AT&T Inc.
Barry County Telephone Co.
BT Group
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Emirates Telecommunication Corporation (Etisalat)
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KPN
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Tata Communications Limited
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Verizon Communications Inc.
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3M Communication Markets Division
ADTRAN, Inc.
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AFL Telecommunications LLC.
All Systems Broadband
ALOM Technologies Corporation
Alpha Technologies Ltd
ARRIS International plc
Avion Networks, Inc.
CABLCON
Calix, Inc.
Canoga Perkins
Cherokee Nation Industries, LLC dba Cherokee Nation Telecommunications
Ciena Corporation
Cisco Systems
Cognizant Technology Solutions India Pvt. Ltd.
CommScope
Communications Test Design (CTDI)
Comtech Telecommunications Corp
Comtest Networks, Inc.
Corning, Inc.
ECI Telecom
Ericsson
FiberHome Telecommunication Technologies Co., Ltd.
Fortress Solutions
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General Cable Corporation
Genesis Networks, Inc.
GF MICRO OPTICS PHILIPPINES, INC.
Goodman Networks
Hewlett Packard Enterprise
Huawei Technologies Co., Ltd.
ICBS
INCREDITEK
Infinera Corporation
iQor Global Services, LLC
Jabil Circuit Inc
Jiangsu Zhongtian Technology Co., Ltd.
Juniper Networks, Inc.
KCI Telecommunications, LLC
KGPCo
Link America, LLC
MDSi
Microsemi Frequency and Time Corporation
Millennium Technical Services, Inc.
Nave Communications Co.
NEC Groups
NOKIA
Oracle
PALCO Telecom Service, Inc.
PC Network Inc.
Power & Telephone Supply Company
Prysmian Cables and Systems USA, LLC
Purcell Systems, Inc
Ribbon Communications
Samsung Electronics
Sector Supply, LC
SPC
Sterlite Technologies Limited
Summit Container Corporation
Superior Essex International LP
Suttle
TE Connectivity
Tech Mahindra Limited
Telamon Technologies Corporation
Telect, Inc.
Teltech Group
Tempest Telecom Solutions LLC
The DESARA Group, Inc.
Tii Technologies Inc.
Trillion Communications Corporation
Trilogy Communications, Inc.
Vertiv
Viavi Solutions
Wipro Limited
World Wide Technology
ZTE Corporation
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Technofer.Ltd.Japan
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TUV SUD America, Inc.
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