Replacing The Four-Channel Comm Pack - Northern Telecom BCS35 Replacement Manual

148 Four–channel communication circuit pack
The Four–channel circuit pack provides the following functions:
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Interface between this circuit pack and the P/A Comm circuit pack is via a
50–pin ribbon cable. Signals carried by the cable are
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Figure 16–1 shows the jumper locations and circuit pack layout. See Table
16–1 for the jumper settings.
Replacing the Four–channel comm pack
Use the following procedure to replace this pack.
297-1001-536 Standard 01.03 August 1996
up to four channels of EIA RS–232 compatible serial interface (DTE
interface)
two channels, jumper–selectable, between Automatic Dial–up Unit
interface (unused) to modem/telephone line and serial channels
physical interface serial channels and the P/A Comm circuit pack.
nine EIA RS–232 leads for each of the four channels
multiple logic ground lines.