Excuse me for butting in on this thread butt ... I have noise on my line too, I've had 2 Openreach engineers check it out o'er the years and the last one a couple of months ago cured the problem - at the exchange.
It's started again
really noisy this time and of course it's knocked my download speed down to a pathetic 1.41Mbps whereas it's normally about 3-4Mb.
The thing is, the crackling noise doesn't begin straight away, but say, today it started after being on the dog 'n bone for 3 minutes, and it usualy starts with a 'click' sound.
I live out in the sticks with overhead copper/aluminium cable, and I'm 2 miles from the exchange and 1 mile from the cabinet sauvignon, I was just a'wondering if there's any engineer out there that has any ideas on this PITA problem.
I've plugged into the master socket AND tried different filters etc.