ITU-T J 133-2002 Measurement of MPEG-2 transport streams in networks Series J Cable Networks and Transmission of Television Sound Programme and Other Multimedia Signals Transport o.pdf
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1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T J.133TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2002) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Transport of MPEG-2 signals on packetised networks Measurement of MPEG-2 transport streams
2、 in networks ITU-T Recommendation J.133 ITU-T J-SERIES RECOMMENDATIONS CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations J.1J.9 General specifications for analogue sound-programme transmission J.10J.19 Performance characteristics of a
3、nalogue sound-programme circuits J.20J.29 Equipment and lines used for analogue sound-programme circuits J.30J.39 Digital encoders for analogue sound-programme signals J.40J.49 Digital transmission of sound-programme signals J.50J.59 Circuits for analogue television transmission J.60J.69 Analogue te
4、levision transmission over metallic lines and interconnection with radio-relay links J.70J.79 Digital transmission of television signals J.80J.89 Ancillary digital services for television transmission J.90J.99 Operational requirements and methods for television transmission J.100J.109 Interactive sy
5、stems for digital television distribution J.110J.129 Transport of MPEG-2 signals on packetised networks J.130J.139 Measurement of the quality of service J.140J.149 Digital television distribution through local subscriber networks J.150J.159 IPCablecom J.160J.179 Miscellaneous J.180J.199 Application
6、for Interactive Digital Television J.200J.209 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. J.133 (07/2002) i ITU-T Recommendation J.133 Measurement of MPEG-2 transport streams in networks Summary MPEG-2 Transport Streams that are transmitted over any real networ
7、ks are exposed to certain effects caused by the network components which are not ideally transparent. One of the predominant effects is the acquisition of jitter in relation to the PCR values and their position in the TS. This Recommendation specifies measurements that enable determination of this j
8、itter. Source ITU-T Recommendation J.133 was prepared by ITU-T Study Group 9 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 July 2002. ii ITU-T Rec. J.133 (07/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
9、 telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. 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 T
10、elecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In som
11、e areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognize
12、d operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intelle
13、ctual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. H
14、owever, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU
15、. ITU-T Rec. J.133 (07/2002) iii CONTENTS Page 1 Scope 1 2 References. 1 2.1 Normative references 1 2.2 Informative references 1 3 Abbreviations and acronyms 1 4 System clock and PCR measurements 1 4.1 Reference model for system clock and PCR measurements 1 4.2 Measurement descriptions 3 4.3 Program
16、 Clock Reference Frequency Offset (PCR_FO) 3 4.4 Program Clock Reference Drift Rate (PCR_DR) 4 4.5 Program Clock Reference Overall Jitter (PCR_OJ) 4 4.6 Program Clock Reference Accuracy (PCR_AC) 5 Appendix I PCR-related measurements 6 I.1 Introduction 6 I.2 Limits 6 I.3 Equations 7 I.4 Mask . 8 I.5
17、Break frequencies . 9 I.6 Further implicit limitations. 10 I.7 Measurement procedures 11 I.7.1 PCR_Accuracy (PCR_AC) 13 I.7.2 PCR_drift_rate (PCR_DR). 14 I.7.3 PCR_frequency_offset (PCR_FO) . 14 I.7.4 PCR_overall_jitter measurement 15 I.8 Considerations on performing PCR measurements 15 I.9 Choice o
18、f filters in PCR measurement . 17 I.9.1 Why is there a choice? 17 I.9.2 Higher demarcation frequencies. 18 I.9.3 Lower demarcation frequencies . 18 ITU-T Rec. J.133 (07/2002) 1 ITU-T Recommendation J.133 Measurement of MPEG-2 transport streams in networks 1 Scope A MPEG-2 Transport Stream that is tr
19、ansmitted over any real network is exposed to certain effects caused by the network components which are not ideally transparent. One of the predominant effects is the acquisition of jitter in relation to the PCR values and their position in the TS. The four measurement parameters defined in the fol
20、lowing describe the various jitter components which can be differentiated by demarcation frequencies. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publicati
21、on, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the cu
22、rrently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 2.1 Normative references 1 ITU-T Recommendation H.222.0 (2000) | ISO/IEC 13818-1: 2000, Information technolo
23、gy Generic coding of moving pictures and associated audio information: Systems. 2 ETSI TR 101 290 V1.2.1 (2001), Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems. 2.2 Informative references 3 ISO/IEC 13818-9:1996, Information technology Generic coding of moving pictures and a
24、ssociated audio information Part 9: Extension for real time interface for systems decoders. 3 Abbreviations and acronyms This Recommendation uses the following abbreviation: PCR Program Clock Reference 4 System clock and PCR measurements 4.1 Reference model for system clock and PCR measurements This
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