The UPS also provides power buffering in the case of mains to generated power transfer. Site Environment Table 2-1 lists the operating and nonoperating environmental site requirements. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach a maximum operating range. The Cisco 6920 is cooled by passive conduction from the bottom through the top of the chassis. Keep the top and bottom of the chassis clear of obstructions and away from the exhaust of other equipment.
Equipment placed too close together or inadequately ventilated can cause systems to overheat.
In addition, chassis panels made inaccessible by poor equipment placement can make system maintenance difficult. Following are precautions that can help avoid problems during installation and ongoing operation. Follow ESD prevention procedures to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure. Cisco recommends that blank filler plates be installed on all unused slots of the chassis to protect against dust and damage, as well as to allow for the proper flow of conducted ventilating air important to the cooling of the Cisco 6920.