Cisco Systems CRS-1 manual Chassis Airflow, Facility Cooling Requirements, 2-10

Models: CRS-1

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Chassis Airflow

Chapter 2 Power and Cooling

Chassis Airflow

Chassis Airflow

The Cisco CRS-1 8-slot line card chassis has two fan trays, with three fans each, that cool the chassis card cages. Cool air flows in at the bottom front of the chassis and flows through the chassis card cages and through the fans in the fan trays before being exhausted through the bottom rear of the chassis (see Figure 2-9).

In addition, each AC or DC 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.

A replaceable air filter is located on the front of the chassis below the PLIM card cage. Each power module also has a replaceable air filter that attaches to the module at the front side of the chassis. How often you should replace the air filters depends on the facility environment.

In a dirty environment or when you start getting frequent temperature alarms, you should always check the intake grills for debris, and then check the air filters to see if they need to be replaced.

Note We recommend that you check the air filters once a month. Replace a filter when you notice a significant amount of dust.

Figure 2-9 Airflow Through the 8-Slot Line Card Chassis

Front

Rear

Fan

Air filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan

 

 

 

 

 

 

 

 

 

 

 

Air enters

 

 

 

 

 

 

 

 

Air exits MSC and

 

 

 

 

 

 

 

PLIM side

 

 

Power system

 

fabric card side

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The 8-slot line card chassis airflow volumes are as follows:

Chassis airflow: Up to 900 cubic feet (25,485 liters) per minute

122784

Power system airflow: Up to 240 cubic feet (6800 liters) per minute

Facility Cooling Requirements

The 8-slot line card chassis dissipates considerable power that generates much heat. In large configurations, additional air cooling is required to maintain correct operating temperatures. The room air must be cooled by external cooling units that are installed as part of the routing system.

Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide

2-10

OL-5802-06

 

 

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Cisco Systems CRS-1 manual Chassis Airflow, Facility Cooling Requirements, 2-10