Quick question.... possibly a dumb one but still.
Should attainable rate always be an independent, dynamic indication of line quality? ie. if I have a problem I'll see it drop but if I improve things, it should near-immediately show an improvement? or, as the ISP has suggested, does DLM affect it?
The situation for me is that I've had a stable 80/20 sync for a couple of years, attainable at around 95/30. Graphs to show it etc. Then a couple of weeks ago, I had a resync on a sunday down to 74/20 then 69/20 and finally 59/20 which it's been stuck at for 10 days or so now.
At the time, I wasn't home, nothing new plugged in or done, but when I found it, I started trying different router/different cable etc. which probably didn't please DLM overly. DLM put interleaving on at 10 and INP to 5. Then after a couple of days it reduce Interleaving/INP to 8/3, then finally 0/0.
So now it's been "stable" with int/inp 0/0, hardly any errored seconds, sync rate 59999/20000 and Attainable Rate: 62776 kbits/s/22173 kbits/s
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 8.9 20.2 31.7 0.1 15.6 23.6 N/A
Signal Attenuation(dB): 11.5 20.0 31.7 0.1 15.6 23.6 N/A
Noise Margin(dB): 6.9 6.9 6.9 6.8 6.7 6.6 N/A
So if this was a new connection in its first few weeks, I'd have said well done DLM, figured out a nice stable speed. BUT it's been 80/20 for years so I've lost 20Mbs really quickly and there really has to be a reason for it
ISP has said just leave it, see what DLM does it couldve been a day of noise but DLM will eventually get there (could take weeks to reband higher) etc.
I'm ok with that, but the attainable rate worries me. Having fallen from 95mbs to 62mbs, if that's a near instant reading of "line quality" to some extent, then it implies that something is still bad on the line and I should be looking at the router/cabling/local interference etc trying to improve that figure before DLM will do anything ? my ISP says it doesn't work like that, since DLM has limited the line to 60/20 that will have reduce the attainable rate as well.
That kinda feels wrong to me, I'd have expected attainable to shoot back up to 95 if it was once again a nice clean line but I don't know for sure?
Any ideas?
Thanks!