A:Answer Voice of Experience: I too use a legacy system, which I had connected via ethernet cable to a Linksys gaming adapter. This made a wireless connection to the router, and worked well for several years, but has been failing by inches for some time, and recently failed completely. Connecting computer and router via ethernet cables to these power-line adapters solved my networking problem better than completely, as the system now not only connects to the router but runs faster than before. So I would guess that the cable connection you describe would work. There is, of course, the scientific way to answer your question--try it and find out!