dsl (digital subscriber line)

Short for Digital Subscriber Line, telecommunications protocol allowing existing copper phone lines to be used for high-speed transfer of data. Includes ADSL (Asymmetric DSL), SDSL (Single-line DSL), HDSL (High-data-rate DSL), VDSL (Very-high-data-rate DSL). Most common, ADSL, allows for download speeds up to 9 Mbps, upload speeds up to 640 Kbps, commercial performance usually less.