Packet and serial bus maintenance
Isolating and repairing packet-bus faults
Maintenance Procedures
219
December 2003
7
Packet and serial bus maintenance
The topics covered in this chapter include:
•
Isolating and repairing packet-bus faults
•
S8100 packet bus fault isolation and repair
•
G650 Serial Bus fault detection and isolation
Isolating and repairing packet-bus faults
NOTE:
This material does not apply to
S8100
; see
S8100 packet bus fault isolation and repair
page 245 for fault isolation and repair procedures for
S8100
.
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 versus on-site maintenance
on page 220 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
on page 220 discusses the tools that are needed
to isolate and correct packet-bus faults.
•
on page 220 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 222 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.
•
on page 224 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 226 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 CMC1
Page 1: ...Maintenance Procedures 555 245 103 Issue 1 1 December 2003 ...
Page 14: ...Contents 14 Maintenance Procedures December 2003 ...
Page 416: ...Additional maintenance procedures IP Telephones 416 Maintenance Procedures December 2003 ...
Page 426: ...Index X 426 Maintenance Procedures December 2003 ...
