Maintaining the Cisco12008 7-17
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 Cisco12008 is configured with a single DC-input power supply, you must power
down the system before replacing the unit.
•If your Cisco12008 is configured with two DC-input power supplies, you can remove
and replace one of the power supplies while the other unit remains operational.