Open System Interconnection reference model

This network became known as ARPANET. In the I980 s the International Organization for Standardization (ISO) implemented its Open Systems Interconnection—Reference Model (OSI—RM) to facilitate the interoperability of different hardware components. The creation in the I990 s of new software and programming languages, such as browsers and HTML, made the explosive growth of Internet activity and Web sites possible. 

OSI. 1994. X.200 Information technology - Open System Interconnection - Basic Reference Model The basic model. 

Testing a local area network (LAN)—whether copper, fiber optic, or wireless—presents special challenges to the design engines or maintenance technician. The protocol analyzer is commonly used to service LANs and other communications systems. The protocol analyzer performs data monitoring, terminal simulation, and bit error rate tests (BERTs). Sophisticated analyzers provide high-level decide capability. This ability refers to the open system interconnection (OSI) network seven layer model. These functions enable the engineer to observe activity of a communications Hnk and to exercise the facility to verily proper operation. Simulation capability is usually available to emulate almost any data terminal or data communications equipment. 

One of the first standards for computer communications was proposed and developed by the International Standards Organization (ISO) in the early 1980s. This network architecture model, the open systems interconnection (OSI) reference model shown in Fig. 1, describes a network through seven layers. On any of these layers, one or more protocols can implement the functions specified for the layer. Some protocol specifications based on this... 

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