ITU-T G.100 Series Supplement 29-1993 Planning of mixed analogue-digital circuits (chains, connections)

pdf标准 ITU-T G.100 Series Supplement 29-1993 Planning of mixed analogue-digital circuits (chains, connections)

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ITU-T G.100 Series Supplement 29-1993  Planning of mixed analogue-digital circuits (chains, connections)  第 1 页 ITU-T G.100 Series Supplement 29-1993  Planning of mixed analogue-digital circuits (chains, connections)  第 2 页 ITU-T G.100 Series Supplement 29-1993  Planning of mixed analogue-digital circuits (chains, connections)  第 3 页 ITU-T G.100 Series Supplement 29-1993  Planning of mixed analogue-digital circuits (chains, connections)  第 4 页 ITU-T G.100 Series Supplement 29-1993  Planning of mixed analogue-digital circuits (chains, connections)  第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION ITU-T Supplement TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 29 (Series G) (03/93) TRANSMISSION SYSTEMS AND MEDIA GENERAL CHARACTERISTICS OF INTERNATIONAL TELEPHONE CONNECTIONS AND INTERNATIONAL TELEPHONE CIRCUITS PLANNING OF MIXED ANALOGUE – DIGITAL CIRCUITS (CHAINS, CONNECTIONS) Supplement 29 to ITU-T Series G Recommendations (Previously “CCITT Recommendations”) FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T 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 World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. Supplement 29 to ITU-T Series G Recommendations was revised by the ITU-T Study Group XII (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). ___________________ NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.  ITU 1994 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. CONTENTS Supplement 29 – Series G (03/93) Page 1 General ........................................................................................................................................................... 1 2 Planning principles......................................................................................................................................... 1 3 Objectives for the mixed analogue/digital chain of 4-wire circuits................................................................ 3.4 Attenuation/frequency distortion ...................................................................................................... 3.5 Group delay distortions..................................................................................................................... 3.6 Non-linear distortions ....................................................................................................................... 3.7 Noise (total distortion)...................................................................................................................... 3.8 Impulse noise .................................................................................................................................... 3.9 Short-time interruptions, phase jitter, amplitude and phase hits....................................................... 3.10 Error performance............................................................................................................................. 2 2 3 3 4 7 7 7 References ................................................................................................................................................................. 11 Annex A – Definitions .............................................................................................................................................. 11 Appendix I – Influence of errors in digital 2048 kbit/s streams on the noise in voice-frequency mixed circuits ............................................................................................................................................................ I.1 Introduction ...................................................................................................................................... I.2 Noise power in a PCM voice-frequency circuit due to digital errors ............................................... I.3 Conclusion ..........................................................................................................................

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