2
October
2004
8820-A2-GZ45-20
Wiring the PEM
HANDLING PRECAUTIONS FOR
STATIC-SENSITIVE DEVICES
This product is designed to protect sensitive components from damage
due to electrostatic discharge (ESD) during normal operation. When
performing installation procedures, however, take proper static control
precautions to prevent damage to equipment. If you are not sure of the
proper static control precautions, contact your nearest sales or service
representative.
Each PEM is equipped with an internal 35 amp (Model 8820-S2-903) or 40 amp
(Model 8820-S1-906) circuit breaker. Two separate, unswitched, individually fused
power sources, each capable of safely handling this load, are required for power
redundancy.
The PEMs require 8 AWG wire for their power connections. If stranded wire is
used, do not solder–coat the ends of the wires as this could weaken the
connections.
Although power may be connected to the front of the PEMs, it is recommended
that these connections be made at the rear of the chassis. Either way will work, but
all power inputs must be made either to the front or to the rear of the chassis, not
both.
NOTE:
Both PWR A and PWR B must be powered, else the management card alarm
will be activated.
Figure 2.
PEM with Internal Power Terminals
!
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
TN
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
TN
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
