Allied Telesis AT-S99 - Manual (Page 116)

Chapter 4: Configuring the AT-CV5M02 Management Card
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4. In the Temperature Threshold pop-up window, click the Maximum
Temperature Threshold field and enter a new value. The range is 0
to 75° C. The default is 60° C.
5. Click Update.
6. To save your changes in the master configuration file, select the Files
tab in the Configuration window, click Save System Configuration
and All Cards Configurations and click Apply.