1、 International Telecommunication Union ITU-T G.997.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(12/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Access networks Physical layer management for digital subscriber li
2、ne (DSL) transceivers Amendment 1 Recommendation ITU-T G.997.1 (2012) Amendment 1 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-TRANSMISSIO
3、N 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.400G.449 COORDINATION OF RADIOTELEPHO
4、NY 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 fibre cable systems G.910G.919 Digital s
5、ections 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.959 Digital section and digital transmi
6、ssion 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 Access networks G.990G.999MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA
7、 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.1 (12/2012) i Recommendation ITU-T G.997.1 Phys
8、ical layer management for digital subscriber line (DSL) transceivers Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.997.1 (2012) contains the following additions and changes: Additional parameter for the reporting of the actually used AELE method. Changes for the control of the INP of ROC
9、. Add support for changes to PSD masks of ITU-T G.993.2 Annex B. Add line status parameters for ITU-T G.993.5. History Edition Recommendation Approval Study Group 1.0 ITU-T G.997.1 1999-07-02 15 2.0 ITU-T G.997.1 2003-05-22 15 2.1 ITU-T G.997.1 (2003) Amd. 1 2003-12-14 15 2.2 ITU-T G.997.1 (2003) Am
10、d. 2 2005-01-13 15 3.0 ITU-T G.997.1 2005-09-06 15 4.0 ITU-T G.997.1 2006-06-06 15 4.1 ITU-T G.997.1 (2006) Cor. 1 2006-12-14 15 4.2 ITU-T G.997.1 (2006) Amd. 1 2006-12-14 15 4.3 ITU-T G.997.1 (2006) Amd. 2 2007-11-22 15 4.4 ITU-T G.997.1 (2006) Amd. 3 2008-08-22 15 5.0 ITU-T G.997.1 2009-04-22 15 5
11、.1 ITU-T G.997.1 (2009) Cor. 1 2009-11-13 15 5.2 ITU-T G.997.1 (2009) Amd. 1 2010-06-11 15 5.3 ITU-T G.997.1 (2009) Amd. 2 2010-11-29 15 5.4 ITU-T G.997.1 (2009) Amd. 3 2011-06-22 15 5.5 ITU-T G.997.1 (2009) Cor. 2 2011-10-29 15 5.6 ITU-T G.997.1 (2009) Amd. 4 2011-12-16 15 5.7 ITU-T G.997.1 (2009)
12、Amd. 5 2012-02-13 15 6.0 ITU-T G.997.1 2012-06-13 15 6.1 ITU-T G.997.1 (2012) Amd. 1 2012-12-07 15 ii Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and commun
13、ication 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 on them with a view to standardizing telecommunications on a worldwide basis. The
14、 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 ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1
15、. 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 used for conciseness to indicate both a telecommunication administration and a r
16、ecognized 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 the Recommendation is achieved when all of these mandatory provisions are met. T
17、he 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 of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibilit
18、y 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 Property Rights, whether asserted by ITU members or others outside of the Recomm
19、endation 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, implementers are cautioned that this may not represent the latest information and
20、are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 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.1 (12/2012) 1 Recommendati
21、on ITU-T G.997.1 Physical layer management for digital subscriber line (DSL) transceivers Amendment 1 1) Addition of reporting of actual alternative electrical length estimation method 1.1) Clause 7.5.1.23.7 Add new clause 7.5.1.23.7: 7.5.1.23.7 “Actual Alternative Electrical Length Estimation Mode“
