Cisco 1004-CH - 1004 Enet/ISDN/Bri Rter Specifications Page 30

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Cisco LightStream 1010
Cisco Site Preparation Guide
3-30
Each power supply can be connected to a separate AC source so that, in case of an input power line
or power supply failure, the second power supply maintains uninterrupted system power.
Ventilation Requirements
The field-replaceable system fan assembly provides cooling air for the ASP, interface modules, and
backplane. The fan assembly is located inside the chassis.
An internal fan in each power supply draws cooling air from the front of the chassis through the
power supply and out the rear of the chassis. An air dam keeps the power-supply airflow separate
from that of the rest of the chassis, which is cooled by the fan assembly.
When you are facing the front of the chassis, the fan assembly draws cool air from the right side of
the chassis to cool the modules. The exhaust air is forced out the left side of the chassis.
Sensors on the ASP monitor the internal chassis air temperatures. If the air temperature at the sensor
exceeds a desired threshold, the environmental monitor displays warning messages.
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