i have a problem with my phone extension no dial tone and lots of noise. I've checked the phone through the master socket and its fine, so the problem must be with the extension wiring. I started to check the wiring from the master socket, the first thing I noticed was that on pin 2 there was one white and blue wire and on pin 5 it was the same I assume that this should not be the case and would swop the polarity on one of the extensions, Is this the case and would it contribute to the problem? It had been wired this way by the BT engineer who installed the master socket who I presume would know what he was doing. Anyone got any suggestions before I start swapping wires around?
Now discovered that it seems to be either a faulty microfilter or the home hub causing the problem. Phone is fine until I plug the home hub back in then the dial tone disappears and there is nothing but noise, unplug the hub and dial tone comes back. going to try a microfilter that I know is ok and see what happens
if the noise is still there try using 2 filters connected to each other and the hub connected to the first filter and the phone in the second filter
Tried as you suggested, the noise goes away, dial tone is there but if I try dialling I get the please replace the handset and try again message
The normal extension wiring convention is blue with white bands connected to pin 2 and white with blue bands connected to pin 5. So both wires are blue and white but they are not the same. You do not normally need to connect any other pins and for broadband it can actually be harmful to do so.
The way the wiring was connected at the master socket was pin2 one blue with white band and one white with blue band and the same on pin 5 which I assume would cross the polarities of the phone line the orange wire is connected at pin 3 although not not needed. This was the way it was wired by the the bt engineer who installed the master socket a few months ago-not inspiring confidence in bt engineers! the fault has only shown up recently though