Circuit Pack Descriptions
Issue 8.0 July 2002
7-41
Power Circuitry 7
The DS3 circuit pack receives two sources of −48 volts that are diode OR'd, fused,
and filtered. A modular DC-to-DC power converter produces +5 volts used on the
circuit pack. The LSSW circuit packs supply power to the input and output
protection relays on the DS3 circuit packs.
If the DS3 circuit pack detects a failure of the onboard fuse or power converter, the
red FAULT LED will light. If the fuse or power converter fails, the LNCTL circuit
pack provides +5 volts to light the FAULT LED on the DS3 circuit pack.
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