Avaya MCC1 Maintenance Procedures page 267

If the Packet Bus problem is present when the circuit pack is inserted, but is resolved when the circuit
pack is removed, either the circuit pack or the backplane pins in that slot caused the problem. If the
backplane pins are intact, replace the circuit pack.
NOTE:
In a multiple failure situation, the circuit pack could be one cause of the Packet Bus
problem. However, there could also be other failures that are causing Packet Bus faults.
In Procedure 2, an option of working either with one circuit pack at a time or with multiple circuit packs
simultaneously is available. In view of this, determine the level of service interruption to be allowed
during this procedure. If causing a disruption to all users in the port network is deemed permissible, large
groups of circuit packs should be worked with. This option allows faster job completion. However, if
large service disruptions are to be avoided, work with one circuit pack at a time. This option is
slower, but it disrupts only the users of a single circuit pack.
CAUTION:
If the TN771 Standalone mode does NOT indicate Packet Bus faults, perform Procedure 2
for ONLY the port (purple) slot Packet circuit packs listed in
packs,
Determining if the problem is resolved by removing circuit packs is sufficient.
Steps for Procedure 2
1 Remove one or several circuit packs as appropriate, according to the considerations presented in
the previous paragraphs. Any circuit pack(s) (whether Packet or non-Packet) that have been
recently inserted should be checked first. It is likely that such a circuit pack caused a new
problem. Keep in mind that Packet circuit packs should be checked before non-Packet circuit
packs.
If the decision is made to remove multiple circuit packs, consider working with an entire carrier at
a time to ensure a good granularity.
2 Determine if the Packet Bus fault is still present.
3 If the Packet Bus fault is still present:
a Determine if the backplane pins in the removed circuit pack's slot are bent. Use the output
from the Maintenance/Test standalone mode and
backplane (front),
on page 258.
b If the backplane pins are bent, power down the carrier (see
on page 391), straighten or replace the pins, reinsert the circuit pack, restore power, and
repeat Procedure 2, beginning with Step 2, for the same circuit pack.
!
If this is a High or Critical Reliability system, and if the slot is in the Active control carrier, perform
an SPE interchange before changing the circuit pack.
c If the backplane pins are not bent, reinsert the circuit pack(s), and perform Procedure 2 for
the next set of circuit packs.
Maintenance Procedures
December 2003
on page 266. Also, problems with the backplane pins need not be checked for.
on page 257 and
WARNING:
Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
Table 65, Packet bus circuit
Figure 75, Packet bus leads on the
Figure 76, Packet bus leads on the backplane (back),
Removing and restoring power
267