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.994.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 4 (12/2014) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Handshak
2、e procedures for digital subscriber line transceivers Amendment 4 Additional codepoints for the support of ITU-T G.9701 Recommendation ITU-T G.994.1 (2012) Amendment 4 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND
3、CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON 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
4、 LINKS AND INTERCONNECTION WITH METALLIC LINES G.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.
5、999 General G.900G.909 Parameters for optical fibre 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
6、bearers G.940G.949 Digital line systems G.950G.959 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 QUA
7、LITY OF SERVICE AND PERFORMANCE GENERIC AND USER-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-
8、T Recommendations. Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014) i Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers Amendment 4 Additional codepoints for the support of ITU-T G.9701 Summary Amendment 4 to Recommendation ITU-T G.994.1 (2012) covers the following
9、functionalities: Additional codepoints for the support of ITU-T G.9701. Mandatory tone sets for ITU-T G.9701. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.994.1 1999-07-02 15 11.1002/1000/4720 1.1 ITU-T G.994.1 (1999) Cor. 1 2000-04-04 15 11.1002/1000/5139 2.0 ITU-T G.9
10、94.1 2001-02-09 15 11.1002/1000/5364 3.0 ITU-T G.994.1 2002-07-29 15 11.1002/1000/6119 4.0 ITU-T G.994.1 2003-05-22 15 11.1002/1000/6281 4.1 ITU-T G.994.1 (2003) Amd. 1 2004-02-22 15 11.1002/1000/7080 4.2 ITU-T G.994.1 (2003) Amd. 2 2004-06-13 15 11.1002/1000/7351 4.3 ITU-T G.994.1 (2003) Amd. 3 200
11、5-01-13 15 11.1002/1000/7495 4.4 ITU-T G.994.1 (2003) Amd. 4 2006-01-13 15 11.1002/1000/8549 5.0 ITU-T G.994.1 2007-02-13 15 11.1002/1000/8993 5.1 ITU-T G.994.1 (2007) Amd. 1 2007-11-22 15 11.1002/1000/9167 5.2 ITU-T G.994.1 (2007) Amd. 2 2008-04-13 15 11.1002/1000/9388 5.3 ITU-T G.994.1 (2007) Amd.
12、 3 2009-03-22 15 11.1002/1000/9675 5.4 ITU-T G.994.1 (2007) Amd. 4 2009-06-29 15 11.1002/1000/9891 5.5 ITU-T G.994.1 (2007) Amd. 5 2010-04-22 15 11.1002/1000/10415 5.6 ITU-T G.994.1 (2007) Amd. 6 2010-11-29 15 11.1002/1000/11018 5.7 ITU-T G.994.1 (2007) Amd. 7 2011-04-13 15 11.1002/1000/11129 5.8 IT
13、U-T G.994.1 (2007) Cor. 1 2011-10-29 15 11.1002/1000/11417 5.9 ITU-T G.994.1 (2007) Amd. 8 2011-12-16 15 11.1002/1000/11416 6.0 ITU-T G.994.1 2012-06-13 15 11.1002/1000/11644 6.1 ITU-T G.994.1 (2012) Amd. 1 2012-10-29 15 11.1002/1000/11797 6.2 ITU-T G.994.1 (2012) Amd. 2 2013-08-29 15 11.1002/1000/1
14、1994 6.3 ITU-T G.994.1 (2012) Amd. 3 2014-01-13 15 11.1002/1000/12093 6.4 ITU-T G.994.1 (2012) Amd. 4 2014-12-05 15 11.1002/1000/12094 6.5 ITU-T G.994.1 (2012) Amd. 5 2015-02-13 15 11.1002/1000/12373 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your we
15、b browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, informatio
16、n 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 on them with a view to standardizing telecommunications on a worldwid
17、e 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 ITU-T Recommendations is covered by the procedure laid down in WTSA
18、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 used for conciseness to indicate both a telecommunication administra
19、tion 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 the Recommendation is achieved when all of these mandatory provision
20、s 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 of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the
21、 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 Property Rights, whether asserted by ITU members or others outside of
22、 the Recommendation development process. As of the date of approval of this Recommendation, ITU had not 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 i
