What Is DSL Internet Connection?
DSL uses a sophisticated modulation scheme to pack data onto copper wires. DSL is sometimes referred to as a last-mile technology because it is used only for connections from a telephone switching station to a home or office
What is a Cable Internet Connection? Through the use of a cable modem you can have a broadband Internet connection that is designed to operate over cable TV lines. Cable Internet works by using TV channel space for data transmission, with certain channels used for downstream transmission, and other channels for upstream transmission. Because the coaxial cable used by cable TV provides much greater bandwidth than telephone lines, a cable modem can be used to achieve extremely fast access to the Web.
Cable vs. DSL: The Speeds
The topic of “which is better and faster” has been a highly debated topic, and still there doesn’t appear to be a clear winner.
See the whole thing here; Cable Vs. DSL