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 4 (02/2015) 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 4 Recommendation ITU-T G.997.1 (2012) Amendment 4 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、4 (02/2015) i Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Amendment 4 Summary Amendment 4 to Recommendation ITU-T G.997.1 (2012) includes the following additions: counter of uncorrected DTUs correct name of the PSD mask 997E17 M2x-NUS0 to 997E17 M2
9、x-A. 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
10、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 4.4 ITU-T G.
11、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 11.1002/1000/11016 5.4
12、 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 15 11.1002/100
13、0/11645 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 _ * To access the Recommendation
14、, 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-en. ii Rec. ITU-T G.997.1 (2012)/Amd.4 (02/2015) FOREWORD The International Telecommunication Union (ITU) is the United Natio
15、ns 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 Recommendations o
16、n 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. The approval of
17、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 “Administration“ is
18、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 compliance with
19、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 Recommendation is required
20、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 Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual P
21、roperty 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 Recommendation. However, imp
22、lementers 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 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior writ
23、ten permission of ITU. Rec. ITU-T G.997.1 (2012)/Amd.4 (02/2015) 1 Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Amendment 4 1) Add channel performance monitoring counters for uncorrected DTUs Add clause 7.2.2.1.3. 7.2.2.1.3 Uncorrected DTU Channel (
24、RTXUC-C) This parameter is a count of rtx-uc anomalies (the number of uncorrected DTUs) occurring in the bearer channel during the accumulation period. Add clause 7.2.2.2.3. 7.2.2.2.3 Uncorrected DTU Channel far-end (RTXUC-CFE) This parameter is a count of far-end rtx-uc anomalies (the number of unc
25、orrected DTUs) occurring in the bearer channel during the accumulation period. Modify Tables 7-24 and 7-25 as follows: Table 7-24 Channel performance monitoring parameters Category/Element Defined in clause: Q- Interface U-C Interface U-R Interface T-/S- Interface Near-end (xTU-C) performance monito
26、ring counters (current and previous 15-minute interval) CV-C counter 15 minutes 7.2.2.1.1 R (M) R (O) FEC-C counter 15 minutes 7.2.2.1.2 R (M) R (O) RTXUC-C counter 15 minutes 7.2.2.1.3 R(M) R(O) Near-end (xTU-C) performance monitoring counters (current and previous 24-hour interval) CV-C counter 24
27、 hours 7.2.2.1.1 R (M) R (O) FEC-C counter 24 hours 7.2.2.1.2 R (M) R (O) RTXUC-C counter 24 hours 7.2.2.1.3 R(M) R(O) Far-end (xTU-R) performance monitoring counters (current and previous 15-minute interval) CV-CFE counter 15 minutes 7.2.2.2.1 R (M) R (O) FEC-CFE counter 15 minutes 7.2.2.2.2 R (M)
28、R (O) RTXUC-CFE counter 15 minutes 7.2.2.2.3 R (M) R (O) Far-end (xTU-R) performance monitoring counters (current and previous 24-hour interval) CV-CFE counter 24 hours 7.2.2.2.1 R (M) R (O) FEC-CFE counter 24 hours 7.2.2.2.2 R (M) R (O) RTXUC-CFE counter 24 hours 7.2.2.2.3 R (M) R (O) 2 Rec. ITU-T
