1、 International Telecommunication Union ITU-T G.992.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 2(06/2011) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Access networks Asymmetric digital subscriber line transceivers 2
2、 (ADSL2) Corrigendum 2 Recommendation ITU-T G.992.3 (2009) Corrigendum 2 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 ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS
3、 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.449 COORDINATION OF RADIOTELEPHONY AND LI
4、NE 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 cable systems G.910G.919 Digital sections a
5、t 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 Digital section and digital transmission sys
6、tems 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 Access networks G.990G.999MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTE
7、RISTICS 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.992.3 (2009)/Cor.2 (06/2011) i Recommendation ITU-T G.992.3 Asymmetric di
8、gital subscriber line transceivers 2 (ADSL2) Corrigendum 2 Summary Corrigendum 2 to Recommendation ITU-T G.992.3 (2009) describes the exchange of virtual noise shape in loop diagnostics. History Edition Recommendation Approval Study Group 1.0 ITU-T G.992.3 2002-07-29 15 1.1 ITU-T G.992.3 (2002) Amen
9、d. 1 2003-05-22 15 1.2 ITU-T G.992.3 (2002) Cor. 1 2003-12-14 15 1.3 ITU-T G.992.3 (2002) Cor. 2 2004-02-22 15 1.4 ITU-T G.992.3 (2002) Amend. 2 2004-04-30 15 1.5 ITU-T G.992.3 (2002) Amend. 3 2004-06-13 15 1.6 ITU-T G.992.3 (2002) Amend. 4 2004-06-13 15 2.0 ITU-T G.992.3 2005-01-13 15 2.1 ITU-T G.9
10、92.3 (2005) Amend. 1 2005-09-22 15 2.2 ITU-T G.992.3 (2005) Amend. 2 2006-03-29 15 2.3 ITU-T G.992.3 (2005) Amend. 3 2006-12-14 15 2.4 ITU-T G.992.3 (2005) Amend. 4 2007-07-29 15 2.5 ITU-T G.992.3 (2005) Amend. 5 2008-06-22 15 3.0 ITU-T G.992.3 2009-04-22 15 3.1 ITU-T G.992.3 (2009) Cor. 1 2009-11-1
11、3 15 3.2 ITU-T G.992.3 (2009) Amend. 1 2010-03-01 15 3.3 ITU-T G.992.3 (2009) Amend. 2 2010-07-29 15 3.4 ITU-T G.992.3 (2009) Amend. 3 2010-11-29 15 3.5 ITU-T G.992.3 (2009) Cor. 2 2011-06-22 15 ii Rec. ITU-T G.992.3 (2009)/Cor.2 (06/2011) FOREWORD The International Telecommunication Union (ITU) is
12、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 questions and issuing R
13、ecommendations 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 Recommendations on these topics.
14、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 Recommendation, the expression “Adm
15、inistration“ 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., interoperability or applicability) and
16、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 compliance with the Recommendat
17、ion 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 or applicability of claim
18、ed 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 implement this Recommendat
19、ion. 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 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, witho
20、ut the prior written permission of ITU. Rec. ITU-T G.992.3 (2009)/Cor.2 (06/2011) 1 Recommendation ITU-T G.992.3 Asymmetric digital subscriber line transceivers 2 (ADSL2) Corrigendum 2 1 The exchange of Virtual Noise shape in Loop Diagnostic (corrigendum) Add a row to Table 8-20/G.992.3 after the on
21、e for “support of downstream virtual noise“ as follows: Table 8-20/G.992.3 ATU-C CL message Par(2) PMD bit definitions NPar(2) bit Definition Support of downstream virtual noise in diagnostics mode When set to 1, indicates that the ATU-C supports the transmission of the downstream virtual noise para
22、meter in the C-MSG-PCB message during diagnostics mode (see Table 8-44). When set to 0, no indication is given as to whether or not the ATU-C supports the transmission of the downstream virtual noise parameter in the C-MSG-PCB message during diagnostics mode. If this bit is set to 1, then the bit in
