Cisco AS5800 Specifications Page 182

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5-4
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 5 Maintenance
Replacement Procedures
Replacing a DC Power Entry Module
This section explains how to remove and replace the power entry modules (PEMs) in the dial-shelf
chassis.
Note The color coding of the DC-input power supply leads depends on the color coding of the
DC power source at your site. Typically, green or green/yellow is used for ground, black
is used for +48V (return), and red or white is used for 48V. Verify that the lead color
coding for the DC-input power supply matches the color coding at the DC power source.
Tools and Parts Required
To replace a PEM you need the following items:
New PEM (DS5814-DC-PEM=)
6 American Wire Gauge (AWG), or 10 mm
2
, cable rated for at least 140
o
F (60
o
C) (for new
DC-input power supply installations)
Standard wire stripper
No. 2 Phillips screwdriver
1/4-in. flat-blade screwdriver
ESD-preventive wrist strap
Removing a Power Entry Module
This section explains how to remove and replace the PEMs in the dial-shelf chassis.
Warning
Before completing any of the following steps, and to prevent short-circuit or shock
hazards, ensure that power is removed from the DC-input or optional AC-input circuit. To
ensure that all power is OFF, locate the circuit breaker on the panel board that services
the DC-input or optional AC-input circuit, switch the circuit breaker to the OFF (O)
position, and tape the switch handle of the circuit breaker in the OFF (O) position.
Warning
When installing the unit, the ground connection must always be made first and
disconnected last.
Caution If your system requires the AC-input power shelf for AC-to-DC conversion, you should
schedule a time for system maintenance and replace the PEM at that time.
The following procedure for hot-swapping a PEM assumes you are not using the optional AC-input
power shelf, and that each PEM in your dial shelf is connected to a separate DC power source. If you
are removing and replacing a PEM in an AC-configured system, you must perform the replacement
during a scheduled maintenance time and power off the entire system.
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