Cisco XR 12410 Installation Manual page 43

Chapter 1 Cisco XR 12410 Router Overview
Two temperature sensors on each line card monitor the internal air temperature in
the card cages:
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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.
Horizontal Cable Management Bracket
Cisco XR 12410 Router Installation Guide
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