I am not sure about IP Base, which is what the user may have. Post a sh ver. I do believe you should be able t0 do this no matter what...
router>en
router#conf t
router(config)#int e0
router(config-if)#duplex auto
router(config-if)#speed auto
router(config-if)#end
router#wr
I also agree with Andy and Minue---you can get a WIC-1ADSL fairly cheap, which is a modular ADSL WAN WIC card for the 1700/2600 series routers, or a C837 or C877 router, or C877W for wireless. These are all adsl routers with the ATM interface built in. I have a 2620XM at home with a WIC-1ADSL and it has been flawless.
Burt