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Originally Posted by Ignitionnet

You are pretty fortunate to have lived in areas with low FTTC takeup and been <100m from the DSLAM.

Actually both FTTC areas where I've lived have had pretty high takeup, and my line length was 140m in the first case and 80m in the second. The first area had massively oversubcribed VM services, and the second has no VM at all. While admittedly attainable rates at the first were just over 110Mb without crosstalk and 140Mb at the latter, both have lost about 25Mb due to crosstalk but given the point of vectoring is to restore near-crosstalk-free performance, both would presumably achieve 110-120 with vectoring.

Nonetheless, every property I looked at potentially moving to within the city was at most 200m from a cabinet, though that's not to say the line length won't be higher, but I recall reading somewhere that most urban D-sides were <300m.

100% of FTTC subscribers on 38Mb services do not receive 38Mb, 73% do not receive 76Mb, what is this 'highest range'?

The "highest range" I speak of is the highest bin Ofcom published results for that had any customers in it at all, presumably because it is the limit of the technology or the service.

http://blog.thinkbroadband.com/2013/...band-services/

The average customer has a d-side length of either 450m or 550m, depending whether running on mean or median with median the most representative for obvious reasons, it's what 50% of the customer base are at, or further. At that range 76Mb isn't going to happen unless the line is perfect with zero cross-talk and perhaps even extra-thick copper. At ~400m, as the only connection on the cabinet, with a brand new e-side that had been completely rebuilt by an Openreach boost team 3 months before to try and fix a fault my maximum sync was 98.02Mb. Very few people will have d-sides that good.

But we're talking potential speeds with vectoring if it were to be deployed, which most vendors state are in the range of 90-95% of zero-crosstalk speeds.

http://www.increasebroadbandspeed.co...ainst-distance

Notwithstanding any potential change to profile 30a in future, most urban customers would be seeing their speed limited by the service cap, not the line, if vectoring becomes available.

http://www.thinkbroadband.com/guide/...broadband.html

Gives a distribution of line lengths - 30% are 300m or shorter, 45% are 400m or shorter, 60% are 500m or shorter. 450m as a national median is about right. But then again rural areas with current speeds of <2Mb aren't going to be the ones shouting for a 120Mb service, they'd be happy if they could get 20. It's the high-end customers already accustomed to 80Mbps FTTC or VM FTTN that will be wanting it.