Packet And Serial Bus Maintenance; Isolating And Repairing Packet-Bus Faults - Avaya MCC1 Maintenance Procedures

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
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
performing remote maintenance and on-site maintenance for the packet bus.
• Tools for packet bus fault isolation and correction
to isolate and correct packet-bus faults.
• What is the packet bus?
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
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.
• Packet bus maintenance
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)
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.
Maintenance Procedures
December 2003
on page 219
on page 245
on page 271
S8100 packet bus fault isolation and repair
on page 220 discusses the strategy and the requirements for
on page 220 discusses the tools that are needed
on page 220 describes the packet bus, its use in G3r, and the types of
on page 222 describes the various circuit packs, ports, and
on page 224 describes the strategy of maintenance software for packet
on page 226 discusses the use of the Maintenance/Test
Packet and serial bus maintenance
Isolating and repairing packet-bus faults
on
219