The 827 has its own ATM interface, you do not need (and cannot use) an
external ADSL "modem" with the 827.
Go to Cisco's public site at http://www.yqcomputer.com/
827 configuration example
That should return PLENTY of info for you. Please note that ALL
configurations are dependent on your ISP's method of service delivery,
you just need to find the one that fits the way YOUR service is
delivered (PPPoA, PPPoE, Bridged, etc...).
*** Replace SOMEONE with prk ***