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CiscoASR 9000 Series Aggregation Services Router Hardware Installation Guide
Chapter1 Preparing for Installation
Site Requirement Guidelines
Figure1-16 Air Flow Path through the Cisco ASR 9912 Router—Side View
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 in (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 powers off the router to
protect the components.
Rear Air
exhaust plenum
Air exhaust
Line cards
RPs and FCs
Fan trays
Power trays
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