terseLabel_en-US" xlink:label="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Target performance rate, PRSU </link:label>
<link:label id="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79_label_en-US" xlink:label="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Target Performance Rate </link:label>
<link:label id="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79_documentation_en-US" xlink:label="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Target Performance Rate </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_TargetPerformanceRate" xlink:label="loc_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:to="lab_calx_TargetPerformanceRate_A5C25EC668EAD5810B7AE685C032DA79" xlink:type="arc"/>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award vesting rights, percentage </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_D3A3B3C3BD84E6DDB4C9E685C032B8E4" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_592831BFC5FC9CDB06C2E685C032B114_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_592831BFC5FC9CDB06C2E685C032B114" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total intrinsic value for exercised stock options </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_592831BFC5FC9CDB06C2E685C032B114_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_592831BFC5FC9CDB06C2E685C032B114" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_592831BFC5FC9CDB06C2E685C032B114" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6759F5AB03AED506283CE685C0328A67_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6759F5AB03AED506283CE685C0328A67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total fair value of stock options vested </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6759F5AB03AED506283CE685C0328A67_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6759F5AB03AED506283CE685C0328A67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_6759F5AB03AED506283CE685C0328A67" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_84D79A393EEA9E613861E685C03219D5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_84D79A393EEA9E613861E685C03219D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair value of accelerated stock awards </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_84D79A393EEA9E613861E685C03219D5_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_84D79A393EEA9E613861E685C03219D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_84D79A393EEA9E613861E685C03219D5" xlink:type="locator"/>
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<link:label id="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762_terseLabel_en-US" xlink:label="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair value recognized for accelerated stock awards </link:label>
<link:label id="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762_label_en-US" xlink:label="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Expense Recognized </link:label>
<link:label id="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762_documentation_en-US" xlink:label="lab_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share Based Compensation Arrangement by Share Based Payment Award Plan Modification Incremental Expense Recognized in current period. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized" xlink:label="loc_calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized_DA08EBF80FD4E0E05195E685C0324762" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_DCB8F522823A8A0F2651E685C0327D2F_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_DCB8F522823A8A0F2651E685C0327D2F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> ESPP, maximum employee payroll deduction percentage </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_DCB8F522823A8A0F2651E685C0327D2F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_DCB8F522823A8A0F2651E685C0327D2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_DCB8F522823A8A0F2651E685C0327D2F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum number of shares employee can purchase during offering period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_3B91712AEC9934BA5890E685C0324771" xlink:type="arc"/>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4_verboseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> ESPP, discounted purchase price percentage </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_BDA447A2589A6E5CC9BBE685C0329CE4" xlink:type="arc"/>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E_terseLabel_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Offering period </link:label>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E_label_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Offering Period </link:label>
<link:label id="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E_documentation_en-US" xlink:label="lab_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Offering Period </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod" xlink:label="loc_calx_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePriceofCommonStockOfferingPeriod_9C8A641103281A0DEEFCE699AE02B36E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_77EF7700BFBD4F87CDC2E685C032DB61_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_77EF7700BFBD4F87CDC2E685C032DB61" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Shares authorized </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_77EF7700BFBD4F87CDC2E685C032DB61_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_77EF7700BFBD4F87CDC2E685C032DB61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_77EF7700BFBD4F87CDC2E685C032DB61" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_D026187763EDEC0D8A1CE685C0322BE0_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_D026187763EDEC0D8A1CE685C0322BE0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Shares issued in connection with Employee Stock Purchase Plan </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_D026187763EDEC0D8A1CE685C0322BE0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_D67010AF516850330124E685C0325A87_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_D67010AF516850330124E685C0325A87" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Shares available for future issuance under ESPP </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_D67010AF516850330124E685C0325A87" xlink:type="locator"/>
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<link:label id="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE_terseLabel_en-US" xlink:label="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent of historical volatility </link:label>
<link:label id="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE_label_en-US" xlink:label="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percent of Historical Volatility </link:label>
<link:label id="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE_documentation_en-US" xlink:label="lab_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Percent of Historical Volatility </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_PercentOfHistoricalVolatility" xlink:label="loc_calx_PercentOfHistoricalVolatility_CAAAE409E4FBF0089A81E685C03376DE" xlink:type="locator"/>
