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Calix, Inc – ‘10-Q’ for 9/30/17 – ‘EX-101.LAB’

On:  Wednesday, 11/8/17, at 5:24pm ET   ·   For:  9/30/17   ·   Accession #:  1406666-17-121   ·   File #:  1-34674

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

11/08/17  Calix, Inc                        10-Q        9/30/17   64:5.7M

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

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML    625K 
 2: EX-10.1     Material Contract                                   HTML    328K 
 3: EX-10.2     Material Contract                                   HTML     55K 
 4: EX-10.3     Material Contract                                   HTML     56K 
 5: EX-10.5     Material Contract                                   HTML     19K 
 6: EX-31.1     Certification -- §302 - SOA'02                      HTML     26K 
 7: EX-31.2     Certification -- §302 - SOA'02                      HTML     26K 
 8: EX-32.1     Certification -- §906 - SOA'02                      HTML     23K 
15: R1          Document and Entity Information                     HTML     37K 
16: R2          Condensed Consolidated Balance Sheets               HTML    105K 
17: R3          Condensed Consolidated Balance Sheets               HTML     39K 
                (Parenthetical)                                                  
18: R4          Condensed Consolidated Statements of Comprehensive  HTML    104K 
                Income (Loss) (Unaudited)                                        
19: R5          Condensed Consolidated Statements of Comprehensive  HTML     29K 
                Loss (Unaudited) (Parenthetical)                                 
20: R6          Condensed Consolidated Statements of Cash Flows     HTML    105K 
                (Unaudited)                                                      
21: R7          Company and Basis of Presentation                   HTML     29K 
22: R8          Significant Accounting Policies                     HTML     45K 
23: R9          Cash, Cash Equivalents and Marketable Securities    HTML     74K 
24: R10         Fair Value Measurements                             HTML     53K 
25: R11         Goodwill                                            HTML     23K 
26: R12         Balance Sheet Details                               HTML     85K 
27: R13         Commitments and Contingencies                       HTML     67K 
28: R14         Net Income (Loss) Per Common Share                  HTML     55K 
29: R15         Stockholders' Equity                                HTML     50K 
30: R16         Accumulated Other Comprehensive Loss                HTML     62K 
31: R17         Credit Facility                                     HTML     27K 
32: R18         Income Taxes                                        HTML     34K 
33: R19         Restructuring Charges                               HTML     32K 
34: R20         Significant Accounting Policies (Policies)          HTML     39K 
35: R21         Cash, Cash Equivalents and Marketable Securities    HTML     73K 
                (Tables)                                                         
36: R22         Fair Value Measurements (Tables)                    HTML     48K 
37: R23         Balance Sheet Details (Tables)                      HTML     95K 
38: R24         Commitments and Contingencies (Tables)              HTML     52K 
39: R25         Net Income (Loss) Per Common Share (Tables)         HTML     54K 
40: R26         Accumulated Other Comprehensive Loss (Tables)       HTML     61K 
41: R27         Income Taxes (Tables)                               HTML     32K 
42: R28         Restructuring Charges (Tables)                      HTML     30K 
43: R29         Significant Accounting Policies (Details)           HTML     25K 
44: R30         Cash, Cash Equivalents and Marketable Securities    HTML     41K 
                (Details)                                                        
45: R31         Cash, Cash Equivalents and Marketable Securities -  HTML     38K 
                Amortized Cost and Fair Value (Details)                          
46: R32         Fair Value Measurements (Details)                   HTML     54K 
47: R33         Goodwill (Details)                                  HTML     20K 
48: R34         Balance Sheet Details - Accounts Receivable         HTML     28K 
                (Details)                                                        
49: R35         Balance Sheet Details - Inventory (Details)         HTML     26K 
50: R36         Balance Sheet Details - Property and Equipment,     HTML     36K 
                net (Details)                                                    
51: R37         Balance Sheet Details - Accrued Liabilities         HTML     41K 
                (Details)                                                        
52: R38         Balance Sheet Details - Deferred Revenue (Details)  HTML     38K 
53: R39         Commitments and Contingencies - Textual (Details)   HTML     29K 
54: R40         Commitments and Contingencies - Operating Leases    HTML     46K 
                (Details)                                                        
55: R41         Commitments and Contingencies - Product Warranty    HTML     29K 
                Activities (Details)                                             
56: R42         Net Income (Loss) Per Common Share (Details)        HTML     42K 
57: R43         Stockholders' Equity (Details)                      HTML    117K 
58: R44         Accumulated Other Comprehensive Loss (Details)      HTML     35K 
59: R45         Credit Facility (Details)                           HTML     47K 
60: R46         Income Taxes (Details)                              HTML     24K 
61: R47         Restructuring Charges (Details)                     HTML     34K 
63: XML         IDEA XML File -- Filing Summary                      XML    105K 
62: EXCEL       IDEA Workbook of Financial Reports                  XLSX     63K 
 9: EX-101.INS  XBRL Instance -- calx-20170930                       XML   1.42M 
11: EX-101.CAL  XBRL Calculations -- calx-20170930_cal               XML    191K 
12: EX-101.DEF  XBRL Definitions -- calx-20170930_def                XML    316K 
13: EX-101.LAB  XBRL Labels -- calx-20170930_lab                     XML   1.06M 
14: EX-101.PRE  XBRL Presentations -- calx-20170930_pre              XML    584K 
10: EX-101.SCH  XBRL Schema -- calx-20170930                         XSD     96K 
64: ZIP         XBRL Zipped Folder -- 0001406666-17-000121-xbrl      Zip    145K

‘EX-101.LAB’   —   XBRL Labels — calx-20170930_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:label id="lab_us-gaap_AssetsAbstract_28AED177E4C7B27648AE4A32E711FAFE_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_28AED177E4C7B27648AE4A32E711FAFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_28AED177E4C7B27648AE4A32E711FAFE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsCurrentAbstract_7C436AAE0A44C9F31C7B4A32E7111B8E_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_7C436AAE0A44C9F31C7B4A32E7111B8E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Current assets: </link:label>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_7C436AAE0A44C9F31C7B4A32E7111B8E_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_7C436AAE0A44C9F31C7B4A32E7111B8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_7C436AAE0A44C9F31C7B4A32E7111B8E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, at Carrying Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_07D30253510094C89BDE4A32E711DC00" xlink:type="arc"/>
<link:label id="lab_us-gaap_MarketableSecuritiesCurrent_E73E02986FC8E96B41FC4A32E71170D8_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_E73E02986FC8E96B41FC4A32E71170D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Marketable securities </link:label>
<link:label id="lab_us-gaap_MarketableSecuritiesCurrent_E73E02986FC8E96B41FC4A32E71170D8_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_E73E02986FC8E96B41FC4A32E71170D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Marketable Securities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_E73E02986FC8E96B41FC4A32E71170D8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_D2B8B5E15311288C61634A32E711A562_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_D2B8B5E15311288C61634A32E711A562" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_D2B8B5E15311288C61634A32E711A562_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_D2B8B5E15311288C61634A32E711A562" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Net, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_D2B8B5E15311288C61634A32E711A562" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryNet_E81B16D5B7A50FE84F2F4A32E7113BD8_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_E81B16D5B7A50FE84F2F4A32E7113BD8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Inventory </link:label>
<link:label id="lab_us-gaap_InventoryNet_E81B16D5B7A50FE84F2F4A32E7113BD8_label_en-US" xlink:label="lab_us-gaap_InventoryNet_E81B16D5B7A50FE84F2F4A32E7113BD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net </link:label>
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<link:label id="lab_us-gaap_DeferredCostsCurrent_6D190F6D30D8284AD00F4A32E7117EC5_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredCostsCurrent_6D190F6D30D8284AD00F4A32E7117EC5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred cost of revenue </link:label>
<link:label id="lab_us-gaap_DeferredCostsCurrent_6D190F6D30D8284AD00F4A32E7117EC5_label_en-US" xlink:label="lab_us-gaap_DeferredCostsCurrent_6D190F6D30D8284AD00F4A32E7117EC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Costs, Current </link:label>
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<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_86B2CA57B9D050A58D734A32E711041F_verboseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_86B2CA57B9D050A58D734A32E711041F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other current assets </link:label>
<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_86B2CA57B9D050A58D734A32E711041F_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_86B2CA57B9D050A58D734A32E711041F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Expense and Other Assets, Current </link:label>
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<link:label id="lab_us-gaap_AssetsCurrent_0393857D393F60F4D2034A32E71277A0_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_0393857D393F60F4D2034A32E71277A0" 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_0393857D393F60F4D2034A32E71277A0_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_0393857D393F60F4D2034A32E71277A0" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_0393857D393F60F4D2034A32E71277A0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56" 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_C861326B298EEFC663FB4A32E712CA56_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_C861326B298EEFC663FB4A32E712CA56" xlink:type="arc"/>
<link:label id="lab_us-gaap_Goodwill_CB31B0D4B971A0EB51494A32E712E16D_verboseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_CB31B0D4B971A0EB51494A32E712E16D" 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_CB31B0D4B971A0EB51494A32E712E16D_label_en-US" xlink:label="lab_us-gaap_Goodwill_CB31B0D4B971A0EB51494A32E712E16D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_4DD685C21F5D41597A254A32E712B89B_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_4DD685C21F5D41597A254A32E712B89B" 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_4DD685C21F5D41597A254A32E712B89B_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_4DD685C21F5D41597A254A32E712B89B" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_4DD685C21F5D41597A254A32E712B89B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37" 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_B1D7FD665745DAFC5D694A32E7127E37_label_en-US" xlink:label="lab_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37" xlink:to="lab_us-gaap_Assets_B1D7FD665745DAFC5D694A32E7127E37" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_B4F23D58E009BC3E0BDA4A32E7124849_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_B4F23D58E009BC3E0BDA4A32E7124849" 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_B4F23D58E009BC3E0BDA4A32E7124849_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_B4F23D58E009BC3E0BDA4A32E7124849" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_B4F23D58E009BC3E0BDA4A32E7124849" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_E352D2DF5517D2E018EA4A32E7125F76_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E352D2DF5517D2E018EA4A32E7125F76" 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_E352D2DF5517D2E018EA4A32E7125F76_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E352D2DF5517D2E018EA4A32E7125F76" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_E352D2DF5517D2E018EA4A32E7125F76" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableCurrent_CA4AD195766082B68E114A32E71281F2_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_CA4AD195766082B68E114A32E71281F2" 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_CA4AD195766082B68E114A32E71281F2_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_CA4AD195766082B68E114A32E71281F2" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_CA4AD195766082B68E114A32E71281F2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_948099F92D7A84F546FA4A32E7121A83_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_948099F92D7A84F546FA4A32E7121A83" 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_AccruedLiabilitiesCurrent_948099F92D7A84F546FA4A32E7121A83_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_948099F92D7A84F546FA4A32E7121A83" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_948099F92D7A84F546FA4A32E7121A83" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredRevenueCurrent_6513E28510E0766C42F74A32E712DA18_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_6513E28510E0766C42F74A32E712DA18" 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_6513E28510E0766C42F74A32E712DA18_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_6513E28510E0766C42F74A32E712DA18" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_6513E28510E0766C42F74A32E712DA18" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LinesOfCreditCurrent_DF71B4DE983BFBCEA3104A32E71268FD_terseLabel_en-US" xlink:label="lab_us-gaap_LinesOfCreditCurrent_DF71B4DE983BFBCEA3104A32E71268FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of credit </link:label>
