Avaya S8700 Maintenance Manual page 2317

For multi-connect configurations

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TDM-BUS (TDM Bus)

If the backplane pins are not bent, run the test tdm P command to

determine whether the TDM-bus fault is still present.

a. If any of the TDM-bus tests fail, the problem is with another circuit

b. If not, replace the suspected circuit pack. The procedure is finished.

4. If every standby circuit pack has been tested but the TDM-bus failure still

exists, execute the reset pnc interchange and the set tone-clock

commands to put the currently active circuit packs into standby mode.

Repeat Part 3 of this procedure for each of the newly active circuit packs.

Procedure 4: Isolating TDM-Bus Failures to Carriers

Procedure 4 attempts to isolate a TDM-bus failure to a particular set of carriers.

Only the circuit packs in selected carriers are checked. Procedure 4 is used if the

preceding procedures fail, because it can help locate failures of:

Multiple circuit packs

The carrier's hardware itself

In this procedure, the TDM/LAN cable assemblies and TDM/LAN bus terminators

are replaced.

If replacement does not resolve the TDM-bus fault, the cabinet is reconfigured so

that certain carriers are disconnected from the TDM bus. This is done by moving

the TDM/LAN bus terminators (ZAHF4) on the carrier's backplane. To terminate a

TDM bus at the end of a particular carrier, the TDM bus cable that connects the

carrier to the next carrier should be unplugged and replaced with a TDM/LAN bus

terminator (see

essential circuit packs to the system's operation and TDM-bus maintenance (for

example, MSSNET and Tone-Clock), must still be connected to the shortened

pack. Reinsert the originally suspected circuit pack, and repeat

Part 3 for the next circuit pack.

8-97). As the length of a TDM bus is modified, any

Issue 1 May 2002

Troubleshooting