Use
debug atm events
to see the atm training process. This should show a detailed output as the atm interface comes up
Use
debug ppp auth
to view the dialer auth process. It should be clear from the output if the username/pass is bad
Use
sh dsl int atm0
to view detailed info on the DSL interface atm0. Look out for a very low (close to 1dB) or negative Noise Margin. This is difference between the maximum acceptable noise for ADSL profile assigned by the carrier and the actual noise on the line. The number shown is the actual noise subtracted from the maximum acceptable noise, so a positive number is good.
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