The changes in the forces that shape the communications industry have been well documented and are nearing the level of common knowledge; examples include regulation and technology.
Digital subscriber line (DSL) is the technology that is employed between a customer location and the carriers network that enables more bandwidth to be provided by using as much of the existing network infrastructure as possible.
preview:
http://www.iec.org/online/tutorials/voice_dsl/
2/26/2004