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.994.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 6 (08/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Handshak
2、e procedures for digital subscriber line transceivers Amendment 6 Codepoints for the support of ITU-T G.993.2 profile 35b Recommendation ITU-T G.994.1 (2012) Amendment 6 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AN
3、D CIRCUITS G.100G.199 GENERAL CHARACTERISTICS 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 SATELLI
4、TE LINKS AND INTERCONNECTION WITH METALLIC 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.900
5、G.999 General G.900G.909 Parameters for 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 transmissio
6、n bearers G.940G.949 Digital line systems 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.999 MULTIMEDIA Q
7、UALITY OF SERVICE AND PERFORMANCE GENERIC 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 IT
8、U-T Recommendations. Rec. ITU-T G.994.1 (2012)/Amd.6 (08/2015) i Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers Amendment 6 Codepoints for the support of ITU-T G.993.2 profile 35b Summary Amendment 6 to Recommendation ITU-T G.994.1 (2012) includes: The cod
9、epoints for the support of ITU-T G.993.2 Annex Q (profile 35b). History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.994.1 1999-07-02 15 11.1002/1000/4720 1.1 ITU-T G.994.1 (1999) Cor. 1 2000-04-04 15 11.1002/1000/5139 2.0 ITU-T G.994.1 2001-02-09 15 11.1002/1000/5364 3.0 ITU-T
10、 G.994.1 2002-07-29 15 11.1002/1000/6119 4.0 ITU-T G.994.1 2003-05-22 15 11.1002/1000/6281 4.1 ITU-T G.994.1 (2003) Amd. 1 2004-02-22 15 11.1002/1000/7080 4.2 ITU-T G.994.1 (2003) Amd. 2 2004-06-13 15 11.1002/1000/7351 4.3 ITU-T G.994.1 (2003) Amd. 3 2005-01-13 15 11.1002/1000/7495 4.4 ITU-T G.994.1
11、 (2003) Amd. 4 2006-01-13 15 11.1002/1000/8549 5.0 ITU-T G.994.1 2007-02-13 15 11.1002/1000/8993 5.1 ITU-T G.994.1 (2007) Amd. 1 2007-11-22 15 11.1002/1000/9167 5.2 ITU-T G.994.1 (2007) Amd. 2 2008-04-13 15 11.1002/1000/9388 5.3 ITU-T G.994.1 (2007) Amd. 3 2009-03-22 15 11.1002/1000/9675 5.4 ITU-T G
12、.994.1 (2007) Amd. 4 2009-06-29 15 11.1002/1000/9891 5.5 ITU-T G.994.1 (2007) Amd. 5 2010-04-22 15 11.1002/1000/10415 5.6 ITU-T G.994.1 (2007) Amd. 6 2010-11-29 15 11.1002/1000/11018 5.7 ITU-T G.994.1 (2007) Amd. 7 2011-04-13 15 11.1002/1000/11129 5.8 ITU-T G.994.1 (2007) Cor. 1 2011-10-29 15 11.100
13、2/1000/11417 5.9 ITU-T G.994.1 (2007) Amd. 8 2011-12-16 15 11.1002/1000/11416 6.0 ITU-T G.994.1 2012-06-13 15 11.1002/1000/11644 6.1 ITU-T G.994.1 (2012) Amd. 1 2012-10-29 15 11.1002/1000/11797 6.2 ITU-T G.994.1 (2012) Amd. 2 2013-08-29 15 11.1002/1000/11994 6.3 ITU-T G.994.1 (2012) Amd. 3 2014-01-1
14、3 15 11.1002/1000/12093 6.4 ITU-T G.994.1 (2012) Amd. 4 2014-12-05 15 11.1002/1000/12094 6.5 ITU-T G.994.1 (2012) Amd. 5 2015-02-13 15 11.1002/1000/12373 6.6 ITU-T G.994.1 (2012) Amd. 6 2015-08-29 15 11.1002/1000/12564 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the addre
15、ss field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.994.1 (2012)/Amd.6 (08/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommuni
16、cations, 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 telecommunica
17、tions 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 procedure
18、 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 telecommu
19、nication 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 these
20、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 RIGHTSITU dra
21、ws 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 members o
22、r 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 represe
23、nt the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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.994.1 (2012)/
24、Amd.6 (08/2015) 1 Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers Amendment 6 Codepoints for the support of ITU-T G.993.2 profile 35b 1) Clause 2, References Update the following reference as shown: ITU-T G.993.2 Recommendation ITU-T G.993.2 (20062015), Ver
25、y high speed digital subscriber line transceivers 2 (VDSL2). 2) Codepoints for the support of G.993.2 Annex Q (Profile 35b) Modify Table 11.68.1.1 as follows: Table 11.68.1.1 Standard information field ITU-T G.993.2 profiles NPar(3) coding Octet 2 Bits ITU-T G.993.2 profiles NPar(3)s Octet 2 8 7 6 5
26、 4 3 2 1 x x x x x x x 1 Profile 17a x x x x x x 1 x Profile 30a x x x x x 1 x x Reserved for allocation by ITU-TProfile 35b x x x x 1 x x x Reserved for allocation by ITU-T x x x 1 x x x x Reserved for allocation by ITU-T x x 1 x x x x x Reserved for allocation by ITU-T x x 0 0 0 0 0 0 No parameter
27、s in this octet Modify Table 11.68.5 as follows: Table 11.68.5 Standard information field ITU-T G.993.2 initial IDFT size NPar(3) coding Bits ITU-T G.993.2 initial IDFT size NPar(3)s 8 7 6 5 4 3 2 1 x x x x x x IDFT size 2N = 2n (n = 6 to 13, bits 4 to 1) x x 1 Reserved for allocation by ITU-TExtend
28、ed IDFT size with profile 35b x x 1 Reserved for allocation by ITU-T x x 0 0 0 0 0 0 No parameters in this octet Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telep
29、hone 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 network Series J Cable networks and transmission
30、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 outside plant Series M Telecommunication managemen
31、t, 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 methods Series Q Switching and signalling Series R Telegraph tra
32、nsmission 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
