DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-78Packet Bus Fault Isolation and Repair
5
Packet Bus Fault Isolation and Repair
The following procedures provide a means of isolating and correcting faults on
both the packet bus and the various maintenance objects that use the packet
bus. The packet bus is shared by all circuit packs that communicate on it, and a
fault on one of those 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. (this is discussed in more detail later). For these
reasons, isolating the cause of packet bus failure can be complicated. This
discussion provides a flowchart and descriptions of the tools and procedures
used to isolate and correct packet bus faults.
This discussion is organized into the following sections which 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’’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.
■ ‘‘What is the Packet Bus?’’ 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’’ 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 failure symptoms of these
maintenance objects.
■ ‘‘Maintenance of the Packet Bus’’ describes the strategy of maintenance
software for packet bus. Similarities and differences between the packet
bus and the TDM Bus are discussed. An overview of the Fault Isolation
and Correction Procedures is also presented.
■ ‘‘The Maintenance/Test Circuit Pack (TN771)’’ discusses the use of the
Maintenance/Test circuit pack in both packet bus fault isolation and other
switch maintenance. The standalone mode of the Maintenance/Test circuit
pack, which is used to perform on-site packet bus fault isolation and
correction, is discussed in detail.
