Can I seek a technical explanation for something that has been bugging me for a while.
It is pretty common to see a statement such as:
ADSL2+ Annex M will not give much up channel speed increase on long lines and may actually be slower than Annex A.
My question is WHY given that Annex M has nearly twice the up channel bandwidth. It is still located in the lower part of the spectrum and should still be less susceptible to degradation over distance (as the up channel is on Appendix A).
Thanks
