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Tools for Packet Bus Fault Isolation and Correction
Issue 4 May 2002 9-3 555-233-123
The Maintenance/Test Packet Bus port (described in detail later in this chapter)
can give the remote technician information about the state of the packet bus. This
information can be obtained via the status system command and via the
PKT-BUS test sequence. As described later, the Maintenance/Test circuit pack
may or may not be present at a customer site, depending on system
configuration. If a Maintenance/Test circuit pack is not present, one must be taken
to the customer site.
In a high or critical reliability system, a Processor Interchange may resolve the
packet bus problem. This operation can be done remotely, and is discussed in the
‘‘Packet Bus Fault Correction’’ section in this chapter.
Tools for Packet Bus Fault Isolation
and Correction
The following list discusses several tools that are (or may be) required to perform
Packet Bus Fault Isolation and Correction. The technician should be provided with
these tools at the customer site:
■
TN771 Maintenance/Test circuit pack for use in standalone mode, as well
as the required connectors and cables. (Refer to the
‘‘The
Maintenance/Test Circuit Pack (TN771D)’’ section in this chapter.)
■
Replacement TN771 Maintenance/Test circuit pack may be needed.
Conditions for requirement, and the relevant implementation steps are
documented in the
‘‘Special Precaution Concerning the TN771’’ section in
this chapter.
■
Backplane pin-replacement kit may be required in the procedures
described in the
‘‘Packet Bus Fault Correction’’ section of this chapter. If
the kit is not available, replacement of a carrier may be required.