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Communication Manager Maintenance-Object Repair Procedures
2244 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
4. If every standby circuit pack has been tested but the TDM-bus failure still exists, execute
reset pnc interchange and set tone-clock 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 Figure 138
). As the length of a
TDM bus is modified, any 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
TDM bus.
Figure 138: Carrier Rewiring Example — Rear View of 5-Carrier Cabinet
A and B
Include
Extended to
Shortened Bus
(Control Carrier)
to Carrier A Only
Bus Shortened
. . . . . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . . . .
TDM/LAN Bus Cable TDM/LAN Bus Terminator
(All 5 Carriers
Cabinet
Configured
Normally
Carrier E
Carrier D
Fans
Carrier A
Carrier B
Carrier C
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .