High-Level Data Link Control

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High-Level Data Link Control (HDLC) is a bit-oriented code-transparent synchronous data link layer protocol developed by the International Organization for Standardization (ISO). The standard for HDLC is ISO/IEC 13239:2002.

Quick facts: Abbreviation, Purpose, Developer(s), Introduc...
High-Level Data Link Control
Communication protocol
PurposeData framing
Developer(s)International Organization for Standardization (ISO)
Introduction1979; 44 years ago (1979)
Based onSDLC
OSI layerData link layer

HDLC provides both connection-oriented and connectionless service.

HDLC can be used for point-to-multipoint connections via the original master-slave modes Normal Response Mode (NRM) and Asynchronous Response Mode (ARM), but they are now rarely used; it is now used almost exclusively to connect one device to another, using Asynchronous Balanced Mode (ABM).