Servers
IBM, Compaq, HP 

Desktops and Laptops
IBM, HP, Compag, Dell 

Printers
Lexmark, HP, Canon

Switches
Cabletron, Enterasys

Controllers
Memorex Telex

Routers
Cisco

CAU/LAM/MAU
IBM, 3 Com

CSU/DSU
Kentrox (routers)
Racal Datacom (Controllers)

Line Sharing Devices
Black Box

Modems
U. S. Robotics