Nortel DMS-100 Series Maintenance Manual page 115

Maintenance block The NTRX41AA provides maintenance features like
jacks for telephone, data and ABS. These features provide for interoffice
communication and data transmission. These features require dedicated FX
facilities.
The relationship between the functional blocks appears in the following
figure.
NTRX41AA functional blocks
Fuse modules
Fan alarm
module
Inverter
Talk battery
filter 1
Talk battery
filter 2
Fuse module (NTRX43AA)
The NTRX43AA fuse module provides a maximum of eight current-limited
feed outputs and one alarm output. Each of these cards occupies one card
position. The MPS provisions three card positions.
This module does not contain the eight QFF fuses. The cabinet level
supplies the fuses. The connectorized module provides separate power input
ports for two groups of four fuses each. This module also provides an
18-pin output power output connector.
ABS
Alarm circuit
Visual indicators
Maintenance
NTRX41AA
DMS-100 Family OPAC Maintenance Manual XPM12 and up
OPAC maintenance overview 2-21
Breaker
modules
Visual indicators
MAP terminal