Cisco 7206 - VXR Router Installation Manual page 61

Chapter 2 Preparing for Installation
Site Requirements
When you plan the location and layout of your equipment rack or wiring closet, you need to consider
how air flows through your router. The Cisco 7206 draws cooling air in through the intake vent on the
right side of the chassis (when you view the router from the front), and moves the air across the internal
components and out the exhaust vent on the left side of the chassis.
Temperature sensors on the network processing engine and I/O controller monitor the internal air
temperature and send warning messages when the internal air temperature approaches a specified
threshold. If the internal temperature exceeds the specified threshold, the system environmental monitor
shuts down all internal power to prevent equipment damage from excessive heat. (See Chapter 1,
"Product Overview," the "Environmental Monitoring and Reporting Functions" section on page 1-31 for
temperature threshold information.)
Figure 2-2 shows the airflow through the router.
Figure 2-2 Internal Airflow—Top View
Power supply end
Exhaust Inlet
air airflow
Port adapter end
The left and right sides of the chassis must remain unobstructed to ensure adequate airflow and prevent
overheating inside the chassis; we recommend at least 3 in. (7.62 cm) of clearance.
Cisco 7206 Installation and Configuration Guide
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OL-5102-02