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 Amendment 6 (03/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Physical
2、 layer management for digital subscriber line transceivers Amendment 6 Recommendation ITU-T G.997.1 (2012) Amendment 6 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMO
3、N 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 LINES G.
4、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 optical fib
5、re 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.950G.95
6、9 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 USER-
7、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)/Amd.
8、6 (03/2016) i Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Amendment 6 Summary Amendment 6 to Recommendation ITU-T G.997.1 (2012) contains: The reporting of the number of Reed-Solomon code word per DTU. The definition of the LOM failure (correction)
9、. 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 11.1002/1000/7492 3.0 ITU
10、-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 4.4 ITU-T G.997
11、.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 11.1002/1000/11016 5.4 IT
12、U-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 15 11.1002/1000/1
13、1645 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 (2012) Amd. 5 201
14、5-11-06 15 11.1002/1000/12566 6.6 ITU-T G.997.1 (2012) Amd. 6 2016-03-29 15 11.1002/1000/12798 * To access the Recommendation, type the URL http:/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-
15、en. ii Rec. ITU-T G.997.1 (2012)/Amd.6 (03/2016) FOREWORD The International Telecommunication 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 perm
16、anent 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 Telecommunication Standardization Assembly (WTSA), which meets every four years, establi
17、shes 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 areas of information technology which fall within ITU-Ts purview, the necessary stand
18、ards 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 operating agency. Compliance with this Recommendation is voluntary. However, the Reco
19、mmendation 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 “shall“ or some other obligatory language such as “must“ and the negative equivalents
20、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 practice or implementation of this Recommendation may involve the use of a claimed In
21、tellectual 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 development process. As of the date of approval of this Recommendation, ITU had receive
22、d 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 strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/.
23、 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.997.1 (2012)/Amd.6 (03/2016) 1 Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Amendment 6
24、1) The reporting of the number of Reed-Solomon codeword per DTU 1.1) Clause 7.5.2.6.6 Add clause 7.5.2.6.6: 7.5.2.6.6 Actual number of Reed-Solomon codeword per DTU (RSPERDTU) This parameter reports the actual number of Reed-Solomon codeword per DTU used in the latency path in which the bearer chann
25、el is transported. The value ranges from 1 to 64 in steps of 1. 1.2) Tables 7-30 and 7-31 Modify Tables 7-30 and 7-31 as follows: Table 7-30 Channel test, diagnostic and status parameters Category/Element Defined in clause: Q- Interface U-C Interface U-R Interface T-/S- Interface G- Interface (.) IN
26、TLVBLOCK 7.5.2.6.5 R (M) R (O) R (O) RSPERDTU 7.5.2.6.6 R (M) R (O) R (O) Actual latency path (.) Table 7-31 Support of channel test, diagnostic and status parameters per Recommendation Category/Element ITU-T G.992.1 ITU-T G.992.2 ITU-T G.992.3 ITU-T G.992.4 ITU-T G.992.5 ITU-T G.993.2 ITU-T G.998.4
27、 (.) INTLVBLOCK Y RSPERDTU Y Actual latency path (.) 2 Rec. ITU-T G.997.1 (2012)/Amd.6 (03/2016) 2) Addition of LOM failure 2.1) Clause 7.1.1.1.4 Add clause 7.1.1.1.4: 7.1.1.1.4 Loss-of-margin (LOM) failure A LOM failure is declared when a re-initialization is triggered by a persistent near-end lom
28、defect, except when an LOS or LOF defect or failure is present (see LOS and LOF definitions above). A LOM failure is cleared when LOS or LOF failure is declared, or after 10 0.5 s of no LOM defect. 2.2) Clause 7.1.1.2.4 Add clause 7.1.1.2.4: 7.1.1.2.4 Loss-of-margin (LOM-FE) failure A far-end loss-o
29、f-margin LOM-FE failure is declared when a re-initialization is triggered by a persistent far-end lom defect, except when an LOS-FE or LOF-FE defect or failure is present (see LOS and LOF definitions above). A far-end LOM failure is cleared when far-end LOS or LOF failure is declared, or after 10 0.
30、5 s of no far-end LOM defect. 2.3) Table 7-10 Modify Table 7-10 as follows: Table 7-10 Line failures Category/Element Defined in clause: Q- Interface U-C Interface U-R Interface T-/S- Interface Near-end (xTU-C) failures Loss of signal (LOS) 7.1.1.1.1 R (M) R (O) R (O) Loss of frame (LOF) 7.1.1.1.2 R
31、 (M) R (O) R (O) Loss of power (LPR) 7.1.1.1.3 R (M) R (O) R (O) Loss of margin (LOM) 7.1.1.1.4 R (M) R (O) R (O) Far-end (xTU-R) failures Loss-of-signal (LOS-FE) failure 7.1.1.2.1 R (M) R (O) R (O) Loss-of-frame (LOF-FE) failure 7.1.1.2.2 R (M) R (O) R (O) Loss-of-power (LPR-FE) failure 7.1.1.2.3 R
32、 (M) R (O) R (O) Loss-of-margin (LOM-FE) failure 7.1.1.2.4 R (M) R (O) R (O) Initialization failures Line init (LINIT) failure 7.1.1.3 R (M) R (O) Rec. ITU-T G.997.1 (2012)/Amd.6 (03/2016) 3 2.4) Table 7-11 Modify Table 7-11 as follows: Table 7-11 Support of line failures per Recommendation Category
33、/ Element ITU-T G.992.1 ITU-T G.992.2 ITU-T G.992.3 ITU-T G.992.4 ITU-T G.992.5 ITU-T G.993.2 Near-end failures Loss of signal (LOS) Y Y Y Y Y Y Loss of frame (LOF) Y Y Y Y Y Y Loss of power (LPR) Y Y Y Y Y Y Loss of margin (LOM) Y Y Y Y Y Y Far-end failures Loss-of-signal (LOS-FE) failure Y Y Y Y Y
34、 Y Loss-of-frame (LOF-FE) failure Y Y Y Y Y Y Loss-of-power (LPR-FE) failure Y Y Y Y Y Y Loss-of-margin (LOM-FE) failure Y Y Y Y Y Y Initialization failures Line init (LINIT) failure Y Y Y Y Y Y Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of
35、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 Seri
36、es 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 protection
37、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 obj
38、ective 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
