Nortel DMS-100 Series Maintenance Manual page 121

Figure 16 Talk battery distribution on RLCE frame
RLCE
FSP
RMM
cooling baffle
LCA–1
LCA–0
cooling baffle
Talk battery return
For redundancy of return
The A feed provides talk battery for LCA-1 and the B feed provides talk
battery for LCA-0. The feeds are not redundant, which can affect up to 320
subscriber lines. Some redundancy with the talk battery returns to avoid an
outage by a single fault.
In the past, operating company personnel did not receive an indication of a
problem before a loss of talk battery unless the talk battery fuse had blown.
The LCM indicates InSv (in service) on the MAP display to indicate a blown
fuse. The LCM performs a line card audit. This audit cannot check for loss of
DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up
HIE
Talk battery fuses
Talk battery A feed
Talk battery
fuses
Talk battery B feed
Functional overview 2-45
Power
distribution
center