Alarming Based On Service States; Ds1 Isdn Trunk Service States - Avaya G700 Maintenance Manual

6 Avaya MultiVantage Software-Controlled Maintenance:
ISDN-PRI signaling group ( FAS or NFAS ) to which it belongs. For more details, refer to ISDN-SGR
and "DS1-MM (DS1 Interface Media Module)" in this chapter.
For interfaces using country protocol 1 on the DS1 Media Module administration form (including
US), the signaling protocol used for the maintenance of the B-channel is defined by the ISDN-PRI
specification. For interfaces using country protocols other than 1, the signaling protocol used for the
maintenance of the B-channel is defined by the CCITT ISDN-PRI Specification.
There are five possible service states for a B-channel. the service state is negotiated with the far-end
switch, changes over time, and may have a far-end and near-end components. The service state is
initialized to out-of-service/Far-End and an attempt is made to negotiate it to in-service.
The ISDN-PRI Specification defines the possible SERVICE STATES for a B-channel. The service
state is negotiated with the far-end switch, changes over time, and may have a far-end or near-end
component. The service state is initialized to the Out-Of-Service/Far-End state and an attempt is
made to negotiate it to In-Service.
Note: The service state of a particular DS1 ISDN Trunk B-channel can be displayed by
issuing the status trunk trunk group/trunk member system technician command.
When a call is present, the specification defines the permissible call states as well. There are tests in
the short and long test sequences for DS1 ISDN Trunk designed to audit these states and ensure
agreement between both ends of the PRI connection.

Alarming Based on Service States

A warning alarm is logged against a DS1 ISDN B-channel trunk when it is placed in the
Maintenance/Far-End or Out-Of-Service/Far-End states, during which the trunk is unusable for
outgoing calls. When a warning alarm is present, use status trunk group#/member# command to
determine the exact state. Other alarms can be diagnosed by using the short and/or long test
sequences. Note that an ISDN B-channel trunk can be placed in a Far-End service state by either
action taken by the far-end switch or by failure of the far-end switch to respond. For example, if the
far-end does not respond to a Remote Layer 3 Query (Test #637 for ISDN-SGR), the associated DS1
ISDN trunk B-channels will be placed in the Maintenance/Far-End service state.
As a port on a DS1 Media Module (DS1-MM), and as part of a signaling group dependent on a D-
channel (ISDN-LNK) for signaling, operation of the ISDN-TRK is dependent on the health of these
other maintenance objects.

DS1 ISDN Trunk Service States

The status trunk command displays the following possible service states for ISDN trunks.
gives recommended procedures for each state.
• In-Service ( INS )
The B-channel is in its normal operating state.
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ISDN-TRK (DS1 ISDN Trunk)
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002
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