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COMSPHERE 3000 Series Carrier
3-36 December 1994 3000-A2-GA31-80
COM Port Connection – External PC
Communication between the Model 3151 CSUs and
Model 3161 DSU/CSUs in a 3000 Series Carrier and an
external PC (attached either locally or through an external
modem) occurs through a shared communication (COM)
port. Since the Models 3151 and 3161 do not have their
own COM port for external access, one unit in the carrier
must be selected as the master communication port. This
unit then provides the COM port for all Models 3151 and
3161 in the carrier.
Only one Model 3151 or 3161 unit in the carrier can be
configured as the master communication unit. By using
COM port configuration options for this unit, you can
configure Port 2 on the Auxiliary Backplane as the COM
port for the carrier. An attached PC can then access any
unit in that carrier through the shared COM port on the
master communication unit.
Figure 3-25 shows the COM port adapter you use on
the Auxiliary Backplane to accomplish the COM port
connection for the master communication unit.
Figure 3-25. COM Port Adapter
Figure 3-26 shows a PC attached to the Auxiliary
Backplane using the COM port adapter and cable.
Figure 3-26. PC Attached to Auxiliary Backplane Using COM Port Adapter and Cable