Is a range of digital broadband transmission technologies that involves sending digital information over a subscriber's telephone line or Digital Subscribers Line (DSL). xDSL refers to the family of dsl technologies which include asymmetric (ADSL), high-bit rate (HDSL), single-line (SDSL), and very-high-data-rate (HDSL).

Each type has advantages and disadvantges with differences in symetry, signal distance, and speed. ADSL is the most popular technology for broadband communications in home and business use.

References for the glossary can be viewed by clicking here.