Troubleshooting Procedures - Avaya MCC1 Maintenance Procedures

S8700 only
Considerations for duplicated systems
Some packet bus-related components are duplicated in systems with one of the duplication options:
• In standard or high-reliability systems (duplicated server, nonduplicated PNC):
— TN2312AP IPSI circuit packs are nonduplicated in a duplex configuration and duplicated
in a high-reliability configuration.
— A TN771D Maintenance/Test circuit pack is optional in a PN.
— Maintenance/Test packet-bus reconfiguration is not enabled.
• In critical-reliability systems (duplicated server and PNC):
— TN2312AP IPSI circuit packs are duplicated.
— TN771D Maintenance/Test circuit packs are required in every PN.
— Maintenance/Test packet-bus reconfiguration is enabled.
If a packet-bus problem is caused by a duplicated component, switching to the standby component may
alleviate the problem and isolate the faulty circuit pack. Start by executing the commands in the
following list when they apply.
• reset system interchange: If this command resolves the packet-bus problem, the problem is with
the IPSI's Packet Interface circuit that was just switched to standby. Refer to
Interface).
• reset pnc interchange: If this command resolves the packet-bus problem, the problem is with the
EIs or the link on the PNC (a or b) that just became the standby. Refer to
Interface Circuit
• set tone-clock: If this command resolves the packet-bus problem, the problem is with the Tone-
Clock that just became the standby. Refer to
Continue with the

Troubleshooting procedures

Packet-bus faults are usually caused by a defective circuit pack connected to the backplane, by bent pins
on the backplane, or by defective cables or terminators that make up the packet bus. The first two faults
cause shorts, while the third fault causes either shorts or opens.
There are four procedures for correcting packet-bus faults. The one you use depends on the nature of the
fault. For example:
• If the Maintenance/Test packet-bus port is activated, and if there is an indication of open leads on
the packet bus from status port-network or Test #572, go directly to
failures
these do not cause open faults.
• If there are both shorts and opens, start with
return to Procedure 1 if shorts persist after the open leads are fixed.
Maintenance Procedures
December 2003
Pack).
Troubleshooting procedures
on page 244. Procedures 1 through 3 try to locate faulty circuit packs or bent pins and
Packet and serial bus maintenance
Isolating and repairing packet-bus faults
TDM-CLK (TDM Bus
on page 239.
Procedure 4: isolating failures
PKT-INT (Packet
EXP-INTF (Expansion
Clock).
Procedure 4: isolating
on page 244, and
239