What kind of telephone line do you need for DSL?

Any standard phone line will do. My daughter lives in a house with 50-year old wiring, and her DSL works fine. What is really important is how close you are to a call center. That is a cenral routing station, owned and operated by the phone company. If you live further than 1/2 mile, the service degrades proportionally. One good way to find out if you are close to one is to go to say, SBC, (or your phone provider) and apply for DSL service. Before you commit, they will analyze your phone number and tell you if you qualify.