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High-level Data Link Control Procedures (HDLC) - Frame Structure

3rd edition, January 1980

This Standard ECMA-40 defines the frame structure for bit sequence independent data transmission. This structure is intended for use in High-Level Data Link Control (HDLC) applications.

This Standard defines in detail the relative positions of the various components of the basic frame, the bit combination of the frame delimiting sequence, the mechanism used to obtain total transparency within the frame and the frame checking sequence used.

Other standards define the details of the address and control fields and the procedures used during the transmission.


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Technical CommitteeTC9 (this TC is no longer active)


  • ECMA-40, 1st edition, December 1973Download
  • ECMA-40, 2nd edition, September 1976Download