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Troubleshooting the Cooling Subsystem
Blower Module Operation
Power Supply Operation
Cisco XR 12410 and Cisco XR 12810 Router Installation Guide
4-38
The blower module maintains acceptable operating temperatures for the internal
components by drawing cooling air through a replaceable air filter into the switch
fabric and alarm card cage, and then through the line card and RP card cage
(see
Figure
4-11). The blower module occupies a bay at the top of the router and
receives power from the chassis backplane through a wiring harness.
The blower module contains three fans, a controller card, and two front panel
status LEDs. A snap-on plastic front cover fits over the front panel, but the LEDs
are visible through the front covers.
–
Green—The blower module is functioning properly.
Red—There is a fault detected in the blower module.
–
If the air temperature inside the chassis rises, blower speed increases to
•
provide additional cooling air to the internal components.
If the internal air temperature continues to rise beyond the specified
•
threshold, the system environmental monitor shuts down all internal power to
prevent equipment damage due to excessive heat.
If the system detects that one or more of the fans in the blower module has
•
failed, it displays a warning message on the system console and displays a
blower failure message on the RP alphanumeric display. In addition, the
remaining fans go to full speed to compensate for the loss of the failed fan.
Each AC or DC power supply is equipped with a fan that draws cooler air in
through the front of the power module and forces warmer out the back of the
power shelf.
If the power source is within the required range, the power supply fan remains
•
on.
•
If the fan fails:
Power supply detects an internal overtemperature condition
–
Fault and Temp indicators light
–
Power supply sends an overtemperature warning to the system and then
–
shuts down the system.
Chapter 4
Troubleshooting the Installation
OL-17441-01
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Troubleshooting
