1、 International Telecommunication Union ITU-T O.173TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(07/2010) SERIES O: SPECIFICATIONS OF MEASURING EQUIPMENT Equipment for the measurement of digital and analogue/digital parameters Jitter measuring equipment for digital systems which are bas
2、ed on the Optical Transport Network (OTN) Amendment 1: Correction of jitter frequency breakpoints and clarification of jitter transfer measurement accuracy Recommendation ITU-T O.173 (2007) Amendment 1 ITU-T O-SERIES RECOMMENDATIONS SPECIFICATIONS OF MEASURING EQUIPMENT General O.1O.9 Maintenance ac
3、cess O.10O.19 Automatic and semi-automatic measuring systems O.20O.39 Equipment for the measurement of analogue parameters O.40O.129 Equipment for the measurement of digital and analogue/digital parameters O.130O.199Equipment for the measurement of optical channel parameters O.200O.209 Equipment to
4、perform measurements on IP networks O.210O.219 Equipment to perform measurements on leased-circuit services O.220O.229 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T O.173 (2007)/Amd.1 (07/2010) i Recommendation ITU-T O.173 Jitter measuring equipment for digital s
5、ystems which are based on the Optical Transport Network (OTN) Amendment 1 Correction of jitter frequency breakpoints and clarification of jitter transfer measurement accuracy Summary Amendment 1 to Recommendation ITU-T O.173 contains a change of the frequency breakpoint f2for OTU3 and an additional
6、comment in the jitter transfer measurement accuracy. History Edition Recommendation Approval Study Group 1.0 ITU-T O.173 2003-03-29 4 2.0 ITU-T O.173 2007-03-16 4 2.1 ITU-T O.173 (2007) Amend. 1 2010-07-29 15 ii Rec. ITU-T O.173 (2007)/Amd.1 (07/2010) FOREWORD The International Telecommunication Uni
7、on (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions a
8、nd 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, produce Recommendations on th
9、ese 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 this Recommendation, the exp
10、ression “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., interoperability or applicab
11、ility) 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 that compliance with the
12、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 evidence, validity or applicabili
13、ty 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 be required to implement t
14、his 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 2010 All rights reserved. No part of this publication may be reproduced, by any means wh
15、atsoever, without the prior written permission of ITU. Rec. ITU-T O.173 (2007)/Amd.1 (07/2010) iii CONTENTS Page 1) Minimum amplitude for generated jitter amplitude for OTU3 . 1 2) Jitter transfer measurement accuracy 1 Rec. ITU-T O.173 (2007)/Amd.1 (07/2010) 1 Recommendation ITU-T O.173 Jitter meas
16、uring equipment for digital systems which are based on the Optical Transport Network (OTN) Amendment 1 Correction of jitter frequency breakpoints and clarification of jitter transfer measurement accuracy 1) Minimum amplitude for generated jitter amplitude for OTU3 Change the frequency breakpoint f2(
17、see underline) for OTU3 in Table 1 which is according to the modification of Table 4 of Corrigendum 2 to ITU-T G.8251: Table 1 Minimum amplitude of adjustable generated jitter amplitude versus jitter frequency for OTUk signals Signal Minimum peak-to-peak jitteramplitude (UIpp) Jitter frequency break
18、points (Hz) A1 A2 A3 f0 f1 f2 f3 f4 OTU1 20 2 0.2 500 5 k 100 k 1 M 20 M OTU2 20 2 0.2 2 k 20 k 400 k 4 M 80 M OTU3 20 8 0.2 8 k 20 k 400k 480 k 16 M 320 M 2) Jitter transfer measurement accuracy Add a comment (see underline) to clause 8.6 to explain the source of the mentioned jitter transfer param
19、eters: 8.6 Jitter transfer measurement accuracy . The total measurement error in the jitter frequency range fL= 0.01 fCand fH= 100 fCor f4, if f4is lower than 100 fCwhen using input jitter amplitude equal to the applicable jitter tolerance masks, shall be less than: 0.05 dB 0.12 g where g is the mea
20、sured jitter transfer gain at the jitter frequency fmin dB, and fL, fC, and fHare according to Table A.5 of ITU-T G.8251. This measurement error applies for g greater than or equal to 45 dB. No accuracy is specified for g less than 45 dB. . Printed in Switzerland Geneva, 2010 SERIES OF ITU-T RECOMME
21、NDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Se
22、ries H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other
23、elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment me
24、thods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
