Avaya MCC1 Maintenance Procedures page 268

Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
4 If the Packet Bus fault is not present, do the following:
a Reinsert a circuit pack. If multiple circuit packs have been removed, reinsert the circuit
packs one at a time, and repeat the following substeps until all of the circuit packs have
been reinserted.
b Determine if 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 all of the circuit packs have been reinserted,
the procedure is completed.
Continue with Procedure 3 if all the port circuit packs have been checked, but the Packet Bus fault is still
not resolved.
Procedure 3
Procedure 3 removes and reinserts control carrier circuit packs one at a time. The Packet Control, Tone-
Clock, and Expansion Interface circuit packs are the only processor complex circuit packs that
communicate on the Packet Bus. In addition, the Memory 1 and EPN Maintenance Board circuit packs
are connected to the Packet Bus in the backplane (while the Memory 2 circuit pack is not). Therefore,
these are the only processor complex circuit packs that are likely to cause a Packet Bus problem in a
stable system. As a result, Procedure 3 should be performed only on the Packet Control, Memory 1, and
EPN Maintenance Board circuit packs in all systems, and on the Expansion Interface and Tone-Clock
circuit packs in High and Critical Reliability systems.
CAUTION:
If the TN771 Standalone mode does NOT indicate Packet Bus faults, perform Procedure 3
for ONLY the Packet Control, Expansion Interface, and Tone-Clock circuit packs. Also,
problems with the backplane pins need not be checked for. Determining if the problem is
resolved by removing circuit packs is sufficient.
Standard Reliability only
1 Power down the control carrier (see. (see
2 Remove the suspect circuit pack.
3 As in Procedure 2, determine if the backplane pins in the removed circuit pack's slot are bent.
4 If the backplane pins are bent, do the following:
a Straighten or replace the pins
b Insert the same circuit pack
5 If the backplane pins are not bent, replace the circuit pack (reinsert the circuit pack if a
replacement is not available).
6 Turn the power back on to reboot the system (see
7 Determine if the Packet Bus fault is still present.
8 If the Packet Bus fault is still present, do the following:
a If the circuit pack was reinserted in Step 5, replace the circuit pack, and repeat Procedure
3.
b If the circuit pack was replaced in Step 5, repeat Procedure 3 for the next processor
complex circuit pack.
268
In a system without High or Critical Reliability, do the following:
Removing and restoring power on page 391).
Removing and restoring power
Maintenance Procedures
on page 391).
December 2003