23、nformation 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 written permission of ITU. Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014)
24、 1 Recommendation ITU-T G.994.1 Handshake procedures for digital subscriber line transceivers: Amendment 4 Additional codepoints for the support of ITU-T G.9701 1) Clause 6.1, Description of signals Modify clause 6.1 as follows: 6.1 Description of signals The signalling families used in this Recomme
25、ndation, and the carrier sets defined within each family, are described in this clause. Each xDSL mode of operation has a mandatory carrier set associated with it. For each xDSL mode of operation implemented by an ITU-T G.994.1 station, the initial ITU-T G.994.1 transmission from the station shall i
26、nclude the associated mandatory carrier set for that mode. NOTE 1 In the interest of explicitly indicating the presence of HSTU-x that might not have common modes, the initial transmission should use as many carriers as possible, and HSTU-x are encouraged to detect all carriers from all signalling f
27、amilies. Both duplex and half-duplex transmission modes are defined for use within this Recommendation. The transmission mode supported is a function of carrier set and is specified in Tables 1 and 3. In some jurisdictions it may be necessary to shape the power of the downstream and upstream carrier
28、s in order to be compliant with PSD masks enforced by regulation. Implementations shall shape the power of the carriers, or disabled carriers as appropriate, to meet in-force regulations or codes of conduct in the jurisdiction where they are deployed. Frequencies other than those specified in Tables
29、 1 and 3 shall not be transmitted simultaneously with ITU-T G.994.1 signals. 2) Clause 6.1.1, 4.3125 kHz signalling family To add tone set for ITU-T G.9701, modify Table 2 as follows: Table 2 Mandatory carrier sets xDSL Recommendation(s) Carrier set designation(s) ITU-T G.992.1 Annex A, ITU-T G.992.
30、2 Annexes A/B, ITU-T G.992.3 Annexes A/I/L, ITU-T G.992.4 Annexes A/I, ITU-T G.992.5 Annexes A/I ITU-T G.993.2 where support of a profile requiring US0 (Note 4) ITU-T G.993.2 with support of Annex B bandplan HPE17 or HPE30 A43 2 Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014) Table 2 Mandatory carrier set
31、s xDSL Recommendation(s) Carrier set designation(s) ITU-T G.992.5 Annexes A/I (Note 1), ITU-T G.992.5 Annexes J/M (Note 2) ITU-T G.993.2 where support of a profile requiring US0 (Notes 1, 4) A43c ITU-T G.992.1 Annex B, ITU-T G.992.3 Annex B, ITU-T G.992.5 Annex B ITU-T G.993.2 where support of a pro
32、file requiring US0 (Note 4) B43 ITU-T G.992.5 Annex B (Note 3) B43c ITU-T G.992.1 Annexes C/H/I, ITU-T G.992.2 Annex C, ITU-T G.992.3 Annex C, ITU-T G.992.5 Annex C ITU-T G.993.2 where support of a profile requiring US0 (Note 4) C43 ITU-T G.992.3 Annexes J/M, ITU-T G.992.5 Annexes J/M J43 (Note 6) I
33、TU-T G.993.1 Using multi-carrier modulation (except Annex C) ITU-T G.993.2 where support of a profile not requiring US0 V43 ITU-T G.993.1 Annex C using multi-carrier modulation over POTS V43P ITU-T G.993.1 Annex C using multi-carrier modulation over ISDN-BA V43I ITU-T G.993.1 Using single-carrier mo
34、dulation over POTS V43P-S ITU-T G.993.1 Using single-carrier modulation over ISDN-BA V43I-S ITU-T G.993.1 Using single-carrier modulation over TCM-ISDN V43-S ITU-T G.9701 (AB43) A43,B43 ITU-T G.9701 (AA43c) A43,A43c NOTE 1 To be used where spectrum management forbids use of the downstream carrier se
35、t A43, typically where ITU-T G.992.5 or ITU-T G.993.2 is deployed from a cabinet. NOTE 2 To be used where spectrum management forbids use of the downstream carrier set J43, typically where ITU-T G.992.5 is deployed from a cabinet. NOTE 3 To be used where spectrum management forbids use of the downst
36、ream carrier set B43, typically where ITU-T G.992.5 is deployed from a cabinet. NOTE 4 At least one of the carrier sets A43, B43, and C43 shall be transmitted, depending on the US0 band supported. NOTE 5 If multimode operation is supported, the HSTU shall transmit the carrier sets corresponding to a
