ISO/IEC 13236-ed.1.0

Podrobné informácie

Označenie: ISO/IEC 13236-ed.1.0

Dátum vydania: 17.12.1998

Stránok: 48

Krajina: Medzinárodná technická norma

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Anotácia

This QOS Framework is a structured collection of concepts and their relationships which describes QOS (Quality of Service) and enables the partitioning of, and relationships between, the topics relevant to QOS in Information Technology (IT) to be expressed by a common means of description. In particular, this QOS Framework is directed at IT systems and their use in providing Open Distributed Processing services. This QOS Framework is intended to assist those designing and specifying IT systems, and those defining communications services and protocols, by providing guidance on QOS applicable to systems, services and resources of various kinds. It describes how QOS can be characterized, how QOS requirements can be specified, and how QOS can be managed. This QOS Framework defines terminology and concepts for QOS in IT. It introduces the concept of QOS characteristics, which represent the fundamental aspects of QOS that are to be managed in various ways; and it defines a number of QOS characteristics of particular importance. These definitions are independent of how QOS is represented or controlled in a real system. This Framework describes how QOS requirements can be expressed, and identifies a number of QOS mechanisms (such as three-party negotiation) that can be used as components of QOS management functions to meet QOS requirements of various kinds. It also describes the circumstances in which various combinations of mechanisms may be appropriate. This QOS Framework provides a basis for the specification of extensions and enhancements to existing or planned standards, as a result of the need for, and application of, the QOS concepts defined in this Recommendation | International Standard. It is not the intent of this Recommendation | International Standard to destabilise any existing Recommendations | International Standards; rather, it is intended that this QOS Framework may be used by: · developers of new or revised IT-related standards which define or use QOS mechanisms; and · IT users expressing requirements for QOS. This QOS Framework does not attempt to provide a basis for the specification of performance objectives or network signalling of QOS in public communications networks. The QOS aspects of these communications services are addressed by other ITU-T Recommendations. The intent of this Recommendation | International Standard is to provide a common vocabulary to both service providers and service users. Nothing in this Recommendation | International Standard should be construed as placing requirements on either service providers or service users. It is hoped that a common approach and vocabulary for QOS will assist multiple service providers to deliver end-to-end QOS to end-systems. This QOS Framework specifically excludes the detailed specification of QOS mechanisms. It is not the intent of this Recommendation | International Standard to serve as an implementation specification, to be a basis for appraising the conformance of implementations, or to define particular services and protocols. Rather, it provides a conceptual and functional framework for QOS which allows independent teams of experts to work productively on the development of Recommendations | International Standards. As applied to OSI, this QOS Framework is consistent with the OSI Basic Reference Model in that it describes operations and mechanisms which are assignable to layers as specified in the OSI Basic Reference Model. It is consistent with the OSI Management Framework (see ITU-T Rec. X.700 | ISO/IEC 7498-4) and the Systems Management Overview (see ITU-T Rec. X.701 | ISO/IEC 10040) in its assignment of functions to management entities. In Annex A, this QOS Framework presents a model of QOS for OSI which identifies the entities that participate in the management of QOS, defines the flow of QOS-related information between them and describes how this information is used. On entend ici par lexpression cadre general de qualite de service (cadre QS) un ensemble structure de concepts interdependants decrivant la qualite de service (QS) et permettant dexprimer par des methodes de description communes les subdivisions entre les differents sujets se rapportant a la qualite de service dans le domaine des technologies de linformation et les correlations entre ces sujets. Ce cadre general de qualite de service est notamment destine aux systemes mettant en oeuvre les technologies de linformation et a lutilisation de ces systemes pour la fourniture de services de traitement reparti ouvert. Ce cadre general de qualite de service a pour but daider les specialistes concernes, quils soient charges de concevoir les systemes mettant en oeuvre les technologies de linformation et detablir les specifications de ces systemes ou de definir les services et les protocoles de communication, en leur donnant des directives sur la qualite de service applicable aux divers types de systemes, de services et de ressources. Il indique les modalites permettant de definir la qualite de service, de specifier les prescriptions de qualite de service et de gerer la qualite de service. Ce cadre general de qualite de service definit la terminologie et les concepts applicables a la qualite de service dans le domaine des technologies de linformation. Il introduit le concept de caracteristiques de qualite de service, qui recouvre les aspects fondamentaux de la qualite de service qui doivent etre geres de diverses manieres; il definit en outre un certain nombre de caracteristiques de qualite de service particulierement importantes. Ces definitions sont independantes de la maniere dont la qualite de service est representee ou controlee dans un systeme reel. Indiquant comment les prescriptions de qualite de service peuvent etre exprimees, ce cadre general recense en outre un certain nombre de mecanismes de qualite de service (negociation entre trois participants, par exemple) qui peuvent etre utilises dans le cadre des fonctions de gestion de la qu