DSL Advances

1.1 The Telephone Loop Plant

1.2 DSL Reference Model

1.3 The Family of DSL Technologies

1.4 DSL Protocol Reference Model

Digital subscriber line (DSL) technology transforms an ordinary telephone line into a broadband communications link, much like adding express lanes to an existing highway . DSL increases data transmission rates by a factor of twenty or more by sending signals in previously unused high frequencies. DSL technology has added a new twist to the utility of twisted-pair telephone lines.