Specifications

5-5
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 5 Maintenance
Replacement Procedures
Warning Before working on equipment that is connected to power lines, remove jewelry
(including rings, necklaces, and watches). Metal objects will heat up when connected
to power and ground and can cause serious burns or weld the metal object to the
terminals.
To remove a PEM, complete the following steps:
Step 1 Power OFF the central office circuit breaker connected to the PEM you are removing and tape the switch
in the OFF position.
Step 2 Attach an ESD-preventive wrist strap between you and an unpainted chassis surface.
Step 3 Power OFF the power switch located on the PEM front panel. (See Figure 5-4.)
Caution Terminal blocks may be energized. Ensure that the power source circuit breaker is
disconnected and the PEM power switch is in the OFF (O) position before accessing
terminals.
Figure 5-4 PEM Front Panel
Step 4
Using a 1/4-in. flat-blade screwdriver, disconnect the DC cables from the DC-input power terminal
block. (See Figure 5-4.)
Step 5 Unplug the alarm cable from the bell alarm terminal block. (See Figure 5-4.)
Step 6 Using a 1/4-in. flat-blade screwdriver, loosen the captive screws on the PEM front panel.
–48V –48V
RTN
C
NC
NO
P
O
W
E
R
M
I
S
W
I
R
E
–48V –48V
RTN
C
NC
NO
P
O
W
E
R
M
I
S
W
I
R
E
C
NC
NO
–48V
–48V
RTN
POWER
MISWIRE
LEDs
DC-input power
terminal block
Bell alarm
terminal block
To CO
alarms
To DC
power
source
10138
Captive screw
Power switch