8800-A2-GZ41-20
June 2004
3
Connecting the Power Supply to the BAC
Power Entry Modules (PEMs) installed in the front of the BAC provide –48 VDC
power distribution, a 35-amp circuit breaker, power line filtering and input power
monitoring. They are designated PEM A (on the left) and PEM B (on the right). All
input power is distributed to the system via the PEMs, so that if one PEM or one
power source fails, power will be supplied through the other PEM automatically
without service interruption. Power inputs may be connected to the PEMs at the
front of the BAC using the PEM’s terminal blocks, or at the terminal block on the
back of the BAC. This document shows the recommended technique, with
connections at the rear of the BAC. See the
8820 Broadband Access Concentrator
Installation Guide
for more information.
Review the following procedures and determine which is appropriate for your
configuration. The recommended configuration is two power modules connected
to one BAC (providing a redundant power source). For all configurations:
Make sure that the AC power cords are not connected to the power supply
until other wiring is completed.
Use 8 AWG solid or stranded wire.
Attach ring tongue terminals to the ends of the wires to be connected to the
BAC power terminal block. See the
8820 Broadband Access Concentrator
Installation Guide
for more information.
Attach ring tongue terminals to the ends of the wires to be connected to the
power supply.
Strip 1/2 inch of insulation from the ends of the wires to be fastened at split
bolt connectors or the grounding lug of the BAC.
CAUTION:
The following procedures must be performed by a trained technician.
SERIAL
SMCM
CLOCK
A
ALARM
2
4
6
8
10
12
14
16
18
1
3
5
7
9
11
13
15
17
LAN/WAN SLOT
B
CLOCK
B
A
SERIAL
MCC
AC
ALARM
48V R
T
N
48V NEG
POWER ENTRY MODULE
LEFT UNIT: LINE A
RIGHT UNIT: LINE B
WARNING! POWER MUST BE DISCONNECTED A
T THE SOURCE
BEFORE REMOVING OR INSTALLING THIS PWR ENTR
Y MODULE
48V R
T
N
48V NEG
POWER ENTRY MODULE
LEFT UNIT: LINE A
RIGHT UNIT: LINE B
WARNING! POWER MUST BE DISCONNECTED A
T THE SOURCE
BEFORE REMOVING OR INSTALLING THIS PWR ENTR
Y MODULE
00-15326a-02
PEM
Circuit
Breaker
48V R
T
N
48V NEG
POWER ENTRY MODULE
LEFT UNIT: LINE A
RIGHT UNIT: LINE B
WARNING!
POWER MUST BE DISCONNECTED AT THE SOURCE
BEFORE REMOVING OR INSTALLING THIS PWR ENTRY MODULE
O
PEM
A
PEM
B
