Abbreviations

Results for area 5.1 Open systems interconnection (OSI)

term
Open Systems Interconnection (OSI)
definition

reference model developed by ISO to enable different or similar systems to dialogue with one another

NOTE 1 This model constitutes a reference framework for describing data exchanges. Each layer performs a service at the request of the adjacent higher layer, and in turn, requests more basic services from the lower layers. It is described in 7 layers.

NOTE 2 Open systems interconnection (OSI) is an international effort to facilitate communications among computers of different manufacture and technology.

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term
OSI model
definition

the International Standards Organization has developed a reference model, the Open Systems Interconnection (OSI) model, to enable different or similar systems to dialogue with one another; this model constitutes a reference framework for describing data exchanges; it is described in 7 ”layers”

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term
physical layer (L1)
definition

layer that defines the physical data transmission medium

NOTE The physical layer constitutes layer 1 of the OSI model.

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data link layer (DLL; L2)
definition

the conceptual layer of control or processing logic existing in the hierarchical structure of a station that is responsible for maintaining control of the data link

NOTE The data link layer functions provide an interface between the station higher layer logic and the data link. These functions include address/control field interpretation, channel access and command PDU (protocol data unit) /response PDU generation, transmission and interpretation.

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network layer (L3)
definition

layer that provides functional and procedural means of transferring variable length data sequences from a source to a destination

NOTE The network layer constitutes layer 3 of the OSI model.

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transport layer (L4)
definition

layer that provides transparent transfer of data between end users

NOTE The transport layer constitutes layer 4 of the OSI model.

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session layer (L5)
definition

layer that manages the dialogue between end-user application processes including restart, termination, and checkpointing

NOTE The session layer constitutes layer 5 of the OSI model.

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presentation layer (L6)
definition

layer that converts data using different syntax

NOTE The presentation layer constitutes layer 6 of the OSI model.

term
application layer (L7)
definition

top layer of the OSI seven-layer model as defined in ISO/IEC 7498-4

NOTE This layer defines the structure and format of the data packet content along with the rules and procedures for exchanging data packets.

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Ethernet
definition

specific combination of physical and data link layer protocols as defined in IEEE 802.3 that allow multiple systems to gain access to a shared medium and communicate with one another

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Transmission Control Protocol/Internet Protocol (TCP/IP)
definition

a transport protocol that provides reliable, bidirectional, stream-oriented network communication; TCP/IP is one of the foundation protocols of the Internet

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