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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Packet Bus Fault Isolation and Correction
Page 9-2Remote Maintenance versus On-Site Maintenance
9
■ ‘‘Circuit Packs That Use the Packet Bus’’ describes the various circuit
packs, ports, and endpoints that use the Packet Bus. The section
discusses how these maintenance objects interact, how a failure of one
maintenance object can affect another, and also the failure symptoms of
these maintenance objects.
■ ‘‘Maintenance of the Packet Bus’’ describes the Packet Bus maintenance
software strategy. Similarities and differences between the Packet Bus
and the TDM Bus are discussed. An overview of the Fault Isolation and
Correction Procedures is also presented.
■ ‘‘The Maintenance/Test Circuit Pack (TN771D)’’ discusses the use of the
Maintenance/Test circuit pack in normal switch maintenance, as well as its
role in Packet Bus fault isolation. The standalone mode of the
Maintenance/Test (which is used to perform the Packet Bus Fault Isolation
and Correction procedures on-site) is discussed in detail.
■ ‘‘Packet Bus Fault Isolation Flowchart’’presents a flowchart that is used to
isolate a Packet Bus problem. This flowchart is the starting point for this
process, and 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.
■ ‘‘Packet Bus Fault Correction’’ 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.
The Packet Bus Fault Isolation Flowchart is intended to be the normal starting
point for isolating and resolving Packet Bus problems. However, anyone who is
unfamiliar with Packet Bus maintenance should read the introductory sections to
gain a good understanding of the Packet Bus maintenance and the procedures
involved.
Remote Maintenance versus On-Site
Maintenance
Most packet bus fault isolation and repair procedures require a technician to be
on-site. This is true because a packet bus failure is caused by a hardware failure
of the packet bus itself or by a circuit pack that is connected to it. However, initial
diagnoses can be made via use of the flowchart presented in the ‘‘
Packet Bus
Fault Isolation Flowchart’’ section of this chapter. However, before implementing
the Maintenance/Test Standalone Mode Procedure (described later) and the
Packet Bus Fault Correction Procedure, a technician must be on-site.
The flowchart as presented refers to the repair procedures in Chapter 10,
‘‘Maintenance Object Repair Procedures’’, for various MOs. When one of the
decision points is reached, a remote technician can refer to the appropriate
section and attempt to resolve any fault conditions. In addition, the remote
technician can examine some of the other MOs on the flowchart. Keep in mind
that if an MO that appears early on the flowchart fails, this failure can cause
alarms with MOs that appear later in the flowchart.