adsl estimates were totally different especially for customers who were very close to the exchnage adsl2+ could provide up to 24mb connection but very few could achieve thate and the package was initially sold with 20mb conenction speed but subsequently needed to be changed to show likely download speed hence 18mb
infinity is maxed at 80mb even if your line is capable of faster which your line is hence why noise margin higher than 'normal' 6db
you have as fast as you are going to get at present
well actually the difference is nearer to 6Mbps given i am getting around 74 Mbps and it wasn't that long ago i was suffering the 7Mbps of ADSL, that is a pottentially significant difference when you consider multiple devices on a network.
regarding VDSL2, my point was that "whats available" has a potential for much higher speeds than 74Mbps, so for someone to suggest that 74Mbps is the fastest available isnt technically accurate and its a bit disingenuous to suggest otherwise.
Anyway, the point of my original post was to try and determine whether there was an issue on my line, perhaps indicated by the noise margin, that had occured during or as a result of the switch between standards and the answer to that question is yes. However it is not a fault per se, but a purposeful act in order to limit or cap (call it what you will) my connection speed that wasn't in place (or at leats not to the same degree) on my ADSL2 service.