1、 International Telecommunication Union ITU-T G.994.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Handshake procedures for digital subscribe
2、r line transceivers Amendment 2 Extended duration of new functionality O-P-VECTOR 1 Recommendation ITU-T G.994.1 (2012) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTE
3、RISTICS 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 META
4、LLIC 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 fo
5、r optical 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 syst
6、ems G.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 GENER
7、IC AND 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.994.1
8、 (2012)/Amd.2 (08/2013) i Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers Amendment 2 Extended duration of new functionality O-P-VECTOR 1 Summary Amendment 2 to Recommendation ITU-T G.994.1 (2012) covers the following code point assignments for new function
9、ality O-P-VECTOR 1: 1. New code point for the extended duration of O-P-VECTOR 1. 2. New code point for use of O-P-VECTOR 1 flag tones only. History Edition Recommendation Approval Study Group 1.0 ITU-T G.994.1 1999-07-02 15 1.1 ITU-T G.994.1 (1999) Cor. 1 2000-04-04 15 2.0 ITU-T G.994.1 2001-02-09 1
10、5 3.0 ITU-T G.994.1 2002-07-29 15 4.0 ITU-T G.994.1 2003-05-22 15 4.1 ITU-T G.994.1 (2003) Amd. 1 2004-02-22 15 4.2 ITU-T G.994.1 (2003) Amd. 2 2004-06-13 15 4.3 ITU-T G.994.1 (2003) Amd. 3 2005-01-13 15 4.4 ITU-T G.994.1 (2003) Amd. 4 2006-01-13 15 5.0 ITU-T G.994.1 2007-02-13 15 5.1 ITU-T G.994.1
11、(2007) Amd. 1 2007-11-22 15 5.2 ITU-T G.994.1 (2007) Amd. 2 2008-04-13 15 5.3 ITU-T G.994.1 (2007) Amd. 3 2009-03-22 15 5.4 ITU-T G.994.1 (2007) Amd. 4 2009-06-29 15 5.5 ITU-T G.994.1 (2007) Amd. 5 2010-04-22 15 5.6 ITU-T G.994.1 (2007) Amd. 6 2010-11-29 15 5.7 ITU-T G.994.1 (2007) Amd. 7 2011-04-13
12、 15 5.8 ITU-T G.994.1 (2007) Cor. 1 2011-10-29 15 5.9 ITU-T G.994.1 (2007) Amd. 8 2011-12-16 15 6.0 ITU-T G.994.1 2012-06-13 15 6.1 ITU-T G.994.1 (2012) Amd.1 2012-10-29 15 6.2 ITU-T G.994.1 (2012) Amd. 2 2013-08-29 15 ii Rec. ITU-T G.994.1 (2012)/Amd.2 (08/2013) FOREWORD The International Telecommu
13、nication Union (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
14、 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, produce Recommend
15、ations 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 this Recommendat
16、ion, 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., interoperabilit
17、y 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 that complia
18、nce 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 evidence, validity o
19、r 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 received notice of intellectual property, protected by patents, which may be required to im
20、plement 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 2013 All rights reserved. No part of this publication may be reproduced, by any
21、 means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.994.1 (2012)/Amd.2 (08/2013) 1 Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers Amendment 2 Extended duration of new functionality O-P-VECTOR 1 1) Extended duration of O-P-VECTOR 1
22、(new functionality) Modify Table 11.68.10 as follows: Table 11.68.10 Standard information field ITU-T G.993.2 ITU-T G.993.5 NPar(3) coding Octet 1 Bits ITU-T G.993.2 Vectoring NPar(3)s Octet 1 8 7 6 5 4 3 2 1x x x x x x x 1 Downstream vectoring x x x x x x 1 x Upstream vectoring x x x x x 1 x x Pilo
23、t sequence length multiple of 4 x x x x 1 x x x Upstream FDPS x x x 1 x x x x 8192 superframes duration for O-P-VECTOR 1Reserved for allocation by ITU-T x x 1 x x x x x Use of O-P-VECTOR 1 flag tones onlyReserved for allocation by ITU-T x x 0 0 0 0 0 0 No parameters in this octet Printed in Switzerl
24、and 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 Series F Non-telephone telecommunication services Series G Transmission systems an
25、d 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 Protection against interference Series L Construction, installa
26、tion 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 Specifications of measuring equipment Series P Terminals an
27、d 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
