Avaya S8700 Maintenance Manual page 156

Alarms, Errors, and Troubleshooting
''Packet Bus Fault Isolation Flowchart'' on page
for the troubleshooting process. It is used to determine whether a failure of
service is caused by the packet bus itself or by another MO on the packet
bus.
''Correcting Packet-Bus Faults'' on page
required to correct either a problem with the packet bus itself or one that is
caused by a circuit pack connected to the packet bus.
Remote Maintenance versus On-Site
Maintenance
Most packet-bus fault isolation and repair procedures require a technician to be
on-site. This is because packet-bus problems are caused by a hardware failure of
either the packet bus itself or a circuit pack that is connected to it. Initial
diagnoses can be made using the Packet-Bus Fault Isolation flowchart, but the:
Maintenance/Test Stand-Alone Mode procedure
Packet-Bus Fault Correction procedure
will require an on-site technician. These procedures are presented with this
requirement in mind.
The flowchart refers to the repair procedures in
Repair Procedures''
remotely located technician can refer to the appropriate section and attempt to
resolve any fault conditions. Some procedures require on-site repair action.
Keep in mind that failure of an MO appearing early in the flowchart can cause
alarms with MOs that appear later in the flowchart. Multiple dispatches can be
prevented by remotely checking subsequent stages on the flowchart and
preparing the on-site technician for replacement of several components, if
necessary.
The Maintenance/Test packet-bus port, described below, provides status
information that is accessed with the status port-network P command and the
PKT-BUS test sequence. The Maintenance/Test circuit pack may or may not be
present at a customer site, depending on the configuration of the switch. If a
Maintenance/Test circuit pack is absent, one must be taken to the site for
diagnosing packet-bus problems.
4-82 Issue 1 May 2002
for various MOs. When a decision point is reached, a
4-99: Is the starting point
4-103: Presents the procedures
Chapter 8, ''Maintenance-Object
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