ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp

pdf标准 ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp

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ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp 第 1 页 ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp 第 2 页 ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp 第 3 页 ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp 第 4 页 ITU-T E.431-1992 连接建立和释放延迟的服务质量评估 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,连接,建立,释放,延迟,服务,质量,服务质量,评估,service,quality,assessment,for,connection,set,up,and,release,delays,study,group,ii,pp

INTERNATIONAL TELECOMMUNICATION UNION CCITT E.431 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING SERVICE QUALITY ASSESSMENT FOR CONNECTION SET-UP AND RELEASE DELAYS Recommendation E.431 Geneva, 1992 FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation E.431 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 16th of June 1992. ___________________ CCITT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. © ITU 1992 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 ITU. Recommendation E.431 Recommendation E.431 SERVICE QUALITY ASSESSMENT FOR CONNECTION SET-UP AND RELEASE DELAYS 1 Introduction The communications function of “connection establishment” is influenced by how quickly end-to-end connections are implemented and how quickly the network components are returned to a ready to serve state. It is to be noted that this Recommendation considers a network provider view of service quality according to the framework given in Recommendation E.430. This Recommendation addresses service quality assessment with respect to connection set up and release delays in the public switched telephone network (PSTN), and the integrated services digital network (ISDN) as it evolves from the PSTN. Network performance design parameters from a grade of service and traffic engineering viewpoint for PSTN are given in the E.500-Series of Recommendations and for circuit switched services in the ISDN are given in Recommendation E.721. 2 Considerata The user (customer) is the primary supervisor of service quality. The user's point of view can be properly expressed by general parameters which take into account that this user is mainly interested in the end-to-end aspect of these parameters. From the network provider's point of view, the primary function of the network is to carry communications which produce revenue. To this end, the network should be properly designed and operated. Network providers do not control all aspects which influence the user perception of the general parameters and are primarily only able to influence the user perception via those network components which influence the general parameters. It should be noted that factors outside the direct control of network providers affect customer-perceived connection set-up delays. These factors, which are related to customer equipment and behaviour, may produce significant variations in connection set-up delays. They include, but are not limited to: – automatic dialling devices; – telephones that use either pulse or tone dialling; – PABXs. From the technical point of view, the three cases below are considered: i) voice service in the PSTN; ii) non-voice services in the PSTN; iii) voice and non-voice services in the ISDN as it evolves from the PSTN. The concepts forming the basis for the traditional telephone service parameters given in this Recommendation, can be extended to include other network and service combinations. Recommendation E.431 1 3 Definitions1) start dial signal delay (SDSD) Time interval between off-hook and reception of start dial signal. post dialling delay (PDD) Time interval between the end of user or terminal equipment dialling and the reception of the appropriate network response. call clearing delay (CCD) Time interval between the clearance signal from the end users, and the networks return to ready to serve state. 4 Service and networks factors affecting delay measurements It should be noted that customer’s perception of start dial signal delay, post dialling delay and call clearing delay are affected more by variations rather than by absolute values. These delays will also be influenced by the customer and/or customer provided equipment behaviour, or the types of networks that

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