Information technology - Telecommunications and information exchange between systems - High-level data link control (HDLC) procedures - Elements of procedures
The international community has decided to make this standard available only in
the English language version. It has been adopted as a National Standard of
Canada on this basis. This National Standard of Canada is equivalent to International Standard
ISO/IEC 4335:1993. 1. Scope This International Standard specifies elements of data link control procedures
for synchronous or start/stop, code transparent data transmission using the
HDLC frame structure specified in ISO/IEC 3309 and independent frame numbering
in both directions. These HDLC elements of procedures are defined specifically in terms of the
actions that occur on receipt of commands at a secondary station or a combined
station. This International Standard is intended to cover a wide range of applications;
for example one-way, two-way alternate or two-simultaneous data communication
between data stations which are usually buffered, including operations on
different types of data circuits; for example multipoint/point-to-point,
duplex/half-duplex, switched/non-switched, synchronous/start-stop, etc. The defined HDLC elements of procedures are to be considered as a common basis
for establishing different types of control procedures. This International
Standard does not define any single system and should not be regarded as a
specification for a data communication system. Not all of the commands or
responses are required for a particular system implementation.