Service Manual

GSM-204-323
MicroBCU power supply module (BPSM)
31st Oct 01
Tech. 4–36
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
MicroBCU power supply module (BPSM)
Introduction to
the BPSM
This section describes the BCU power supply module (BPSM). The BPSM,
located in the digital module shelf of the main cage, supplies regulated dc power
to the digital modules.
A single master BPSM mounted in the lower half of the digital module shelf can
provide sufficient power for:
 One MCUF.
 One FMUX.
 Two NIUs.
 The alarm module.
An optional second BPSM can be fitted in the upper half of the digital module
shelf to supply any or all of the following:
 Backup power to the alarm module, which is the only digital module
supplied by both BPSMs (for redundancy).
 Optional redundant MCUF and associated FMUX.
 Power for up to two additional NIUs.
During normal operation, with all the outputs within their regulation limits, a
green LED located on the front panel is illuminated. No alarms are generated
by the BPSM.
BPSM diagram
Figure 4-21 shows a BPSM.
ig.274.rh
BACKPLANE
CONNECTOR
GREEN LED
Figure 4-21 BPSM view