You can force the cisco device to connect at a slower/more stable connection. Go into config and type the following:
int atm 0
dsl noise-margin (a value between -3 and 3).
The service internal command exposes the dsl noise-margin command (and other hidden/non standard commands)
dsl noise-margin forces the router to training at a higher noise margin (sacrificing speed for stability). Setting this to 3 for example should see you get a higher noise margin, slower speed (and depending on fimware) a higher attenuation.
Start at 3 and work your way down to 0 in 0.5 steps until you get a stable connection. A value of 0 is the same as not having this command at all (eg: normal settings).
If you add a dsl noise-margin command, after a reload you’ll see “WARNING: Unsupported Command. May cause violation to ADSL standards.” on bootup, ignore it, it’s just the addition of the noise-margin command.
Handy – Notes