ITU-T Y 120-1998 Global Information Infrastructure Scenario Methodology - Series Y Global Information Infrastructure - General《基于Scenario全球信息基础设施方法论-Y系列 全球信息基础设施 总研究组13 17页》.pdf
《ITU-T Y 120-1998 Global Information Infrastructure Scenario Methodology - Series Y Global Information Infrastructure - General《基于Scenario全球信息基础设施方法论-Y系列 全球信息基础设施 总研究组13 17页》.pdf》由会员分享,可在线阅读,更多相关《ITU-T Y 120-1998 Global Information Infrastructure Scenario Methodology - Series Y Global Information Infrastructure - General《基于Scenario全球信息基础设施方法论-Y系列 全球信息基础设施 总研究组13 17页》.pdf(17页珍藏版)》请在麦多课文档分享上搜索。
1、STD. ITU-T RECMN I1998 48b259L Ob52523 INTERNATIONAL TELECOMMUNICATION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU SERIES Y: GLOBAL INFORMAT Gen eral ON 834 UNION YA20 (06/98) NFRASTRUCTURE Global Information Infrastructure scenario methodology ITU-T Recommendation Y. 120 (Previously CCIlT
2、 Recommendation) _ STD-ITU-T RECMN Y.LZ0-ENGL 199 4b2591 Ob52524 770 = ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE General Y.100-Y.199 Services, applications and middleware Network aspects Interfaces and protocols Numbering, addressing and naming Operation, administration and ma
3、intainance Security Y .200-Y .299 Y.300-Y.399 Y .400-Y .499 Y.500-Y.599 Y.600-Y.699 Y.700-Y.799 For further details, please refer to ITU-T List of Recommendations. - sTD.1TU-T REC“ Y.120-ENGL 1998 4862.593 Ob52525 607 = ITU-T RECOMMENDATION Y.120 GLOBAL INFORMATION INFRASTRUCTURE SCENARIO METHODOLOG
4、Y Summary This Recommendation describes a set of graphical techniques that can be used to simply illustrate scenarios which depict a variety of interconnected network technologies, and the associated key interfaces that may be encountered in the provision of the Global Information Infrastructure (GI
5、I). Source ITU-T Recommendation Y. 120 was prepared by ITU-T Study Group 13 (1 997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 12th of June 1998. Keywords Global Information Infrastructure, GII, standardization, networks, scenarios, interfaces. FOREWORD ITU (International
6、 Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations
7、 on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The ap
8、proval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation,
9、 the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a
10、claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, t
11、he ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 199
12、8 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the IT. Recommendation Y.120 (06198) 11 STD.ITU-T RECMN Y.120-ENGL I1998 = Y862591 Ob52527
13、YBT 1 1.1 1.2 2 3 4 5 6 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 8 8.1 8.2 8.3 9 10 10.1 10.2 10.3 10.4 10.5 11 CONTENTS Introduction The need . The purpose Scope Normative references Terms and definitions . Abbreviations . Building a scenario . Principles of description . Generic elements Interface denotation
14、 Element representation . Appliances and functional units An Example configuration of generic elements . Other dependencies . Identification of information flow(s) 7.3.1 Networks . 7.3.2 Indirect connections or associations . Types and Qualifiers . Interface classifications Sub-Type classifications
15、. Qualifiers for protocol profile designation . Service aspects Method of application . Step 2 - Initial scenario development Step 4 - Collaboration amongst organizations . Examples of use Step 1 - Initial scenario need identification . .I. Step 3 - Scenario socialization . Step 5 - Iteration Page 1
16、 1 1 2 2 3 3 4 4 4 4 5 5 .5 5 6 7 7 8 8 8 8 9 9 9 9 10 10 10 10 . Recommendation Y.120 (06/98) 111 Reco mmendation Y. 120 GLOBAL INFORMATION INFRASTRUCTURE SCENARIO METHODOLOGY (Geneva, 1998) 1 Introduction This Recommendation describes a set of techniques that can be used to graphically illustrate
17、configurations of a variety of network technologies and user appliance that may be expected to be encountered in the context of the Global Information Infrastructure (GII). The term “scenario“ has been adopted to denote a combined graphical and textual representation of such a configuration. 1.1 The
18、need In some cases the GI1 will comprise components from different industry sectors, i.e. telecommunications, information technology and entertainment. The boundaries of service provision are no longer distinct, and the convergence between the industry sectors is occurring, and more diverse service
19、delivery technologies are emerging. Because of the different backgrounds of the participants, a mutually understood methodology is required in order that scenarios can be developed and analyzed in a consistent fashion. The provision of various services by a variety of service providers, over a varie
20、ty of network technologies, from different industry sectors, makes provision of end-to-end service a significant system integration issue. In order to understand the related standards issues, it is necessary to understand the interdependencies amongst all components in the system as well as those be
21、tween immediately adjacent components at a single interface. This need can only be met by examining the interplay and inter-relationships amongst all components within a given scenario. The task can be made more manageable if a number of interacting components can be depicted in a single diagram. NO
22、TE - It is not envisaged that all situations can be fitted into a single diagram. Clearly, some step-wise refinement will be necessary in the most complex cases. However, the principle holds true for each levei of abstraction in cases where a number of different levels of abstraction are required. 1
23、.2 The purpose The purpose of a scenario is to enable specific arrangements of certain GI1 components to be illustrated. Interesting cases occur when technologies from different industries come together andor where services traditionally offered by particular providers over particular technologies a
24、re offered by non-traditional providers over non-traditional technologies. Examples of this are telephone service over cable TV network or video services over local loop networks. Other interesting cases involve the interconnection of technologies not previously interconnected and/or the non-traditi
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