Overview of the Cisco 12008
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
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Rotary Power Switch

The rotary power switch on the power supply faceplate (see Figure1-6) applies a source
AC voltage to the power supply. This switch also actuates an onbo ard circuit breaker and a
latching mechanism that prevents the power supply from being inserted into or removed
from the power supply bay when the switch is in the ON (1) position.
When you rotate the rotary power switch 90 degrees to the ON position, the following DC
operating voltages are supplied to the backplane:
•+5.2 VDC
•–48 VDC

Source AC Input Connector

The source AC receptacle on the power supply faceplate (see Figure1-6) enables an
external AC power source to be connected to the power supply. This connector is equipped
with a latch that prevents accidental or unintended removal of the AC power cord.
The power specifications for the AC-input power supplies, as well as the source AC power
cables available for use with the Cisco 12008 router, are described in Chapter2 in the
section entitled “AC-Powered Systems.”

AC-Input Power Supply LEDs

The AC-input power supply faceplate incorporates two LEDs (see Figure1-6) that provide
the following status indications:
•AC INPUT O K—When the rotary power switch is turned ON, this green LED goes on,
indicating that source AC power has been applied and that it is within the specified
operating range. If this LED does not go on when the rotary power switch is turned ON,
it indicates that source AC power is not within the specified operating range or that the
LED is faulty.
•OUTPUT FAIL—When the rotary power switch is turned on, this LED goes on
momentarily; it should then go off and remain so. If it does not go off, it indicates that
the +5.2 VDC or –48VDC being su pplied to the backplane is not within tolerance.