You should not be switching A & B yourself.

If this persists you really need to report a fault to your service provider. This is not normal.

Important to note is if you confess to tampering with BT equipment like you have been you will be liable for the repair charges.

Zarjaz is very experienced, so have some respect

Please mark this post as Closed.

Simple answer is report it to your service provider and they can get openreach to investigate,

No need to be rude on here,
that is why no one is replying.

your best friend in this matter will be google.

Period.

No I am only reversing the wires at the extension socket, it's a very old installation with the BT wires arriving at a lozenge shaped junction box. BT just said that the fault lies with my equipment (when the noise was on the telephone), and anyway there is no fault showing now. Not found anything on Google nor read about anyone else with this. Strange.

Try the Quiet Line Test, dial 17070 and take option 2 and listen, if there is noise then report it as a phone line/voice fault (not broadband and don't mention it either) to your phone service provider.

Do you have a master socket? If you do not or even if you do, is there noise on the line?

Edited by ukhardy07 (Fri 06-May-16 20:04:35)

There must be a master socket. There are plenty pre-NTE5. Mostly LJ 2/1As.

The master socket...to explain. When I moved in here 33 years ago the overhead line in to the house was to a junction box then promptly popped outside again, over a roof, through an upstairs window to another junction box affair then to a socket. A separate line ran from first junction box to a down stairs socket. Do the lines were in parallel.

At some point we had BT in and they made the upstairs socket the master and ran a line back to the junction box downstairs and then to the downstairs socket.

At a later date another BT engineer removed the line to upstairs, made the downstairs socket the first point and I ran an Ethernet cable to the upstairs socket on his suggestion.

At various stages I have had third party active sockets upstairs and downstairs. Currently only upstairs feeding the modem.

That's why I am quite relaxed about the master socket business. Technically and legally it must be the downstairs one now I supose but I seem to get on well with visiting engineers and have never had a problem or rebuke.

Glad you asked?

My link has a gallery of sockets.

I am quite relaxed about the master socket business.

That might explain why you have a problem.

Thanks. Can you point me at the link? The input into the downstairs socket is unchanged from when BT put it in, all I did was to take A and B off round the house from a connector post in the socket. There is a piano in the way so not easy to get to but only has a single socket to the outside world. There is no ring wire anywhere.

Only relaxed in the legal sense......

In reply to a post by MrOptimistic:

Thanks. Can you point me at the link?

In this thread, at Sat 07-May-16 11:00:58

The point I was indirectly making there was that knowing the location of the master is a vital factor in vetting and altering your wiring. How it connects to the incoming line from outside, and what else connects where, can hugely affect what goes on in terms of interference pickup on your connection.

Changes you make without knowing which is the master are basically random and "suck it and see". Best is to draw a diagram of all wiring once you know which is the master, upload it somewhere, and let us take a look. Descriptions are very often open to misinterpretation, however hard any of us try either describing our own to other people or reading theirs.