Nortel DMS-100 Series Maintenance Manual page 65

If the available WLC used for audit testing becomes not available, the audit
searches for another available WLC. If the audit finds another available
WLC, audit testing continues with the new WLC. If the audit does not find
an available WLC, the system generates a minor alarm log report (PM179).
This log report indicates that the system cannot test the talk battery, and that
the LCM shelf is set to ISTb.
To test for loss of talk battery feed, the system performs the following
action. The system instructs WLC to verify that talk battery feed to the
WLC is present. The test passes if talk battery feed is present and fails if
talk battery feed is not present.
If off-hook, call processing busy (CPB), or both, occupy INSV WLC, the
audit does not perform the talk battery test. The system assumes that the
talk battery test passes. Examples of occupied states include talking, ringing
and maintenance lockout. For ringing, the WLC is on-hook and in a CPB
state.
When the audit finds a failure of the talk battery test, the system generates a
critical alarm log report (PM179). The system places the LCM shelf in an
ISTb state. The audit does not again report the failure until diagnostics clear
the alarm and ISTb state.
Diagnostics
The INSV and OOS diagnostics for an LCM unit incorporate the talk battery
test. The affected diagnostics include the following commands:
Tst Unit unit_no
Tst PM
Tst Rex NOW
Rts Unit unit_no
Rts PM
Diagnostics report all talk battery failures. This action also occurs if the
system tests the same LCM repeatedly. If the talk battery test passes, the
diagnostics clear the alarm and ISTb reason. The manual and automatic
versions of these commands are impacted. The diagnostics only run talk
battery tests when the talk battery alarm feature is enabled.
To support the talk battery alarm feature, each LCM shelf must have a WLC.
There are no provisioning rules that specify where the WLC can reside in
the shelf. The maintenance line card in LSG 0 Card 0 for the LCM shelf can
be assigned as a WLC. In this event, the feature does not always use this
card, because this line card tests the ringing generators.
DMS-100 Family OPAC Maintenance Manual XPM12 and up
Maintenance overview 1-49