Isolating and Repairing Packet-Bus Faults
Issue 1 May 2002
4-81
555-233-143
Isolating and Repairing Packet-Bus
Faults
The following procedures provide a means of isolating and correcting faults on
both the packet bus and the various maintenance objects (MOs) that use the
packet bus. The packet bus is shared by every circuit pack that communicates on
it, and a fault on one of those circuit packs can disrupt communications over the
packet bus. Furthermore, a circuit pack that does not use the packet bus can also
cause service disruptions by impinging on the backplane or otherwise modifying
the configuration of the bus. For these reasons, isolating the cause of a
packet-bus problem can be complicated. This discussion provides a flowchart
and describes the tools and procedures used to isolate and correct packet-bus
faults.
The following sections provide background information and troubleshooting
procedures. The Packet-Bus Fault Isolation flowchart is intended to be the normal
starting point for isolating and resolving packet-bus problems. Before using it, you
should familiarize yourself with packet-bus maintenance by reading the
introductory sections.
■
‘‘Remote Maintenance versus On-Site Maintenance’’ on page 4-82
:
Discusses the strategy and the requirements for performing remote
maintenance and on-site maintenance for the packet bus.
■
‘‘Tools for Packet-Bus Fault Isolation, Correction’’ on page 4-83
:
Discusses the tools that are needed to isolate and correct packet-bus
faults.
■
‘‘What is the Packet Bus?’’ on page 4-83
: Describes the packet bus, its
use in G3r, and the types of faults that can occur on the packet bus. A
diagram shows the physical and logical connections between circuit packs
connected to the packet bus.
■
‘‘Circuit Packs that Use the Packet Bus’’ on page 4-85
: Describes the
various circuit packs, ports, and endpoints that use the packet bus. This
section discusses how these MOs interact, how a fault in one MO can
affect another, and failure symptoms of these MOs.
■
‘‘Maintenance of the Packet Bus’’ on page 4-87
: Describes the strategy of
maintenance software for packet bus. This section discusses similarities
and differences between the packet bus and the TDM bus. An overview of
the Fault Isolation and Correction Procedures is also presented.
■
‘‘Maintenance/Test Circuit Pack (TN771D)’’ on page 4-90
: Discusses the
use of the Maintenance/Test circuit pack in both packet-bus fault isolation
and other switch maintenance. The stand-alone mode of the
Maintenance/Test circuit pack, which is used to perform on-site packet-bus
fault isolation and correction, is discussed in detail.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...