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CiscoXR 12406 Router Installation Guide
OL-13831-01
Chapter2 Preparing for Installation
Installation Site Requirements
Environmental Guidelines
This section offers guidelines for operating a Cisco XR 12406 Ro uter in various
environments. The following environmental considerations are discussed:
•Airflow
•Temperature and humidity

Airflow

The air circulation system for a Cisco XR 12406 Router consists of one blower
module mounted at the rear of the chassis. The blower module maintains
acceptable operating temperatures for the internal components by drawing
cooling air in through replaceable air filters located on the right side of the
chassis. Air circulates through the card cage and exhausts at the rear of the
chassis.
Observe the following guidelines when selecting a site in which to install a Cisco
XR 12406 Router:
•Dust free—The site should be as dust free as possible. Dusty environments
can clog the air filter or power supply intake vents, reducing the cooling air
flow through the router. This can cause an over temperature condition in the
router.
•Air flow—Allow sufficient air flow by maintaining a minimum of 6 inches
(15.24 cm) of clearance at both the inlet and exhaust openings on the chassis
and the power modules. If the air flow is blocked or restricted, or if the inlet
air is too warm, an over temperature condition can occur within the router.
Under extreme conditions, the environmental monitoring system shuts down
the power to protect the router components.