29、G.997.1 (2012)/Amd.4 (02/2015) Table 7-25 Support of channel performance monitoring 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 Near-end performance monitoring counters (current and previous 15-minut
30、e interval) CV-C counter 15 minutes Y Y Y Y Y Y FEC-C counter 15 minutes Y Y Y Y Y Y RTXUC-C counter 15 minutes Y Near-end performance monitoring counters (current and previous 24-hour interval) CV-C counter 24 hours Y Y Y Y Y Y FEC-C counter 24 hours Y Y Y Y Y Y RTXUC-C counter 24 hours Y Far-end p
31、erformance monitoring counters (current and previous 15-minute interval) CV-CFE counter 15 minutes Y Y Y Y Y Y FEC-CFE counter 15 minutes Y Y Y Y Y Y RTXUC-CFE counter 15 minutes Y Far-end performance monitoring counters (current and previous 24-hour interval) CV-CFE counter 24 hours Y Y Y Y Y Y FEC
32、-CFE counter 24 hours Y Y Y Y Y Y RTXUC-CFE counters 24 hours Y 2) Correct name of the PSD mask 997E17-M2x-NUS0 to 997E17-M2x-A Modify clause 7.3.1.2.15 as follows: 7.3.1.2.15 VDSL2 PSD mask class selection (CLASSMASK) In order to reduce the number of configuration possibilities, the limit power spe
33、ctral density masks (limit PSD masks) are grouped in the following PSD mask classes: Class 998 Annex A of ITU-T G.993.2: D-32, D-48, D-64, D-128. Class 997-M1c Annex B of ITU-T G.993.2: 997-M1c-A-7. Class 997-M1x Annex B of ITU-T G.993.2: 997-M1x-M. Class 997-M2x Annex B of ITU-T G.993.2: 997E17-M2x
34、-NUS0A, 997E30-M2x-NUS0. Class 998-M2x Annex B of ITU-T G.993.2: 998-M2x-A, 998-M2x-M, 998-M2x-B, 998-M2x-NUS0, 998E17-M2x-NUS0, 998E17-M2x-NUS0-M, 998E30-M2x-NUS0, 998E30-M2x-NUS0-M, 998E17-M2x-A. Rec. ITU-T G.997.1 (2012)/Amd.4 (02/2015) 3 Class 998ADE-M2x Annex B of ITU-T G.993.2: 998-M2x-A, 998-
35、M2x-M, 998-M2x-B, 998-M2x-NUS0, 998ADE17-M2x-A, 998ADE17-M2x-B, 998ADE17-M2x-M, 998ADE17-M2x-NUS0-M, 998ADE30-M2x-NUS0-A, 998ADE30-M2x-NUS0-M, HPEADE1230, HPEADE1730. Class 998-B Annex C: POTS-138b, POTS-276b (clause C.2.1.1 of ITU-T G.993.2), TCM-ISDN (clause C.2.1.2 of ITU-T G.993.2). Class 998-CO
36、 Annex C of ITU-T G.993.2: POTS-138co, POTS-276co (clause C.2.1.1 of ITU-T G.993.2). Class HPE-M1 Annex B of ITU-T G.993.2: HPE17-M1-NUS0, HPE30-M1-NUS0, HPE1230-M1-NUS0, HPE1730-M1-NUS0. Each class is designed such that the PSD levels of each limit PSD mask of a specific class are equal in their re
37、spective passband above 552 kHz. (.) 4 Rec. ITU-T G.997.1 (2012)/Amd.4 (02/2015) Modify Table 7-7 as follows: Table 7-7 Definition of bits of LIMITMASK for each CLASSMASK Bit number Profile class PSD mask classes Annex A Annex B Annex C 998 Annex A 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B
38、997-M1c Annex B 997-M2x Annex B HPE-M1 Annex B 998-B Annex C 998-CO Annex C Octet 1 . . . . . . . . . . . Octet 5 1 17 D-32 E17-M2x-NUS0 ADE17-M2x-A E17-M2x-NUS0A 17-M1-NUS0 POTS-138b 2 17 D-48 E17-M2x-NUS0-M ADE17-M2x-B TCM-ISDN 3 17 E17-M2x-A ADE17-M2x-NUS0-M POTS_276b 4 17 ADE17-M2x-M 5 17 6 17 7
39、 17 8 17 Octet 6 . . . . . . . . . . . NOTE All unassigned bits are reserved by ITU. Printed in Switzerland Geneva, 2015 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 operat
40、ion 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 of television, sound program
41、me and other multimedia signals Series K Protection against interference Series L 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 sound programme a
42、nd 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 transmission Series S Telegraph services terminal equipment Series T Terminals for telematic serv
43、ices 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
