Digital Subscriber Line
From Unofficial BOINC Wiki
A technology that uses the ordinary copper telephone lines to provide to the subscribers Internet speeds ranging from 1.5 to 9 Mbps. These are speeds that are 30 to 50 times faster than a regular 56-kbps Dial-Up Modem. DSL also allows users to receive voice and data at the same time because the digital information is carried on a higher frequency than humans can hear (the human ear, in general, cannot hear sounds higher than 15 Kilo-Hertz) or use for normal telephone communications.