More commonly know as Broadband. A broadband connection between a subscriber and the local exchange uses existing copper telephone lines. ADSL can send a large quantity of data (eg a TV picture) in one direction (download speed) and a small quantity (eg a telephone call) in the other (upload speed). Speeds range from 128kb/s up to 2Mb/s for download. Upload speeds are typically limited to 256kb/s. Higher upload speeds are possible with SDSL.
A technology that allows more data to be sent over existing copper telephone lines (POTS). ADSL supports data rates of from 1.5 to 9 Mbps when receiving data (known as the downstream rate) and from 16 to 640 Kbps when sending data (known as the upstream rate). ADSL requires a special ADSL modem. It is not currently available to the general public except in trial areas, but many believe that it will be one of the more popular choices for Internet access over the next few years.
This technology allows for faster data exchange rates through your regular copper phone line. Speeds of 1.5 to 9 Mbps downstream rate and 16 to 640 Kbps upstream rate.