Cisco Systems Cisco 12008 manual Adding, Removing, or Replacing a DC-Input Power Supply

Adding, Removing, or Replacing a DC-Input Power Supply

• If the OUTPUT FAIL LED behaves as expected, proceed with normal system operations.

• If the OUTPUT FAIL LED remains on when the new power supply is installed and powered up, the power supply may be faulty, or an adverse environmental condition may exist in the router, such as an overvoltage or overtemperature condition that causes the power supply to shut down.

• If two AC-input power supplies are installed and the OUTPUT FAIL LED illuminates on only one power supply, the associated power supply itself may be faulty, or source power for that unit may be faulty.

• If the OUTPUT FAIL LEDs on both power supplies go on, each of which is connected to a separate AC power source, you can assume that an overvoltage or overtemperature condition in the router is causing both power supplies to fail. Also, the OUTPUT FAIL LEDs could be on due to a defective MBus controller or an old version of MBus code.

If the new AC-input power supply fails to operate properly after several attempts to power it up as described above, contact your Cisco service representative for assistance.

Adding, Removing, or Replacing a DC-Input Power Supply

The Cisco 12008 can operate with either one or two DC-input power supplies. Although the router supports an online insertion and removal (OIR) capability for field replaceable units (FRUs), you must observe the following rules regarding the DC-input power supplies:

•If your Cisco 12008 is configured with a single DC-input power supply, you must power down the system before replacing the unit.

•If your Cisco 12008 is configured with two DC-input power supplies, you can remove and replace one of the power supplies while the other unit remains operational.

Maintaining the Cisco 12008 7-17