The Alcatel Speed Touch Home/Pro are ADSL modems popular by Linux users because they can work as modem's not just routers letting you terminate the ADSL line on your Linux machine instead of having a stupid device trying to do it.
There is also a newer SpeedTouch510 which is usually a single port adsl ethernet router, but I believe there is a version with a 4 port hub.
To configure your Alcatel under Linux, first add an alias on an ethernet interface for 10.0.0.1 (or some other IP in the 10.0.0.x/24 range that isn't .138) and point your web browser at !http://10.0.0.138/ you should be able to configure the IP address to what ever IP address makes sense for your internal network. Note this IP should be firewalled from having unauthorised people meddling with it! You might also want to set a password on the web/telnet interface.
and optionally add the word "debug" to the end of the line to get copious debugging sent to syslog(8)? :)
You are now connected to the Internet.
Some problems and solutions.
The modem can't get ADSL Sync. This means your line probably doesn't have ADSL connected to it, or the modem isn't plugged into the ADSL line.
The modem has sync'd with your ADSL line correctly, this is to be expected, see the point above :) Note, Telecom will quite happily tell you that a flashing ADSL Sync Light means that it's getting packets, they're wrong :P
This means it can't get ADSL sync. Check that it's plugged in, and that the line it's plugged into has ADSL enabled.
make sure you have PPP set to "persist"
where /etc/init.d/pptp is a script that starts pppd(8).
The web interface is smart enough not to let you remove an IP address you are already connected to. Add a new IP, connect to that IP, remove the old one.