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.997.1 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 Physic
2、al layer management for digital subscriber line transceivers Corrigendum 1 Recommendation ITU-T G.997.1 (2012) 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.997.1 (2012
8、)/Cor.1 (11/2016) i Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Corrigendum 1 Summary Corrigendum 1 to Recommendation ITU-T G.997.1 (2012) includes: Correction to maximal bound of DPBOFMAX to match ITU-T G.993.2 Annex Q. Increase the range of valid
9、 values of LSYMB. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.997.1 1999-07-02 15 11.1002/1000/4723 2.0 ITU-T G.997.1 2003-05-22 15 11.1002/1000/6283 2.1 ITU-T G.997.1 (2003) Amd. 1 2003-12-14 15 11.1002/1000/7081 2.2 ITU-T G.997.1 (2003) Amd. 2 2005-01-13 15 11.1002/1
10、000/7492 3.0 ITU-T G.997.1 2005-09-06 15 11.1002/1000/8550 4.0 ITU-T G.997.1 2006-06-06 15 11.1002/1000/8768 4.1 ITU-T G.997.1 (2006) Cor. 1 2006-12-14 15 11.1002/1000/8994 4.2 ITU-T G.997.1 (2006) Amd. 1 2006-12-14 15 11.1002/1000/8995 4.3 ITU-T G.997.1 (2006) Amd. 2 2007-11-22 15 11.1002/1000/9168
11、 4.4 ITU-T G.997.1 (2006) Amd. 3 2008-08-22 15 11.1002/1000/9389 5.0 ITU-T G.997.1 2009-04-22 15 11.1002/1000/9676 5.1 ITU-T G.997.1 (2009) Cor. 1 2009-11-13 15 11.1002/1000/10417 5.2 ITU-T G.997.1 (2009) Amd. 1 2010-06-11 15 11.1002/1000/10416 5.3 ITU-T G.997.1 (2009) Amd. 2 2010-11-29 15 11.1002/1
12、000/11016 5.4 ITU-T G.997.1 (2009) Amd. 3 2011-06-22 15 11.1002/1000/11130 5.5 ITU-T G.997.1 (2009) Cor. 2 2011-10-29 15 11.1002/1000/11397 5.6 ITU-T G.997.1 (2009) Amd. 4 2011-12-16 15 11.1002/1000/11398 5.7 ITU-T G.997.1 (2009) Amd. 5 2012-02-13 15 11.1002/1000/11504 6.0 ITU-T G.997.1 2012-06-13 1
13、5 11.1002/1000/11645 6.1 ITU-T G.997.1 (2012) Amd. 1 2012-12-07 15 11.1002/1000/11798 6.2 ITU-T G.997.1 (2012) Amd. 2 2013-04-22 15 11.1002/1000/11893 6.3 ITU-T G.997.1 (2012) Amd. 3 2013-08-29 15 11.1002/1000/11996 6.4 ITU-T G.997.1 (2012) Amd. 4 2015-02-13 15 11.1002/1000/12374 6.5 ITU-T G.997.1 (
14、2012) Amd. 5 2015-11-06 15 11.1002/1000/12566 6.6 ITU-T G.997.1 (2012) Amd. 6 2016-03-29 15 11.1002/1000/12798 6.7 ITU-T G.997.1 (2012) Cor. 1 2016-11-13 15 11.1002/1000/13108 * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the
15、 Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.997.1 (2012)/Cor.1 (11/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication techno
16、logies (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 World Telecom
17、munication 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. In some area
18、s 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 recognized oper
19、ating 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 words “shal
20、l“ 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 that the prac
21、tice 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 Recommendation develo
22、pment 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 therefore s
23、trongly 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.997.1 (2012)/Cor.1 (11/2016) 1 Recommendation ITU-T G.997.
24、1 Physical layer management for digital subscriber line transceivers Corrigendum 1 1) Correction to maximal bound of DPBOFMAX Modify clause 7.3.1.2.13 as follows: 7.3.1.2.13 Downstream power back-off Shaped (DPBOSHAPED) a) Downstream power back-off configuration parameters a.6) DPBO span maximum fre
25、quency (DPBOFMAX) DPBOFMAX defines the maximum frequency at which DPBO may be applied. It ranges from 138 kHz to 35323.687529997.75 kHz in steps of 4.3125 kHz. 2) Increase the range of valid values of LSYMB Modify clause 7.5.2.6.3 as follows: 7.5.2.6.3 Actual number of bits per symbol (LSYMB) This p
26、arameter reports the actual number of bits per symbol assigned to the latency path in which the bearer channel is transported. This value does not include trellis overhead. The value is coded in bits. It The range of valid values ranges is from 0 to 65535131071. Printed in Switzerland Geneva, 2017 S
27、ERIES 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 issues Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone tel
28、ecommunication 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 signals Series K Protect
29、ion 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 management, including TMN and network maintenance Series N Maintenance: international
30、 sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling, and associated measurements and tests Series R Telegraph transmission Series S
31、 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
