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Power
Issue 1 December 1997 4-3
Circuit Packs 4
OLIU Circuit Packs 4
The 21D/21D-U OLIU circuit pack is powered by a −48 volt to +5 volt DC-to-DC
converter mounted on the circuit pack. The backplane power feeders supply A
and B −48 volts to this converter via diode ORed circuits and fuses mounted on
the circuit pack.
The 21G/21G-U OLIU circuit pack is powered by two DC-to-DC converters
located on the circuit pack. The backplane power feeders supply A and B −48
volts to these converters via diode ORed circuits and fuses mounted on the circuit
pack. One converter supplies +5 volts and one supplies −5.2 volts for the circuit
pack.
The 23G/23G-U and 23H/23H-U OLIU circuit packs are powered by four DC-to-
DC converters located on the circuit packs. The backplane power feeders supply
A and B −48 volts to these converters via diode ORed circuits and fuses mounted
on the circuit packs. One converter supplies +5 volts, one supplies −5.2 volts, one
supplies −2.3 volts, and one supplies +15 volts for the circuit packs.
TSI, TGS/TG3, 3DS3, and 3STS1E Circuit Packs 4
The BCP3 TSI, BBF2B/BBF4 TGS/TG3, 3DS3, and 3STS1E circuit packs are
powered by a −48 volt to +5 volt DC-to-DC converter mounted on each circuit
pack. The backplane power feeders supply A and B −48 volts to this converter via
diode ORed circuits and fuses mounted on the circuit pack. The converter
provides +5 volts DC power for TSI, TGS/TG3, 3DS3 and 3STS1E circuit packs.
Control Circuit Packs 4
The SYSCTL and OHCTL circuit packs are each powered by a −48 volt to +5 volt
DC-to-DC converter located on the pack. The backplane power feeders supply A
and B −48 volts to these converters via diode ORed circuits and fuses mounted on
the circuit packs.
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