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 consi sts of a single bus, and o ne such bus app ears in each
port-network. The packet b us in each port-network is p hysically indep endent
from those in other port-networks, so eac h port-network has a separate PKT-BUS
maintenance object. This b us supports the following types of connection s:
■Logical control links b etween 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 TN16 55 Pac ket I nter fac e cir cuit pac k p rovid es th e SPE int erfa ce to the
packet bus. Packet Bus testi ng depend s on the TN771D Maintenance/Test circuit
pack, the TN1655 Packet Interface c ircuit pack, TN570 Expansion Inter face
circuit pack, and the Packet port circ uit 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 hard ware is defective. The individ ual test
descriptions p rovide more information.
The interactions between the pac ket bus and the circ uit packs that use the b us
are complex. Circuit p ack failures can alarm the p acket bus, while Packet Bus
faults can alarm or interrupt servic e to one or more circuit p acks and their ports
and endpoints. The ‘‘Packet Bus Fault Isolation and Repair’’ section in Chapter 5,
‘‘Alarms, Errors, and Troubleshooting’’ describes Pac ket Bus maintenance and
interactions circuit p acks. That section should b e referenced for all
troubleshooting and rep airs. The flowchart is the normal starting point for
experienced tec hnicians. Technicians unfamiliar with the pac ket bus and its
implementation in R
X
r should study the introd uctory material (for example, ‘‘What
is the Packet Bus?’’) before using the flowchar t to diagnose and rep air packet
bus faults.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run1
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 21Packet Bus
PKT-BUS MINOR test pkt P l Packet Bus
PKT-BUS WARNING test pkt P l Packet Bus