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Communication Manager Maintenance-Object Repair Procedures
778 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
DC-Powered Cabinets
DC Power-Distribution Unit (J58890CF-2)
Figure 43: DC Power-Distribution Unit (J58890CF-2): Front on page 778 shows a
power-distribution unit in some DC-powered multicarrier cabinets. The unit sits at the bottom of
the cabinet and contains the ring generator, 20-Amp circuit breakers, terminal blocks, and
system fan power.
Figure 43: DC Power-Distribution Unit (J58890CF-2): Front
Some carriers may contain two power supplies, the 644A and the 645B, that together supply the
required voltages to the carrier. Other carriers may contain one 649A power supply located on
the right side of the carrier. In these systems, an additional 649A is located on the right of the
optional switch node carriers.
Figure 44: Typical Multicarrier Cabinet with 649A Power Units
on page 779 shows a typical
AC-powered multicarrier cabinet.
4
2
Circuit
Breakers
D
C
Power
Distribution
Unit
Ring
Generator
Termina
l
Block
mcc_dc_1 PDH 062696