Yesterday in their results BT suggested that FTTC could be made to go at 80 Mb/sec from next year and potentially could hit 100 Mb/sec.
In other posts the comment has been made that those speeds would only work for those on very short loops. In another thread WWWombat linked to a BT presentation that stated that the average D side link was 420m and also included an Ericcson document http://www.ericsson.com/us/ericsson/corpinfo/publica... that showed on p43 the expected distance that VDSL can travel. That graph shows that at 400m you should get around 20 Mb/sec. Well my line has D side link of 400m approx and I get 35 Mb/sec against a predicted 22 Mb/sec and whilst I understand the discussion about crosstalk my speeds have been stable on a cabinet that has been available for 12 months and if the number of times an OR van is parked beside it they appear to be selling lots of connections.
So is VDSL more robust in the wild than these documents suggest or are BT blowing wind in their results? Both documents are from 2008 and I wonder if it is working better than they expected. BT have been cautious marketing Infinity so they can claim high average speeds making people with predicted speeds below 15 Mb/sec have another product so it would be unlikely they change that to allow a headline speed for a few like ADSL2 or is it?