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 7 (06/2016) 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 7 Recommendation ITU-T G.994.1 (2012) Amendment 7 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO
3、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 LINES G.400G.
4、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 optical fibre ca
5、ble 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.950G.959 Dig
6、ital 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 USER-RELAT
7、ED 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 (2012)/Amd.7 (06
8、/2016) i Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers : Amendment 7 Summary Amendment 7 to Recommendation ITU-T G.994.1 (2012) includes: New codepoints for the support of extended timeout of ITU-T G.9701 initialization. New codepoints for the support of
9、the ITU-T G.9701 profile 106b. 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 G.994.1 2002-07-29 15 11.1002/10
10、00/6119 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 (2003) Amd. 4 2006-01-13 15 11.1
11、002/1000/8549 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.994.1 (2007) Amd. 4 2009-06-29 1
12、5 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 11.1002/1000/11417 5.9 ITU-T G.994.1 (2
13、007) 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 2014-01-13 15 11.1002/1000/12093 6.4 ITU-T
14、 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 6.7 ITU-T G.994.1 (2012) Amd. 7 2016-06-13 15 11.1002/1000/12797 * To access the Recommendation, type the URL http
15、:/handle.itu.int/ in the address 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.7 (06/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agen
16、cy 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 questions and issuing Recommendations on them with a view
17、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 Recommendations on these topics. The approval of ITU-T Recommendatio
18、ns 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 Recommendation, the expression “Administration“ is used for concisenes
19、s 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., interoperability or applicability) and compliance with the Recommendation
20、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 compliance with the Recommendation is required of any party. INTEL
21、LECTUAL PROPERTY RIGHTSITU 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, whe
22、ther 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 implement this Recommendation. However, implementers are cauti
23、oned 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 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of I
24、TU. Rec. ITU-T G.994.1 (2012)/Amd.7 (06/2016) 1 Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers: Amendment 7 1) Support of extended timeouts of ITU-T G.9701 initialization 1.1) Clause 9.4.35, Table 11.70.0.2 Modify Table 11.70.0.2 as follows: Table 11.70.0.
25、2 Standard information field ITU-T G.9701 SPar(2) coding Octet 3 Bits ITU-T G.9701 SPar(2)s Octet 32 8 7 6 5 4 3 2 1 x x x x x x x 1 Number of DS initialization data symbols (sds) x x x x x x 1 x Downstream RMC offset x x x x x 1 x x CD timeoutReserved for allocation by ITU-T x x x x 1 x x x Reserve
26、d 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 parameters in this octet 1.2) Clause 9.4.35, Table 11.70.15 Add Table 11.70.15: Table 11.70.15 Standard information field ITU-T G.9701 CD timeout NPar(3) cod
27、ing Octet 1 Bits ITU-T G.9701 CD timeout NPar(3)s Octet 1 8 7 6 5 4 3 2 1 x x x x x x x x CD timeout 1 (bits 3 to 1) x x x x x x x x CD timeout 2 (bits 6 to 4) 2) Add codepoint for the support for ITU-T G.9701 profile 106b 2.1) Clause 9.4.35, Table 11.70.1 Modify Table 11.70.1 as follows: 2 Rec. ITU
28、-T G.994.1 (2012)/Amd.7 (06/2016) Table 11.70.1 Standard information field ITU-T G.9701 profiles NPar(3) coding Octet 1 Bits ITU-T G.9701 profiles NPar(3)s Octet 1 8 7 6 5 4 3 2 1 x x x x x x x 1 Profile 106a-MHz x x x x x x 1 x Profile 212a-MHz x x x x x 1 x x Reserved for allocation by ITU-TProfil
29、e 106b 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 parameters in this octet Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work
30、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 and media, digital systems and networks Series H Audiovisual and multimedia systems S
31、eries 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 Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protecti
32、on 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 and subjective and
33、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, Internet of Things and smart cities Series Z Languages and general software aspects for telecommunication systems
