Nortel DMS-100 Series Maintenance Manual page 126

2-50 Functional overview
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297-8361-550 Standard 04.02 December 2004
originations and terminations, this negligible delay is the only impact on
call processing.
The Talk Battery Alarm feature can detect the loss of talk battery feed to
an LCM shelf. Detection of the loss of talk battery return cannot occur
because of WLC limits. This limit is not important because talk battery
returns are duplicated and the occurrence of return failures is not common.
Refer to the previous figure "Talk battery distribution on RLCE frame".
The CM does not test talk batteries while the LCM, or one of the CM
C-side nodes, is in the overload condition.
The Talk Battery Alarm feature isolates shelf-level failures of talk battery
feed. The talk battery feed failures that this feature always reports are
failures that affect talk battery for lines on the LCM shelf. This feature
does not always detect drawer-level failures. The drawer where the WLC
resides and the drawer in which the failure occurs determines if this feature
detects Drawer-level failures.
Particular faults local to the WLC or the WLC drawer can prevent the
correct detection of talk battery failures. These faults include faults that
cause the WLC to fail line card diagnostics. When these faults occur, the
WLC can report talk battery failure incorrectly. This event causes the
critical alarm when talk battery can occur for other lines on the shelf.
These occurrences are not common. The critical alarm log report PM179
gives the location of the WLC to help troubleshoot these conditions.
The Talk Battery Alarm feature does not affect ESA operation on RCC,
OPM. Talk battery alarm conditions or reports are ignored during ESA
operation. The system does not report talk battery failures when an LCM
is in ESA mode. On exit of ESA mode, the CM diagnoses the LCM to
determine if talk battery failures are present.
The Talk Battery Alarm feature activates for an office. Ten min can pass
before every LCM in the office begins talk battery failure audits. The time
the LCM audit requires to cycle through every LCM in the office
determines this delay time. An office with heavy traffic and a large number
of LCMs can require longer than 10 min.
The SERVORD OUT command deletes the directory number (DN)
assigned to the last WLC on an LCM shelf. When this event occurs, a
minor Cannot test Talk Battery alarm occurs. The alarm
message indicates the WLC for which the last assigned DN is deleted.
When this condition occurs, the WLC is HASU. The WLC is not in a
normal maintenance state. This state does not allow the LCM to use the