What is the difference between ADSL, SDSL, DSL, and xDSL?
DSL, also known as xDSL, is a generic name for all DSL technologies. First Link currently provides ADSL (Asymmetric Digital Subscriber Line). ADSL is a transport that allows faster flow of information (data, voice, and video) downstream than upstream. SDSL (Symmetric Digital Subscriber Line) supports one speed regardless of information flow. IDSL (ISDN Digital Subscriber Line) is an ISDN technology that rides over existing twisted copper telephone line.
