Hi All,
Well, after almost 6 months I'm pleased to confirm that the fault(s) have now been fixed and I have had a stable 6dB SNR with 20Mb sync for about the last 2 weeks - no drops ! TT have now closed the fault.
For future reference this was a Line fault, not equipment as I suspected. It was actually 3 line faults (all seemed to be HR type). When one fault was cured it exposed another further down the line towards the exchange, but all within 40m of the NTE.
I believe the major event was the fourth (or fifth - can't remember now) BT visit where a new pair was pushed through, all the way from the exchange to the DP. This new copper exposed the closest fault (15m from the NTE) permanently and left me with no service for 5 days. Engineer advised the new copper allowed a higher line voltage which exposed the fault pemanently. When BT returned, they ran a new lead in from the BT16 which made the old lead in completely redundant, thus removing the 15m fault. However, this exposed another fault 40m away in the DP - a simple cut back & re-termination cured this and dropless connectivity was restored.
I'd like to thank all of you for your insight into ADSL and the assistance you all gave trying to figure out what the issue was. Routerstats really allowed the fault to be observed and was a major tool in getting a representation of the issue across to BT each visit. TT never actually requested any copies of the captures, but I did make them aware I had plenty to give if it would help them interogate and provide a diagnosis.
Anyway, surfing is now problem free and second nature - done all my online Xmas shopping .......just in time as the post is now starting to slow up dramtically, so the fault was cured just in time to save any more stress.
Wish you all the very best for 2012, have a great Xmas - thanks again for your continued support with this issue - great site, very friendy, learn't SO much about broadband here.........so I'm now off to make a small Paypal donation.
Best Regards
Will