For years I had issues with my ADSL connection in that the line went down 99 times out of 100 when the phone rang, I had around 20 engineers come round to try and fix the issue and they never did, lowering the upstream to 448 made it a lot better but it still did it most of the time (prob 8 out of every 10).
At the end of last year thanks to BDUK funding my cabinet was upgraded to fibre and when I first connected I was able to get 53meg download and 15 or so upload.
For the first week I was able to get 53meg it then went down to 46meg and stayed around that for another 3 weeks and then took a bit of a nose dive to 34meg (engineers were called out but found no issues and even though I could prove I had 50+meg to begin with recorded sync and speed tests from ISP the engineer said that they must of been incorrect as there was no way I could expect to get anymore than 30meg but it shouldn't fall below 30).
Anyway a few weeks later It then fell under 30 and I then decided to get myself a HG612 modem so I could unlock it and look at the speeds, since doing that my line went from having interleave to removing it and in turn ended up giving me some speed back (been around 32meg down / 8 up for a few months.
I realise crosstalk effects the line and as I was the first to be connected to the fibre cabinet I could expect a lot but even then I've not seen people report a drop of around 40% in speeds like I've had (especially in under 2months), anyway since my line went down for the first time in ages today I decided to look at some of the other graphs (I was only really using it to track speed and noise margin before).
Below is a pick of the overall line stats for my line and wondered if anything stuck out??.
What I will say is when I look at the graphs over the time I've been getting the data I noticed that the following happened a lot.
If you look at the above pic (the 2 pics are an hour apart) the bits per carrier falls a lot in the 2nd pic from the first, and then the next hour it would go back to normal and then 6 or so hours later it would drop off big time again and wondered if this was normal?, and if anyone knew the reason it could be happening???.
I noticed later on that month that I wasn't on the latest firmware for the modem so updated it
from that pic it seems to have decided that the tones it was sharing for download/upload have now changed to download only but it no longer seems to be dropping off big time like it did before (or at least not in the hours it's taken it).
In that last pic it's noticeable very near the beginning in the lowest tones that the bits per carrier drops off a lot (from 12 to 4) and then shoots back upto 12 and then gradually falls away.
I had a look around to see if that was normal and someone else had something similar and people seemed to think that it was a "bridge tap" involved somewhere and wondered if this was the case with mine??? and if it is could that have been what was causing the issue when I was on ADSL and the line kept going down when the phone rang?.
Any info on any of the above would be appreciated.