Fan Trays - Cisco 7246 - uBR Router Hardware Installation Manual

Chapter 1 Cisco uBR7200 Series Overview
Hardware Component Descriptions
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.
To remove the fan tray from the chassis, loosen the captive installation screw on the front of the fan tray
and slide the tray out, using the attached handle.
Detailed instructions for removing and replacing the fan tray are contained in the document
Cisco uBR7200 Series Universal Broadband Router Fan Tray Replacement Instructions at the following
URL:
http://www.cisco.com/en/US/docs/cable/cmts/ubr7200/installation/4939sbc.html
Figure 1-11 Cisco uBR7246VXR and Cisco uBR7246 Fan Tray
The fan tray draws cooling air in through the intake vent on the right side of the chassis (when viewing
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. Figure 1-12 shows the airflow through the router.
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 inches of clearance. (See the "Site
Requirements" section on page 2-5.)
Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
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