Hm, are you sure? It has a jumper to change it to "PCI" instead of "LAN", which I guess would expose directly a PPP interface, but I can't seem to find any documentation on that feature.

Edit: well, you were right. It seems to be a full blown Linux-based router, just with a weird form factor: http://tjworld.net/wiki/Linux/Embedded/Infineon/Danube/ADSL2...