ITU-T E 528-1996 DIMENSIONING OF DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) SYSTEMS《数字电路倍增设备(DCME)系统的容量设计 电话网络和综合业务服务网(ISDN)服务质量 网络管理》.pdf
《ITU-T E 528-1996 DIMENSIONING OF DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) SYSTEMS《数字电路倍增设备(DCME)系统的容量设计 电话网络和综合业务服务网(ISDN)服务质量 网络管理》.pdf》由会员分享,可在线阅读,更多相关《ITU-T E 528-1996 DIMENSIONING OF DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) SYSTEMS《数字电路倍增设备(DCME)系统的容量设计 电话网络和综合业务服务网(ISDN)服务质量 网络管理》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.528 (02/96) TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING DIMENSIONING OF DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) SYSTEMS ITU-T Recommendation E.528 (Prev
2、iously “CCITT Recommendation” FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to st
3、andardizing 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 approval of Recommendations
4、by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation ES28 was prepared by ITU-T Study Group 2 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 19th of February 1996. NOTE In this Rec
5、ommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1996 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
6、 including photocopying and microfilm, without permission in writing from the ITU. STDmITU-T RECMN E.528-ENGL 177b m qBb2591 Ob23287 177 m CONTENTS 1 Scope 2 References 3 Definitions 4 Abbreviations . 5 Dimensioning elements Determining Quality of Service (QOS) and Grade of Service (GOS) parameters
7、. General principles of dimensioning method . Parameters relevant to dimensioning calculations 5.3.1 General parameters . ADPCM mode for low rate encoding . DCME gain for Voice G, . 5.1 5.2 5.3 5.3.2 5.3.3 Digital speech interpolation 5.4 DCME gain determination (in accordance with Recommendation G.
8、766) 5.4.1 Method for dimensioning of DCME links and gain computation Determination of the number of DCME links 7.1 Determination of blocking probabilities for point-to-point DCME links . Annex A Effects of specially chosen parameters on DCME dimensioning . 6 7 7.2 Multiple system configuration A .
9、1 A.2 An example of DCME dimensioning calculation . Annex B . Appendix I . 1.1 1.3 1.4 Dynamic Load Control (DLC) functionality 1.2 Maximum achievable G, Maximum allowable percentage of VBD calls . Determination of the blocking probabilities for dimensioning of point-to-point links that include DCME
10、 . 1.4.1 DLC activation and deactivation . 1.4.2 Bearer channel loading conditions References . Appendix II Page 1 1 2 2 3 3 3 3 3 4 4 4 4 5 5 5 6 6 6 10 12 12 12 12 13 13 13 14 14 15 Recommendation ES28 (02/96) i STD*ITU-T RECMN E-528-ENGL L77b 48b259L Ob23270 797 M SUMMARY Digital Circuit Multipli
11、cation Equipment (DCME) allows a high degree of utilization of digital circuits in Public Switched Telephone Networks (PSTN) and Integrated Services Digital Networks (ISDN) providing integration of traffic containing voice, Voice Band Data (VBD) and the facsimile portion of Voice Band Data (VBD) tra
12、ffic. Dimensioning method for DCME system, described in this Recommendation, deals with a group of trunks (circuit group, as defined in Recommendation E.600) between two switches, where DCMEs are used to achieve a statistical multiplexing gain. This Recommendation also describes the GOS parameters t
13、hat play a part in the DCME gain calculation. This Recommendation deals with a point-to-point DCME single clique operation configuration. Dimensioning of complex multiclique/multidestination types of DCME systems is for further study. 11 Recommendation ES28 (OZ96) Recommendation ES28 DIMENSIONING OF
14、 DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) SYSTEMS (Geneva, 1996) 1 Scope Digital Circuit Multiplication Equipment (DCME) allows a high degree of utilization of digital circuits in hblic Switched Telephone Networks (PSTN) and Integrated Services Digital Networks (ISDN) providing integration of
15、 traffic containing voice, Voice Band Data (VBD) and the facsimile portion of Voice Band Data (VBD) traffic. Dimensioning method for DCME system, described in this Recommendation, deals with a group of trunks (circuit group, as defined in Recommendation E.600) between two switches, where DCMEs are u
16、sed to achieve a statistical multiplexing gain. The purpose of the dimensioning method is to determine the size of the group of trunks, the number and properties of the DCME output (bearer) channels and the number of DCMEs for specific traffic mixes - voice, VBD and facsimile to provide a satisfacto
17、ry Grade of Service (GOS) cost-effectively. Further, this Recommendation also describes the GOS parameters that play a part in the DCME gain calculation. The DCME gain is described in this Recommendation as a ratio of a number of trunk channels to a number of available bearer channels and is used to
18、 determine availability and specific properties of the DCME bearer channels. This Recommendation deals with a point-to-point DCME single clique operation configuration. Dimensioning of complex multicliquelmultidestination types of DCME systems is for further study. 2 References The following Recomme
19、ndations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision: all users of this Recommendation are
20、therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. - CCIT Recommendation G.766 (1992), Facsimile demodulatiodremodulation for dig
21、ital circuit multiplication equipment. - IT-T Recommendation G.763 (1994), Digital circuit multiplication equipment using ADPCM (Recommendation G. 726) and digital speech interpolation. - CCITT Recommendation G.726 (1990), 40/32/24/16 kbitls Adaptive Differential Pulse Code Modulation (ADPCM). - ITU
22、-T Recommendation E.301 (1993), Impact of non-voice applications on the telephone network. - CCITT Recommendation ES20 (1988), Number of circuits to be provided in automatic ador semi- automatic operation, without ovelflow facilities. - CCITT Recommendation E.721 (1991), Network grade of service par
23、ameters and target values for circuit-switched services in the evolving ISDN. - ITU-T Recommendation P.84 (1993), Subjective listening test method for evaluating digital circuit multiplication and packeted voice systems. - ITU-T Recommendation Q.50 (1993), Signalling between Circuit Multiplication E
24、quipment (CME) and International Switching Centres (ISC). Recommendation ES28 (OY96) 1 STD-ITU-T RECMN E.528-ENGL l97b q8b257L Ob23272 7bl 3 Definitions The following terms and definitions applicable to DCME are described in clause 21G.763. Definitions relating to DCME: These definitions are used th
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