You really need to study the Cisco's CLI guide as I would imagine that it supports user modulation mode selection. From there you should be able to force ADSL1 through ADSL2+ Mode and back etc at whim. Look out for Modulation or ITU G.992.x etc innside the web interface or the CLI guide.

I'm sure that I saw a post somewhere on ADSLG regarding a Cisco router and using an IS to properly upgrade the WAN interface for use over ADSL2+. Have a search for it. Also, this might help.

Edited by Deadbeat (Sun 13-Mar-11 12:44:38)

Andrue, have you tried different makes of router ? I used to think that matching the manufacturer at both ends of the line was twaddle until I went over to ADSL2+, and now I find that my Draytek router syncs at 5Mbps, whereas using a Zyxel router it will reliably sync at 7Mbps.