I abstracted the log sessions and in doing left out the 'PPP LCP Sending Termination Request' message as this problem has been hanging around the BT Broadband service since 2013.
Many instances of this problem have been resolved by BT fixing (replacing) the line from the (Pole/Exchange/Junction Box) into the house. It appears that broadband transmissions do not work well with the older copper wire used in earlier years.
However, I dont think my problem can be attributed to this cause as I can experience many days of uninterupted connection and then, as now, I experience periods of multiple disconnections (resets) that are provoked by the BT server (see sample of log below). The strange thing is that these requests usually happen overnight when I am not using the service so they do not interupt my use. Their frequency, however, results in the DLM kicking in and downrate my profile to a level much lower than the ADSL connection rate that can be achieved with the usually acceptable SNR value of 6.
My current download rate has now reduced 6464 with and SNR value of 11.3 (which is amazingly high). This rate, as expected, supports my current IP value of 5.5. This value should be considered low as during the past week my ADSL connection rate has regularly ranged from 6500 up to 7250, all with SNR values around 6. At this level my IP value should rise to at least 6 if not 6.5!
I look forward to seeing the moderatorscomments once they have looked into the possible causes of my degraded service.
Hope this extra info clarifies the situation in which I find myself.
I agree entirely with your suggestion that the cause of the resets should established.
As I pointed out when I first raised my problem of 'Stuck Profile' my service had been stable and uninterupted by restarts/resets for over 10 days. This stable period was preceded by many months where my service was occasionally interupted by these spurious requests. These invariably occured overnight so I put them down to 'services maintenance' taking place.
My enquiry was raised because my DSL connection rate has been in the high 6000 band for many months but my IP value appeared to be stuck at 5.5 (my download speed rarely exceeded 5.3.
As you will see from the BTWholesale Speedtest taken below last year I have been receiving a far better service than I currently get although the DSL connection rate is no better than it is at present.
I can confirm that all my internal telephone wiring and the local underground telephone cabling to my house has remained unchanged for more than 12 years since I moved to this property, so I have no reason to suspect that a fault has suddenly appeared, as you seem to suggest.
I should add that these repetative resets that I am now getting have only started to occur after you suggested that I reset my HH earlier this week. Coincidence or what?
Ok, I have now both done a 'Factory Reset' on my HH5 and used the 'Test' socket on my NTE. All to no avail on the way the DLM service manages my line.
Below are the result of a speed test I did before the HH5 reset.
From this you can see that that although my connection rate is 5.31 Mbps my IP profile is now only 4 Mbps, much lower than the 5.5 Mbps that I had been getting for the many months before I raised the issue of 'stuck profile'!
After the reset the follwing connection was achiieved:
You will notice that the sync rate achieved is 6912 which is very close to the max possible of 7.15.
I think this clearly demonstrates that my line is working perfectly and I would therefore expect that over the next 3 days DLM would slowly raise my IP Profile back to at least 5.5 if not 6.0. This, however, is not the case. Last night DLM reset my hub several times and on each occasion the sync rate achieved varied considerably from between 4704 up to 6848 all with noise margins above 9.
I am now left with a low sync rate with little chance of my low very low IP Profile being changed.
I must ask again 'what is going on' as these problems only started to manifest themselves after I raised my first query about my profile being stuck at 5.5 Mbps after I had been getting an uninterupted service over many weeks (i.e. NO resets whatsoever) with a sync rate in the high 6000's.
I repeat that my previous very stable service has suddenly plummeted to abysmal. Unless you can prove to me that my line is at fault as every test I do as recommened by the BT website indicates no problem whatsoever, I see no reason to request an engineer attend as I feel this will be a waste of everyones time.
I look forward to hearing from a moderator very soon otherwise I am prepared to escalate this matter through the formal BT complaint procedures.
I appreciate that it is supposed to optimise connection speed with a reasonable balance between error rate and speed, but surely its possible that it can get its process wrong from time to time. DLM has forced my HH into a resync state more than 6 times in the last 12 hrs. Many of these resyncs have taken place within minutes of each other which implies that the DLM does not know what its doing!
After last nights resyncs if have ended up with a sync rate of 5280 mbps and a noise margin of 16.4 db! If the target noise margin is 6db and my max line speed possible is 7150 mbps then DLM must surely not be working correctly if it settles at this connection rate?
