DSL: Digital Subscriber Line
DSL - Digital Subscriber Line (originally Digital Subscriber Loop) - is a family of technologies that are used to transmit digital data over telephone lines. In telecommunications marketing, the term is widely understood to mean Asymmetric Digital Subscriber Line (ADSL), the most commonly installed DSL technology, for Internet access. The service can be delivered simultaneously with wired telephone service on the same telephone line. This is possible because it uses higher frequency bands for data. On the customer premises, a filter on each non-DSL outlet blocks any high-frequency interference to enable simultaneous use of the voice and DSL services.