Thanx for your response!
I follwed this site benoit.papillault.free.fr/speedtouch/user.en.php3 with it's driver.
I think I have all requirements, and installed and configured everything succesfully. Then I used this line:
/usr/local/bin/modem_run -f /path/to/mgmt.o -m
to upload the firmware, succesfully. Then I had to connect with:
pppd call adsl
this command didn't do anything, and I didn't have any internet connection.
I hope you remember...