Purchase performed to compare the throughput and stability of datas and from the HD box, because I had some doubts about the free-plugs. The result is superb: the rate has tripled and remains stable in both directions (with free-plugs I had images freezes when I read videos from my PC)
Anyway in my free-plugs do not work properly, replace the ethernet cable was healthy!
No problem with the considerable length of the cable. Delivered quickly and at a friendly price, thank you Amazon!