Thanks, you have confirmed my understanding, I will only connect 2 & 5.
PC to Modem connection is via a LAN cable, Clarity also provided a 3M RJ11 to RJ11 cable to connect the Router to the faceplate.
Did I say Contention? I meant Attenuation, Senior Moment there.
Been involved with Computers since 1964, PCs since 1984, I had better go, I feel a nostalgia attack coming on............