22、 (ACT-AELE-MODE) This parameter reports the actual AELE-MODE used in clause 7.2.1.3.2.1 of ITU-T G.993.2. The value of this parameter is 0, 1, 2 or 3. 1.2) Table 7-28 Add row to Table 7-28 Table 7-28 Line test, diagnostic and status parameters Category/Element Defined in clause: Q- Interface U-C Int
23、erface U-R Interface T-/S- Interface G- Interface Upstream power back-off UPBOKLE 7.5.1.23.1 R (M) R (O) R (O) UPBOKLE-R 7.5.1.23.2 R (O) R (O) R (O) UPBOKLE-pb 7.5.1.23.3 R (O) R (O) UPBOKLE-R-pb 7.5.1.23.4 R (O) R (O) R (O) RXTHRSHds 7.5.1.23.5 R (O) R (O) R (O) RXTHRSHus 7.5.1.23.6 R (O) R (O) AC
24、T-AELE-MODE 7.5.1.23.7 R (O) 1.3) Table 7-29 Add row to Table 7-29 Table 7-29 Support of line test, diagnostic and status parameters per Recommendation Category/Element ITU-T G.992.1 ITU-T G.992.2ITU-T G.992.3ITU-T G.992.4ITU-T G.992.5ITU-T G.993.2 ITU-T G.998.4 ITU-T G.993.5 Upstream power back-off
25、 2 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) Table 7-29 Support of line test, diagnostic and status parameters per Recommendation Category/Element ITU-T G.992.1 ITU-T G.992.2ITU-T G.992.3ITU-T G.992.4ITU-T G.992.5ITU-T G.993.2 ITU-T G.998.4 ITU-T G.993.5 UPBOKLE Y UPBOKLE-R Y UPBOKLE-pb Y UPBOKLE-R-
26、pb Y RXTHRSHds Y RXTHRSHus Y ACT-AELE-MODE Y 2) Changes for the control of the INP of ROC 2.1) Clauses 7.3.1.10.11 and 7.3.1.10.12 Modify clauses 7.3.1.10.11 and 7.3.1.10.12 as follows: 7.3.1.10.11 Downstream minimum INP of ROC (INPMIN-ROC-ds) This parameter contains the minimum impulse noise protec
27、tion to apply on the ROC in the downstream direction expressed in multiples of equivalent 4k DMT symbol length (denoted T4k, see clause 10.4.4 of ITU-T G.993.2). The minimum impulse noise protection is an integer ranging from 0 to 168. 7.3.1.10.12 Upstream minimum INP of ROC (INPMIN-ROC-us) This par
28、ameter contains the minimum impulse noise protection to apply on the robust ROC in the upstream direction expressed in multiples of T4k. The minimum impulse noise protection is an integer ranging from 0 to 168. 2.2) Clause 7.5.1.34 Modify clause 7.5.1.34 as shown: 7.5.1.34 Actual impulse noise prote
29、ction of ROC 7.5.1.34.1 Downstream actual impulse noise protection of ROC (ACTINP-ROC-ds) This parameter reports the actual impulse noise protection (INP) of the ROC in the downstream direction expressed in multiples of T4kin the L0 state. In the L1 or L2 states, the parameter contains the value in
30、the previous L0 state. The value is coded in fractions of T4k with a granularity of 0.1. The range is from 0 to 25.4. A special value indicates an ACTINP-ROC-ds higher than 25.4. The format and usage is identical to the channel status parameter ACTINP (see clause 7.5.2.4). 7.5.1.34.2 Upstream actual
31、 impulse noise protection of ROC (ACTINP-ROC-us) This parameter reports the actual impulse noise protection (INP) of the ROC in the upstream direction expressed in multiples of T4kin the L0 state. In the L1 or L2 states, the parameter contains the value in the previous L0 state. Rec. ITU-T G.997.1 (
32、2012)/Amd.1 (12/2012) 3 The value is coded in fractions of T4k with a granularity of 0.1. The range is from 0 to 25.4. A special value indicates an ACTINP-ROC-us higher than 25.4. The format and usage is identical to the channel status parameter ACTINP (see clause 7.5.2.4). 3) Add support for change
33、s to ITU-T G.993.2 Annex B PSD masks 3.1) 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 limit power spectral density masks (limit PSD masks) are grouped in the following P
34、SD 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-NUS0, 997E30-M2x-NUS0. Class 998-M1x Annex B of ITU-T G.993.2: 998-
