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 distribution 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 optional battery charger is at the 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 seconds 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 high and critical reliability systems, and for
10 minutes in the expansion control carrier in the “A” position 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
Fan Unit
Power
Distribution
Unit
mcc4_g3 RBP 041696
