I have just configured a Cisco 2600XM with a WIC1 ADSL card to connect to a UK ADSL provider (Virgin). This config should be pretty standard and I have used a similar one a few times before so I am posting it as a reference others and myself in the future. I am leaving out the specifics of the internal network such as the FastEthernet config and DHCP as these are separate issues really. This is just a focus on the ADSL side of things.

The first interface you need to configure is the ATM interface as shown in the code below.

interface ATM0/0
no ip address
no ip mroute-cache
no atm ilmi-keepalive
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode auto
hold-queue 224 in

Now you need to configure your Dialer interface to authenticate and communicate with your ISP as follows:

interface Dialer0
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname
ppp chap password 0
Obviously in the above example and need to be replaced with your actual username and password from your ISP.

This should allow your ADSL card to create a connection with your ISP and now you just need to configure your internal networks, easy peasy…