3Com
A&R Telecom
AC Data Systems
ADC Telecommunications
Adtran
Advanced Fibre Communications
AG Communication Systems
Alcatel Network Systems
Allen Telecom
Allgon Enterpirses
AML Communications
AMP
Amphere
Andrew Corporation
Argus Technologies
Ascend Communications
Ascom Warren
AT&T
Avantek
Bailiwick

Components 

Attenuators
Filters
Base Station
Fiber Optic Cab
Cable
Microwave Radios
Control Frame
Optical Cross Connects
Digital Cross Connect
Repeaters
DWDM Equipment
Routers
Encoder

Cisco Systems
Compaq
Decibel
Digital Microwave Corp.
Digital Switch Corporation
Eastern Research
Ericsson
Fujitsu
Harris-Farinon
Hewlett Packard
Juniper
Lucent Technologies
Marconi/Lorains
Micom
Motorola
Motorola/Codex/UDS
NEC
NERA
Newbridge Networks
Nortel Networks

Components 

Echo Cancellers
Breakers & Fuses
Fuse & Alarm Panels
Circuit Packs
Multiplexers (T1/E1)
Cellular Antennas
Microcells, Metrocells, Modcells
Duplexers
Power Amplifier
DSX Panels
Rectifiers
Ethernet Bridges
Test & Measurement

Novell
RAD
Redback Networks
Siemens
Sun Microsystems
Tektronix
Telco Systems
Telect
Tellabs
Thomas & Betts
Trimm
TyLink
US Robotics
Verilink/Txport
Vina Technologies
Wescom Communications
Westell, Inc
Western Multiplex/Glenayre
Wilmore Electronics
Nortel Networks

Components 

Antennas and Dishes
Fuse & Alarm Panels
Channel Banks
Multicoupler
Cell on Wheels
MTSO Equipment
CE Frame
Power Supplies
Digital Loop Carrier Systems
Radio Frame
DC-DC Converters
Switches