Increase in attainable rates and sync speed

Question

I've noticed that my line is now syncing at 79999 down and 20000up, lasst week, and for the past 6 months the attainable rate has been 60000 down and 15000 up,
I'm still only getting 71000 down via the bt speedtest and 9000up, getting slightly better results on bbc though.
Also noticed my latency to the bbc is down from 25ms to 21ms
have there been any changes to the network or is this the DLM deciding that my line is good enough to handle higher speeds?

Answer 1

I don't think your line will improve even more, as you are at the limit of your package. 
If you look at your modem stats you will see both sync rate and max attainable rate.  The max attainable rate will only change significantly if something changes in your line.  The sync rate will change as DLM thinks fit.  If you see your max attainable rate is over around 90000, then maybe you could get more stable sync rate if BT offered a higher level Infinity package.
DLM will always keep your sync rate below the max attainable for stability.  For reference, my values are a good but not perfect:
Max: Upstream rate = 23773 Kbps, Downstream rate = 81184 Kbps
Path: 0, Upstream rate = 20000 Kbps, Downstream rate = 73999 Kbps
Down Up SNR (dB): 7.9 14.5
Over the month or so I have been monitoring, my max attainable has dropped slightly, from just over 85000 to values around 82000.  My sync speeds have gone up a lot to reach their current appropriate value, because I had had a previous wiring issue that had lowered my DLM.