<link:label id="lab_us-gaap_LinesOfCreditCurrent_DF71B4DE983BFBCEA3104A32E71268FD_label_en-US" xlink:label="lab_us-gaap_LinesOfCreditCurrent_DF71B4DE983BFBCEA3104A32E71268FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LinesOfCreditCurrent" xlink:label="loc_us-gaap_LinesOfCreditCurrent_DF71B4DE983BFBCEA3104A32E71268FD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD" 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_C914A79DAB38F7FC47044A32E71263CD_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD" xlink:to="lab_us-gaap_LiabilitiesCurrent_C914A79DAB38F7FC47044A32E71263CD" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueNoncurrent_06E6AF3B33F50399FB914A32E712C12A_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_06E6AF3B33F50399FB914A32E712C12A" 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_06E6AF3B33F50399FB914A32E712C12A_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_06E6AF3B33F50399FB914A32E712C12A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_06E6AF3B33F50399FB914A32E712C12A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_7DE67C36958F20E9069F4A32E712A089_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_7DE67C36958F20E9069F4A32E712A089" 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_7DE67C36958F20E9069F4A32E712A089_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_7DE67C36958F20E9069F4A32E712A089" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_7DE67C36958F20E9069F4A32E712A089" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Liabilities_4910057BEC92D7866E4F4A32E712EB48_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_4910057BEC92D7866E4F4A32E712EB48" 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_4910057BEC92D7866E4F4A32E712EB48_label_en-US" xlink:label="lab_us-gaap_Liabilities_4910057BEC92D7866E4F4A32E712EB48" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_4910057BEC92D7866E4F4A32E712EB48" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingencies_59A90F578D5C00780C024A32E712EF40_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_59A90F578D5C00780C024A32E712EF40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies </link:label>
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<link:label id="lab_us-gaap_StockholdersEquityAbstract_5A7F28B7429E2245081A4A32E71272DB_verboseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_5A7F28B7429E2245081A4A32E71272DB" 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_5A7F28B7429E2245081A4A32E71272DB_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_5A7F28B7429E2245081A4A32E71272DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Attributable to Parent [Abstract] </link:label>
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<link:label id="lab_us-gaap_PreferredStockValue_4AFFAF3A68441C3C82BC4A32E713DBAC_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_4AFFAF3A68441C3C82BC4A32E713DBAC" 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_PaymentsForRestructuring_0C80D2027FFC9626676CC98B39AF7DB2_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_0C80D2027FFC9626676CC98B39AF7DB2" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Cash payments </link:label>
<link:label id="lab_us-gaap_PaymentsForRestructuring_0C80D2027FFC9626676CC98B39AF7DB2_label_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_0C80D2027FFC9626676CC98B39AF7DB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for Restructuring </link:label>
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<link:label id="lab_us-gaap_RestructuringReserve_AD234EE9BA8E6EFBB80FC98B39AFC1EA_periodEndLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserve_AD234EE9BA8E6EFBB80FC98B39AFC1EA" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Liability at end of period </link:label>
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<link:label id="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_C1D4479F30C74E182125C98B39AFC5F0_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_C1D4479F30C74E182125C98B39AFC5F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Cost, Expected Cost </link:label>
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<link:label id="lab_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_266979FA6B2D41B3FDFFC98B39AFD03F_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_266979FA6B2D41B3FDFFC98B39AFD03F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Cost, Expected Cost Remaining </link:label>
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<link:label id="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_2A68B95734DBBE19F0CAC98B39F4F168_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_2A68B95734DBBE19F0CAC98B39F4F168" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Costs </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrentAbstract" xlink:label="loc_us-gaap_AccountsReceivableNetCurrentAbstract_E83A32A68D6592F3D534C98B38EFAD50" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_05A5E4A7D7E3386C73AAC98B38EF0CC0_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_05A5E4A7D7E3386C73AAC98B38EF0CC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Gross, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_05A5E4A7D7E3386C73AAC98B38EF0CC0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9CB614BE1AFCFD1AC289C98B38F0F3E0_negatedLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9CB614BE1AFCFD1AC289C98B38F0F3E0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Allowance for doubtful accounts </link:label>
<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9CB614BE1AFCFD1AC289C98B38F0F3E0_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9CB614BE1AFCFD1AC289C98B38F0F3E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Allowance for Doubtful Accounts Receivable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9CB614BE1AFCFD1AC289C98B38F0F3E0" xlink:type="locator"/>
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<link:label id="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD_negatedLabel_en-US" xlink:label="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Product return reserve </link:label>
<link:label id="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD_label_en-US" xlink:label="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Return Reserve </link:label>
<link:label id="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD_documentation_en-US" xlink:label="lab_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> A valuation allowance for the amount of products sold that the entity expects to be returned by the purchaser. </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_ProductReturnReserve" xlink:label="loc_calx_ProductReturnReserve_6A9CFEC67D988244CE1EC98B38F0C9BD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_9C1C5A7036DFA2C1F1B7C98B38F076FD_totalLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_9C1C5A7036DFA2C1F1B7C98B38F076FD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_9C1C5A7036DFA2C1F1B7C98B38F076FD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAbstract_264C24C819EA092E5C06C98B38F56459_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAbstract_264C24C819EA092E5C06C98B38F56459" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract" xlink:label="loc_us-gaap_CashAndCashEquivalentsAbstract_264C24C819EA092E5C06C98B38F56459" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3BD7A24026D6960A00B1C98B38E8CD3B_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3BD7A24026D6960A00B1C98B38E8CD3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3BD7A24026D6960A00B1C98B38E8CD3B_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3BD7A24026D6960A00B1C98B38E8CD3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> AOCI Attributable to Parent [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3BD7A24026D6960A00B1C98B38E8CD3B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_9F9FF78DA56DE82300AFC98B38E8E3C3_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_9F9FF78DA56DE82300AFC98B38E8E3C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Loss [Line Items] </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_9F9FF78DA56DE82300AFC98B38E8E3C3_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_9F9FF78DA56DE82300AFC98B38E8E3C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss) [Line Items] </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A54A4ED223CB561179FFC98B38E8EF40_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A54A4ED223CB561179FFC98B38E8EF40" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Loss [Roll Forward] </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A54A4ED223CB561179FFC98B38E8EF40_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A54A4ED223CB561179FFC98B38E8EF40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_A54A4ED223CB561179FFC98B38E8EF40" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquity_9F6218B700A883F60011C98B38E83BAA_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_9F6218B700A883F60011C98B38E83BAA" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Balance at beginning of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_9F6218B700A883F60011C98B38E83BAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A7881A1828DFA104D40BC98B38E8968D_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A7881A1828DFA104D40BC98B38E8968D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss) </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A7881A1828DFA104D40BC98B38E8968D_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A7881A1828DFA104D40BC98B38E8968D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent </link:label>
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<link:label id="lab_us-gaap_StockholdersEquity_538B5978AF1EC545A6DEC98B38E8315A_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_538B5978AF1EC545A6DEC98B38E8315A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_538B5978AF1EC545A6DEC98B38E8315A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_25022AF65AFC065376CCC98B38EC40EB_verboseLabel_en-US" xlink:label="lab_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_25022AF65AFC065376CCC98B38EC40EB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Product warranty activities [Roll Forward] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward" xlink:label="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_25022AF65AFC065376CCC98B38EC40EB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductWarrantyAccrual_BF6B7F1346787AF44A06C98B38EC9F96_periodStartLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_BF6B7F1346787AF44A06C98B38EC9F96" 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_BF6B7F1346787AF44A06C98B38EC9F96_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_BF6B7F1346787AF44A06C98B38EC9F96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard and Extended Product Warranty Accrual </link:label>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_C065175E94F4DF476295C98B38ED7F06_verboseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_C065175E94F4DF476295C98B38ED7F06" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Provision for warranty and retrofit charged to cost of revenue </link:label>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualPayments_665D3F1BC27B7F706567C98B38ED80D7_negatedLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPayments_665D3F1BC27B7F706567C98B38ED80D7" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Utilization of reserve </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualPayments_665D3F1BC27B7F706567C98B38ED80D7_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPayments_665D3F1BC27B7F706567C98B38ED80D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard and Extended Product Warranty Accrual, Decrease for Payments </link:label>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_509B7F2542A4EF203AF9C98B38ED86D8_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_509B7F2542A4EF203AF9C98B38ED86D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to pre-existing reserve </link:label>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_9076831B904542771BF054387A389A27_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_9076831B904542771BF054387A389A27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets Disclosure [Abstract] </link:label>
