I'm assuming you just don't know what driver to use?
Is there anything you've tried so far that has been unsuccesful?
I quick bit of googling brought me to http://pctelcompdb.sourceforge.net/v...ls.php?id_no=5
Which says that there are working drivers for kernels 2.2.19 and 2.4.16 and up.
I'm not sure if you'd just want to compile the latest kernel or if you'd want to try and find the module and install it.
I also found a mini-howto on the configuration of your particular modem:
I'd recommend starting off with that and if it doesn't answer your questions post again.
Hope that helps!