DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-79Packet Bus Fault Isolation and Repair
5
■ ‘‘Packet Bus Fault Isolation Flowchart’’ is the starting point for the
troubleshooting process. It is used to determine if a failure of service is
caused by the packet bus itself or by another maintenance object on the
packet bus.
■ ‘‘Correcting Packet Bus Faults’’ presents the procedures 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 a packet bus failures 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 via use of the Packet Bus Fault Isolation Flowchart, but
the Maintenance/Test Standalone Mode Procedure and the Packet Bus Fault
Correction Procedure require that a technician be on-site. These procedures are
presented with this requirement in mind.
The flowchart refers to the repair procedures in
Chapter 9, ‘‘Maintenance Object
Repair Procedures’’ for various maintenance objects. When a decision point is
reached, a 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 a maintenance object appearing early in the
flowchart can cause alarms with maintenance objects 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 not present, one must be taken to the site for
diagnosing packet bus problems.
In a system with duplicated SPEs, an SPE interchange may resolve the packet
bus problem. This operation can be executed remotely, and is discussed in
Packet Bus Fault Correction Procedures
below.