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<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_7EA584A966771CE62C0E54387A3C2D58_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_7EA584A966771CE62C0E54387A3C2D58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill impairment </link:label>
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<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_CD973EABC55BED41B1B6543427EE5200_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_CD973EABC55BED41B1B6543427EE5200" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [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_StatementOfCashFlowsAbstract_CD973EABC55BED41B1B6543427EE5200" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_CD973EABC55BED41B1B6543427EE5200" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732" 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_8B9333DA495FDD184EE0543427EEF732_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_8B9333DA495FDD184EE0543427EEF732" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407_verboseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Net loss </link:label>
<link:label id="lab_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407_label_en-US" xlink:label="lab_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Income (Loss), Including Portion Attributable to Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407" xlink:to="lab_us-gaap_ProfitLoss_A841767635951C48E465543427EFD407" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3" 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_6EDC8D36CB01D3A57453543427EF94F3_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6EDC8D36CB01D3A57453543427EF94F3" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6" 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_002DEF3B7EC90FDC2BFB543427EF01F6_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6" xlink:to="lab_us-gaap_ShareBasedCompensation_002DEF3B7EC90FDC2BFB543427EF01F6" xlink:type="arc"/>
<link:label id="lab_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE_verboseLabel_en-US" xlink:label="lab_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>
<link:label id="lab_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE_label_en-US" xlink:label="lab_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE" xlink:to="lab_us-gaap_Depreciation_DF4E5FD214DE83DD3E58543427EF04AE" xlink:type="arc"/>
<link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D_verboseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D" 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_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D_label_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Intangible Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D" xlink:to="lab_us-gaap_AmortizationOfIntangibleAssets_DE05D5FB0EC659F3FFBB543427EFD95D" xlink:type="arc"/>
<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0" 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_C883BA215105541F6E44543427EF31D0_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0" xlink:to="lab_us-gaap_GainLossOnDispositionOfAssets_C883BA215105541F6E44543427EF31D0" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of premium (discount) related to available-for-sale securities </link:label>
<link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509_label_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509" xlink:to="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_C73D1FE606D14CD008C5543427EF3509" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1" 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_92856396D1C8F1E4D3A3543427F01BF1_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_92856396D1C8F1E4D3A3543427F01BF1" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D" 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_E3551CE552C8BE3F3AF2543427F0CA6D_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E3551CE552C8BE3F3AF2543427F0CA6D" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_D5325661ECEA4BEE3927543427F0519D_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_D5325661ECEA4BEE3927543427F0519D" 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_D5325661ECEA4BEE3927543427F0519D_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_D5325661ECEA4BEE3927543427F0519D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_D5325661ECEA4BEE3927543427F0519D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredCharges_5A49F1659C0757A895FA543427F056C6_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_5A49F1659C0757A895FA543427F056C6" 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_5A49F1659C0757A895FA543427F056C6_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_5A49F1659C0757A895FA543427F056C6" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCharges" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCharges_5A49F1659C0757A895FA543427F056C6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1E9E2B5E2DD71686CF72543427F04F85_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1E9E2B5E2DD71686CF72543427F04F85" 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_1E9E2B5E2DD71686CF72543427F04F85_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1E9E2B5E2DD71686CF72543427F04F85" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1E9E2B5E2DD71686CF72543427F04F85" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_F4525951669EBF250C2F543427F08533_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_F4525951669EBF250C2F543427F08533" 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_IncreaseDecreaseInAccountsPayable_F4525951669EBF250C2F543427F08533_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_F4525951669EBF250C2F543427F08533" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Payable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_F4525951669EBF250C2F543427F08533" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_87C4C401F6AD7442FBDA543427F01E88_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_87C4C401F6AD7442FBDA543427F01E88" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_365B1406D34A02A1ACBE543427F1272D_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_365B1406D34A02A1ACBE543427F1272D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other long-term liabilities </link:label>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_921388ABF848C5CCD4F7543427F266DF_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_921388ABF848C5CCD4F7543427F266DF" 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>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_B8E3ACBB5B8BE3C4F1E8543427F29A69_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_B8E3ACBB5B8BE3C4F1E8543427F29A69" 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_B8E3ACBB5B8BE3C4F1E8543427F29A69_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_B8E3ACBB5B8BE3C4F1E8543427F29A69" 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:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ED67528913BF729D1A39543427F24818_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ED67528913BF729D1A39543427F24818" 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_ED67528913BF729D1A39543427F24818_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ED67528913BF729D1A39543427F24818" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ED67528913BF729D1A39543427F24818" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_4F4D33F23CEE691E15A3543427F2C0EB_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_4F4D33F23CEE691E15A3543427F2C0EB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Purchases of marketable securities </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_4F4D33F23CEE691E15A3543427F2C0EB_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_4F4D33F23CEE691E15A3543427F2C0EB" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireMarketableSecurities_4F4D33F23CEE691E15A3543427F2C0EB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A" 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_3476A20224D4E9E780FC543427F2A13A_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A" 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>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A" xlink:to="lab_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_3476A20224D4E9E780FC543427F2A13A" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maturities of marketable securities </link:label>
<link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42_label_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42" xlink:to="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_5C3B919168D46E6EFD50543427F3DC42" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_34C1337ACB95E051C5FF543427F3B867_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_34C1337ACB95E051C5FF543427F3B867" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by investing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_34C1337ACB95E051C5FF543427F3B867_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_34C1337ACB95E051C5FF543427F3B867" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1D0E2F361C9F71849E4E543427F3BDBC_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1D0E2F361C9F71849E4E543427F3BDBC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Financing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1D0E2F361C9F71849E4E543427F3BDBC_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1D0E2F361C9F71849E4E543427F3BDBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
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<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_130C205780E7BA1A9A23543427F3D2B4_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_130C205780E7BA1A9A23543427F3D2B4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from exercise of stock options </link:label>
<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_130C205780E7BA1A9A23543427F3D2B4_label_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_130C205780E7BA1A9A23543427F3D2B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Stock Options Exercised </link:label>
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<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_86D69C093921D0C80E0A543427F3C038_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_86D69C093921D0C80E0A543427F3C038" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from employee stock purchase plan </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_86D69C093921D0C80E0A543427F3C038_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_86D69C093921D0C80E0A543427F3C038" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options </link:label>
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<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_DF0BC27B4E1AD5AC636F543427F397DA_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_DF0BC27B4E1AD5AC636F543427F397DA" 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_E825DAB16D6FE6BADCAC543427F30F8C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Taxes paid for awards vested under equity incentive plan </link:label>
<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments Related to Tax Withholding for Share-based Compensation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_E825DAB16D6FE6BADCAC543427F30F8C" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from line of credit </link:label>
<link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Lines of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D" xlink:to="lab_us-gaap_ProceedsFromLinesOfCredit_5EFC366AE024063517F3543427F41C0D" xlink:type="arc"/>
<link:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repayment of line of credit </link:label>
<link:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Lines of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416" xlink:to="lab_us-gaap_RepaymentsOfLinesOfCredit_9DBCDE69220E6A7D5362543427F4F416" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Payments to originate the line of credit </link:label>
<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_E1909C50D8FBD74F680A543427F406AB" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276" 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>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A695300A7742825E2D46543427F47276" xlink:type="arc"/>
<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3_verboseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3" 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>
