I have been through a 'dark night of the soul' trying to get this configured, with the help of gleanings from the Internet, a lot of trial and error, but with zero from the Demon ADSL (so-called) Technical Helpdesk.
I am running Windows 98SE with the Alcatel Speed Touch PC ADSL modem card and connecting to Demon as ISP. An ADSL link is only supplied by BT in the UK, I believe. There is no guarantee that these settings will work for anyone else, but it may be a good start and an encouragement to try various configurations.
The protocol is RFC2364, point-to-point protocol over ATM. I understand that this is the only one supplied by BT. This affects the driver you choose to load for the modem.
Installation of the card and loading of the drivers is as expected and goes according to the instructions. It produces a new entry in 'Dial up networking' folder (usually found under Start Menu/Programs/Accessories/Communications).
Right clicking the system tray icon and choosing 'Configuration' is where the puzzle starts. I have set VPI (virtual path identifier) to 0 and VCI (virtual channel identifier) to 38. I understand this is the same for all BT's ADSL.
The Framing I found that works is 'VC MUX' (Virtual Circuit Multiplexing) not 'LLC/SNAP' (Logical Link Control/Sub-Network Access Protocol). If you change this setting, you have to click the 'Setting' button and reboot. Only one mode is ticked: 'ITM G.992.1 (G.dmt)'.
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