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 5 (11/2015) 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 5 Recommendation ITU-T G.997.1 (2012) Amendment 5 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、5 (11/2015) i Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers Amendment 5 Summary Amendment 5 to Recommendation ITU-T G.997.1 (2012) includes: Support for ITU-T G.993.2 Annex Q (profile 35b). Support for retransmitted DTU counter parameters. History Ed
9、ition 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-T G.997.1 2
10、005-09-06 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.997.1 (2006) Am
11、d. 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 ITU-T G.997.1
12、(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 11.1002/1000/11645 6.1 ITU
13、-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 2015-11-06 15 1
14、1.1002/1000/12566 * 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-en. ii Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) FOREWORD The International T
15、elecommunication 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 permanent organ of ITU. ITU-T is responsible for studying technical, operating an
16、d 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, establishes the topics for study by the ITU-T study groups which, in turn, produce R
17、ecommendations 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 standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Rec
18、ommendation, 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 Recommendation may contain certain mandatory provisions (to ensure, e.g., interop
19、erability 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 are used to express requirements. The use of such words does not suggest that
20、 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 Intellectual Property Right. ITU takes no position concerning the evidence, val
21、idity 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 received notice of intellectual property, protected by patents, which may be require
22、d 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/. ITU 2016 All rights reserved. No part of this publication may be reproduced,
23、 by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 1 Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers 1) Support for G.993.2 Annex Q (Profile 35b) 1.1) Clause 7.3.1.1.11 Modify clause 7.3.1.1
24、.11 as follows: 7.3.1.1.11 VDSL2 profiles enabling (PROFILES) This configuration parameter contains the ITU-T G.993.2 profiles to be allowed by the near-end xTU on this line. It is coded in a bit-map representation (0 if not allowed, 1 if allowed) with the following definition: Bit Representation Oc
25、tet 1 1 ITU-T G.993.2 profile 8a. 2 ITU-T G.993.2 profile 8b. 3 ITU-T G.993.2 profile 8c. 4 ITU-T G.993.2 profile 8d. 5 ITU-T G.993.2 profile 12a. 6 ITU-T G.993.2 profile 12b. 7 ITU-T G.993.2 profile 17a. 8 ITU-T G.993.2 profile 30a. Octet 2 1 ITU-T G.993.2 profile 35b. 2 reserved by ITU-T. 3 reserv
26、ed by ITU-T. 4 reserved by ITU-T. 5 reserved by ITU-T. 6 reserved by ITU-T. 7 reserved by ITU-T. 8 reserved by ITU-T. 1.2) Clause 7.3.1.2.15 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 li
27、mit power spectral 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.
28、2: 997E17-M2x-A, 997E30-M2x-NUS0. 2 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 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. Class 998ADE-M2x Annex B of ITU-T G.993.2: 998-M2
29、x-A, 998-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). Cla
30、ss 998-CO 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. Class 998E35-M2x Annex B of ITU-T G.993.2: 998-M2x-A, 998-M2x-M, 998-M2x-B, 998-M2x-NUS0, 998E17-M2x-NU
31、S0, 998E17-M2x-NUS0-M, 998E17-M2x-A, 998E35-M2x-A. Class 998ADE35-M2x Annex B of ITU-T G.993.2: 998-M2x-A, 998-M2x-M, 998-M2x-B, 998-M2x-NUS0, 998ADE17-M2x-A, 998ADE17-M2x-B, 998ADE17-M2x-M, 998ADE17-M2x-NUS0-M, 998ADE35-M2x-A, 998ADE35-M2x-B, 998ADE35-M2x-M. Each class is designed such that the PSD
32、 levels of each limit PSD mask of a specific class are equal in their respective passband above 552 kHz. One CLASSMASK parameter is defined per the ITU-T G.993.2 Annex enabled in the XTSE. It selects a single PSD mask class per the ITU-T G.993.2 Annex that is activated at the VTU-O. The coding is as
