ITU-T G 992 2 AMD 1-2003 Splitterless asymmetric digital subscriber line (ADSL) transceivers Amendment 1 Revised Annex C SERIES G TRANSMISSION SYSTEMS AND MEDIA DIGITAL SYSTEMS ANDy.pdf
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1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.992.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(03/2003) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Access networks Splitterless asymmetric digital subscriber line (AD
2、SL) transceivers Amendment 1: Revised Annex C ITU-T Recommendation G.992.2 (1999) Amendment 1ITU-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-
3、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.400G.449 COORDINATION OF R
4、ADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA 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
5、 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.959 Digital sectio
6、n 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 Access networks G.990G.999 QUALITY OF SERVICE AND PERFORMANCE G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.600
7、0G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.992.2 (1999)/Amd.1 (03/2003) i ITU-T Recommendation G.992.2 Splitterless asymmetric digital subscriber line (ADSL) transceivers Amendmen
8、t 1 Revised Annex C Summary This Amendment 1 to ITU-T Rec. G.992.2 revises Annex C for improved robustness and extended reach. It includes the changes introduced by G.992.2 (1999) Corrigendum 1 (07/2002). Source Amendment 1 to ITU-T Recommendation G.992.2 (1999) was prepared by ITU-T Study Group 15
9、(2001-2004) and approved under the WTSA Resolution 1 procedure on 16 March 2003. ii ITU-T Rec. G.992.2 (1999)/Amd.1 (03/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardizatio
10、n 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 World Telecommunication Standardization Assembly (WTSA), which meets
11、 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. In some areas of information technology which fall within ITU-Ts pu
12、rview, 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 recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws at
13、tention 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 Property Rights, whether asserted by ITU members or oth
14、ers 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, implementors are cautioned that this may not represent th
15、e latest information and are therefore strongly urged to consult the TSB patent database. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.992.2 (1999)/Amd.1 (03/2003) iii CONTENTS Page C.1
16、 Scope 1 C.2 Definitions and abbreviations. 1 C.3 Reference models . 2 C.4 Operating modes (new) 6 C.5 ATU interfaces . 7 C.6 ATU functional characteristics (pertains to clause 7) 7 C.7 aoc on-line adaptation and reconfiguration (pertains to clause 9) 14 C.8 In-service performance monitoring and sur
17、veillance (pertains to clause 10). 15 C.9 Initialization 16 C.10 Fast retraining (supplements clause 12) . 36 C.11 Power management (pertains to clause 13) 41 Appendix IV Example Overlapped PSD Masks for use in a TCM-ISDN crosstalk environment 41 ITU-T Rec. G.992.2 (1999)/Amd.1 (03/2003) 1 ITU-T Rec
18、ommendation G.992.2 Splitterless asymmetric digital subscriber line (ADSL) transceivers Amendment 1 Revised Annex C ADSL above POTS co-existing in the same binder as TCM-ISDN DSL C.1 Scope This annex describes those specifications that are unique to an ADSL system co-existing in the same binder as T
19、CM-ISDN as defined in Appendix III/G.961. The subclauses in this annex provide the additions and modifications to the corresponding clauses in the main body. The modifications described in this annex provide a performance improvement over the Splitterless ADSL system specified in main body in an env
20、ironment co-existing with TCM-ISDN. It is preferred that ADSL system implementing this annex also implements the main body. This annex defines several optional operating modes or “profiles“, negotiable through G.994.1, to allow limited independent control of: FEXT and NEXT period transmission in bot
21、h upstream and downstream directions overlapped and non-overlapped spectrum downstream during FEXT and NEXT periods These new optional profiles (defined in C.4 as Profiles 1 to 6) offer improved robustness and extended reach compared to the previously defined operating modes. NOTE References to figu
22、res or tables of Appendix IV will be defined when Appendix IV is made available. C.2 Definitions and abbreviations C.2.1 Definitions C.2.1.1 Dual Bitmap: The Dual Bitmap method has dual bit rates under the FEXT and NEXT noise from TCM-ISDN. C.2.1.2 FEXT Bitmap: Similar to the Dual Bitmap method; how
23、ever, transmission only occurs during FEXT noise from TCM-ISDN. C.2.1.3 Hyperframe: Five Superframes structure which synchronized TTR. C.2.1.4 Bitmap-FR: ATU-C transmitter bitmap under TCM-ISDN FEXT noise generated at ATU-R. C.2.1.5 Bitmap-NR: ATU-C transmitter bitmap under TCM-ISDN NEXT noise gener
24、ated at ATU-R. C.2.1.6 Bitmap-FC: ATU-R transmitter bitmap under TCM-ISDN FEXT noise generated at ATU-C. C.2.1.7 Bitmap-NC: ATU-R transmitter bitmap under TCM-ISDN NEXT noise generated at ATU-C. C.2.1.8 FEXTRduration: TCM-ISDN FEXT duration at ATU-R estimated by the ATU-C. 2 ITU-T Rec. G.992.2 (1999
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