ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp

pdf标准 ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp

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ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp 第 1 页 ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp 第 2 页 ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp 第 3 页 ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp 第 4 页 ITU-T E.434-1992 公共交换电话网(PSTN)用户到用户的测量 Subscriber-to-Subscriber Measurement of Public Switched Telephone Network (Study Group II) 11 pp 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,公共,交换,电话,电话网,pstn,用户,用户,测量,subscriber,to,subscriber,measurement,of,public,switched,telephone,network,study,group,ii,pp

INTERNATIONAL TELECOMMUNICATION UNION CCITT E.434 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING SUBSCRIBER-TO-SUBSCRIBER MEASUREMENT OF PUBLIC SWITCHED TELEPHONE NETWORK Recommendation E.434 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.434 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 16th of June 1992. ___________________ CCITT NOTES 1) In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. 2) A list of abbreviations used in this Recommendation can be found in Annex A. © 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.434 Recommendation E.434 SUBSCRIBER-TO-SUBSCRIBER MEASUREMENT OF THE PUBLIC SWITCHED TELEPHONE NETWORK 1 Introduction Subscriber-to-subscriber These measurements are taken: 1) service quality measurements are taken end-to-end as defined in Figure 1/E.434. – to relate network quality to customer’ expectations which are based upon previous experience with the network; – to ensure that objective measures are made of the network; – to ensure that acceptable thresholds of quality are being met; – to ensure that regulatory requirements are met; – to ensure that the distant correspondent’s level of quality meets other network providers’ needs. To assess the network service quality requires the collection of the following: – end-to-end network measurements results; – customer perception of network quality. Related publications in this area are Recommendations E.424, E.431, E.433, E.435 and M.1235 and the Hand Book on Quality of Service and network performance: Annex E, E-series Reommendations which include numerical objectives to be published in 1992). CTE LE TE ISC IN ISC End-to-end path LE TE CTE ISC IN TE LE CTE T0203060-92 Local exchange Transit exchange Customer’s terminating equipment International switching centre International network FIGURE 1/E.434 Reference diagram for end-to-end measurements 2 Scope The aim of this Recommendation is to define end-to-end measurements of the public switched telephone network (PSTN), detailing: – the methods and processes for testing; – the measurements required; _______________ 1) Subscriber-to-subscriber type test calls are defined in Recommendation E.424. Recommendation E.434 1 – elements of an end-to-end system; – the operation of an end-to-end system, with recommendations to define interfaces and protocols. 3 Methodology 3.1 End-to-end network measurements/results To obtain a duplication of the subscriber-to-subscriber connection, the measurement must replicate the total end-to-end connection. Test calls are required to be generated for the assessment of the network between subscriber terminals. The results will be used to assess four areas of performance monitoring: – – connection retainability; – transmission quality after connection is established; – 3.2 connection setup/release; billing integrity. Customer perception of network quality There are various methods to evaluate the customers perception of the network quality; market surveys (interviews), operator keyed trouble reports (OKTR), service observations and customer complaints. This subjective data can be correlated with the subscriber-to-subscriber measurements. In this manner the objective measures can either support the customers’ perception or require further investigation by the network provider when the customers’ perception does not agree with the objective data. 4 A typical end-to-end test call system An end-to-end test call system would typically consist of three elements: – test call controler, – test call transponder, – test call responder. This is shown in diagrammatic form in Figure 2/E.434. Network I1 I1 Tr

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