33、 indicated in Table 7-6. Table 7-6 Definition of values of CLASSMASK per ITU-T G.993.2 Annex Parameter value ITU-T G.993.2 Annex A ITU-T G.993.2 Annex B ITU-T G.993.2 Annex C 1 998 997-M1c 998-B 2 997-M1x 998-CO 3 997-M2x 4 5 998-M2x 6 998ADE-M2x 7 HPE 8 998E35-M2x 9 998ADE35-M2x NOTE A single PSD m
34、ask class shall be selected per ITU-T G.993.2 Annex. 1.3) Clause 7.3.1.2.16 Modify clause 7.3.1.2.16 as follows: 7.3.1.2.16 VDSL2 limit PSD masks and band plans enabling (LIMITMASK) This configuration parameter contains the ITU-T G.993.2 limit PSD masks of the selected PSD mask class, enabled by the
35、 near-end xTU on this line for each class of profiles. One LIMITMASK parameter is defined per the ITU-T G.993.2 Annex enabled in the XTSE. Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 3 The profiles are grouped in the following profile classes: Class 8: Profiles 8a, 8b, 8c, 8d Class 12: Profiles 12a, 1
36、2b Class 17: Profile 17a Class 30: Profile 30a Class 35: Profile 35b For each profile class, several limit PSD masks of the selected PSD mask class (CLASSMASK) may be enabled. The enabling parameter is coded in a bit-map representation (0 if the associated mask is not allowed, 1 if it is allowed). T
37、he parameter has the bit definitions for each PSD mask class as indicated in Table 7-7. 4 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 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 An
38、nex B 997-M1x Annex B 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C Octet 1 1 8 D-32 M2x-A M2x-A M1c-A-7 M2x-A M2x-A POTS-138b POTS_ 138co 2 8 D-48 M2x-B M2x-B M2x-B M2x-B TCM-ISDN POTS_ 276co 3 8 M2x-M M2x-M M1x-M M2x-M M2x-M POTS_276b 4
39、8 M2x-NUS0 M2x-NUS0 M2x-NUS0 M2x-NUS0 5 8 6 8 7 8 8 8 Octet 2 1 8 D-64 2 8 D-128 3 8 4 8 5 8 6 8 7 8 5 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 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
40、998ADE-M2x Annex B 997-M1x Annex B 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C 8 8 Octet 3 1 12 D-32 M2x-A M2x-A M2x-A M2x-A POTS-138b POTS_ 138co 2 12 D-48 M2x-B M2x-B M2x-B M2x-B TCM-ISDN POTS_ 276co 3 12 M2x-M M2x-M M1x-M M2x-M M2x-M
41、POTS_276b 4 12 M2x-NUS0 M2x-NUS0 M2x-NUS0 M2x-NUS0 5 12 6 12 7 12 8 12 Octet 4 1 12 D-64 2 12 D-128 3 12 4 12 5 12 6 12 6 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 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
42、 A 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C 7 12 8 12 Octet 5 1 17 D-32 E17-M2x-NUS0 ADE17-M2x-A E17-M2x-A E17-M2x-NUS017-M1-NUS0 ADE17-M2x-A POTS-138b 2 17 D-48 E17-M2x-NUS0-M ADE17-
43、M2x-B E17-M2x-NUS0-M ADE17-M2x-B TCM-ISDN 3 17 E17-M2x-A ADE17-M2x-NUS0-M E17-M2x-A ADE17-M2x-NUS0-M POTS_276b 4 17 ADE17-M2x-M ADE17-M2x-M 5 17 6 17 7 17 8 17 Octet 6 1 17 D-64 2 17 D-128 3 17 7 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) Table 7-7 Definition of bits of LIMITMASK for each CLASSMASK B
44、it 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 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C 4 17 5 17 6 17 7 17 8 17 Octet 7 1 30 D-32 E30-M2x-NUS0 ADE30-M2x
45、-NUS0-A E30-M2x-NUS0 30-M1-NUS0 POTS-138b 2 30 D-48 E30-M2x-NUS0-M ADE30-M2x-NUS0-M 1230-M1-NUS0 TCM-ISDN 3 30 HPEADE1230-NUS0 1730-M1-NUS0 POTS_276b 4 30 HPEADE1730-NUS0 5 30 6 30 7 30 8 30 Octet 8 8 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) Table 7-7 Definition of bits of LIMITMASK for each CLASSM
46、ASK 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 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C 1 30 D-64 2 30 D-128 3 30 4 30 5 30 6 30 7 30 8 30 Octet 9 1
47、 35 E35-M2x-A ADE35-M2x-A 2 35 ADE35-M2x-B 3 35 ADE35-M2x-M 4 35 5 35 6 35 7 35 8 35 9 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 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
48、 B 997-M1x Annex B 997-M1c Annex B 997-M2x Annex B 998E35-M2xHPE-M1 Annex B 998ADE35-M2x Annex B 998-B Annex C 998-CO Annex C NOTE All unassigned bits are reserved by ITU. 10 Rec. ITU-T G.997.1 (2012)/Amd.5 (11/2015) 1.4) Clause 7.5.1.26.2 Modify clause 7.5.1.26.2 as follows: 7.5.1.26.2 Downstream H(f) linear subcarrier group size (HLINGds) This parameter is the number of subcarriers per group used to report HLINpsds. The valid values are 1, 2, 4, and 8 and 16. For ADSL, this parameter is equal to
