CAN/CSA-Z243.140-87

Scope
 
This 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 the actions and events.
 
The service defined in this 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 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 International Standard.