Cisco Systems Cisco 12008 manual Status LEDs for the Fan Trays, Status LEDs State Description

		Removing and Replacing the Fan Trays
Table 7-1	Status LEDs for the Fan Trays
Status LEDs	State	Description
Left LED	On (amber)	Indicates that a fault exists in the card cage fan tray
Right LED	On (amber)	Indicates that a fault exists in the power supply fan tray
Both LEDs	Off	Indicates that both fan trays are operating normally

If a fan in one of the fan trays fails, the following occurs:

•Fan speed on both fan trays increases to the maximum rate, even in the absence of an over-temperature condition in the router.

•The appropriate status LED on the CSC faceplate goes on (see Figure 7-14), indicating which fan tray has failed.

You can check the status of the fan tray LEDs by issuing the show environment leds command at the privileged EXEC mode prompt. You can check the status of the fan trays themselves by issuing the show environment all command at the privileged EXEC mode prompt.

Maintaining the Cisco 12008 7-49