| high-level data-link control [`hī ´lev·ǝl `dad·ǝ ´liŋk kǝn´trōl] COMMUNICATIONS A bit-oriented protocol for managing information flow in a data communications channel that supports both full-duplex and half-duplex transmission, and both point-to-point and multipoint communications using synchronous data transmission. COMPUTER SCIENCE A communications protocol that allows devices from different manufacturers to interface with each other and standardizes the transmission of packets of information between them. Abbreviated HDLC. |