1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.993.5 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1 (11/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Self-F
2、EXT cancellation (vectoring) for use with VDSL2 transceivers Corrigendum 1 Recommendation ITU-T G.993.5 (2015) Corrigendum 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS
3、 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 LI
4、NES 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 optic
5、al 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.9
6、50G.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.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND
7、 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.993.5 (2015
8、)/Cor.1 (11/2016) i Recommendation ITU-T G.993.5 Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers Corrigendum 1 Summary Corrigendum 1 to Recommendation ITU-T G.993.5 (2015) covers the following functionality: 1) Typographical correction in clause 8.2 (corrigendum) 2) Generalization
9、 of the segmentation of SOC messages in clause 10.4.2.2 for vectoring of profile 35b (corrigendum). History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.993.5 2010-04-22 15 11.1002/1000/10414 1.1 ITU-T G.993.5 (2010) Cor. 1 2011-06-22 15 11.1002/1000/11128 1.2 ITU-T G.993.5 (20
10、10) Amd. 1 2011-12-16 15 11.1002/1000/11396 1.3 ITU-T G.993.5 (2010) Cor. 2 2012-06-13 15 11.1002/1000/11643 1.4 ITU-T G.993.5 (2010) Amd. 2 2012-10-29 15 11.1002/1000/11796 1.5 ITU-T G.993.5 (2010) Amd. 3 2013-04-22 15 11.1002/1000/11889 1.6 ITU-T G.993.5 (2010) Amd. 4 2013-08-29 15 11.1002/1000/11
11、993 1.7 ITU-T G.993.5 (2010) Amd. 5 2014-04-04 15 11.1002/1000/12095 2.0 ITU-T G.993.5 2015-01-13 15 11.1002/1000/12372 2.1 ITU-T G.993.5 (2015) Cor. 1 2016-11-13 15 11.1002/1000/13089 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, foll
12、owed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.993.5 (2015)/Cor.1 (11/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communica
13、tion 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 telecommunications on a worldwide basis. The Wo
14、rld 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 procedure laid down in WTSA Resolution 1. I
15、n 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 telecommunication administration and a reco
16、gnized 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 these mandatory provisions are met. The
17、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 RIGHTSITU draws attention to the possibility th
18、at 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 members or others outside of the Recommenda
19、tion 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 represent the latest information and are
20、therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 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.993.5 (2015)/Cor.1 (11/2016) 1 Recommendation I
21、TU-T G.993.5 Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers Corrigendum 1 1) Typographical correction in clause 8.2 Typographical correction in clause 8.2 as follows: 8.2 Pilot sequence update command and response The third octet of the pilot sequence update command defines the t
22、ime at which the upstream pilot sequence change shall occur: If interruption of the current upstream pilot sequence is not allowed (value 01160116), the upstream pilot sequence change shall be applied starting from the next sync symbol position after the end of the current upstream pilot sequence, i
23、.e., after the sync symbol that modulates the last bit of the old upstream pilot sequence, the next sync symbol shall modulate the first bit of the new upstream pilot sequence. If interruption of the current upstream pilot sequence is allowed (value 02160216), the upstream pilot sequence change may
24、occur at any sync symbol position, i.e., after the sync symbol that modulates bit i of old upstream pilot sequence, the next sync symbol shall modulate bit i+1 of the new upstream pilot sequence. 2) Generalization of the segmentation of SOC messages for vectoring of profile 35b Update clause 10.4.2.
25、2 as follows: 10.4.2.2 R-ERROR-FEEDBACK The number of bytes used to report the clipped error samples in a single R-ERROR-FEEDBACK message depends on the backchannel control parameters indicated in the O-TA_UPDATE message. The total number of bytes to be transmitted is equal to the number of bytes in
26、 the ERB, N_ERB, plus 3 (see Table 10-14). If the size of the R-ERROR_FEEDBACK message is larger than the maximum allowed segment size1024 bytes, the message shall be segmented as defined in clause 12.2.6 of ITU-T G.993.2 for AR mode, with the number of segments not to exceed 1615. All segments exce
27、pt the last one shall be set to be of the maximum allowed segment size of 1024 bytes. Printed in Switzerland Geneva, 2017 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D Tariff and accounting principles and international telecommunication/ICT economic and policy i
28、ssues 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 Series H Audiovisual and multimedia systems Series I Integrated services digital ne
29、twork Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of out
30、side 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 Telephone transmission quality, telephone installations, local line
31、 networks Series Q Switching and signalling, and associated measurements and tests 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, next-generation networks, Internet of Things and smart cities Series Z Languages and general software aspects for telecommunication systems
