ITU-T O 173-2007 Jitter measuring equipment for digital systems which are based on the Optical Transport Network (OTN) SERIES O SPECIFICATIONS OF MEASURING EQUIPMENT Equipment for al .pdf
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1、 International Telecommunication Union ITU-T O.173TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2007) SERIES O: SPECIFICATIONS OF MEASURING EQUIPMENT Equipment for the measurement of digital and analogue/digital parameters Jitter measuring equipment for digital systems which are based on the O
2、ptical Transport Network (OTN) ITU-T Recommendation O.173 ITU-T O-SERIES RECOMMENDATIONS SPECIFICATIONS OF MEASURING EQUIPMENT General O.1O.9 Maintenance access O.10O.19 Automatic and semi-automatic measuring systems O.20O.39 Equipment for the measurement of analogue parameters O.40O.129 Equipment f
3、or the measurement of digital and analogue/digital parameters O.130O.199 Equipment for the measurement of optical channel parameters O.200O.209 Equipment to perform measurements on IP networks O.210O.219 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. O.173 (03/200
4、7) i ITU-T Recommendation O.173 Jitter measuring equipment for digital systems which are based on the Optical Transport Network (OTN) Summary This Recommendation specifies instrumentation that is used to generate and measure jitter in digital systems based on the OTN. Measurement requirements for cl
5、ient interfaces, e.g., SDH line interfaces are not addressed in this Recommendation. The requirements for the characteristics of the jitter measuring equipment that are specified in this Recommendation must be adhered to in order to ensure consistency of results between equipment produced by differe
6、nt manufacturers. Source ITU-T Recommendation O.173 was approved on 16 March 2007 by ITU-T Study Group 4 (2005-2008) under the ITU-T Recommendation A.8 procedure. Keywords Input jitter tolerance, input wander tolerance, jitter generation, jitter measurement, jitter transfer function, output jitter.
7、ii ITU-T Rec. O.173 (03/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, opera
8、ting and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, pr
9、oduce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some 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 t
10、his Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. in
11、teroperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest
12、 that compliance with the Recommendation is required of any party. 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 evidenc
13、e, validity or applicability of claimed Intellectual 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
14、be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be r
15、eproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. O.173 (03/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Functional block diagram . 2 6 Interfaces. 3 6.1 Optical interfaces 3 6.2 Electrical interfaces 3 6
16、.3 External reference clock input 3 6.4 Input interface sensitivity . 3 7 Jitter generation function 3 7.1 Modulation source 4 7.2 Clock generator 4 7.3 Digital test pattern generator 4 7.4 Minimum jitter generation capability. 4 7.5 Generation accuracy . 5 8 Jitter measurement function 6 8.1 Refere
17、nce timing signal 6 8.2 Measurement capabilities . 6 8.3 Measurement bandwidths. 7 8.4 Measurement accuracy . 8 8.5 Analogue output . 10 8.6 Jitter transfer measurement accuracy . 10 9 Operating environment . 10 Annex A OTUk test signals for jitter measurement 11 A.1 Introduction 11 A.2 Test signal
18、structure for OTN signals. 11 iv ITU-T Rec. O.173 (03/2007) Introduction The timing performance of OTN networks and OTN equipment elements is specified in ITU-T G.8251, using jitter and wander parameters. This Recommendation specifies the various characteristics of jitter measuring equipment, which
19、are needed in order to support the requirements of ITU-T G.8251 and to perform other test and measuring tasks. While functional and characteristic requirements are given for the measuring equipment, the realization of the equipment configuration is not covered and should be given careful considerati
20、on by the designer and user. In particular, it is not required that all features described in this Recommendation shall be provided in one piece of equipment. Users may select those functions, which correspond best to their applications. ITU-T Rec. O.173 (03/2007) 1 ITU-T Recommendation O.173 Jitter
21、 measuring equipment for digital systems which are based on the Optical Transport Network (OTN) 1 Scope This Recommendation specifies test instrumentation that is used to generate and measure timing jitter in digital systems based on the Optical Transport Network (OTN). The test instrumentation cons
22、ists principally of a jitter measurement function and a jitter generation function. Measurements can be performed at the physical layer of OTN network node interfaces (NNIs). A bit error rate test set may also be required for certain types of measurements; this may be part of the same instrumentatio
23、n or it may be physically separate. It is recommended that ITU-T G.8251 and ITU-T G.709 be read in conjunction with this Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recom
24、mendation. At the time of publication, 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 refere
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