<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3_label_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effect of Exchange Rate on Cash and Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3" xlink:to="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_225A0B87BAFA0C8140CD543427F40AE3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net increase in cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, Period Increase (Decrease) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7" xlink:to="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_E6A3AE52F3B555E4A4B0543427F488A7" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_EF36432FFF3823E37E52543427F4A38E_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_EF36432FFF3823E37E52543427F4A38E" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents at beginning of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_EF36432FFF3823E37E52543427F4A38E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_EF36432FFF3823E37E52543427F4A38E" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_EF36432FFF3823E37E52543427F4A38E" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_645B17062E9779DAED8B543427F45DDE_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_645B17062E9779DAED8B543427F45DDE" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents at end of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_645B17062E9779DAED8B543427F45DDE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_645B17062E9779DAED8B543427F45DDE" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_645B17062E9779DAED8B543427F45DDE" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8" 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_60CF27800D84243ABF630CD7648D71A8_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_60CF27800D84243ABF630CD7648D71A8" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19" 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_7F9FF21C72DA84F9E75B0CD7648D3E19_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7F9FF21C72DA84F9E75B0CD7648D3E19" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_0D1716FEB47BE449B3150CD7648E9280_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_0D1716FEB47BE449B3150CD7648E9280" 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_0D1716FEB47BE449B3150CD7648E9280_label_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_0D1716FEB47BE449B3150CD7648E9280" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="loc_us-gaap_AccruedProfessionalFeesCurrent_0D1716FEB47BE449B3150CD7648E9280" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_123B7C9710D36532692A0CD7648E3407_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_123B7C9710D36532692A0CD7648E3407" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued warranty and retrofit </link:label>
<link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_123B7C9710D36532692A0CD7648E3407_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_123B7C9710D36532692A0CD7648E3407" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_123B7C9710D36532692A0CD7648E3407" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CustomerAdvancesCurrent_62185B3A97B2A5BFCE730CD7648EC857_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_62185B3A97B2A5BFCE730CD7648EC857" 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_62185B3A97B2A5BFCE730CD7648EC857_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_62185B3A97B2A5BFCE730CD7648EC857" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerAdvancesCurrent" xlink:label="loc_us-gaap_CustomerAdvancesCurrent_62185B3A97B2A5BFCE730CD7648EC857" xlink:type="locator"/>
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<link:label id="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_D9C317FF2522BEAE4B010CD7648EE3AC_verboseLabel_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_D9C317FF2522BEAE4B010CD7648EE3AC" 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_D9C317FF2522BEAE4B010CD7648EE3AC_label_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_D9C317FF2522BEAE4B010CD7648EE3AC" 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_D9C317FF2522BEAE4B010CD7648EE3AC_documentation_en-US" xlink:label="lab_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_D9C317FF2522BEAE4B010CD7648EE3AC" 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-20170930.xsd#calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer" xlink:label="loc_calx_AccruedExcessAndObsoleteInventoryAtContractManufacturer_D9C317FF2522BEAE4B010CD7648EE3AC" xlink:type="locator"/>
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<link:label id="lab_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE_verboseLabel_en-US" xlink:label="lab_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accrued customer rebates </link:label>
<link:label id="lab_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE_label_en-US" xlink:label="lab_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE" 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_19F995CA46EE1629AD4E0CD7648E14CE_documentation_en-US" xlink:label="lab_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE" 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-20170930.xsd#calx_AccruedCustomerRebates" xlink:label="loc_calx_AccruedCustomerRebates_19F995CA46EE1629AD4E0CD7648E14CE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringReserveCurrent_6961AC4ECA8F5C00320B0CD7648EF96D_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveCurrent_6961AC4ECA8F5C00320B0CD7648EF96D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued restructuring charges </link:label>
<link:label id="lab_us-gaap_RestructuringReserveCurrent_6961AC4ECA8F5C00320B0CD7648EF96D_label_en-US" xlink:label="lab_us-gaap_RestructuringReserveCurrent_6961AC4ECA8F5C00320B0CD7648EF96D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringReserveCurrent" xlink:label="loc_us-gaap_RestructuringReserveCurrent_6961AC4ECA8F5C00320B0CD7648EF96D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_7EE197620D8BCB15ED970CD7648ECAED_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_7EE197620D8BCB15ED970CD7648ECAED" 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_7EE197620D8BCB15ED970CD7648ECAED_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_7EE197620D8BCB15ED970CD7648ECAED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Accrued Liabilities, Current </link:label>
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<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_34F3F4C9AE9C74148C7A0CD7648E793F_totalLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_34F3F4C9AE9C74148C7A0CD7648E793F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total accrued liabilities </link:label>
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<link:label id="lab_us-gaap_IncomeStatementAbstract_EB83CAD8E724C2EEADF50865960BD7A3_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_EB83CAD8E724C2EEADF50865960BD7A3" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_EB83CAD8E724C2EEADF50865960BD7A3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462" 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_C5ED0823DD499A8993330865960BB462_label_en-US" xlink:label="lab_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462" xlink:to="lab_us-gaap_StatementTable_C5ED0823DD499A8993330865960BB462" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeStatementLocationAxis_7A23CFA9043F224C79B70865960BB58A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_7A23CFA9043F224C79B70865960BB58A" 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_7A23CFA9043F224C79B70865960BB58A_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_7A23CFA9043F224C79B70865960BB58A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7A23CFA9043F224C79B70865960BB58A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeStatementLocationDomain_52CAF1D3C00E6E0E20900865960B1803_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_52CAF1D3C00E6E0E20900865960B1803" 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_52CAF1D3C00E6E0E20900865960B1803_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_52CAF1D3C00E6E0E20900865960B1803" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_52CAF1D3C00E6E0E20900865960B1803" xlink:type="locator"/>
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<link:label id="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690_terseLabel_en-US" xlink:label="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Products </link:label>
<link:label id="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690_label_en-US" xlink:label="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost Of Revenue, Systems [Member] </link:label>
<link:label id="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690_documentation_en-US" xlink:label="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Cost Of Revenue, Systems [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_CostOfRevenueSystemsMember" xlink:label="loc_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:to="lab_calx_CostOfRevenueSystemsMember_F619C33805A3A022FF090865960BF690" xlink:type="arc"/>
<link:label id="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37_terseLabel_en-US" xlink:label="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Services </link:label>
<link:label id="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37_label_en-US" xlink:label="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost Of Revenue, Services [Member] </link:label>
<link:label id="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37_documentation_en-US" xlink:label="lab_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Cost Of Revenue, Services [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_CostOfRevenueServicesMember" xlink:label="loc_calx_CostOfRevenueServicesMember_FFCAC78F0B85F28031600865960BED37" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ResearchAndDevelopmentExpenseMember_8CC1D0307E9FC928365F0865960B1335_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_8CC1D0307E9FC928365F0865960B1335" 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_8CC1D0307E9FC928365F0865960B1335_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_8CC1D0307E9FC928365F0865960B1335" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_8CC1D0307E9FC928365F0865960B1335" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SellingAndMarketingExpenseMember_7E9D59E55F98F85E6BFE0865960C868A_terseLabel_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpenseMember_7E9D59E55F98F85E6BFE0865960C868A" 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_7E9D59E55F98F85E6BFE0865960C868A_label_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpenseMember_7E9D59E55F98F85E6BFE0865960C868A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_7E9D59E55F98F85E6BFE0865960C868A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GeneralAndAdministrativeExpenseMember_0058F05230AD2C1A04D80865960C8522_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpenseMember_0058F05230AD2C1A04D80865960C8522" 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_0058F05230AD2C1A04D80865960C8522_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpenseMember_0058F05230AD2C1A04D80865960C8522" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_0058F05230AD2C1A04D80865960C8522" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementLineItems_DBE509F00CD9C1752F7F0865960CBBD9_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_DBE509F00CD9C1752F7F0865960CBBD9" 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_DBE509F00CD9C1752F7F0865960CBBD9_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_DBE509F00CD9C1752F7F0865960CBBD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
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<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_0870A651558A059DE8FF0865960CFD27_verboseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_0870A651558A059DE8FF0865960CFD27" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
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<link:label id="lab_us-gaap_LossContingenciesTable_B2781ACD8576DF8E0D74917069490FE5_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_B2781ACD8576DF8E0D74917069490FE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Table] </link:label>
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<link:label id="lab_us-gaap_RangeAxis_091571B8735CDA02160A917069491114_label_en-US" xlink:label="lab_us-gaap_RangeAxis_091571B8735CDA02160A917069491114" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Range [Axis] </link:label>
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<link:label id="lab_us-gaap_RangeMember_019F3F7A34ABCA87D3FE91706949C4B6_terseLabel_en-US" xlink:label="lab_us-gaap_RangeMember_019F3F7A34ABCA87D3FE91706949C4B6" 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_019F3F7A34ABCA87D3FE91706949C4B6_label_en-US" xlink:label="lab_us-gaap_RangeMember_019F3F7A34ABCA87D3FE91706949C4B6" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_019F3F7A34ABCA87D3FE91706949C4B6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_MinimumMember_A6F12AE90D9721642A3291706949963B_verboseLabel_en-US" xlink:label="lab_us-gaap_MinimumMember_A6F12AE90D9721642A3291706949963B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Minimum </link:label>
<link:label id="lab_us-gaap_MinimumMember_A6F12AE90D9721642A3291706949963B_label_en-US" xlink:label="lab_us-gaap_MinimumMember_A6F12AE90D9721642A3291706949963B" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_A6F12AE90D9721642A3291706949963B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556_verboseLabel_en-US" xlink:label="lab_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Maximum </link:label>
<link:label id="lab_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556_label_en-US" xlink:label="lab_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556" xlink:to="lab_us-gaap_MaximumMember_800D998F547F7D497AFB917069497556" xlink:type="arc"/>
<link:label id="lab_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies [Line Items] </link:label>
<link:label id="lab_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116" xlink:to="lab_us-gaap_LossContingenciesLineItems_9F260A53A9736E7E876091706949E116" xlink:type="arc"/>
<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BBAA3749CD8B30D4A9699189D2335B51_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BBAA3749CD8B30D4A9699189D2335B51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding purchase commitments </link:label>
