- Abbreviation of single-line digital subscriber line. A DSL technology, such as VDSL, using a single pair of copper wires, as opposed, for instance, to that using two or more pairs, as is the case with HDSL. Its abbreviation is SDSL (2).
- synonymsingle-line digital subscriber line
- Abbreviation of symmetric DSL. A form of DSL in which the upstream and downstream data rates are the same. SDSL can support data transfer rates exceeding 3 Mbps.