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Scope

This Recommendation/International Standard defines in an abstract way the externally visible service provided by the OSI Transport Layer in terms of:

(a) the primitive actions and events of the service; (b) the parameter data associated with each primitive action and event; (c) the relationship between, and the valid sequences of, these actions and events.

The service defined in this Recommendation/International Standard is that which is provided by all OSI Transport Protocols (in conjunction with the Network-Service) and which may be used by any OSI Session Protocol.

This Recommendation/International Standard does not specify individual implementations or products, nor does it constrain the implementation of entities and interfaces within a system. Conformance of equipment to this Recommendation/International Standard is achieved by conformance to the protocols specified to fulfill the Transport Service defined in this Recommendation/International Standard.