I was not able to establish a stable wireless link between a Livebox Inventel and a desktop computer in a different room in the same apartment (perhaps because of a reinforced concrete wall) despite several attempts (wifi USB adapter , "wifi accelerator", ...); it was frequently "refresh" link. It was maddening. The Livebox, the desktop computer and a laptop computer are now connected by CPL with 3 adapters Netgear XAVT2501: Internet access is fast and stable, protected by password, and I disabled wifi Livebox. My only regret is not having chosen this solution sooner! Very satisfied with this product and its delivery.
