scope:

This International Standard defines the OSI Physical Service in terms of a) the primitive actions and events of the Service; b) the parameters associated with each primitive action and event, and the form which they take; c) the interrelationship between, and the valid sequences of, these actions and events. The principal objective of this International Standard is to specify the characteristics of a conceptual Physical Service and thus supplement the OSI Basic Reference Model in guiding the development of Physical Layer protocols. This International Standard does not specify individual implementations or entities and interfaces within an information processing system. There is no conformance of equipment to this Physical service Definition standard. Instead, conformance is achieved through implementation of conforming OSI Physical protocols that fulfil the Physical Service defined in this International Standard.