Issue 4 May 2002 9-1555-233-123
9
Packet Bus Fault Isolation and
Correction
General
This chapter describes the fault isolation/correction procedures for the Packet Bus
and for the various MOs that use the Packet Bus. Because the Packet Bus is
shared by all circuit packs that must communicate on it, a faulty circuit pack can
disrupt communication over the Packet Bus. In addition, a circuit pack that does
not use the Packet Bus can cause service disruptions if the physical configuration
of the switch is being modified (this is discussed in more detail later). For these
reasons, isolating the cause of Packet Bus failure can be complicated. In this
chapter, a flowchart is provided to aid in this isolation effort, as are detailed
discussions of the tools and procedures used in the fault isolation and correction.
This chapter is organized into several sections that provide introductory
information, as well as packet bus fault isolation and correction procedures. The
sections of the chapter are as follows:
■ ‘‘Remote Maintenance versus On-Site Maintenance’’ discusses the
strategy and the requirements for performing remote maintenance and
on-site maintenance for the Packet Bus.
■ ‘‘Tools for Packet Bus Fault Isolation and Correction’’ discusses the tools
that are needed to isolate and correct Packet Bus faults.
■ ‘‘Packet Bus’’ describes the Packet Bus, its use, and the types of faults that
can occur on the Packet Bus. A diagram that shows the physical and
logical connections between circuit packs connected to the Packet Bus is
also included.
■ ‘‘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.
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