Chassis Cooling System - Cisco CRS-1 System Description

Carrier routing system 4-slot line card chassis

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Chassis Cooling System

This chapter describes the components that make up the cooling system of the line card chassis. The

following sections are included:

•

Cooling System Overview

The cooling system dissipates the heat generated by the line card chassis and controls the temperature

of chassis components. The cooling system has a redundant architecture that allows the chassis to

continue operating with a single fan failure. See the

for more information.

The complete chassis cooling system includes:

•

The power modules in the power shelf also have their own self-contained cooling fans and air filter.

All four fans in the fan tray operate as a group. So, if it is necessary to increase or decrease airflow, all

of the fans in the tray increase or decrease their rotation speed together.

Thermal sensors (inlet, exhaust, and hot-spot) are located on the system boards throughout the chassis

and are used to monitor temperature readings and identify when the system is not cooling properly.

Software running on several types of service processor (SP) modules is used to control the operation of

the fans. These SP modules are connected by internal Ethernet to the system controller on the route

processor (RP).

OL-10805-10

Fan Tray, page 3-5

One fan tray (holds four fans and fan controller)

Temperature sensors (on cards and modules throughout the chassis)

Control software and logic

An air filter and air inlet vent

Impedance carriers for empty chassis slots

Cisco CRS Carrier Routing System 4-Slot Line Card Chassis System Description

C H A P T E R

"Cooling System Redundancy" section on page 3-4

3-1

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