Chapter 1 Product Overview
Blower Module
Caution You should inspect and clean the air filter one time per month (more often in dusty environments). Do not operate the router without an air filter installed.
The blower module controller card monitors and controls operation of three
Two temperature sensors on each line card monitor the internal air temperature in the card cages:
•When the ambient air temperature is within the normal operating range, the fans operate at their lowest speed, which is 55 percent of the maximum speed.
•If the air temperature rises inside the card cages the fan speed increases to provide additional cool air to the cards.
•If the 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 of the three fans within a blower module has failed, it displays a warning message on the console window. In addition, the two remaining fans go to full speed to compensate for the loss of the one fan. If another fan fails, the system shuts down to prevent equipment damage.
For additional troubleshooting information, see the “Blower Module Operation” section on page
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