23、dicating support of downstream virtual noise shall also be set to 1. Add a row at the end of Table 8-21/G.992.3 as follows: Table 8-21/G.992.3 ATU-C MS message Par(2) PMD bit definitions NPar(2) bit Definition Support of downstream virtual noise in diagnostics mode Set to 1 if and only if this bit w
24、as set to 1 in both the last previous CL and the last previous CLR message and the diagnostics mode bit is set to 1 in this MS message. When set to 1, indicates that the ATU-C shall transmit the downstream virtual noise parameter in the C-MSG-PCB message during diagnostics mode (see Table 8-44). Whe
25、n set to 0, indicates that the ATU-C shall not transmit the downstream virtual noise parameter in the C-MSG-PCB message during diagnostics mode. NOTE The behavior of the ATU-R is unspecified if this bit is set to 0 while both the diagnostics mode bit and the support of downstream virtual noise bit a
26、re set to 1. Add a row to Table 8-22/G.992.3 after the one for “support of downstream virtual noise“ as follows: Table 8-22/G.992.3 ATU-R CLR message Par(2) PMD bit definitions NPar(2) bit Definition Support of downstream virtual noise in diagnostics mode When set to 1, indicates that the ATU-R supp
27、orts the reception of the downstream virtual noise parameter in the C-MSG-PCB message during diagnostics mode (see Table 8-44). When set to 0, no indication is given as to whether or not the ATU-R supports the reception of the downstream virtual noise parameter in the C-MSG-PCB message during diagno
28、stics mode. If this bit is set to 1, then the bit indicating support of downstream virtual noise shall also be set to 1. 2 Rec. ITU-T G.992.3 (2009)/Cor.2 (06/2011) Add a row at the end of Table 8-23/G.992.3 as follows: Table 8-23/G.992.3 ATU-R MS message Par(2) PMD bit definitions NPar(2) bit Defin
29、ition Support of downstream virtual noise in diagnostics mode Set to 1 if and only if this bit was set to 1 in both the last previous CL and the last previous CLR message and the diagnostics mode bit is set to 1 in this MS message. When set to 1, indicates that the ATU-C shall transmit the downstrea
30、m virtual noise parameter in the C-MSG-PCB message during diagnostics mode (see Table 8-44). When set to 0, indicates that the ATU-C shall not transmit the downstream virtual noise parameter in the C-MSG-PCB message during diagnostics mode (see Table 8-44). NOTE The behavior of the ATU-R is unspecif
31、ied if this bit is set to 0 while both the diagnostics mode bit and the support of downstream virtual noise bit are set to 1. Modify Table 8-44/G.992.3 in clause 8.15.2.1 as follows: Table 8-44/G.992.3 Bit definition for the C-MSG-PCB message Bit index Parameter Definition 5 . 0 C-MIN_PCB_DS See Tab
32、le 8-27 11 . 6 C-MIN_PCB_US See Table 8-27 13 . 12 HOOK_STATUS See Table 8-27 15 . 14 Reserved, set to 0 NSCus + 15 . 16 C_BLACKOUT See Table 8-27 24NBPds + 15 + NSCus 16 + NSCus TXREFVNds NBPds breakpoints for downstream virtual noise PSD (24 bits per breakpoint, as defined in clause 8.5.1.1.2) (se
33、e NOTE) 24NBPds + NSCus + 23 . 24NBPds + NSCus + 16 Pass/Fail Success or Failure Cause indication of last previous initialization 24NBPds + NSCus + 31 . 24NBPds + NSCus + 24 Last_TX_State Last transmitted state of last previous initialization NOTE This parameter shall be included in the message if a
34、nd only if the support of downstream virtual noise during diagnostics mode bit is set to 1 in the G.994.1 MS message (see Table 8-21 and Table 8-23). If this parameter is not included in the message, then the bit index for other parameters shall be determined with NBPds = 0. Printed in Switzerland G
35、eneva, 2011 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 and med
36、ia, 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, installation
37、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 and sub
38、jective 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
