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New AN-220-SW-R-24-POE Temp & Noise


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I have been running a new AN-220-SW-R-24-POE for a few weeks now. It is my first POE switch so I am not sure what to expect. The switch is running about 20% of its 190watts for POE and the current temp is registering at 90 degrees F. The fan seems to always be on, which is fine, but last night, the switch started making a slightly whining sound, like almost a quiet whistle. I had moved the switch in the rack one slot down, but otherwise, have not made any changes. The fan to the right side is completely unblocked. I am assuming the current 90 degree temp is fine but should I be considered about the new noise? 


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