I don't know much about this modem, but later modems tended to be "WinModems": modems whose firmware were contained in the Windows drivers. I have not use a modem in quite a while, but at one time Linux support for such modems were quite poor. I do not know if the same holds true today. Did you check USR's (or whoever the parent is now - is it still 3com?) website?
Last edited by goumba; 03-03-2013 at 03:57 PM.