The Data Pipeline in ISO/OSI-Reference Model and the Classifying to Service Access Point

This paper describes the behavior of (n) Protocol Machine (n)PM from the data pipeline point of view. The (n) PM is defined in Open System Interconnection OSI Reference Model specified ??y international Standard Organization ISO. The formats of data units in (n) layer of OSI Reference Mode, and their relations are discussed in detail In addition, a simple and easy approach to test and verify the realization of (n) PM is presented. Finally, two cases: classifying (n) SAPs and unclassifying (n) SAPs are discussed 100.