I found the trial results I was talking about ...
It could be found as one of the presentations I mention in this thread
. Unfortunately, those documents have been removed, so I only have the versions I downloaded earlier in the year.
One bar chart (slide 7) shows speeds for the three different trial lines, each with results from 3 different amounts of spectrum: 23-88MHz, 23-106MHz and 2-106MHz.
On the 19m line, the results were 490Mb, 580Mb and 720Mb respectively.
The non-use of 21MHz is how they get G.fast to co-exist with VDSL2 17a (while always avoiding the bottom 2MHz for ADSL2+), but the consequence is that it reduces (G.fast) speeds by a hefty amount.
: I found an alternative copy of the BT G.fast trial results: Pages 7 and 8 of
Edited by WWWombat (Thu 27-Nov-14 19:08:51)