Cisco Systems 7500 Series manual Cisco 7507 and Cisco 7507-MX Airflow Considerations, Chassis

Chapter 2 Preparing for Installation

Site Environment, Chassis Temperature, and Airflow Guidelines

Cisco 7507 and Cisco 7507-MX Airflow Considerations

The system blower on the Cisco 7507 and Cisco 7507-MX provides cooling air for the processor modules. The blower draws air in through the air filter in the front chassis panel and directs it up through the floor of the internal slot compartment and over the cards. The exhaust air is forced out the rear of the chassis above and to each side of the processor slots. The blower needs a clean air filter in order to draw in sufficient amounts of cooling air; excessive dust in the filter will restrict the airflow. Keep the air filter clean and replace it when necessary.

Figure 2-8shows the system blower and airflow through the Cisco 7507 and Cisco 7507-MX.

Figure 2-8 Airflow Through the Cisco 7507 and Cisco 7507-MX

Top view of router

System	6
blower	5
	4
	3 (RSP2)
	2 (RSP2)
Front of	1
chassis	0
Air dam	Air dam
Power
supplies
H3882	Rear of
	chassis

Sensors on the RSP2 (for example) monitor the inlet and internal chassis air temperatures. If the air temperature at either of the sensors exceeds a desired threshold, an environmental monitor displays warning messages and can interrupt system operation to protect the system components from possible damage from excessive heat or electrical current.

The power supplies have their own fans. An air dam between the power supply bays and the processor module compartment keeps the airflow constant.

Cisco 7513, Cisco 7513-MX, and Cisco 7576 Airflow Considerations

The blower on the Cisco 7513, Cisco 7513-MX, and Cisco 7576 provides cooling air for the processor modules. The exhaust air is forced out the front of the chassis behind the card cage.

Figure 2-9shows the system blower and airflow through the Cisco 7513, Cisco 7513-MX, and Cisco 7576.

Cisco 7500 Series Installation and Configuration Guide

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