Avaya Definity SI, Maintenance Manual, Page: 761 / 2968

Maintenance of the Packet Bus
Issue 4 May 2002 9-9 555-233-123
Packet Bus Maintenance Software
Packet Bus maintenance software involves the traditional set of error conditions,
tests, and alarms relevant to Packet Bus faults. These are described in the
PKT-BUS section in
Chapter 10, ‘‘Maintenance Object Repair Procedures’’ , and
they are similar in design to the maintenance strategy for most maintenance
objects.
In addition, because a Packet Bus failure can cause all BRI/ASAI endpoints in the
affected Port Network (and their associated ports and circuit packs) to report
failures, special care must be taken to ensure that the flood of error messages
from the affected maintenance objects does not overload the system and interfere
with TDM Bus traffic. When such a failure occurs, maintenance of Packet circuit
packs is affected in the following manner:
■
ISDN-BRI circuit pack (BRI-BD) in-line errors indicating possible Packet
Bus failures are placed into the error log, but are not acted upon.
■
ISDN-BRI port (BRI-PORT, ABRI-PORT) in-line errors indicating possible
Packet Bus failures are neither placed into the error log nor acted
upon.
■
ISDN-BRI endpoint (BRI-SET, BRI-DAT, ASAI-ADJ) in-line error are
neither placed into the error log nor acted upon.
■
Circuit pack and port in-line errors that are not related to the Packet Bus, or
that indicate a circuit pack failure, are acted upon in the normal fashion.
■
Normal background maintenance (periodic and scheduled) is not affected.
■
Foreground maintenance (for example, commands executed on the
Manager I terminal) are not affected.
These interactions allow normal, non-Packet, system traffic to continue
unaffected, and they reduce the number of extraneous entries into the Error/Alarm
Logs. If the Packet Bus failure is caused by a failed circuit pack, the circuit pack
should appear in the Error/Alarm Logs, which aids in fault isolation.
The following events indicate a Packet Bus failure that requires the actions in the
previous paragraph to occur:
■
In-line errors that indicate a possible Packet Bus failure reported by two or
more Packet circuit packs
■
Packet Bus Uncorrectable report from the Maintenance/Test Packet Bus
port (M/T-PKT)
■
Packet Bus Interface Failure from the Packet Control (PKT-CTRL)
If such a failure occurs, this information will be available in an Error Log entry for
PKT-BUS. Refer to the PKT-BUS section in
Chapter 10, ‘‘Maintenance Object
Repair Procedures’’ , for more detailed information.