meaning of open systems interconnect

1. Open Systems Interconnect Open Systems Interconnection Open Systems Interconnection OSI-RM, OSI Reference Model, seven layer model A model of network architecture and a suite of protocols a protocol stack to implement it, developed by ISO in 1978 as a framework for international standards in heterogeneous computer network architecture. The OSI architecture is split between seven layers, from lowest to highest: 1 physical layer, 2 data link layer, 3 network layer, 4 transport layer, 5 session layer, 6 presentation layer, 7 application layer. Each layer uses the layer immediately below it and provides a service to the layer above. In some implementations a layer may itself be composed of sub-layers. OSI is the umbrella name for a series of non-proprietary protocols and specifications, comprising, among others, the OSI Reference Model, ASN. 1 Abstract Syntax Notation 1, BER Basic Encoding Rules, CMIP and CMIS Common Management Information Protocol and Services, X. 400 Message Handling System, or MHS, X. 500 Directory Service, Z39. 50 search and retrieval protocol used by WAIS, and many others. Apart from its actual application to real protocols, it also serves as a useful teaching model.

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