what is xdsl
xDSL Technology Overview. DSL is a digital broadband transmission technology that involves sending digital information over a subscriber's telephone line, also referred to as the local loop.SL in general describes the technology, while xDSL represents individual varieties of DSL technology. The x in xDSL is a variable that changes depending upon the speed and application of the xDSL technology (e.g., ADSL, VDSL, etc.).