37、ll enabled modes simultaneously. NOTE 6 If ITU-T G.992.3 or ITU-T G.992.5 Annex B is also supported by the HSTU-R, the upstream carrier set J43 shall be optional and it should not be transmitted as it can interfere with ISDN present on the same line. In this case the carrier set B43 shall be transmi
38、tted. In previous versions of Recommendation ITU-T G.994.1, the J43 carrier set was mandatory. Therefore, HSTU-C implementing a previous version of Recommendation ITU-T G.994.1 may not respond appropriately. Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014) 3 3) Clause 9.4, Standard information field (S) Fo
39、r additional codepoints for the support of ITU-T G.9701, modify Table 11.0.4 as follows: Table 11.0.4 Standard information field SPar(1) coding Octet 5 Bits SPar(1)s Octet 5 8 7 6 5 4 3 2 1 x x x x x x x 1 ITU-T G.992.5 Annex M x x x x x x 1 x ITU-T G.993.1/ANSI T1.424 x x x x x 1 x x ITU-T G.993.1
40、Annex I/T1E1 TRQ 12 x x x x 1 x x x Variable silence period (Note) x x x 1 x x x x ITU-T G.992.5 Annex C x x 1 x x x x x ITU-T G.993.2 x 1 x x x x x x ITU-T G.9701 x 0 0 0 0 0 0 0 No parameters in this octet NOTE Setting the bit to binary ONE in an MS message requests a silence period of 10-640 seco
41、nds long, as specified by the variable silence period length field. The station that has invoked the silence period by transmitting MS may terminate the silence period prior to the requested length, by restarting the handshake session (sending activation tones). 4) New clause 9.4.35 Add clause 9.4.3
42、5: 9.4.35 ITU-T G.9701 Par(2)/Par(3) parameters Table 11.69 Standard information field ITU-T G.9701 NPar(2) coding Octet 1 Bits ITU-T G.9701 NPar(2)s Octet 1 8 7 6 5 4 3 2 1 x x x x x x x 1 Reserved for allocation by ITU-T x x x x x x 1 x Reserved for allocation by ITU-T x x x x x 1 x x Support of s
43、pecial probe sequence x x x x 1 x x x Default CE length x x x 1 x x x x Default number of symbol periods in TDD frame. x x 1 x x x x x Reserved for allocation by ITU-T x x 0 0 0 0 0 0 No parameters in this octet 4 Rec. ITU-T G.994.1 (2012)/Amd.4 (12/2014) Table 11.70 Standard information field ITU-T
44、 G.9701 SPar(2) coding Octet 1 Bits ITU-T G.9701 SPar(2)s Octet 1 8 7 6 5 4 3 2 1 x x x x x x x 1 Profiles x x x x x x 1 x Downstream Transmission band x x x x x 1 x x Number of downstream symbol positions in TDD frame x x x x 1 x x x RFI bands (Note) x x x 1 x x x x Duration of Channel Discovery 1-
45、1 x x 1 x x x x x CE lengths x x 0 0 0 0 0 0 No parameters in this octet NOTE The length of the corresponding NPar(3) field is variable and is a multiple of 4 octets (see Table 11.70.4). The length depends on the total number of bands “j“ to be specified. “j“ is the band index (starting from 1). Tab
46、le 11.70.0.1 Standard information field ITU-T G.9701 SPar(2) coding Octet 2 Bits ITU-T G.9701 SPar(2)s Octet 2 8 7 6 5 4 3 2 1 x x x x x x x 1 Number of symbol periods in TDD frame x x x x x x 1 x International amateur radio bands x x x x x 1 x x Scrambler seed x x x x 1 x x x Special probe sequence
47、 (Note 1) x x x 1 x x x x IDS (Note 2) x x 1 x x x x x Number of SOC symbol repetitions (Rs) x x 0 0 0 0 0 0 No parameters in this octet NOTE 1 The length of the corresponding NPar(3) field is variable (see Table 11.70.10). The length is 3 octets if the number of elements of the special probe sequen
48、ce (N) is smaller or equal to 3; the length is 4 octets if N8; the length is 4+86 octets if N8. NOTE 2 The length of the corresponding NPar(3) field is variable (see Table 11.70.11). The length is 6 where L is the length of the IDS. Table 11.70.0.2 Standard information field ITU-T G.9701 SPar(2) cod
49、ing Octet 3 Bits ITU-T G.9701 SPar(2)s Octet 2 8 7 6 5 4 3 2 1 x x x x x x x 1 Number of DS initialization data symbols (sds) x x x x x x 1 x Downstream RMC offset x x x x x 1 x x Reserved for allocation by ITU-T x x x x 1 x x x Reserved for allocation by ITU-T x x x 1 x x x x Reserved for allocation by ITU-T x x 1 x x x x x Reserved for allocation by ITU-T x x 0 0 0 0 0 0 No parameters in this octet