<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BBAA3749CD8B30D4A9699189D2335B51_label_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BBAA3749CD8B30D4A9699189D2335B51" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted" xlink:label="loc_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BBAA3749CD8B30D4A9699189D2335B51" xlink:type="locator"/>
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<link:label id="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6_verboseLabel_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Warranty period </link:label>
<link:label id="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6_label_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" 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_638EB49203BF804079A79170694ACCA6_documentation_en-US" xlink:label="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" 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-20170930.xsd#calx_ProductWarrantyPeriod" xlink:label="loc_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" xlink:to="lab_calx_ProductWarrantyPeriod_638EB49203BF804079A79170694ACCA6" xlink:type="arc"/>
<link:label id="lab_us-gaap_PreferredStockParOrStatedValuePerShare_3679051F06EF82FA7EC1C98B39B7C39A_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockParOrStatedValuePerShare_3679051F06EF82FA7EC1C98B39B7C39A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, par value (in dollars per share) </link:label>
<link:label id="lab_us-gaap_PreferredStockParOrStatedValuePerShare_3679051F06EF82FA7EC1C98B39B7C39A_label_en-US" xlink:label="lab_us-gaap_PreferredStockParOrStatedValuePerShare_3679051F06EF82FA7EC1C98B39B7C39A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Par or Stated Value Per Share </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_3679051F06EF82FA7EC1C98B39B7C39A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesAuthorized_EEF1974677F7D750062AC98B39B7393D_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized_EEF1974677F7D750062AC98B39B7393D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares authorized </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesAuthorized_EEF1974677F7D750062AC98B39B7393D_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized_EEF1974677F7D750062AC98B39B7393D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Authorized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_EEF1974677F7D750062AC98B39B7393D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesIssued_CF33DFBC1F520AFA1F29C98B39B76666_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_CF33DFBC1F520AFA1F29C98B39B76666" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares issued </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesIssued_CF33DFBC1F520AFA1F29C98B39B76666_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_CF33DFBC1F520AFA1F29C98B39B76666" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_CF33DFBC1F520AFA1F29C98B39B76666" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesOutstanding_8AD0251F31A5AEE13E37C98B39B739A7_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesOutstanding_8AD0251F31A5AEE13E37C98B39B739A7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares outstanding </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesOutstanding_8AD0251F31A5AEE13E37C98B39B739A7_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesOutstanding_8AD0251F31A5AEE13E37C98B39B739A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Outstanding </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_8AD0251F31A5AEE13E37C98B39B739A7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_79EA7E9710FD4DAD7759C98B39B8A0E0_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_79EA7E9710FD4DAD7759C98B39B8A0E0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, par value (in dollars per share) </link:label>
<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_79EA7E9710FD4DAD7759C98B39B8A0E0_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_79EA7E9710FD4DAD7759C98B39B8A0E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Par or Stated Value Per Share </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_79EA7E9710FD4DAD7759C98B39B8A0E0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockSharesAuthorized_D4646C2A06DFAEC81977C98B39B8BFB2_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_D4646C2A06DFAEC81977C98B39B8BFB2" 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_D4646C2A06DFAEC81977C98B39B8BFB2_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_D4646C2A06DFAEC81977C98B39B8BFB2" 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_6EBC438BBF51A9204F41C98B39B8AF6A_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_6EBC438BBF51A9204F41C98B39B8AF6A" 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_6EBC438BBF51A9204F41C98B39B8AF6A_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_6EBC438BBF51A9204F41C98B39B8AF6A" 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_EAE7CD22DF36180536A7C98B39B8A4ED_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_EAE7CD22DF36180536A7C98B39B8A4ED" 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_EAE7CD22DF36180536A7C98B39B8A4ED_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_EAE7CD22DF36180536A7C98B39B8A4ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Outstanding </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_EAE7CD22DF36180536A7C98B39B8A4ED" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TreasuryStockShares_58408D2F77EEF9690D2CC98B39B8A6C9_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_58408D2F77EEF9690D2CC98B39B8A6C9" 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_58408D2F77EEF9690D2CC98B39B8A6C9_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_58408D2F77EEF9690D2CC98B39B8A6C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_58408D2F77EEF9690D2CC98B39B8A6C9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryNetAbstract_133BB3030D7E60405473C98B39C69D51_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_133BB3030D7E60405473C98B39C69D51" 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_133BB3030D7E60405473C98B39C69D51_label_en-US" xlink:label="lab_us-gaap_InventoryNetAbstract_133BB3030D7E60405473C98B39C69D51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net [Abstract] </link:label>
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<link:label id="lab_us-gaap_InventoryRawMaterialsNetOfReserves_B9621CC7789D999E2944C98B39C6537C_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryRawMaterialsNetOfReserves_B9621CC7789D999E2944C98B39C6537C" 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_B9621CC7789D999E2944C98B39C6537C_label_en-US" xlink:label="lab_us-gaap_InventoryRawMaterialsNetOfReserves_B9621CC7789D999E2944C98B39C6537C" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_B9621CC7789D999E2944C98B39C6537C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_C98AA829465FA9A07D83C98B39C6AB0C_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_C98AA829465FA9A07D83C98B39C6AB0C" 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_C98AA829465FA9A07D83C98B39C6AB0C_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoodsNetOfReserves_C98AA829465FA9A07D83C98B39C6AB0C" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_C98AA829465FA9A07D83C98B39C6AB0C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryNet_1947161500C7E47A1196C98B39C701FF_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_1947161500C7E47A1196C98B39C701FF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total inventory </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_1947161500C7E47A1196C98B39C701FF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_1947161500C7E47A1196C98B39C701FF" xlink:to="lab_us-gaap_InventoryNet_1947161500C7E47A1196C98B39C701FF" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_CECD1C2493DE12DB57AAC98B389341C2_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract_CECD1C2493DE12DB57AAC98B389341C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_CECD1C2493DE12DB57AAC98B389341C2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_D8475D5CB074774E7E3AC98B38937575_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_D8475D5CB074774E7E3AC98B38937575" 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_ShareholdersEquityAndShareBasedPaymentsTextBlock_D8475D5CB074774E7E3AC98B38937575_label_en-US" xlink:label="lab_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_D8475D5CB074774E7E3AC98B38937575" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shareholders' Equity and Share-based Payments [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_D8475D5CB074774E7E3AC98B38937575" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_C39416648710AC6B0E2591706940998B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_C39416648710AC6B0E2591706940998B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Operating Leased Assets [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_C39416648710AC6B0E2591706940998B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_C39416648710AC6B0E2591706940998B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Operating Leased Assets [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_C39416648710AC6B0E2591706940998B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseArrangementTypeAxis_5740E3395CBE9268497191706940367F_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_5740E3395CBE9268497191706940367F" 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_5740E3395CBE9268497191706940367F_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_5740E3395CBE9268497191706940367F" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseArrangementTypeAxis" xlink:label="loc_us-gaap_LeaseArrangementTypeAxis_5740E3395CBE9268497191706940367F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13" 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_FC040C33A6117EBF53B9917069403D13_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseArrangementTypeDomain" xlink:label="loc_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13" xlink:to="lab_us-gaap_LeaseArrangementTypeDomain_FC040C33A6117EBF53B9917069403D13" xlink:type="arc"/>
<link:label id="lab_us-gaap_CounterpartyNameAxis_AFABC6C8C2C0A711158F91706940E828_terseLabel_en-US" xlink:label="lab_us-gaap_CounterpartyNameAxis_AFABC6C8C2C0A711158F91706940E828" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Axis] </link:label>
<link:label id="lab_us-gaap_CounterpartyNameAxis_AFABC6C8C2C0A711158F91706940E828_label_en-US" xlink:label="lab_us-gaap_CounterpartyNameAxis_AFABC6C8C2C0A711158F91706940E828" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_AFABC6C8C2C0A711158F91706940E828" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_7E99C5BE9D4284C0D71691706941A1D3_terseLabel_en-US" xlink:label="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_7E99C5BE9D4284C0D71691706941A1D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Domain] </link:label>
<link:label id="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_7E99C5BE9D4284C0D71691706941A1D3_label_en-US" xlink:label="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_7E99C5BE9D4284C0D71691706941A1D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_7E99C5BE9D4284C0D71691706941A1D3" xlink:type="locator"/>
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<link:label id="lab_calx_PetalumaLeaseMember_9BF0AFF142D4DB466BA091877A710767_terseLabel_en-US" xlink:label="lab_calx_PetalumaLeaseMember_9BF0AFF142D4DB466BA091877A710767" 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_9BF0AFF142D4DB466BA091877A710767_label_en-US" xlink:label="lab_calx_PetalumaLeaseMember_9BF0AFF142D4DB466BA091877A710767" 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_9BF0AFF142D4DB466BA091877A710767_documentation_en-US" xlink:label="lab_calx_PetalumaLeaseMember_9BF0AFF142D4DB466BA091877A710767" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Petaluma Lease </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_PetalumaLeaseMember" xlink:label="loc_calx_PetalumaLeaseMember_9BF0AFF142D4DB466BA091877A710767" xlink:type="locator"/>
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<link:label id="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560_terseLabel_en-US" xlink:label="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Petaluma Lease Amendment </link:label>
<link:label id="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560_label_en-US" xlink:label="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Petaluma Lease Amendment [Member] </link:label>
<link:label id="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560_documentation_en-US" xlink:label="lab_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Petaluma Lease Amendment [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_PetalumaLeaseAmendmentMember" xlink:label="loc_calx_PetalumaLeaseAmendmentMember_7D4BD3730A10AA0DFCA59187F0C64560" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_107DEBA845D8E4D822D2917069423BE0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_107DEBA845D8E4D822D2917069423BE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Leased Assets [Line Items] </link:label>
