Avaya S8700 - Pkt-Bus (Packet Bus)

Maintenance Object Repair Procedure
555-233-142
8-918 Issue 1 May 2002
PKT-BUS (Packet Bus)
The packet bus consists of a single bus, and one such bus appears in each port
network. The packet bus in each port network is physically independent from
those in other port networks, so each port network has a separate PKT-BUS MO.
This bus supports the following types of connections:
■ Logical control links between the server and every EPN
■ ISDN-BRI D-channel transport (signaling)
■ ASAI D-channel transport (signaling)
■ ISDN-PRI D-channel (signaling)
■ X.25 system adjunct signaling and traffic
■ System Access Ports
The TN2312 IPSI circuit pack’s Packet Interface circuit provides the server an
interface to the packet bus. Packet-bus testing depends on the TN771D
Maintenance/Test circuit pack, the TN2312 IPSI circuit pack’s Packet Interface
circuit, and various port circuit packs (including TN556 ISDN-BRI Line, TN553
Packet Data Line, and TN464 Universal DS1). Packet Bus tests may abort if
some of these are absent from the system. The tests may yield inconsistent
results if any of this hardware is defective. The individual test descriptions provide
more information.
The interactions between the packet bus and the circuit packs that use the bus
are complex. Circuit pack failures can alarm the packet bus, while packet-bus
faults can alarm or interrupt service to one or more circuit packs and their ports
and endpoints. The ‘‘Isolating and Repairing Packet-Bus Faults’’ section in
Chapter 4, ‘‘Alarms, Errors, and Troubleshooting’’ describes packet-bus
maintenance and interactions with circuit packs. That section should be
referenced for all troubleshooting and repairs. The flowchart is the normal starting
point for experienced technicians. Technicians unfamiliar with the packet bus and
its implementation in RXr should study the introductory material (for example,
‘‘What is the Packet Bus?’’) before using the flowchart to diagnose and repair
packet bus faults.
MO’s Name (in
Alarm Log) Alarm Level
Initial Command to
Run
1
1. where P is the port-network number indicated in the PORT field from the Alarm or Error Log.
Full Name of MO
PKT-BUS MAJOR test pkt P l r 2
1
Packet Bus
PKT-BUS MINOR test pkt P l Packet Bus
PKT-BUS WARNING test pkt P l Packet Bus