Just to let other people know, there are serveral kinds of DSL.
SDSL-(Synchronous Digital Subscriber Line)- it acts much like high bandwidth dedicated lines(T1, FR...) in that it transfer/recieves data at the same time. The most expensive kind of DSL.
ADSL-(Asyncronous DSL)- it can only transmit or recieve at one time. This is the usual "DSL" that you hear about all the time on commericials, or that run to your house. Bandiwdth is variable, you pay more for more bandwidth.
IDSL-(ISDN DSL)- Pretty much this sucks... in my opinion. It runs at a top speed of around 144kpbs, but the advantage is that it can be recieved much farther out from a CO. Also, it can only transfer data, no voice, but there is no call setup time like ISDN, so it is an "always-on" connection.
I just though I would clarify because "DSL" really has several different forms. There are ADSL WIC's for the 2600 series, but I'm not sure about SDSL, and since IDSL is fairly new and not widespread, I doubt there is one for it. Let me know if this helps clarify what "DSL" is, somewhat....
burke