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<link:label id="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84_terseLabel_en-US" xlink:label="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent of implied volatility </link:label>
<link:label id="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84_label_en-US" xlink:label="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percent of Implied Volatility </link:label>
<link:label id="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84_documentation_en-US" xlink:label="lab_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Percent of Implied Volatility </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_PercentOfImpliedVolatility" xlink:label="loc_calx_PercentOfImpliedVolatility_3859905DAC5B0ACCBA2DE685C033BC84" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AEA231DF5B7A6F6A2788E685C0331C1E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AEA231DF5B7A6F6A2788E685C0331C1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock options granted, shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AEA231DF5B7A6F6A2788E685C0331C1E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_092C307BFC00EBF3CA96E685C0332A51_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_092C307BFC00EBF3CA96E685C0332A51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Awards granted, shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_092C307BFC00EBF3CA96E685C0332A51" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_092C307BFC00EBF3CA96E685C0332A51" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_092C307BFC00EBF3CA96E685C0332A51" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensation_CF566A33D41730A6A629E685C0338C8E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_CF566A33D41730A6A629E685C0338C8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate fair value of options and RSUs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_CF566A33D41730A6A629E685C0338C8E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_CF566A33D41730A6A629E685C0338C8E" xlink:to="lab_us-gaap_ShareBasedCompensation_CF566A33D41730A6A629E685C0338C8E" xlink:type="arc"/>
<link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Value of options in consideration for business combination </link:label>
<link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Consideration Transferred, Other </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredOther1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988" xlink:to="lab_us-gaap_BusinessCombinationConsiderationTransferredOther1_1320C28BB4B591D0A76AE685C0335988" xlink:type="arc"/>
<link:label id="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E_terseLabel_en-US" xlink:label="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Value of certain options and RSUs allocated to post-combination expense </link:label>
<link:label id="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E_label_en-US" xlink:label="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Post Combination Expense </link:label>
<link:label id="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E_documentation_en-US" xlink:label="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Portion of the aggregate fair value of stock-based awards granted to employees in connection with a business combination, which is allocated to post combination expense. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_PostCombinationExpense" xlink:label="loc_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:to="lab_calx_PostCombinationExpense_C0105ADE1E6018A7CFC0E685C033827E" xlink:type="arc"/>
<link:label id="lab_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Description of Business and Significant Accounting Policies </link:label>
<link:label id="lab_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42_label_en-US" xlink:label="lab_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Description and Accounting Policies [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42" xlink:to="lab_us-gaap_BusinessDescriptionAndAccountingPoliciesTextBlock_C47F29F603A3F029FA1FDEBE8D872D42" xlink:type="arc"/>
<link:label id="lab_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Company </link:label>
<link:label id="lab_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308_label_en-US" xlink:label="lab_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nature of Operations [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308" xlink:to="lab_us-gaap_NatureOfOperations_4120B101655C445CDF8219F087C82308" xlink:type="arc"/>
<link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis of Presentation </link:label>
<link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consolidation, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_F106ED8AC7EDB300130519F087C9E197" xlink:type="arc"/>
<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Applicable Accounting Guidance </link:label>
<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Basis of Accounting, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_0E99399B88BB3F03FC8B19F087CFD65D" xlink:type="arc"/>
<link:label id="lab_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of Estimates </link:label>
<link:label id="lab_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Use of Estimates, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995" xlink:to="lab_us-gaap_UseOfEstimates_BA3661539C9CF27A80DD19F087CF0995" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue Recognition </link:label>
<link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue Recognition, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3" xlink:to="lab_us-gaap_RevenueRecognitionPolicyTextBlock_DA7B9BDEB93D5CB177B619F087CFEBE3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of Revenue </link:label>
<link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96_label_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Sales, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfSalesPolicyTextBlock" xlink:label="loc_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96" xlink:to="lab_us-gaap_CostOfSalesPolicyTextBlock_77B919A2D7B53E5665B819F087CF5F96" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warranty </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StandardProductWarrantyPolicy" xlink:label="loc_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD" xlink:to="lab_us-gaap_StandardProductWarrantyPolicy_627B2213A1CE2AE8C0D219F087CF29DD" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-Based Compensation </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97" xlink:to="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_BF9C1CC89A5990DC0B7919F087CF6A97" xlink:type="arc"/>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Research and Development </link:label>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research and Development Expense, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ResearchAndDevelopmentExpensePolicy" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_5044528F965930A4B5A519F087D0E13E" xlink:type="arc"/>
