Open Systems Interconnection

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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.
References in periodicals archive ?
The Open Systems Interconnection Reference Model was formally initiated by the International Organization for Standardization (ISO) in March, 1977, in response to the international need for an open set of communications standards [31].
Media converters are available in two formats, Layer 1 and Layer 2, referring to the functionality of the converter in relationship to the Open Systems Interconnection (OSI) model, which defines standards and promotes interoperability between various manufacturers of network equipment.
ONE's Foundation Product Suite provides Open Systems Interconnection (OSI) protocol solutions, agent development tools, mediation tools, and professional services.
400 MHS protocols make up the first full, seven-layered implementation of the International Standards Organization's (ISO's) Open Systems Interconnection (OSI) data communications reference model.
1, an X32 subgroup responsible for Open Systems Interconnection Architecture.
Apple announced three new products utilizing Open Systems Interconnection protocols.
positions for the committee's work program, which includes production of international standards for open systems interconnection, data communications, computer graphics, and various aspects of information technology.
The aim of the Y-NET project is to establish a pan-European distributed Open Systems Interconnection (OSI) network to provide all participants in ESPRIT and other EC R&D Programmes with improved communications and exchange of data, using OSI conformant software and equipment.
IBM also will assist users moving to Open Systems Interconnection (OSI) from TCP/IP.

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