ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp

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ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp 第 1 页 ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp 第 2 页 ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp 第 3 页 ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp 第 4 页 ITU-T E.731-1992 电路交换模式运营资源容量设计方法 METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (Study Group II) 13 pp 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,电路,交换,模式,运营,资源,容量,设计,方法,methods,for,dimensioning,resources,operating,in,circuit,switched,mode,study,group,ii,pp

INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE E.731 (10/92) TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE Recommendation E.731 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.731 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 30th of October 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 1993 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. PAGE BLANCHE Recommendation E.731 Recommendation E.731 (10/92) METHODS FOR DIMENSIONING RESOURCES OPERATING IN CIRCUIT SWITCHED MODE (1992) 1 Introduction This Recommendation provides methods for dimensioning resources operating in circuit switched mode in the ISDN. It proposes the use of traditional telephone dimensioning methods complemented with specific techniques that should be used for those ISDN issues that are widely at variance with the traditional telephone traffic models. Techniques for the following ISDN issues are provided: – Multi-slot connection; – Service protection methods; – Attribute negotiation; – Service reservation; – Multipoint connections. 2 Evolution of network dimensioning methods 2.1 Telephone traffic modelling All telephone network dimensioning procedures are based on mathematical models that approximate the statistical behaviour of telephone traffic in large populations. These models allow straightforward characterization of the traffic demand and network dimensioning by adopting simplifying assumptions concerning: – stationarity of the traffic process during the reference period; – call attempt inter-arrival times; – call holding times; – disposition of blocked or delayed call attempts; – dependency of call attempts and holding times from network state and other call attempts. For example, in the most commonly used Erlang loss formula, the following assumptions are used: – stationary traffic process during the reference period; – poissonian arrival of call attempts; – general distribution of call holding times; – blocked calls cleared; – independence of call attempts and holding times on network state and other call attempts. Assumptions are not actual descriptions of individual caller behaviour, but give rise to statistical patterns that have been experimentally observed to closely approximate the aggregate traffic flows in real telephone networks. The history of telephone network dimensioning can be viewed as primarily the extension of a few basic traffic models to a widening range of applications, including the development of techniques to replace situations not entirely consistent with the basic models by “equivalent” situations that permit continued application of the same techniques. Recommendation E.731 (10/92) 1 The E.520-Series Recommendations provide telephone network dimensioning methods based on traditional traffic modelling. 2.2 Impact of ISDN circuit switched mode Narrow-band ISDNs will evolve from the PSTN and the basic network structure for the circuit switched mode will be identical to that of the PSTN. However, many ISDNs will offer circuit switched services with modes of operation that are at variance with underlying assumptions of traditional telephone traffic models. For example multi-slot services require different amounts of network resources for different call attempts, an aspect that is not considered in traditional telephone traffic models. The technologies being introduced in conjunction with ISDN can result in new traffic patterns as well. For example, automatic repetition terminals coupled with fast network sig

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