<link:label id="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contingencies </link:label>
<link:label id="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommitmentsAndContingenciesPolicyTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE" xlink:to="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_24A7FB2E28222960206919F087D0E2DE" xlink:type="arc"/>
<link:label id="lab_us-gaap_LegalCostsPolicyTextBlock_B0AFF6807BA58BA3CE2B19F087D04B32_terseLabel_en-US" xlink:label="lab_us-gaap_LegalCostsPolicyTextBlock_B0AFF6807BA58BA3CE2B19F087D04B32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Legal Fees </link:label>
<link:label id="lab_us-gaap_LegalCostsPolicyTextBlock_B0AFF6807BA58BA3CE2B19F087D04B32_label_en-US" xlink:label="lab_us-gaap_LegalCostsPolicyTextBlock_B0AFF6807BA58BA3CE2B19F087D04B32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Legal Costs, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LegalCostsPolicyTextBlock" xlink:label="loc_us-gaap_LegalCostsPolicyTextBlock_B0AFF6807BA58BA3CE2B19F087D04B32" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_0D61C5952BF243558BF719F087D05B18_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_0D61C5952BF243558BF719F087D05B18" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Risk and Inventory Supplier Concentrations </link:label>
<link:label id="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_0D61C5952BF243558BF719F087D05B18_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_0D61C5952BF243558BF719F087D05B18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_1469DFC3C00ADAAC38E519F087D00A31_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_1469DFC3C00ADAAC38E519F087D00A31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value of Financial Instruments </link:label>
<link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_1469DFC3C00ADAAC38E519F087D00A31_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_1469DFC3C00ADAAC38E519F087D00A31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value of Financial Instruments, Policy [Policy Text Block] </link:label>
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<link:label id="lab_calx_CashCashEquivalentsAndMarketableSecuritiesPolicyPolicyTextBlockPolicyTextBlock_16D1A4C17FA9374C7DF219F087D0A17F_terseLabel_en-US" xlink:label="lab_calx_CashCashEquivalentsAndMarketableSecuritiesPolicyPolicyTextBlockPolicyTextBlock_16D1A4C17FA9374C7DF219F087D0A17F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, and Marketable Securities </link:label>
<link:label id="lab_calx_CashCashEquivalentsAndMarketableSecuritiesPolicyPolicyTextBlockPolicyTextBlock_16D1A4C17FA9374C7DF219F087D0A17F_label_en-US" xlink:label="lab_calx_CashCashEquivalentsAndMarketableSecuritiesPolicyPolicyTextBlockPolicyTextBlock_16D1A4C17FA9374C7DF219F087D0A17F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, and Marketable Securities, Policy [Policy Text Block] [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_InventoryPolicyTextBlock_3C1D8866A4A7CB1D672619F087D07A38_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_3C1D8866A4A7CB1D672619F087D07A38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventory </link:label>
<link:label id="lab_us-gaap_InventoryPolicyTextBlock_3C1D8866A4A7CB1D672619F087D07A38_label_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_3C1D8866A4A7CB1D672619F087D07A38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Policy [Policy Text Block] </link:label>
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<link:label id="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB_terseLabel_en-US" xlink:label="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred Revenue and Deferred Cost of Revenue </link:label>
<link:label id="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB_label_en-US" xlink:label="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Cost of Revenue [Policy Text Block] </link:label>
<link:label id="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB_documentation_en-US" xlink:label="lab_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Disclosure of the Company's policy on deferred cost of revenue. </link:label>
<link:loc xlink:href="calx-20151231.xsd#calx_DeferredCostOfRevenuePolicyTextBlock" xlink:label="loc_calx_DeferredCostOfRevenuePolicyTextBlock_A31D6861696BE243C7CB19F087D0CCEB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_0DB4F48A3E0FA2E4173319F087D08AEE_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_0DB4F48A3E0FA2E4173319F087D08AEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and Equipment </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_0DB4F48A3E0FA2E4173319F087D08AEE_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_0DB4F48A3E0FA2E4173319F087D08AEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_E99F1DFB934A74A0F73319F087D07B07_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_E99F1DFB934A74A0F73319F087D07B07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_E99F1DFB934A74A0F73319F087D07B07_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_E99F1DFB934A74A0F73319F087D07B07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_E99F1DFB934A74A0F73319F087D07B07" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_A6866497AA33E69D33E919F087D022E6_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_A6866497AA33E69D33E919F087D022E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible Assets and Other Long-Lived Assets </link:label>
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<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_D16529DCD20BBF199C8619F087D0692B_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_D16529DCD20BBF199C8619F087D0692B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_D16529DCD20BBF199C8619F087D0692B_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_D16529DCD20BBF199C8619F087D0692B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_84D284F90F4B9FAD036F19F087D071C7_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_84D284F90F4B9FAD036F19F087D071C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign Currency Translation </link:label>
<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_84D284F90F4B9FAD036F19F087D071C7_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_84D284F90F4B9FAD036F19F087D071C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Foreign Currency Transactions and Translations Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_28E2073E155B75D3424519F087D09B21_verboseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_28E2073E155B75D3424519F087D09B21" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Recent Accounting Pronouncements </link:label>
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<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_4620D4A3077E6EE6396EDEBE8E51EE08_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_4620D4A3077E6EE6396EDEBE8E51EE08" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of net loss per share </link:label>
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