hi, I am an ex telephone engineer and looked at that web site with the info on, although correct it may be of help if I explain the simple way. a telephone works on only two wires coming in, the colour does not matter. sometimes there may be other wires connected but these do not do anything. the two centre terminals on a socket of the 6 terminals i.e. number 2 and 5 are the ones that carry the power. the only other one that does anything is terminal 3 which carries the bell ringing current. the simple way around transmission problems is to not use an extension type socket for additional phones, computers etc as the third wire( terminal 3, the bell ringer) can cause all sorts of problems if you get any wires reversed.. so connect the extension wire to terminals2 and 5 on the master socket, then do the same on all other sockets, but if you plug more than 3 or 4 phones in then the ringing will go quiet as the power is not strong enough to energise them all) but make sure they are all master type sockets, the ones with the capacitors in. computer connections should be made where possible to the master socket, but this is not a fixed rule, if the computer works o.k. then don't worry, the loss of a few millieconds is not going to cause any problem. If your original master socket is the two piece type then, as you will have found out, the bottom piece comes out and you connect the extension wiring to that. if it is the one piece type, which are obsolete, then you are not supposed to touch them. the idea is that if you get a fault, b.t. will ask you to pull out the bottom extension piece and test the line to there, to prove if the fault is on your internal wiring or their external network. If they come out and the fault is inside and it is something you have done then they will charge you a load of money for a call out, and disconnect the faulty wiring and go away, unless you want to pay an extra �130 for a rewire. if you have any problem, let me know.
alf.