synchronous data-link control
- noun (written as synchronous data link control)a data transmission protocol, most often used in IBM’s Systems Network Architecture, that defines how synchronous data is transmitted.
- A bit-oriented communications protocol utilized for the control of synchronous transmissions over communications links. Its abbreviation is SDLC.
- noun data transmission protocol most often used in IBM’s Systems network architecture (SNA). It defines how synchronous data is transmitted.