1

Scope

1.1

This ITU-T Recommendation / International Standard defines (in an abstract way) the externally visible service provided by the OSI Presentation Layer in terms of (a) the primitive actions and events at the user/service boundary; (b) the parameter data associated with each primitive action and event; (c) the relationship between, and the valid sequences of, those actions and events.

1.2

The service defined in this ITU-T Recommendation / International Standard is the connection-oriented service which is provided by the OSI connection-oriented presentation protocol and the connectionless service which is provided by the OSI connectionless presentation protocol, each in conjunction with the OSI session-service.

The connection-oriented presentation service defined in this ITU-T Recommendation / International Standard may be used by an OSI application protocol defined for connection-oriented transmis sion. The connectionless presentation service defined in this ITU-T Recommendation / International Standard may be used by an OSI application protocol defined for connectionless transmission.

1.3

This ITU-T Recommendation / International Standard does not specify individual implementations or products, nor does it constrain the implementation of entities and interfaces within a computer system. There is therefore, no conformance to this ITU- T Recommendation / International Standard.