Product Overview 1-23
Overview of the Cisco 12008
The power specifications for the DC-input power supplies, as well as the specifications of
the source DC power cables for use with the Cisco 12008 router, are presented in the section
entitled “DC-Powered Systems” on page 16 in Chapter 2.

DC-Input Power Supply LEDs

The DC-input power supply faceplate incorporates two LEDs (see Figure1-7) that provide
the following status indications:
•INPUT OK—When the rotary power switch is turned ON, this green LED goes on
immediately, indicating that source DC power is applied and that it is within the
specified operating range (–40.5 VDC to –75 VDC). If this LED does not go on when
the rotary power switch is turned ON, the source DC power being applied to the power
supply is not within the normal operating range or 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 supplied to the backplane is not within toler ance.
Upper Card Cage and Associated Components
The upper card cage (see Figure1-8) contains ten slots that accommodate the following
types of cards in the quantities indicated:
•One Route Processor (RP)—A RP is a standard and required router component; the RP
must be present and operational at all times. It is recommended that you install the RP
in the left-most slot (slot 0) in the upper card cage.
•Either one or two clock and scheduler cards (CSCs)—One CSC is a standard and
required router component; one CSC must be present and operational in the router at all
times. For redundancy, you can install a second CSC for use as a backup.
Two dedicated slots in the middle of the upper card cage (CSC0 and CSC1) are reserved
for the CSCs. Because the backplane connector of a CSC differs significantly from all
other card types, you cannot install a CSC in any other slot.
•Cisco 12000 series line cards—From one to seven line cards of different types can be
installed in the line card slots in the upper cage (slots 0 through 3 and slots 4 through 7).