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Communication Manager Maintenance-Object Repair Procedures
1790 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
PKT-BUS (Packet Bus)
S8700 | 8710 / S8500
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 media server and every PN
● 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 TN2312AP IPSI circuit pack’s Packet Interface circuit provides the media server an
interface to the packet bus. Packet-bus testing depends on the TN771D Maintenance/Test
circuit pack, the TN2312AP IPSI circuit pack’s Packet Interface circuit, TN570 Expansion
Interface circuit pack, 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 Maintenance Procedures (03-300192) 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.
MO Name in Alarm
Log
Alarm
Level
Initial Command to Run
1
1. P is the port-network number indicated in the PORT field from the Alarm or Error Log.
Full Name of MO
PKT-BUS MAJ test pkt P l r 2
1
Packet Bus
PKT-BUS MIN test pkt P l Packet Bus
PKT-BUS WRN test pkt P l Packet Bus