This document contains information related to the physical connectivity
for the Cisco CIP/CPA Parallel Channel connection with BUS and TAG mainframe
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
GRAY means the light gray connector on the end of a
AWAY means away from the host
This means the light gray end of a channel cable (and router cables) is
always the end farthest from the host CPU (3090, for example).
These are some ways to differentiate the Bus and Tag (B/T)
Y Cable - Bus and Tag IN is a Male 78-pin connector and should be
Black. Bus and Tag OUT is Female and should be Light Gray. The end with the
Select Out/Bypass (S/B) switch plugs into the CIP card. Where the two cables
emerge from the CIP card connector, Bus and Tag OUT is the cable that emerges
nearest the S/B switch.
IBM P/N 89F8392
Cisco P/N CAB-PCA-Y
FRU P/N 72-0864-01
VA Cable - Bus and Tag IN is a Female 78-pin connector and should be
Light Gray. P2 is Bus, P3 is Tag. If you hold the cable looking into the holes
in the 78-pin connector with the wide part of the 78-pin D-connector on top, P2
(Bus) is on the right and P3 (Tag) is on the left. The plastic on the ends of
the B/T connectors should be Black (very Dark Gray); they are Light Gray on the
VB cable. These Dark Gray connectors will connect to the Light Gray connectors
on the ends of the Bus and Tag cables that come from the host.
VB Cable - Bus and Tag OUT is a Male 78-pin connector and should be
Black. P2 is Bus, P3 is Tag. If you hold the cable looking into pins on the
78-pin connector with the wide part of the 78-pin D-connector on top, P2 (Bus)
is on the left and P3 (Tag) is on the right. The B/T connectors should be
tipped with Light Gray plastic (as opposed to Black on the VA cable). These
Light Gray ends should connect to the black (Dark Gray) ends of the Bus and Tag
cables that lead to the next downstream unit.
IBM P/N 12G7993
Cisco P/N CAB-PCA-VB
FRU P/N 72-0865-01
Terminator - Attaches to the Y cable in place of the VB cable and
terminates B/T OUT. It is a 78-pin Male connector and should be Black.