DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-378CARR-POW (Carrier Power Supply)
9
Figure 9-23. DC Power Distribution Unit (J58890CF-2) — Front
Some carriers may contain two power supplies, the 644A and the 645B, which
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.
Loss of the 645B Carrier Port Power Supply in the active PPN control carrier
causes the management terminal login to drop. In a system with duplicated SPEs
CARR-POW alarms do not cause an interchange, but loss of power to PROC,
MEM-BD, SW-CTL, SYSAM, and PKT-INT maintenance objects (powered from
the left side of the active control carrier) reduces the SPE state of health, possibly
causing an interchange. Loss of power on the right side of the active control
carrier causes the HOST-ADAPTER, DISK, and TAPE maintenance objects to fail,
these failures do not cause an SPE interchange.
4
2
Circuit
Breakers
DC Power
Distribution
Unit
Ring
Generator
Terminal
Block
mcc_dc_1 PDH 062696
