Overview of the Cisco 12008
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
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In a system equipped with two CSCs, pressing the ACO/LT button on one CSC is
equivalent to pressing this button on either CSC or both CSCs.
—System alarm LEDs—Three system LEDs, labeled critical, major, and minor, are
incorporated into the CSC faceplate (see Figure1-14) to signal the existence of
alarm conditions detected in the router by the system’s environmental monitoring
circuitry.
During an alarm condition, one of these LEDs goes on to indicate the severity of the
detected fault. During a critical alarm, the top LED (Critical) on the CSC faceplate
indicates red; similarly, during a major alarm, the middle LED (Major) on the CSC
faceplate also indicates red, signifying an alarm condition of lesser severity; finally,
during a minor system alarm, the bottom LED (Minor) indicates amber, signifying
an alarm condition of least severity.
At the same time that one of these LEDs goes on to signal the alarm event, an
associated alarm relay on the CSC is closed, sending a corresponding signal to the
DB-25 alarm contact connector on the CSC faceplate.
An alarm condition detected in a redundant CSC configuration causes the
appropriate relays on both CSCs to close, activating the visible and audible alarm
functions of the DB-25 connector on each card.
When the fault condition is resolved, MBus software running in the GRP
automatically clears the fault indication by communicating with the master MBus
module, which, in turn, communicates with the MBus module on each circuit
board.
—CSC Status LEDs—Two LEDs on the CSC faceplate, the top one labeled FAIL and
the bottom one labeled ENABLED, indicate the operational status of the CSC.
—FAN FAIL Status LEDs for each fan tray—Two side-by-side LEDs on the CSC
faceplate indicate the operational status of the fan trays.
The LINECARD LED on the left pertains to the card cage fan tray, and the PWR
SPLY LED on the right pertains to the power supply fan tray.
—SFC Status LEDs—Two LEDs at the bottom of the CSC faceplate, the top one
labeled FAIL and the bottom one labeled ENABLED, indicate the operational
status of the SFCs in the lower card cage (behind the air filter assembly).