My telephone exchange upgraded to 21CN last October and I switched to BT Broadband in December 2012. I have now got a very stable connection (~7.3 Mbps with Line Attenuation (Down/Up): 40.6 dB / 22.5 dB ). The modulation is the old G.992.1 Annex A so the upload speed is just 448 kbps with a real-life throughput of 340 kbps.
Am I right in thinking that other modulation methods are possible and that I could get higher speed upload?
If that is the case, how do I best request BT do something about the modulation method? There are probably some key phrases that would help communicate the request (i.e. BT jargon.)