At first I verwedete deise Adapte for my server. (Which have also been many other written) When I parted from the server and wanted to use the adapter in the apartment I noticed this hochfrquente beep. Have contacted Amazon support and immediately anstandlos get a new one. This power now no more problems.
1 star deduction for the incident that I had to change 1 star deduction for that he did not bring the desired performance. that was I do not come to the 500 Mbit clear to me but it surprised me a bit at the end only good 100.