V-Cables
Use only v-cable PN 02L2074 with the multiaccess enclosure base Parallel
Channel Adapter.
Use the following rules for correct parallel channel attachment:
A maximum of six Parallel Channel Adapters (including any 3172 Model 3s)
can be attached to the same channel.
The V-cable does not have to be interconnected to other Parallel Channel
Adapters and can be located anywhere on the channel, provided that all other
4.5-MB devices are attached between the multiaccess enclosure base Parallel
Channel Adapters (or 3172 Model 3s) and the host.
Note: There is a possibility of interconnecting multiaccess enclosure base
Parallel Channel Adapters to 3172 models. The following rules would
apply in this case:
1. The multiaccess enclosure base Parallel Channel Adapters can
connect only to V-cables PN 33G3056 or PN 02L2074 (and no
other).
2. V-cable PN 25F9397 (used on early 3172 Model 1s)
cannot
be
used.
Channel Interface Cables
The Channel Interface Cables are two distinct cables. They are not
interchangeable. The following figure shows the cables. Use the colors on the
connectors on the cables to distinguish the differences between the cables.
Male
Channel Interface
Cable-in
Channel Interface
Cable-out
Female
Gray Black
BUS-in
BUS-out
TAG-in
TAG-out
Black Gray
Chapter 3. Multiaccess Enclosure Problem Determination 3-37
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