363-206-285
Power
Issue 3 June 2001
4-3
Circuit Packs 4
OLIU Circuit Packs 4
The OLIU circuit packs are powered by two 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 are fuse-mounted on each of the circuit
packs. One converter supplies +5 volts and the other supplies −5.2 volts.
TG Circuit Packs 4
The TG circuit packs are powered by −48 volt to +5 volt DC-to-DC converters
located on the packs. The backplane power feeders supply A and B −48 volts to
these converters via diode ORed circuits and a fuse mounted on each of the
circuit packs. The converters provide +5 volts DC power for the TG circuit packs.
DS3/TMUX Circuit Packs 4
The DS3/TMUX circuit packs are powered by −48 volt to +5 volt DC-to-DC
converters located on the packs. The backplane power feeders supply A and B −
48 volts to these converters via diode ORed circuits and a fuse mounted on each
of the circuit packs. The converters provide +5 volts DC power for the DS3/TMUX
circuit packs.
STS1E Circuit Packs 4
The STS1E circuit packs are powered by −48 volt to +5 volt 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. The STS1E circuit packs provide +5 volt DC power for their associated
DS1/DS1PM circuit packs.
MXRVO Circuit Packs 4
The MXRVO circuit packs are powered by −48 volt to +5 volt 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. The MXRVO circuit packs provide +5 volt DC power for their associated
DS1/DS1PM circuit packs.
DS1/DS1PM/HDSL/T1EXT/LAN Circuit Packs 4
The DS1/DS1PM/HDSL/LAN circuit packs receive +5 volt power via backplane
connections from the MXRVO circuit packs. The DS1/DS1PM/HDSL packs in the
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