Cooling System; Cooling System Overview - Cisco CRS-1 System Description

Cooling System

This chapter describes the components that make up the cooling system of the Cisco CRS 8-Slot Line Card
Chassis Enhanced router.
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Cooling System
This chapter describes the components that make up the cooling system of the Cisco CRS 8-Slot Line Card
Chassis Enhanced router. It contains the following topics:
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Cooling System Overview

The Cisco CRS 8-Slot Line Card Chassis Enhanced router cooling system dissipates the heat generated by
the routing system and controls the temperature of components in the chassis. The cooling system has a fully
redundant architecture that allows the routing system to continue operating with a single-fault failure (such
as a single fan or fan tray failure). See
architecture also supports a redundant load-sharing design.
The complete chassis cooling system includes:
• Two fan trays. Each fan tray contains four fans.
• Temperature sensors (on cards and modules throughout the chassis).
• Control software and logic.
• An air filter, inlet and outlet air vents, and bezels.
• Blanks and impedance carriers for empty chassis slots.
• Modular configuration AC and DC PMs have their own fans.
All four fans in a fan tray operate as a group. So if it is necessary to increase or decrease airflow, all fans in
the tray increase or decrease their rotation speed together. When two fan trays are operational in a chassis,
the speed of fans in both trays is adjusted together.
Thermal sensors (inlet, exhaust, and hot-spot) located throughout the Cisco CRS 8-slot Line Card Chassis
Enhanced router are used to monitor temperature readings and identify when the system is not cooling properly.
Cooling System, on page 33
Cisco CRS 8-Slot Line Card Chassis Enhanced Router Fan Tray, on page 36
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
C H A P T E R
Cooling System Redundancy, on page 36
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for more information. The
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