Hi rdratlos (& All)
I can confirm that the "ADSL2+ PCI Card - Single Port ADSL Modem - Annex A"
works fine on
one of my ROS x86 based systems in production use.
As suggested, the card shows as a normal Realtek NIC to ROS, so you just
set that port to use teh dhcp-client and thats it.
Nick (from LinITX.com) and a few others hang out over on IRC (#routerboard & #linitx)
on irc://irc.z.je and am sure we can help you get it going if you have any issue.