<link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_107DEBA845D8E4D822D2917069423BE0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_107DEBA845D8E4D822D2917069423BE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leased Assets [Line Items] </link:label>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_9F44812C7AAE1E6A23BB91706942EE49_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_9F44812C7AAE1E6A23BB91706942EE49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Remainder of 2017 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_9F44812C7AAE1E6A23BB91706942EE49_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_9F44812C7AAE1E6A23BB91706942EE49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Remainder of Fiscal Year </link:label>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_4B0D8BC9B59A3DFA103391706942ABD0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_4B0D8BC9B59A3DFA103391706942ABD0" 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_OperatingLeasesFutureMinimumPaymentsDueCurrent_4B0D8BC9B59A3DFA103391706942ABD0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_4B0D8BC9B59A3DFA103391706942ABD0" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_4B0D8BC9B59A3DFA103391706942ABD0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C" 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_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_C8241AF17C0F82C83715917069423E1C" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC" 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_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_1BEED29DB74B2614967691706942DDBC" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_1401832545E533120C82917069433A16" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8701803F7933DB8B49F8917069437973_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8701803F7933DB8B49F8917069437973" 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_8701803F7933DB8B49F8917069437973_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8701803F7933DB8B49F8917069437973" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8701803F7933DB8B49F8917069437973" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Future minimum payments due </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8ED56BE20A3BB2BB10AB917069430CA9" xlink:type="arc"/>
<link:label id="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0_terseLabel_en-US" xlink:label="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from lease incentives </link:label>
<link:label id="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0_label_en-US" xlink:label="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds From Lease Incentives </link:label>
<link:label id="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0_documentation_en-US" xlink:label="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Proceeds From Lease Incentives </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_ProceedsFromLeaseIncentives" xlink:label="loc_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:to="lab_calx_ProceedsFromLeaseIncentives_AB7BDF5B060BE17B9D4C91854878EDD0" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707" 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_BBFAE475BEEB6196D6C89185DACBC707_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707" xlink:to="lab_us-gaap_LeaseAndRentalExpense_BBFAE475BEEB6196D6C89185DACBC707" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7" 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_06F3945293DF2BF630DBC98B38B2F3B7_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7" xlink:to="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_06F3945293DF2BF630DBC98B38B2F3B7" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8" 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_A6A6ACE5E796DB06B965C98B38B28CD8_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_A6A6ACE5E796DB06B965C98B38B28CD8" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214" 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_9372A8B58F04EE2CA6DFC98B38B2A214_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_9372A8B58F04EE2CA6DFC98B38B2A214" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2_verboseLabel_en-US" xlink:label="lab_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2" 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_81237ED6CA3280B56BB5C98B38B2CEF2_label_en-US" xlink:label="lab_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2" xlink:to="lab_us-gaap_EquipmentMember_81237ED6CA3280B56BB5C98B38B2CEF2" xlink:type="arc"/>
<link:label id="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44_verboseLabel_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Computer equipment and software </link:label>
<link:label id="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44_label_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44" 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_F8E5B22A599446AC5FADC98B38B2EB44_documentation_en-US" xlink:label="lab_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44" 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-20170930.xsd#calx_ComputerEquipmentAndPurchasedSoftwareMember" xlink:label="loc_calx_ComputerEquipmentAndPurchasedSoftwareMember_F8E5B22A599446AC5FADC98B38B2EB44" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1_verboseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1" 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_8FE09205AF0CEA07C01DC98B38B265B1_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1" xlink:to="lab_us-gaap_FurnitureAndFixturesMember_8FE09205AF0CEA07C01DC98B38B265B1" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseholdImprovementsMember_6A9FA624866AAE47B20AC98B38B2102D_verboseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_6A9FA624866AAE47B20AC98B38B2102D" 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_6A9FA624866AAE47B20AC98B38B2102D_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_6A9FA624866AAE47B20AC98B38B2102D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_6A9FA624866AAE47B20AC98B38B2102D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_CC22CB366D00892876C2C98B38B2A405_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_CC22CB366D00892876C2C98B38B2A405" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
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<link:label id="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E_terseLabel_en-US" xlink:label="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue Contract </link:label>
<link:label id="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E_label_en-US" xlink:label="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue Contract [Member] </link:label>
<link:label id="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E_documentation_en-US" xlink:label="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Revenue Contract [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_RevenueContractMember" xlink:label="loc_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:to="lab_calx_RevenueContractMember_3B2925381FF91C240A1DC98B39DE516E" xlink:type="arc"/>
<link:label id="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9_terseLabel_en-US" xlink:label="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Products and services </link:label>
<link:label id="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9_label_en-US" xlink:label="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product and Services [Member] </link:label>
<link:label id="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9_documentation_en-US" xlink:label="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Product and Services </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_ProductAndServicesMember" xlink:label="loc_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:to="lab_calx_ProductAndServicesMember_D08C74A84F1EF232656AC98B39DE28E9" xlink:type="arc"/>
<link:label id="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46_terseLabel_en-US" xlink:label="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Extended warranty </link:label>
<link:label id="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46_label_en-US" xlink:label="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Extended Warranty [Member] </link:label>
<link:label id="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46_documentation_en-US" xlink:label="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Extended Warranty </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_ExtendedWarrantyMember" xlink:label="loc_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:to="lab_calx_ExtendedWarrantyMember_B9226059AF543A7A44D0C98B39DE3F46" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred Revenue Arrangement [Line Items] </link:label>
<link:label id="lab_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue Arrangement [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueArrangementLineItems" xlink:label="loc_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444" xlink:to="lab_us-gaap_DeferredRevenueArrangementLineItems_F02F018366F6C1EA9D0EC98B39DE3444" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_0AFC47E22753E139AE7BC98B39E3D564_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_0AFC47E22753E139AE7BC98B39E3D564" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue, current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_0AFC47E22753E139AE7BC98B39E3D564" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueCurrent_0AFC47E22753E139AE7BC98B39E3D564" xlink:to="lab_us-gaap_DeferredRevenueCurrent_0AFC47E22753E139AE7BC98B39E3D564" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueNoncurrent_DFD4A3EFEFC7F46A1CF8C98B39E35C58_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_DFD4A3EFEFC7F46A1CF8C98B39E35C58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue, noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_DFD4A3EFEFC7F46A1CF8C98B39E35C58" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueNoncurrent_DFD4A3EFEFC7F46A1CF8C98B39E35C58" xlink:to="lab_us-gaap_DeferredRevenueNoncurrent_DFD4A3EFEFC7F46A1CF8C98B39E35C58" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082_totalLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>
<link:label id="lab_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082_label_en-US" xlink:label="lab_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenue" xlink:label="loc_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082" xlink:to="lab_us-gaap_DeferredRevenue_5895B78D29315C059615C98B39E30082" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of income taxes </link:label>
<link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF_label_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF" xlink:to="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_AFC1032F866D7BF1A17BC98B39BF3FFF" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue: </link:label>
<link:label id="lab_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenues [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092" xlink:to="lab_us-gaap_RevenuesAbstract_4CE090115E3B778888989CCD13E73092" xlink:type="arc"/>
<link:label id="lab_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0_terseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Products </link:label>
<link:label id="lab_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0_label_en-US" xlink:label="lab_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sales Revenue, Goods, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="loc_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0" xlink:to="lab_us-gaap_SalesRevenueGoodsNet_5FB5BFE97C46DBAF56599CCD13E704F0" xlink:type="arc"/>
<link:label id="lab_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075_terseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Services </link:label>
<link:label id="lab_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075_label_en-US" xlink:label="lab_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sales Revenue, Services, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075" xlink:to="lab_us-gaap_SalesRevenueServicesNet_90B0DF6A417E428A8F629CCD13E7A075" xlink:type="arc"/>
<link:label id="lab_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90_totalLabel_en-US" xlink:label="lab_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total revenue </link:label>
<link:label id="lab_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90_label_en-US" xlink:label="lab_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenues </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90" xlink:to="lab_us-gaap_Revenues_BB8808D7530460E03E5C9CCD13E7ED90" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3" 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_13CD5F7B6AFC6E28583A9CCD13E8F4F3_label_en-US" xlink:label="lab_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3" xlink:to="lab_us-gaap_CostOfRevenueAbstract_13CD5F7B6AFC6E28583A9CCD13E8F4F3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Products </link:label>
<link:label id="lab_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods Sold </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfGoodsSold" xlink:label="loc_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5" xlink:to="lab_us-gaap_CostOfGoodsSold_B20E24F1894ACC75C53E9CCD13E888B5" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Services </link:label>
