DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1235PKT-BUS (Packet Bus)
9
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
maintenance object. This bus supports the following types of connections:
■ Logical control links between the SPE and all Expansion Port-Networks
(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 TN1655 Packet Interface circuit pack provides the SPE interface to the
packet bus. Packet Bus testing depends on the TN771D Maintenance/Test circuit
pack, the TN1655 Packet Interface circuit pack, TN570 Expansion Interface
circuit pack, and the Packet port circuit packs (TN556 ISDN-BRI Line, TN553
Packet Data Line, TN464 Universal DS1, and TN577 Packet Gateway). Packet
Bus tests may abort if some of these are not present in 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 ‘‘Packet Bus Fault Isolation and Repair’’
section in Chapter 5,
‘‘Alarms, Errors, and Troubleshooting’’ describes Packet Bus maintenance and
interactions 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 R
X
r should study the introductory material (for example, ‘‘What
is the Packet Bus?’’) before using the flowchart to diagnose and repair packet
bus faults.
MO 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
