Makes sense - if the user gets less than they expected, then BT will get complaints. It's only an estimate after all, so perhaps they went for something like 2 standard deviations below the mean for any particular distance.
Bulldog ADSL2+ 17mbit/1mbit, 23 attn, 5 margin, 23 power ("extremely noisy line" say BD)
ADSL/ADSL2+ speed chart
Edited by arfster (Fri 13-Apr-12 10:08:11)