<link:label id="lab_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF_label_en-US" xlink:label="lab_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Services </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfServices" xlink:label="loc_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF" xlink:to="lab_us-gaap_CostOfServices_5331CCD0FC44F648EA199CCD13E8DEDF" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3_totalLabel_en-US" xlink:label="lab_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3" 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_5D30D3F4F838EC6398409CCD13E8FFC3_label_en-US" xlink:label="lab_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3" xlink:to="lab_us-gaap_CostOfRevenue_5D30D3F4F838EC6398409CCD13E8FFC3" xlink:type="arc"/>
<link:label id="lab_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>
<link:label id="lab_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1_label_en-US" xlink:label="lab_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross Profit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1" xlink:to="lab_us-gaap_GrossProfit_0088DEA40F82E73407629CCD13E842C1" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8" 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_22CF386B3D1C56C6F08B9CCD13E877B8_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8" xlink:to="lab_us-gaap_OperatingExpensesAbstract_22CF386B3D1C56C6F08B9CCD13E877B8" xlink:type="arc"/>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68_verboseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68" 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_FC7BFCE2D18B69F49A519CCD13E82D68_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpense_FC7BFCE2D18B69F49A519CCD13E82D68" xlink:type="arc"/>
<link:label id="lab_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965_verboseLabel_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965" 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_B9C5A05BF40F572B66E09CCD13E8A965_label_en-US" xlink:label="lab_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965" xlink:to="lab_us-gaap_SellingAndMarketingExpense_B9C5A05BF40F572B66E09CCD13E8A965" xlink:type="arc"/>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D" 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_FB5B731B9898AAA8BF0E9CCD13E80F6D_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense_FB5B731B9898AAA8BF0E9CCD13E80F6D" xlink:type="arc"/>
<link:label id="lab_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047_verboseLabel_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" 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_CEACC51E756BE65EA0629CCD13E8F047_label_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" 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_CEACC51E756BE65EA0629CCD13E8F047_documentation_en-US" xlink:label="lab_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" 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-20170930.xsd#calx_OperatingExpensesAmortization" xlink:label="loc_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" xlink:to="lab_calx_OperatingExpensesAmortization_CEACC51E756BE65EA0629CCD13E8F047" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestructuringCharges_B43490E70495C58AEBA79CCD13E8008D_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCharges_B43490E70495C58AEBA79CCD13E8008D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_B43490E70495C58AEBA79CCD13E8008D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringCharges_B43490E70495C58AEBA79CCD13E8008D" xlink:to="lab_us-gaap_RestructuringCharges_B43490E70495C58AEBA79CCD13E8008D" xlink:type="arc"/>
<link:label id="lab_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Litigation settlement gain </link:label>
<link:label id="lab_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666_label_en-US" xlink:label="lab_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) Related to Litigation Settlement </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossRelatedToLitigationSettlement" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666" xlink:to="lab_us-gaap_GainLossRelatedToLitigationSettlement_556EEBDCD41EE401BD9D9CCD13E8E666" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825" 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_0307551666D644A588F49CCD13E86825_label_en-US" xlink:label="lab_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825" xlink:to="lab_us-gaap_OperatingExpenses_0307551666D644A588F49CCD13E86825" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Income (loss) from operations </link:label>
<link:label id="lab_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Income (Loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D" xlink:to="lab_us-gaap_OperatingIncomeLoss_BE2E704EDF90EB85EEF79CCD13E82F0D" xlink:type="arc"/>
<link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A46EF78D7FA1862870829CCD13E86CB8_verboseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A46EF78D7FA1862870829CCD13E86CB8" 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_A46EF78D7FA1862870829CCD13E86CB8_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_A46EF78D7FA1862870829CCD13E86CB8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_A46EF78D7FA1862870829CCD13E86CB8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_3C4A48F15CFF34B852EB9CCD13E8F702_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_3C4A48F15CFF34B852EB9CCD13E8F702" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Interest income (expense), net </link:label>
<link:label id="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_3C4A48F15CFF34B852EB9CCD13E8F702_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_3C4A48F15CFF34B852EB9CCD13E8F702" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Income (Expense), Nonoperating, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_3C4A48F15CFF34B852EB9CCD13E8F702" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_89866859C4A1917154609CCD13E9FC97_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_89866859C4A1917154609CCD13E9FC97" 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_89866859C4A1917154609CCD13E9FC97_label_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_89866859C4A1917154609CCD13E9FC97" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_89866859C4A1917154609CCD13E9FC97" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EE2420FF249319FF2F309CCD13E9263F_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EE2420FF249319FF2F309CCD13E9263F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Income (loss) before provision for income taxes </link:label>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EE2420FF249319FF2F309CCD13E9263F_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EE2420FF249319FF2F309CCD13E9263F" 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, Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EE2420FF249319FF2F309CCD13E9263F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_00E512A7DD223EAD7CDF9CCD13E98E69_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_00E512A7DD223EAD7CDF9CCD13E98E69" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Provision for income taxes </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_00E512A7DD223EAD7CDF9CCD13E98E69" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProfitLoss_2F0A518C7C3D7B583A629CCD13E9A2A4_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_2F0A518C7C3D7B583A629CCD13E9A2A4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net income (loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_2F0A518C7C3D7B583A629CCD13E9A2A4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EarningsPerShareAbstract_A0139D3D4457BEA763379CCD13E9A5CD_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_A0139D3D4457BEA763379CCD13E9A5CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net income (loss) per common share: </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_A0139D3D4457BEA763379CCD13E9A5CD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_9DCDC1D4AD45CFEB12569CCD13E99153_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_9DCDC1D4AD45CFEB12569CCD13E99153" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average number of shares used to compute net loss per common share: </link:label>
<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_9DCDC1D4AD45CFEB12569CCD13E99153_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_9DCDC1D4AD45CFEB12569CCD13E99153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Weighted Average Number of Shares Outstanding Reconciliation [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_9DCDC1D4AD45CFEB12569CCD13E99153" xlink:type="locator"/>
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<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C8D984DC204A854E32C19CCD13E97727_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C8D984DC204A854E32C19CCD13E97727" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basic (in shares) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C8D984DC204A854E32C19CCD13E97727" xlink:type="locator"/>
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<link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_5A8D004DDDE8C3AA9E709CCD13E98A3F_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_5A8D004DDDE8C3AA9E709CCD13E98A3F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Diluted (in shares) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_5A8D004DDDE8C3AA9E709CCD13E98A3F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_B4D8F30B9CB11EE91BDB9CCD13E98C9A_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_B4D8F30B9CB11EE91BDB9CCD13E98C9A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss), net of tax: </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_B4D8F30B9CB11EE91BDB9CCD13E98C9A_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_B4D8F30B9CB11EE91BDB9CCD13E98C9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_B4D8F30B9CB11EE91BDB9CCD13E98C9A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_D0682D80CA2AFAAD5DA39CCD13E96FE9_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_D0682D80CA2AFAAD5DA39CCD13E96FE9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Unrealized gains (losses) on available-for-sale marketable securities, net </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_D0682D80CA2AFAAD5DA39CCD13E96FE9_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_D0682D80CA2AFAAD5DA39CCD13E96FE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_D0682D80CA2AFAAD5DA39CCD13E96FE9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_92FF3BE395A4FD1DBE589CCD13E9CB66_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_92FF3BE395A4FD1DBE589CCD13E9CB66" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation adjustments, net </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_92FF3BE395A4FD1DBE589CCD13E9CB66_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_92FF3BE395A4FD1DBE589CCD13E9CB66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_92FF3BE395A4FD1DBE589CCD13E9CB66" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFE1EA54F2EC546EB06D9CCD13E96672_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFE1EA54F2EC546EB06D9CCD13E96672" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other comprehensive income, net of tax </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFE1EA54F2EC546EB06D9CCD13E96672_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFE1EA54F2EC546EB06D9CCD13E96672" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFE1EA54F2EC546EB06D9CCD13E96672" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_35B8155F277595FF76B79CCD13E934D9_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_35B8155F277595FF76B79CCD13E934D9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Comprehensive income (loss) </link:label>
<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_35B8155F277595FF76B79CCD13E934D9_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_35B8155F277595FF76B79CCD13E934D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_35B8155F277595FF76B79CCD13E934D9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_62EEAADCA03A39B0BEBB9CCD13E9725C_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_62EEAADCA03A39B0BEBB9CCD13E9725C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_62EEAADCA03A39B0BEBB9CCD13E9725C" xlink:type="locator"/>
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<link:label id="lab_calx_DocumentAndEntityInformationAbstract_CEAC2CBD578215A602A1C98B38CC6459_label_en-US" xlink:label="lab_calx_DocumentAndEntityInformationAbstract_CEAC2CBD578215A602A1C98B38CC6459" 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_CEAC2CBD578215A602A1C98B38CC6459_documentation_en-US" xlink:label="lab_calx_DocumentAndEntityInformationAbstract_CEAC2CBD578215A602A1C98B38CC6459" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Document and entity information. </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_DocumentAndEntityInformationAbstract_CEAC2CBD578215A602A1C98B38CC6459" xlink:to="lab_calx_DocumentAndEntityInformationAbstract_CEAC2CBD578215A602A1C98B38CC6459" xlink:type="arc"/>
<link:label id="lab_dei_EntityRegistrantName_924A5BE88C87ED0FFDBAC98B38CC4C75_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_924A5BE88C87ED0FFDBAC98B38CC4C75" 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_924A5BE88C87ED0FFDBAC98B38CC4C75_label_en-US" xlink:label="lab_dei_EntityRegistrantName_924A5BE88C87ED0FFDBAC98B38CC4C75" 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_924A5BE88C87ED0FFDBAC98B38CC4C75" xlink:type="locator"/>
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<link:label id="lab_dei_EntityCentralIndexKey_1EAF2696F0DBF0CC4988C98B38CC5A8F_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_1EAF2696F0DBF0CC4988C98B38CC5A8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
