high-level data link control

High-Level Data Link Control (HDLC) is a bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO). The original ISO standards for HDLC were: ISO 3309 — Frame StructureISO 4335 — Elements of ProcedureISO 6159 — Unbalanced Classes of ProcedureISO 6256 — Balanced Classes of Procedure
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A Link-Level protocol used to facilitate reliable point-to-point transmission of a data packet. Note: A subset of HDLC, known as "LAP-B," is the Layer-two protocol for CCITT Recommendation X.25.

<networking> (HDLC) A general-purpose data link control protocol defined by ISO for use on both point-to-point and multipoint (multidrop) data links. It supports full-duplex, transparent-mode operation. It is used extensively in both multipoint and computer networks.
Some manufacturers and other standards bodies still use their own acronyms, e.g. IBM's SDLC (Synchronous Data Link Control), the forerunner of HDLC and ANSI's ADCCP (Advanced Data Communications Control Procedure).
[Fred Halsall, "Data Communications, Computer Networks and Open Systems" 4th edition, 1996, p.237, Addison-Wesley Publishing Co. Reading, Mass., USA].
(1997-11-09)

High-level Data Link Control