I could be wrong but I don't think you would need more than the one set of phone wires. It says it won't affect phone service so it probably uses a modulated frequency higher than the the telephone service uses, which isn't much. It sounds like it might be using something like (or actually) the home networking standard.


Maybe I didn't explain properly. I only have one phone socket in my house, no extensions no cabling no nothing, just the one that comes in from the telco. All handsets are digital wireless affairs as is networking. The phone cable for the one socket runs under the floor into a cupboard - I was going for a minimalist look!
10BaseT would be great (for me at least) but maybe not Joe Public?