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<link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_1EAF2696F0DBF0CC4988C98B38CC5A8F" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentType_70CA45EE4077CEA8710DC98B38CC7AD5_terseLabel_en-US" xlink:label="lab_dei_DocumentType_70CA45EE4077CEA8710DC98B38CC7AD5" 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_70CA45EE4077CEA8710DC98B38CC7AD5_label_en-US" xlink:label="lab_dei_DocumentType_70CA45EE4077CEA8710DC98B38CC7AD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
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<link:label id="lab_dei_DocumentPeriodEndDate_8049D1EFDEFE044466E2C98B38CC3CCB_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_8049D1EFDEFE044466E2C98B38CC3CCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_E13523989FCB897438ED54342721DD23_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_E13523989FCB897438ED54342721DD23" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_E13523989FCB897438ED54342721DD23" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_E13523989FCB897438ED54342721DD23" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_E13523989FCB897438ED54342721DD23" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Period three </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Award, Tranche Three [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_984F3FB4C3356716DC2F5434272174B1" xlink:type="arc"/>
<link:label id="lab_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667" 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_9FF8F90E2F444E832C9C543427220667_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667" xlink:to="lab_us-gaap_AwardTypeAxis_9FF8F90E2F444E832C9C543427220667" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Award [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_DF329EA3269E5E3E435654342722BEAA" xlink:type="arc"/>
<link:label id="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59_terseLabel_en-US" xlink:label="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance Based Stock Options </link:label>
<link:label id="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59_label_en-US" xlink:label="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Based Stock Options [Member] </link:label>
<link:label id="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59_documentation_en-US" xlink:label="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Performance Based Stock Options </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_PerformanceBasedStockOptionsMember" xlink:label="loc_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:to="lab_calx_PerformanceBasedStockOptionsMember_17C54FCE31BBC98A31A854342722DE59" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6_verboseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) </link:label>
<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6" xlink:to="lab_us-gaap_RestrictedStockUnitsRSUMember_92589B457F9C8BFDB7FF5434272269B6" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Employee Stock Purchase Plan </link:label>
<link:label id="lab_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8_label_en-US" xlink:label="lab_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8" xlink:to="lab_us-gaap_EmployeeStockMember_79990347D5BC6883EABE5434272237D8" xlink:type="arc"/>
<link:label id="lab_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E_verboseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Performance Restricted Stock Units </link:label>
<link:label id="lab_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Shares [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E" xlink:to="lab_us-gaap_PerformanceSharesMember_2E802470FAD247E206E4543427239D9E" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F" 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>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48135657A670391087A954342724BE8F" xlink:type="arc"/>
<link:label id="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343_terseLabel_en-US" xlink:label="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of equity incentive plans </link:label>
<link:label id="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343_label_en-US" xlink:label="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Equity Incentive Plans </link:label>
<link:label id="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343_documentation_en-US" xlink:label="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number of equity plans. </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_NumberOfEquityIncentivePlans" xlink:label="loc_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:to="lab_calx_NumberOfEquityIncentivePlans_363F5BECC3953F319F7654342724C343" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Stock options granted (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27" 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, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_A5C22F4218D585309ED7543427245D27" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_508F75ED7CF9F851D550543427245163_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_508F75ED7CF9F851D550543427245163" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average grant date fair value (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_508F75ED7CF9F851D550543427245163_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_508F75ED7CF9F851D550543427245163" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_508F75ED7CF9F851D550543427245163" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_A1A437E5D31B6D3438BE5434272730ED_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_A1A437E5D31B6D3438BE5434272730ED" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Performance period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_A1A437E5D31B6D3438BE5434272730ED_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_A1A437E5D31B6D3438BE5434272730ED" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_A1A437E5D31B6D3438BE5434272730ED" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_0BF62AD85D13F109288A54342727DFA8_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_0BF62AD85D13F109288A54342727DFA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting percentage </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_0BF62AD85D13F109288A54342727DFA8_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_0BF62AD85D13F109288A54342727DFA8" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_0BF62AD85D13F109288A54342727DFA8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Lender [Domain] </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Lender [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C" xlink:to="lab_us-gaap_LineOfCreditFacilityLenderDomain_4CE62771D8C9214CE90E4A32E671180C" xlink:type="arc"/>
<link:label id="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308_terseLabel_en-US" xlink:label="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Silicon Valley Bank </link:label>
<link:label id="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308_label_en-US" xlink:label="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Silicon Valley Bank [Member] </link:label>
<link:label id="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308_documentation_en-US" xlink:label="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Silicon Valley Bank [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_SiliconValleyBankMember" xlink:label="loc_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:to="lab_calx_SiliconValleyBankMember_DE0FB43AA23B4D24B1C34A32E671D308" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779" 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_C547752E84596898B34E4A32E6716779_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779" xlink:to="lab_us-gaap_CreditFacilityAxis_C547752E84596898B34E4A32E6716779" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017" 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_FE0B899C323126A949244A32E671D017_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017" xlink:to="lab_us-gaap_CreditFacilityDomain_FE0B899C323126A949244A32E671D017" xlink:type="arc"/>
<link:label id="lab_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC" 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_7FB35CCC9697D38444044A32E671F9EC_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC" xlink:to="lab_us-gaap_LetterOfCreditMember_7FB35CCC9697D38444044A32E671F9EC" xlink:type="arc"/>
<link:label id="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1_terseLabel_en-US" xlink:label="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non Formula Revolver </link:label>
<link:label id="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1_label_en-US" xlink:label="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Non Formula Revolver [Member] </link:label>
<link:label id="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1_documentation_en-US" xlink:label="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Non Formula Revolver [Member] </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_NonFormulaRevolverMember" xlink:label="loc_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:to="lab_calx_NonFormulaRevolverMember_7E25466D04E51AC649684A32E671A1B1" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility </link:label>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_F715E60F82A69AD1FAF34A32E671CD25" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0" 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_9D1017AA62324DF8736E4A32E67130B0_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0" xlink:to="lab_us-gaap_VariableRateAxis_9D1017AA62324DF8736E4A32E67130B0" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D" 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_1234C8DEC6E6B0D6B39E4A32E671AA9D_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D" xlink:to="lab_us-gaap_VariableRateDomain_1234C8DEC6E6B0D6B39E4A32E671AA9D" xlink:type="arc"/>
<link:label id="lab_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1_terseLabel_en-US" xlink:label="lab_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prime Rate </link:label>
<link:label id="lab_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1_label_en-US" xlink:label="lab_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prime Rate [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrimeRateMember" xlink:label="loc_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1" xlink:to="lab_us-gaap_PrimeRateMember_DED6DFE9A6586D91C6A84A32E671BFE1" xlink:type="arc"/>
<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF" 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_03BCAE4449115900CF034A32E6713EDF_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF" xlink:to="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_03BCAE4449115900CF034A32E6713EDF" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A" xlink:to="lab_us-gaap_DebtInstrumentLineItems_F88F3FBD1010CD73801C4A32E6724A3A" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Maximum borrowing capacity </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6AC655F85ADD2A4446954A32E67219B9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum amount outstanding during period </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Amount Outstanding During Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C8F513E74A343E96AFE54A32E672B7CE" xlink:type="arc"/>
<link:label id="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076_terseLabel_en-US" xlink:label="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Early termination fees, amount </link:label>
<link:label id="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076_label_en-US" xlink:label="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Early Termination Fees, Amount </link:label>
<link:label id="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076_documentation_en-US" xlink:label="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Early Termination Fees, Amount </link:label>
<link:loc xlink:href="calx-20170930.xsd#calx_LineofCreditFacilityEarlyTerminationFeesAmount" xlink:label="loc_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:to="lab_calx_LineofCreditFacilityEarlyTerminationFeesAmount_22820BA9DE422E8758404A32E6725076" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D" 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_39CDC8B0597B1B515BA04A32E6724E9D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_39CDC8B0597B1B515BA04A32E6724E9D" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding revolving loans </link:label>
<link:label id="lab_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A" xlink:to="lab_us-gaap_LineOfCredit_47750900DE8F127C0A754A32E672B77A" xlink:type="arc"/>
</link:labelLink>
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4 Subsequent Filings that Reference this Filing

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

 2/23/24  Calix, Inc.                       10-K       12/31/23   88:8.1M
 2/21/23  Calix, Inc.                       10-K       12/31/22   88:8.9M
 2/22/22  Calix, Inc.                       10-K       12/31/21   89:9.1M                                   Workiva Inc Wde… FA01/FA
 2/22/21  Calix, Inc.                       10-K       12/31/20   96:9.9M
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