Nortel DMS-100 Series Maintenance Manual page 111

Battery strings and string pairs
Battery string
0 and 4
1 and 5
2 and 6
Battery string pairs can connect to the load bus, charge bus, discharge bus or
none of these (open circuit). Moves from the load to charge bus or charge to
load bus must occur through the open-circuit state.
The OPMPES software makes sure of this move. Battery string pairs
normally connect to the load bus.
CAUTION
Loss of service
Make sure that one or more battery string pair remains on
the load bus at all times.
Modular supervisory panel (NTRX40AA)
The MSP (NTRX40AA) is in bay 1 in the OPAC cabinet. The MSP
provides alarm control, power circuit protection and talk battery filtering for
the OPAC.
The MSP allows different accessories to be mounted on the rear. Slots 16
through 19 are available for optional fuse or breaker modules and MSP
accessories to be mounted on the rear. Use these modules to power NT
transmission equipment or customer-provided equipment.
Talk battery module (NTRX44AA)
The NTRX44AA talk battery module provides a filtered power feed of a
maximum of 20A. Each card provides inrush current protection (soft-start)
to protect against breaker trips. Each talk battery module occupies two card
positions in the MSP.
This connectorized module provides power input and output through power
ports and alarm output (fail and loss-of-power) through two 2-pin
connectors.
The assembly includes a faceplate mounted light-emitting diode (LED),
printed circuit board (PCB) mounted filter capacitors and an inductor. A
DMS-100 Family OPAC Maintenance Manual XPM12 and up
OPAC maintenance overview 2-17
Battery string pair
0
1
2