DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1236PKT-BUS (Packet Bus)
9
This section on the PKT-BUS maintenance object is limited to a description of the
Error and Alarm Log entries and the test sequence for the packet bus. The
following list summarizes some of the important points to consider when working
with the packet bus.
■ The Maintenance/Test circuit pack (TN771D) is a critical tool for isolating
packet bus faults. This circuit pack is present in each port network of a
Critical Reliability system (duplicated SPE
and
PNC). In a Standard
Reliability system, the circuit pack may be included as a customer option.
If a TN771D is not present,
one must be taken to the customer site
to allow
for proper fault isolation. The
‘‘Packet Bus Fault Isolation and Repair’’
section in Chapter 5, ‘‘Alarms, Errors, and Troubleshooting’’
describes the
packet bus testing facilities of the TN771D and when one must be taken to
the customer site.
■ Certain catastrophic packet bus failures have an effect on maintenance
software activities relating to Packet circuit packs, ports, and endpoints:
— Packet circuit pack (BRI-BD, PGATE-BD, PDATA-BD, UDS1-BD)
in-line errors indicating possible Packet Bus failures are logged in
the error log, but are not acted upon.
— Port-level (BRI-PORT, ABRI-PORT, PGATE-PT, PDATA-PT) in-line
errors on Packet circuit packs which indicate possible Packet Bus
failures
are not logged or acted upon
.
— Circuit pack and port in-line errors that are not relevant to the
Packet Bus, or that indicate a circuit pack failure, are acted upon in
the normal fashion.
— Periodic and scheduled background maintenance are not affected.
— Foreground maintenance (for example, a
test board
command
executed at a terminal) is not affected.
The actions in the previous list serve to reduce the system load, which
could become excessive if many maintenance objects are affected by a
packet bus failure. However, such an excessive load should in no way
impede the isolation and the correction of the faults.
When the above actions are implemented, Error Type 3329 is logged
against PKT-BUS, and a Warning alarm is raised. Other Packet Bus errors
may raise more severe alarms, thereby overriding the Warning alarm.
■ Since all packet traffic requires communication with the Packet Interface,
circuit pack in the SPE , a packet bus failure in the Processor Port-Network
(PPN) causes packet traffic in the Expansion Port-Networks (EPNs) to fail.
Due to this requirement, a PPN packet bus failure must be investigated
first whenever packet bus failures occur in multiple port-networks.
