At present, the master socket is near the front door. There is approximately 25 meters of standard cable ( cheapo extension kit ) running to the back of the house where the computer and wireless n modem is plugged in, and another house phone. Speed wasn't a major issue before, but after my 1yr old vandalised the molded end of the cheapo extension cable, I decided I might as well put in a better ( and more child safe ) option. The master socket is on a wall behind the main opening front door, meaning it is not appropriate to plug a modem there, from the same socket ( via a doubling part of the extension kit ) a lead runs to the other side of the hallway to support a hall phone.
My plan is to have a cable direct into the user port of the master socket, running up to the ceiling, and into a junction box, with one direction going approximately 2 mtrs to where the current phone is, and install the modem there, connecting wirelessly to my PC at the back of the house and hopefully a better signal due to much less cable, and the other direction going to the phone at the rear of the house. but still leaving me an option if the wireless signal is poor in my house, to plug the modem back in at the back of the house.
As far as the cable is concerned, I guess I could just pick a wire to choose, ( whether I decide to use 2 or 4 of them ) but really wanted to know if the 2 wires I choose for 2+5 should be one of the twisted pairs, or 1 each from 2 pairs, or if it makes any difference. Also, what to do with the unsused wires, should they just be cut off ?