Cisco XR 12416 - Manual (Page 14)

Chapter 2 Preparing for Installation
Site Requirement Guidelines
2-14
Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide
OL-17440-01
Air Flow Guidelines
Cool air is circulated through the router chassis by two blower modules. The
blower modules maintain acceptable operating temperatures for the internal
components by drawing in cool air through the air filter in front of the switch
fabric card cage (middle), and circulating the air through both card cages
(
Figure 2-5 ).
Each power supply is also equipped with a fan that draws cooler air into the front
of the power supply and forces warmer air out of the back of the chassis.
When selecting a site to install the router, observe the following guidelines:
• Dust free area—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. Clogged filters and vents can cause an
overtemperature condition in the router.
• Unrestricted 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 overtemperature condition can occur within the
router. Under extreme conditions, the environmental monitoring system will
power off the router to protect the components.