These RJ11 to RJ45 cables are used to adapt the old telephone jacks RJ11 Ethernet RJ45 to new networks. Even on a recent Philips device, only supplied cable is a RJ11 / RJ11. If the cables are connected and working well, being able to choose different lengths is appreciable. This avoids ending up with players who take son dust. The purchased 3 lengths are ok: 30, 50 or 100 cm.