CAN/CSA-ISO/IEC-4335-95 (R2000)

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.