Cisco Router XR 12416 Installation Manual page 37

Chapter 1 Product Overview
Each blower module contains three variable speed fans and a controller card. The
two front cover LEDs provide a visual indication of blower module status
(Figure
Figure 1-18
•
•
The blower modules maintain acceptable operating temperatures for the internal
components by drawing cool air through a replaceable air filter into the switch
fabric card cage and then through the upper and lower card cages.
illustrates the air flow path through the chassis.
OL-17440-01
1-18):
Blower Module
LEDs
OK (green)—All three fans are operating normally.
FAIL (red)—The system has detected a fan failure or other fault in the blower
module. The fault can be caused by any of the following:
One or more fans are not operating
–
One or more fans are running below speed
–
A controller card fault
–
Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide
Blower Module
Figure 1-19
1-37