If your MCU module is installed in the top slot of the Cisco Unified Videoconferencing 3545 chassis, then the module also performs PCI bus functions for the chassis. In the MCU interface, you can use the System section to monitor chassis functions remotely.

One of the functions the chassis performs is to monitor ambient temperature. You can set temperature thresholds in the System section. The chassis uses these thresholds to trigger a warning that the ambient temperature exceeds specification and when the temperature has returned to five degrees below the warning threshold.

http://www.cisco.com/en/US/docs/video/cuvc/5_5/mcu/3545/configuration/guide/intro_gui_5_5.html#wp1112850