Cisco XR 12406 - Manual (Page 190)

Chapter 5 Maintaining the Router
Removing and Replacing a DC PEM
5-26
Cisco XR 12406 Router Installation Guide
OL-13831-01
Step 14 Set the power switch on both power supplies to the on (1) position.
The AC Input Power and DC Output Power indicators on the power supplies
should be on. If the indicators do are not on, see the
“Troubleshooting the AC
Power Entry Module Installation” section on page 5-17 .
Removing and Replacing a DC PEM
Although a DC PEM supports OIR, in order to maintain operational redundancy,
proper cooling, and meet EMI compliance standards, you must have both working
power supplies installed. When you remove a failed power supply with the router
in operation, perform the replacement as quickly as possible. Make sure you have
the tools and the replacement power supply ready before beginning the removal
and installation procedure.
Use the following procedure to remove and replace a DC PEM.