1、 International Telecommunication Union ITU-T O.174TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(07/2010) SERIES O: SPECIFICATIONS OF MEASURING EQUIPMENT Equipment for the measurement of digital and analogue/digital parameters Jitter and wander measuring equipment for digital systems
2、which are based on synchronous Ethernet technology Corrigendum 1 Recommendation ITU-T O.174 (2009) Corrigendum 1 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 m
3、easurement 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 perform measurements on IP networks O.210O.219 Equipment to perform measurements on lease
4、d-circuit services O.220O.229 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T O.174 (2009)/Cor.1 (07/2010) i Recommendation ITU-T O.174 Jitter and wander measuring equipment for digital systems which are based on synchronous Ethernet technology Corrigendum 1 Summar
5、y Corrigendum 1 to Recommendation ITU-T O.174 contains material to correct Recommendation ITU-T O.174, Jitter and wander measuring equipment for digital systems which are based on synchronous Ethernet technology. History Edition Recommendation Approval Study Group 1.0 ITU-T O.174 2009-11-13 15 1.1 I
6、TU-T O.174 (2009) Cor. 1 2010-07-29 15 ii Rec. ITU-T O.174 (2009)/Cor.1 (07/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standar
7、dization 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 Telecommunication Standardization Assembly (WTSA), whic
8、h 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 some areas of information technology which fall within IT
9、U-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 recognized operating agency. Compliance with this Recommendatio
10、n is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g., interoperability 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 “mus
11、t“ and the negative equivalents are used to express requirements. The use of such words does not suggest 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 ma
12、y involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, 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 thi
13、s Recommendation, ITU had not received notice of intellectual property, protected by patents, which may 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 data
14、base at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T O.174 (2009)/Cor.1 (07/2010) 1 Recommendation ITU-T O.174 Jitter and wander measuring equipment for digi
15、tal systems which are based on synchronous Ethernet technology Corrigendum 1 Clause 8.4.1, Minimum sinusoidal jitter/wander generation capability Replace Figure 2 with the following: Signal Minimum peak-to-peak jitter amplitude (s) Wander frequency breakpoints (Hz) A0A1A2f5f4f3f2f1f0EEC 23.15 2.57 0
16、.32 12 178 1.6 m 15.6 m 125 m 10 NOTE 1 Values based on requirements of ITU-T G.8262. NOTE 2 Jitter value is for further study. Figure 2 Minimum amplitude of adjustable generated sinusoidal wander amplitude versus wander frequency for EEC signals Peak-to-peak Wander amplitude (log scale) Frequency (
17、log scale)A0 A1A2 f4 f3 f2 f1 f0 f5 Printed in Switzerland Geneva, 2010 SERIES OF ITU-T RECOMMENDATIONS 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 tele
18、communication services Series G Transmission systems and media, digital systems and networks Series 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 Protecti
19、on against interference Series L Construction, installation and protection of cables and other 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 Spec
20、ifications of measuring equipment Series P Terminals and subjective and objective assessment methods 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
