Open System Interconnection reference model. Network architectural model developed by ISO and ITU-T. The model consists of seven layers, each of which specifies particular network functions such as addressing, flow control, error control, encapsulation, and reliable message transfer. The highest layer (the application layer) is closest to the user; the lowest layer (the physical layer) is closest to the media technology. The next to lowest layer are implemented in hardware and software, while the upper five layers are implemented only in software. The OSI reference model is used universally as a method for teaching and understanding network functionality. Similar in some respects to SNA. See application layer, data link layer, network layer, physical layer, presentation layer, session layer, and transport layer.
Short for Open System Interconnection, an ISO standard for Worldwide communications that defines a networking framework for implementing protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, proceeding to the bottom layer, over the channel to the next station and back up the hierarchy. At one time, most vendors agreed to support OSI in one form or another, but OSI was too loosely defined and proprietary standards were too entrenched. Except for the OSI-compliant X.400 and X.500 e-mail and directory standards, which are widely used, what was once thought to become the universal communications standard now serves as the teaching model for all other protocols. Most of the functionality in the OSI model exists in all communications systems, although two or three OSI layers may be incorporated into one. OSI is also referred to as the OSI Reference Model or just the OSI Model.
A model established by the International Standards Organization (ISO) that defines functions for allowing any combination of devices to communicate with each other. Th OSI model defines seven layers of communication that can occur between devices: Application, Presentation, Session, Transport, Network, Data Link, and Physical.
The seven layer model specified by ISO, which specifies particular network functions.
Open System Interconnection reference model. Network architectural model developed by ISO (International Organization for Standardization) and ITU-T (International Telecommunications Union Telecommunication Standardization Sector). The model consists of seven layers, each of which specifies particular network functions such as addressing, flow control, error control, encapsulation, and reliable message transfer. The OSI model is universally used as a method for teaching and understanding network functionality.
An "outline" of OSI that defines the seven layers of the model and their functions. Sometimes used to help describe other networks. Refer to Open Systems Interconnection (OSI) 7-Layer Network Layer Reference Model.
Seven-layer network architecture model of data communication protocols developed by ISO and CCITT. Each layer specifies particular network functions such as addressing, flow control, error control, encapsulation, and reliable message transfer.
The reference model, defined by the nternational tandards rganization (ISO), that provides a framework for an open network. The seven layers are physical, datalink, network, transport, session, presentation and application.
The International Standards Organization has developed the Open System Interconnection (OSI) network model that consists of seven different levels, or layers. By standardizing these layers and the interfaces in between, different portions of a given protocol can be modified or changed as technologies advance, or systems requirements are altered. The seven layers follow: 1. Physical; 2. Data Link; 3. Network; 4. Transport; 5. Session; 6. Presentation; 7. Application The IEEE 802.11 standard encompasses the physical layer (PHY) and the lower portion of the data link layer. The lower portion of the data link layer is often referred to as the Medium Access Control (MAC) sublayer.
(Open Systems Interconnection reference model). The OSI reference model is a worldwide industry standard used in computer networking to define how protocols communicate over a network. The OSI reference model was designed to help developers create applications that are compatible across multivendor products.Learning the OSI layers and functions helps to understand communications networks.Briefly, when one device in a network want to communicate with another by sending a message (for example, an e-mail), the message passes "down" through the layers of the model. Each of the seven layers attaches instructions to the message, until the complete package is in a suitable form to be passed across the network. The message is deciphered by the model as the message passes back up through the layers reaching its destination at the end. Also see Ethernet Fast Ethernet Hub Internet Network Router Switch
The seven-layer basic reference model that ISO 7498 (CCITT X.200) uses to describe how open systems should act and interact. The three primary kinds of interactions described in that reference model are the interactions: (a) inside layers, (b) between layers, and (c) between open systems. (I)
An "outline" of OSI which defines its seven layers and their functions. Sometimes used to help describe other networks.
A sevenlayer structure designed to describe computer network architectures and the way that data passes through them. The lowest levels handle the physical media and transmission characteristics of the network. The highest levels handle the user applications and data transmission. This model (sometimes referred to as the "seven-layer model") was developed by the ISO in 1978 to clearly define the interfaces in multivendor networks, and to provide users of those networks with conceptual guidelines in the construction of such networks. See also International Organization for Standardization. WWWebfx Home Page
See Open System Interconnection Reference Model.
A seven-layer structure designed to describe computer networkarchitectures and the way that data passes through them. Thismodel was developed by the ISO in 1978 to clearly define theinterfaces in multivendor networks, and to provide users of thosenetworks with conceptual guidelines in the construction of suchnetworks. See also: International Organization forStandardization.[Source: NNSC] OSIRIS