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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1081PKT-BUS (Packet Bus)
10
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.
Therefore, there is one instance of the Packet Bus maintenance object for each
port network.
In DEFINITY, the Packet Bus is used to carry ISDN-BRI and ASAI signaling
information. The SPE interface to the Packet Bus is in the TN778 Packet Control
circuit pack (PKT-CTRL). Packet Bus maintenance is performed only when the
Packet Bus is enabled on the Maintenance-Related System Parameters form.
Packet Bus testing is dependent on the Packet Bus port of the TN771
Maintenance/Test circuit pack, the TN778 Packet Control Circuit Pack
(PKT-CTRL), the TN570 Expansion Interface circuit pack (EXP-INTF), and on the
ISDN-BRI circuit packs (BRI-BD). Packet Bus tests may abort if some of this
hardware is not present in the system. Also, these tests may yield inconsistent
results if some of this hardware is defective.
The interactions between the Packet Bus and the circuit packs that use the bus
are complex. For this reason, the Packet Bus can be alarmed due to a circuit
pack failure and, conversely, circuit packs can be alarmed due to a Packet Bus
failure. Chapter 9, ‘‘
Packet Bus Fault Isolation and Correction’’ describes Packet
Bus maintenance and also the interactions of the bus with the Packet circuit
packs. The chapter discusses fault isolation and correction procedures, and it
should be referenced for all procedures and required decisions. The "Packet Bus
Fault Isolation Flowchart" section of Chapter 9 is the normal starting point in the
chapter for experienced technicians. However, technicians who are unfamiliar
with the Packet Bus and its use should refer to the introductory material. This
section on PKT-BUS is limited to a description of the Error and Alarm Log entries
for the Packet Bus maintenance object and to a description of the Packet Bus
test sequence.
A failure of one or more circuit packs that use the Packet Bus can cause a Packet
Bus alarm. In addition, a Packet Bus failure can cause loss of service to one or
more such circuit packs, as well as to the ports and endpoints associated with
the ISDN-BRI circuit pack (BRI-PORT, ABRI-PORT, BRI-SET, BRI-DAT, and
1. Where P is an appropriate port network number determined from the PORT field on the Alarm
or Error Log.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run
1
Full Name of MO
PKT-BUS MAJOR test pkt P l r 2 Packet Bus
PKT-BUS MINOR test pkt P l Packet Bus
PKT-BUS WARNING test pkt P l Packet Bus