You should have posted in "Open Source" section. That would have got you more responses.
Anyways...I searched around and looks like your modem is supported by eciadsl drivers.
http://eciadsl.flashtux.org/modems.php?modem=9
For the documentation, look at the following link. Follow the documentation and install the drivers
http://eciadsl.flashtux.org/doc.php?...g=en&view=html