I THINK that ADSL24 was one of these ISPs.
My own ISP (Plusnet) chose to only trial users who were previously achieving around the 40Mb mark.
I have not yet seen any feedback from any such (lower speed) experiment.
If any of you fall into the above category, I would be most interested to see any relevant feedback.
My interest is that when FTTC was first installed, I achieved an actual throughput of 33Mb.
As I was unable to see my own connection's stats at that time, I can only assume that my sync speed MUST have been in the region of 35Mb.
Following a number of physical line problems & various engineers' visits, I am currently stuck at a sync speed of just below 30Mb (on a good day), with throughput of just below 28Mb.
My ISP is unable to confirm whether or not BT have capped my sync speeds (for whatever reason), but can confirm I currently have a BT connection profile of only:-
"16.2M-32.4M Downstream, Interleaving Low - 3.6M-7.2M Upstream, Interleaving Off"
I would like to know if entry onto the 80/20 trial triggers a sync speed recalculation/reset/improvement - I suspect not.
FWIW, quite often, my connection re-syncs with an attainable rate of around 35Mb and SNRM at 6dB.
However, it was back in July that it last actually synced higher than 30Mb.
Back then my BT connection profile was:-
"20M-40M Downstream, Interleaving LOW - 0.5M-2M Upstream, Interleaving Off"
If anything, the switch to the 17a profile back in October should have triggered an increase in DS sync speed at the expense of a slight loss of US speed as more tones were made available for DS at the lower frequencies.
Edited by Bald_Eagle1 (Thu 23-Feb-12 15:48:09)