Chapter 3 Installing And Removing Air Circulation Components; About Line Card Chassis Airflow - Cisco Carrier Routing System CRS-1 Installation Manual

Installing and Removing Air Circulation
Components
This chapter provides instructions on how to install and replace the Cisco CRS Carrier Routing System
4-Slot Line Card Chassis air circulation components.
This chapter presents the following topics:
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•

About Line Card Chassis Airflow

The Cisco CRS 4-slot line card chassis has a single fan tray containing four fans that cool the chassis
card cage. Cool air flows in at the bottom front of the chassis and flows through the chassis card cage
and through the fans in the fan tray before being exhausted through the top rear of the chassis (see
Figure
In addition, each power module at the bottom of the chassis has self-contained fans that pull in cool air
from the front of the chassis and exhaust warm air out the rear. There is parallel path for airflow through
the fabric cards.
OL-10971-10
About Line Card Chassis Airflow, page 3-1
How to Install or Remove Air Circulation Components, page 3-3
3-1).
Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Installation Guide
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