8820-A2-GZ45-20
October 2004
1
Replacement DC Power Entry Module
for the 8820 Broadband Access Concentrator
Models 8820-S2-903 and 8820-S1-906
Installation Instructions
Document Number 8820-A2-GZ45-20
October 2004
DC Power Entry Module for the 8820 BAC
The plug-in Power Entry Module (PEM) is used in the 8820 Broadband Access
Concentrator (BAC), model 8820-A2-5xx, to provide 48 V or 60 V power isolation
and distribution, overcurrent protection, and power filtering and monitoring. The
Model 8820-S2-903 PEM accepts –48 VDC, and the Model 8820-S1-906 PEM
accepts –48 VDC or –60 VDC.
Figure 1.
8820 Broadband Access Concentrator
The 8820 BAC is shipped with two PEMs installed.
The PEM consists of a printed wiring board (PWB) attached to an L–shaped
faceplate. The PWB holds the electronic circuitry, including a faceplate–mounted
circuit breaker and power input connectors. The PEMs mate with connectors on
the backplane of the BAC. The L–shaped faceplate provides a shelf for dressing
and protecting the wiring and serves as a handle for insertion and removal.
Two PEMs (with separately fused power sources) are always required to provide
power redundancy. When installed in the chassis:
The module on the left is identified as PEM A and handles the A power source.
The module on the right is identified as PEM B and handles the B power
source.
00-16543-01
Power
Entry
Modules
ALARMS
Major Minor
Fan
B
A
POWER
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 AT THE S
OURCE
BEFORE REMOVING OR INSTALLING THIS PWR ENTRY MODULE
48V R
TN
48V NEG
POWER ENTRY MODULE
LEFT UNIT: LINE A
RIGHT UNIT: LINE B
WARNING! POWER MUST BE DISCONNECTED AT THE S
OURCE
BEFORE REMOVING OR INSTALLING THIS PWR ENTRY MODULE
DSL
SYSTEM
OK
Alm
Test
ETHERNET
TX
RX
Coll
DSL PORT
1
2
3
4
MCP
SYSTEM
OK
Alm
Test
ETHERNET
TX
RX
Coll
