3Com S7906E Command Reference Manual page 2047

Use the temperature-limit command to set the temperature alarm threshold on a board.
Use the undo temperature-limit command to restore the temperature alarm threshold to the default.
By default, the temperature alarm thresholds for a board are as follows:
Upper limit: 80°C (176°F)
Lower limit: 0°C (32°F)
The upper-value argument must be bigger than the lower-level argument.
Examples
# Set the lower temperature limit on board 1 to 10 Celsius degrees and the upper temperature limit to 75
Celsius degrees.
<Sysname> system-view
[Sysname] temperature-limit 1 10 75
Setting temperature limit succeeded.
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