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Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-06
Chapter 2 Power and Cooling
Facility Cooling Requirements
Heat dissipation and external cooling requirements for the 8-slot line card chassis are as follows:
• Heat dissipation: 27,350 BTUs per hour
• External cooling requirements: 2.3 tons
To ensure that the site provides the proper air circulation for the system:
• Make certain that the site is as dust free as possible. Dusty environments can clog the air filter or
power supply intake vents, reducing the cooling airflow through the system.
• Allow sufficient airflow by maintaining a minimum of 6 inches (15.2 cm) of clearance at both the
inlet and exhaust openings on the chassis and the power modules. If airflow is blocked or restricted,
or if inlet air is too warm, an over-temperature condition can occur. Under extreme conditions, the
environmental monitoring system shuts down the power to protect the routing system components.