Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 329

Table 7-1 Status LEDs for the Fan Trays
Status LEDs State
Left LED On (amber)
Right LED On (amber)
Both LEDs Off
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.
Removing and Replacing the Fan Trays
Description
Indicates that a fault exists in the card cage fan tray
Indicates that a fault exists in the power supply fan tray
Indicates that both fan trays are operating normally
Maintaining the Cisco 12008 7-49