DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-374CARR-POW (Carrier Power Supply)
9
Figure 9-19 shows AC power distributio n in some Multi-Carrier Cabinets. The DC
power distribution cables are on both sides of the cabinet. These cables supply
power to each of the carriers. The optio nal battery charger is at t he right side of
the power distribution unit.
Figure 9-19. AC Power Distribution in Multi-Carrier Cabinets
Power Backup
If AC power fails, three 48 VDC batteries power the system for 10 sec onds in a
PPN cabinet, for 15 seconds in an EPN cabinet, and for 10 minutes in the control
carrier in a standard reliability system. The batteries also supply system power
for five minutes in the control carrier in hig h and critical reliabil ity systems, and for
10 minutes in the expansion control c arrier in the “A” posit ion of an EPN cabinet
(Release 5r only).
3
2
"C"Position
Carrier
"B"Position
Carrier
"A"Position
Carrier
"D"Position
Carrier
Battery
Charger
(Optional)
"E"Position
Carrier
"F"Position
FanUnit
Power
Distribution
Unit
mcc4_g3RBP 0416 96