Nortel DMS-100 Series Maintenance Manual page 122

2-46 Functional overview
talk battery. The loss of talk battery affects one or two LCM shelves. The
location of the fault determines the affected LCM shelf.
Without talk battery, the LCM line cards cannot signal an off-hook condition.
The LCM recognizes any off-hook line as on-hook. Any LCM calls are forced
to the on-hook state during the loss of talk battery feed. The LCM lines cannot
originate and terminate calls while talk battery is absent.
Feature activation
The change of the value of office parameter TALK_BATTERY_ALARM in
table OFCENG, controls activation of the Talk Battery Alarm feature. Default
disables the Talk Battery Alarm feature. A WLC must be provisioned in each
LCM shelf in the office before this feature is enabled. In any other condition,
a minor alarm occurs for each LCM shelf that does not contain a WLC.
After the Talk Battery Alarm feature is enabled, talk battery tests are
performed through diagnostics and background audits.
When the Talk Battery Alarm feature is disabled, any talk battery alarms and
ISTb reasons that this feature introduces are cleared.
Background audit
Each LCM can audit shelves for loss of talk battery. The Talk Battery Alarm
feature can be disabled. When this event occurs, audits do not run to check for
the loss of talk battery on any of the LCMs in the office.
When the Talk Battery Alarm feature is enabled, a search is performed to find
an available WLC on each LCM shelf. A WLC must be in one of the following
states to be available:
•
•
When an available WLC is not found, the system generates a minor alarm log
report (PM179). This log report indicates that talk battery cannot be tested.
The LCM becomes ISTb. When an available WLC is found, a special audit
runs a minimum of one time every minute. This audit checks for loss of talk
battery feed. All LCM shelves are tested at the same time. The tests make sure
LCM shelf is checked a minimum of one time each minute. Audits do not run
talk battery tests on an OOS LCM.
When the available WLC in use for audit testing becomes not available, the
audit searches to find another available WLC. When the audit finds another
available WLC, audit tests continue with the new WLC. When the audit does
not find an available WLC, the system generates a minor alarm log report
(PM179). This log report indicates the system cannot test the talk battery. The
LCM shelf is set to ISTb.
297-8361-550 Standard 04.02 December 2004
hardware assigned, software unassigned (HASU)
InSv and assigned to a subscriber