The maximum ambient operating temperature for the CSS 11800 is 32? to 104? F (0 to 40? C). When you install the CSS 11800 in a closed or multi-unit rack, the operating ambient temperature of the rack environment may be greater than the room ambient temperature. Ensure that the temperature does not exceed the CSS maximum ambient operating temperature.
"Ensure that the CSS 11800 is reliably grounded to earth. Do not use power strips or extension cords to connect the CSS to the power source
The show diag environment EXEC command shows the temperatue of the Device.