Those pairs do not sound correct. Are they all in one incoming cable or separate?

Or & Wh
Gn & Bk
R & Gy
Bl & Bn

are typical pairing in CW1417 with just the first two pairs used in CW1411

yes all wires come in from the one cable

If possible can you actually draw out a diagram of the telephone network cabling - starting with the external dropwire(s) and where they are terminated, then the colours and pairs of wires where you can see them - show which wires are in which cable.

It really does sound as though, somewhere there is massive crosstalk, a split pair, short circuit, or a load split across circuits. It might be inside your network, in the BT network in your house, or external.


You may have to bit the bullet and get BT in to strip everything out and reconnect from dropwire to sockets. If that fails it would start to suggest the problem is external to your property.

Can you get a real close up of the cable - any writing on the side? Would be nice to see the real colours as it leave the outer sheath.

Can you try flexing one of the white conductors ... does it bend and stay there or does it spring back?

Yes i will do that later when i have more time if it will help.

Just to let you know none of my internal wiring is connected while i am doing these tests so that can be ruled out.

The only things connected are the 3 routers each into a filter and into the master test socket.

Se my other comment about another photograph.

am adding another 2 pictures now.

when bending the wires they do not flex back

What I really would like is the incoming BLACK cable - picture 13 shows it but not in enough detail.

Is there anything printed on it?

yes all wires come in from the one cable

How ? The black one only seems to feed two sockets from your photos

In reply to a post by kevc:

TT blue/white
IDnet green/white
BT blue/orange

but these are the connections into the boxes yes ? ie the BT box is on a bit of internal wiring from the TT box, connected with crimps.

What are the colours leaving the black cable that are used, and how is the IDNet box connected to the black cable.