I have been using ADSL(1) for several years on my 3.9km line and if I force the SNRM down to 3.0, I can get onto a 3000 profile. The line is very stable and sits happily on an SNRM of 3.0 for weeks at a time. In the late evening it drops down to around 0.7, but the DSL2640B router never drops out.
I have just moved to ADSL2+ and my sync speed has increased to 4215, whereas it never went over around 3600 on ADSL(1).
Bearing in mind that I am never going to benefit from the higher frequencies used on ADSL2+, I have read that it is usually possible to get a better sync speed and more of a stable line by forcing ADSL2, as opposed to ADSL2+.
DAK if this is correct? I could just try it, but I am loathe to mess around too much at present as I am still on my training period - Or is this the best time to see if I can get a higher sync speed?