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Currently, as soon as you plug in a single PoE device FAN's start turning at 50% even though the load is only 2w. Maybe this can be configurable, or better tuned based on the temperature of the s...
This has just been resolved in the latest firmware release 1.0.0.30.
Previously the fan would start up as soon as I attached a PoE device, and run at 50% duty cycle. Now, the fan seems to be temperature controlled. After I upgraded my device, the fan stayed off at first, the system temperature rose from ~42°C to ~57°C before the fan kicked in. It now runs at 33% duty cycle and keeps the system at 47°C. Note that this is in an unventilated rack with other hardware; PoE load is about 30W with 10 devices.
Before the update I had to close the room door so that I wouldn't be disturbed by the switch's noise. Now, I can't tell whether the room door is open or not. So the firmware release is definitely an improvement.