Matt wrote:

Owain wrote:

Caveat: the numbers on the screw extension socket may be the reverse of
the master socket, if the master socket uses BT numbering.

Since when have they ever been different? The only screw up in the
original BT spec was that cores 1-6 on the cable were incorrectly
numbered in the reverse direction to the terminals in the line jack.

Agreed - the terminal numbering should never be different, unless anyone
is selling non-compliant LJUs.

As you say, confusion arises because the pin numbering of the connectors
runs the opposite way round to the numbering of the wiring terminals
(LJU terminal 1 goes to connector pin 6, and so on). This is widely
believed to be the result of a historical cock-up.

Pin 1 of the connector is the one furthest from the latch release lever,
but unless you are making up your own phone, modem or extension leads
you can forget about the connector pin numbers and just follow the
terminal numbers, which are *always* wired 2-2, 3-3, 5-5.

http://www.wppltd.demon.co.uk/WPP/Wi...telephone.html
has more information and clear diagrams.

--
Andy