1、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, an
2、d 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 | Internatio
3、nal 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 fulfil the Transport Service defined in this Recommendation | International Standard.
