Hi,
As a result of phone noise problems occurring after I installed ADSL, I checked out every extension/connection in my house very carefully. Nothing untoward found, correct cables used etc.
However, I did find that there was -52.5V (to earth) on terminal 5 of my (old style) BT NTE5 Socket and -4.2V (to earth) on terminal 2 - i.e. on the opposite terminals to that shown on publically available wiring diagrams. The BT installed wire colours appear to be correct however - i.e. orange to 2 and white to 5.
This suggests that somewhere along the line between my house and the exchenge the wires have been crossed. Did BT get it wrong at the exchange or at the pole (and could this contribute to my noise problems) or doesn't it matter which line has the -50V?
Thanks in advance.