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(Created page with "{{OSI model}} The '''Open Systems Interconnection model''' ('''OSI model''') is a conceptual model that characterizes and standardizes the communication functions of a t...") |
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The '''Open Systems Interconnection model''' ('''OSI model''') is a [[conceptual model]] that characterizes and standardizes the communication functions of a [[telecommunication]] or computing system without regard to their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into [[abstraction layer]]s. The original version of the model defined seven layers. | <div style="float: right; margin-left: 12px">__TOC__</div> | ||
The '''[[Open Systems Interconnection model]]''' ('''[[OSI model]]''') is a [[conceptual model]] that characterizes and standardizes the communication functions of a [[telecommunication]] or computing system without regard to their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into [[abstraction layer]]s. The original version of the model defined seven layers. | |||
A layer serves the layer above it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that comprise the contents of that path. Two instances at the same layer are visualized as connected by a ''horizontal'' connection in that layer. | A layer serves the layer above it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that comprise the contents of that path. Two instances at the same layer are visualized as connected by a ''horizontal'' connection in that layer. | ||