Great performance, but for use in living rooms unsuitable

I have chosen this switch to set up my home network. The performance I am completely convinced. Cabling, switch and (because if not .......) forget. Unfortunately, I realized that the switch is in operation as soon as I plugged in the network cable has begun to unbearable buzzing. The more cables were connected, the worse and louder was the buzzing. Finally, I returned to the switch again.
Who uses the switch in a cabinet and to the sounds which he makes his will not interfere with the safe performance satisfactory. For me, however, I have to rely on a silent machine, since the switch to perform its operation in a living room.
All in all, there are in my view three star.