Maintaining the Cisco12008 7-7
Adding, Removing, or Replacing an AC-Input Power Supply
Adding, Removing, or Replacing an AC-Input Power
Supply The Cisco 12008 can operate with either one or two AC-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 AC-input power supplies:
•If your Cisco12008 is configured with a single AC-input power supply, you must power
down the system before replacing the unit.
•If your Cisco12008 is configured with two AC-input power supplies, you can remove
and replace one of the power supplies while the other unit continues to supply power to
the router.
You need the following to add, remove, or replace an AC-input power supply:
•1/4-inch flat-blade screwdriver (to loosen/tighten the captive installation screw on the
power supply faceplate)
•A replacement AC-input power supply and the applicable AC power cord for your site
Note To find out which type of AC-input power supply you need for your Cisco 12008,
refer to the Cisco 12008 Gigabit Switch Router AC-Input Power Supply Replacement
Instructions publication.
Caution You cannot use an AC-input power supply and a DC-input power supply in the
same chassis.

Adding an AC-Input Power Supply

In the following procedure, it is assumed that you will be adding a second AC-input power
supply to the router. In this case, it is also assumed that a blank filler panel has previously
been installed in the vacant power supply bay.
Note A vacant power supply bay must always be covered with a blank filler panel to
ensure EMI compliance and the proper flow of cooling air through the router.