My Network Adaport has worked just fine with my Launch PS2 as well.
Questions to asess the problem.
What model is ur PS2?
How are you trying to connect into your DSL? Directly into modem or through a router, or a switch/hub to router?
I know that the first router that I had, prevented me from hearing talking in game. I could talk out, and my teammates coulds hear me, BUT when they talked i couldnt hear them. It was the built in firewall that was creating the issues. When I moved back home, i plugged directly into the modem and had to reconfigure settings for it to work, and when i moved out again, i had to change the settings AGAIN so it would go online in the same type setup as before. (connected thru switch, to router) When i added my HDD for FF XI, it started the intial configuration, but ive still been yet to verify Step 3 for PlayOnline. I think its going to make me reconfigure once again, cause it can no longer detect online at all. Its kinda finkey, but that software disc is a help of helps, redoing the settings might be whats needed.