Internetwork Protocol

Article Abstract:

An internetwork protocol allows users on different subnetworks to communicate. Both the International Organization for Standardization (ISO) and the European Computer Manufacturers Associations (ECMA) divide the Network Layer into a routing and relay function, a correcting subnetwork, and data transfer groups. The Network Layer can offer connection-oriented or connectionless internetworking. The quality of service of the Network Layer can vary and may be difficult or impossible to improve. A global Open Systems Interconnection (OSI) Network Layer addressing standard is necessary to identify Network Service Access Points (NSAPs) within any OSI end system. Intranetwork segmentation and reassembly and transnetwork segmentation and reassembly are often needed. Other technical issues of interest to OSI are error checking and reporting, multiplexing and splitting, source routing and recording of route, and flow control. Layer management concerns are difficult and poorly understood protocol problems.

Network Layer Control, Transport Layer Control, ECMA

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Status of CCITT Description Techniques and Application to Protocol Specification

Article Abstract:

Standardized data communication procedures are abssolutely essential to open communication between interconnected computer systems. 'Formal Description Techniques' are being studied to aid in design and specification of data communication standards. Applicability, readability, and formality are requirements set forth by the CCITT for a formal description language. The abstract machine used in the Specification and Decription Language (SDL) is an extension of the finite-state machine (FSM). The main graphical symbols in SDL are related to system structure, process diagrams, and signals and data objects. An example illustrates a Transport Entity which implements the Class O Transport Protocol and process diagrams. All diagram symbols are explained and a table summarizes relationships between concepts in the reference model and the SDL.

CCITT, Formal Languages

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Fundamentals of the Layer Service Definitions and Protocol Specifications

Article Abstract:

The Open Systems Interconnection (OSI) Reference Model facilitates communication between systems various techniques to form a modular structure. To establish rules for communication, demarkation represents a boundary between functions called a service. This point of interaction between a service user and a service provider is called a service access point. Layering, protocols, and interfaces define other constraints in the model of user and provider interaction. A single set of descriptive conventions has been established to provide a common specification style. Extensions of the models are necessary for description of combination of media and the generalization of the number of user services. Diagrams illustrate concepts.

Interface, Network Models

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