Avaya MCC1 Maintenance Procedures page 242

Packet and serial bus maintenance
Isolating and repairing packet-bus faults
3 If the packet-bus fault is still present:
a Determine whether the backplane pins in the removed circuit pack's slot are bent using the
output from the Maintenance/Test circuit pack's stand-alone mode and the backplane
illustrations that appear earlier in this discussion.
b If the backplane pins are bent:
c If the backplane pins are not bent:
4 If the packet-bus fault is not present:
a Reinsert circuit packs one at a time and repeat the following substeps until every circuit
pack has been reinserted.
b Determine whether the packet-bus fault has returned.
c If the packet-bus fault has returned, the reinserted circuit pack is defective. Replace the
circuit pack and then continue.
d If the packet-bus fault does not return when every circuit pack has been reinserted, you are
finished.
Continue with Procedure 3: removing and reinserting a PN's control circuit packs
port circuit pack has been checked, but the packet-bus fault is still not resolved.
Procedure 3: removing and reinserting a PN's control circuit packs
reinserts a PN's control circuit packs one at a time. Depending upon the configuration these circuit packs
either use the packet bus for communication or are connected to it in the backplane wiring:
• TN2312AP IP Server Interface (IPSI)
• TN768, TN780, or TN2182 Tone-Clock
• PN's TN775 Maintenance
These are the only PN control circuit packs that are likely to cause a packet-bus problem in a stable
system. Perform this procedure on only these circuit packs.
If the TN771D stand-alone mode does not indicate packet-bus faults. Perform Procedure 3 for only the
IPSI or Tone-Clock circuit pack. Do not check for problems with backplane pins; determining whether
the problem is resolved by removing circuit packs is sufficient.
242
1 Power down the carrier.
2 Straighten or replace the pins.
3 Reinsert the circuit pack.
4 Restore power.
5 Repeat Step 2 for the same circuit pack.
1 Reinsert the circuit pack(s)
2 Repeat this procedure for the next set of circuit packs.
on page 242 if every
Procedure 3 removes and
Maintenance Procedures
December 2003