Cisco Systems Cisco 12008 manual Overview of the Cisco

Overview of the Cisco 12008

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 Figure 1-14) 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).

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