The most common meaning for ADSL is "Asymmetric Digital Subscriber Line." It is referring to a form of Digital Subscriber Line, which is a data communications technology.

An asymmetric digital subscriber line is a communications system characterized by moderately high speeds, different in each direction.

They incorporate technologies such as FDDI, DSL (digital subscriber line), satellite, and microwave communications

Digital subscriber line

dismally slow line� haha, saw it on a billboard - thought it was funny/TRUE

originally stood for digital subscriber loop. It is broadband technology that allows high-speed internet access through your standard phone line.

Digital subscriber line