1、 International Telecommunication Union ITU-T G.992.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 3(08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Asymmetric digital subscriber line trans
2、ceivers 2 (ADSL2) Corrigendum 3: Accuracy of test parameters (clarification) Recommendation ITU-T G.992.3 (2009) Corrigendum 3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTI
3、CS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC
4、LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Parameters for opt
5、ical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Digital line systems G
6、.950G.959 Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Metallic access networks G.990G.999MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AN
7、D USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.992.3 (200
8、9)/Cor.3 (08/2013) i Recommendation ITU-T G.992.3 Asymmetric digital subscriber line transceivers 2 (ADSL2) Corrigendum 3 Accuracy of test parameters (clarification) Summary Corrigendum 3 to Recommendation ITU-T G.992.3 (2009) covers the following functionality: 1. Accuracy of test parameters (clari
9、fication). History Edition Recommendation Approval Study Group 1.0 ITU-T G.992.3 2002-07-29 15 1.1 ITU-T G.992.3 (2002) Amd. 1 2003-05-22 15 1.2 ITU-T G.992.3 (2002) Cor. 1 2003-12-14 15 1.3 ITU-T G.992.3 (2002) Cor. 2 2004-02-22 15 1.4 ITU-T G.992.3 (2002) Amd. 2 2004-04-30 15 1.5 ITU-T G.992.3 (20
10、02) Amd. 3 2004-06-13 15 1.6 ITU-T G.992.3 (2002) Amd. 4 2004-06-13 15 2.0 ITU-T G.992.3 2005-01-13 15 2.1 ITU-T G.992.3 (2005) Amd. 1 2005-09-22 15 2.2 ITU-T G.992.3 (2005) Amd. 2 2006-03-29 15 2.3 ITU-T G.992.3 (2005) Amd. 3 2006-12-14 15 2.4 ITU-T G.992.3 (2005) Amd. 4 2007-07-29 15 2.5 ITU-T G.9
11、92.3 (2005) Amd. 5 2008-06-22 15 3.0 ITU-T G.992.3 2009-04-22 15 3.1 ITU-T G.992.3 (2009) Cor. 1 2009-11-13 15 3.2 ITU-T G.992.3 (2009) Amd. 1 2010-03-01 15 3.3 ITU-T G.992.3 (2009) Amd. 2 2010-07-29 15 3.4 ITU-T G.992.3 (2009) Amd. 3 2010-11-29 15 3.5 ITU-T G.992.3 (2009) Cor. 2 2011-06-22 15 3.6 I
12、TU-T G.992.3 (2009) Amd. 4 2011-10-29 15 3.7 ITU-T G.992.3 (2009) Amd. 5 2012-10-29 15 3.8 ITU-T G.992.3 (2009) Cor. 3 2013-08-29 15 ii Rec. ITU-T G.992.3 (2009)/Cor.3 (08/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecomm
13、unications, 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 and issuing Recommendations on them with a view to standardizing telecommun
14、ications 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 these topics. The approval of ITU-T Recommendations is covered by the proced
15、ure 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 expression “Administration“ is used for conciseness to indicate both a teleco
16、mmunication 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 applicability) and compliance with the Recommendation is achieved when all of the
17、se 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 Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU
18、 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 Intellectual Property Rights, whether asserted by ITU membe
19、rs or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not rep
20、resent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 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 G.992.3 (20
21、09)/Cor.3 (08/2013) 1 Recommendation ITU-T G.992.3 Asymmetric digital subscriber line transceivers 2 (ADSL2) Corrigendum 3 Accuracy of test parameters (clarification) Amend clause 8.12.5 as follows: 8.12.5 Accuracy of test parameters This clause defines accuracy requirements for test parameters defi
22、ned in clause 8.12.3. The accuracy requirements are expressed as a tolerance relative to a reference value. Both the reference value and the allowed tolerance are defined in this clause. The accuracy requirements of test parameters are optional. An ATU may comply with the accuracy requirements for a
23、ll or a subset of the test parameters. For subcarriers and subcarrier groups to which accuracy requirements do not apply (see clauses 8.12.5.1 to 8.12.5.8), the ATU shall report test parameters as defined in clause 8.12.3 but the accuracy of these reported values may not comply with accuracy require
24、ments further defined in this clause. NOTE The measurement of test parameter reference values involves the use of test equipment. The accuracy requirements defined in this clause do not take into account test equipment tolerance. Test equipment tolerance is out of the scope of this Recommendation an
25、d is to be added to the tolerances defined in this clause. Printed in Switzerland Geneva, 2013 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 Seri
26、es F Non-telephone telecommunication 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 si
27、gnals Series K Protection 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
28、 circuits Series O Specifications 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 sw
29、itching 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
