Circuit Pack Descriptions
Issue 8.0 July 2002
7-105
Power Circuitry 7
The OC48 TRMTR A/D circuit pack receives two sources of −48 volts that are
diode OR'd, fused, and filtered. Modular DC-to-DC power converters produce +5,
−5.2, +15 and −2 volts used on the circuit pack.
The OC48 TRMTR A/D circuit pack monitors the two −48 volt sources to the
circuit pack and any failures are reported to the board controller. If the OC48
TRMTR A/D circuit pack detects a failure of the onboard fuse or power converter,
the red FAULT LED will light. If the fuse or +5 volt power converter fails, the
LNCTL circuit pack provides +5 volts to light the FAULT LED on the OC48
TRMTR A/D circuit pack.
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