ADC PCS-822, Technical Practice, Page: 39 / 46

January 6, 2003 SCP-PCS822-021-03H
ADC Telecommunications, Inc.
29
P
OWER
The Field Shelf uses –48 Vdc power and must be fused at the source. The fuse rating depends on the services
provided by the PCS-822. Refer to
Table 9 on page 30 for fusing recommendations.
DC Power Connections
The power is connected through a power cable that provides connections for dual –48 Vdc and common battery
return (
Table 8 ). The power cable wires are identified by the numbers 1, 2 and 3 and also by the words one, two and
three printed on the wires ( Figure 23 ). The 200-mechanics slots are wired only to the A Battery supply
(Note on page 1).
Table 8. Power Cable
Figure 23. PCS-822 3-Pair Power Cable
DANGER
Failure to properly fuse the PCS-822 can result in personal harm, damage to equipment, or loss
of service.
DANGER
There is a shorting bar that is installed between BAT A and BAT B of the Field Shelf. If only BAT
A is connected, -48 Vdc will also appear on the unterminated end of BAT B wire. Remove the
shorting bar to provide redundant power through the BAT A and BAT B leads. Access to this
shoring bar is achieved by removal of the Field Shelf rear panel.
POWER CABLE CIRCUIT ASSIGNMENTS
PAIR #
PROTECTOR
SOCKET COLOR DESCRIPTION
1 WHITE 1 BATTERY A
BLACK 1 BATTERY A RETURN
2 WHITE 2 BATTERY B
BLACK 2 BATTERY B RETURN
3 24 WHITE 3 AC POWER ALARM IN (NO)
BLACK 3 AC POWER ALARM IN (COM)
Pair Numbers