35、M1x-A, 998-M1x-B, 998-M1x-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. Class 998ADE-M2x Annex B of ITU-T G.993.2: 998-M2x-A, 998-M2x-M, 998-M2x-B, 998-M2x-NUS0, 998ADE17-M2x-A, 998
36、ADE17-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 (C.2.1.2/G.993.2). Class 998-CO Annex C of ITU-T G.993.2: POTS-138co, POTS-276co (clause C.2.1.1 o
37、f 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 respective passband above 552 kHz. One CLASSMASK parameter is defined
38、 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 indicated in Table 7-6. 4 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) Table 7-6 Definition of values of CLASSMASK per ITU-T G.993.2 Annex Pa
39、rameter 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-M2x4 998-M1x 5 998-M2x6 998ADE-M2x7 HPE NOTE A single PSD mask class shall be selected per G.993.2 Annex. 3.2) Clause 7.3.1.2.16 Modify clause 7.3.1.2.16 as follows: 7.3.1.2.16
40、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 near-end xTU on this line for each class of profiles. One LIMITMASK parameter is defined per the ITU-T G.993.2 Annex enable
41、d in the XTSE. The profiles are grouped in the following profile classes: Class 8: Profiles 8a, 8b, 8c, 8d Class 12: Profiles 12a, 12b Class 17: Profile 17a Class 30: Profile 30a For each profile class, several limit PSD masks of the selected PSD mask class (CLASSMASK) may be enabled. The enabling p
42、arameter is coded in a bit-map representation (0 if the associated mask is not allowed, 1 if it is allowed). The parameter has the bit definitions for each PSD mask class as indicated in Table 7-7. 5 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) Table 7-7 Definition of bits of LIMITMASK for each CLASSMA
43、SK Bit number Profile class PSD mask classes Annex A Annex B Annex C 998 Annex A 998-M1xAnnex B 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B 997-M1cAnnex B 997-M2x Annex B HPE-M1 Annex B 998-B Annex C 998-CO Annex C Octet 1 1 8 D-32 M1x-A M2x-A M2x-A M1c-A-7 POTS-138b POTS_ 138co 2 8 D-48 M1x-
44、B M2x-B M2x-B TCM-ISDN POTS_ 276co 3 8 M2x-M M2x-M M1x-M POTS_276b 4 8 M1x-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 8 8 6 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) Table 7-7 Definition of bits of LIMITMASK for each CLASSMASK Bit number Profile class PSD m
45、ask classes Annex A Annex B Annex C 998 Annex A 998-M1xAnnex B 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B 997-M1cAnnex B 997-M2x Annex B HPE-M1 Annex B 998-B Annex C 998-CO Annex C Octet 3 1 12 D-32 M1x-A M2x-A M2x-A POTS-138b POTS_ 138co 2 12 D-48 M1x-B M2x-B M2x-B TCM-ISDN POTS_ 276co 3 12
46、 M2x-M M2x-M M1x-M POTS_276b 4 12 M1x-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 7 12 8 12 7 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) Table 7-7 Definition of bits of LIMITMASK for each CLASSMASK Bit number Profile class PSD mask classes Annex A Annex
47、 B Annex C 998 Annex A 998-M1xAnnex B 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B 997-M1cAnnex B 997-M2x Annex B HPE-M1 Annex B 998-B Annex C 998-CO Annex C Octet 5 1 17 D-32 E17-M2x-NUS0 ADE17-M2x-A E17-M2x-NUS0 17-M1-NUS0 POTS-138b 2 17 D-48 E17-M2x-NUS0-M ADE17-M2x-B TCM-ISDN 3 17 ADE17-M2
48、x-NUS0-M POTS_276b 4 17 ADE17-M2x-M 5 17 6 17 7 17 8 17 Octet 6 1 17 D-64 2 17 D-128 3 17 4 17 5 17 6 17 7 17 8 17 8 Rec. ITU-T G.997.1 (2012)/Amd.1 (12/2012) 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-M1xAnnex B 998-M2x Annex B 998ADE-M2x Annex B 997-M1x Annex B 997-M1cAnnex B 997-M2x Annex B HPE-M1 Annex B 998-B Annex C 998-CO Annex C Octet 7 1 30 D-32 E30-M2x-NUS0 ADE30-M2x-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
