1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOM M U N I CATI ON STANDARDIZATION SECTOR OF ITU G.992.1 Corrigendum I (1 1/2001) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system - Access networks Asymmetric digital subscriber line (ADS
2、L) transceivers Corrigendum I ITU-T Recommendation G.992. I (1 999) - Corrigendum 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS TRANSMISSION SYSTEMS GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER
3、- INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TESTiNG EQUIPMENTS
4、TRANSMISSION MEDIA CHARACTERISTICS DIGITAL TERMINAL EQUIPMENTS DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM General Parameters for optical fibre cable systems Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s Digital line transmission systems on cable at non-
5、hierarchical bit rates Digital line systems provided by FDM transmission bearers Digital line systems Digital section and digital transmission systems for customer access to ISDN Optical fibre submarine cable systems Optical line systems for local and access networks Access networks G. 1 00-G. 199 (
6、3.200-G.299 (3.3004.399 G.400-G.449 G.450-G.499 G.500-G.599 G.700-G.799 G.800-G.899 G.900-G.999 G .900-G .909 (3.9 10-G.9 19 (3.9204.929 G.600-G.699 G .93 O-G .93 9 (3.9404.949 G.950-G.959 (3.9604.969 G.970-G.979 G.980-G .989 G.99-G.999 For further details, please refer to the list of ITU-T Recommen
7、dations. ITU-T Recommendation 6.992.1 Asymmetric digital subscriber line (ADSL) transceivers CORRIGENDUM 1 Summary The value 110 WZ of the resistance in the CO splitter signature of Figure E.5lG.992.1 is replaced by 33 WZ value. Source Corrigendum 1 to ITU-T Recommendation G.992.1 (1999) was prepare
8、d by IT-T Study Group 15 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 November 2001. ITU-T Rec. G.992.1/Cor.1(11/2001) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunica
9、tion Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tas questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WT
10、SA), 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. In some areas of information technology which fall
11、within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 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 RIG
12、HTS ITU 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, vaiidity or applicability of claimed Intellectual Property Rights, whether asserted by IT
13、 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, implementors are cautioned that this may n
14、ot represent the latest information and are therefore strongly urged to consult the TSB patent database. o ITU 2002 AU rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and micronlm, without permis
15、sion in writing from ITU. ii ITU-T Rec. G.992.1/Cor.l(11/2001) ITU-T Recommendation 6.992.1 Asymmetric digital subscriber line (ADSL) transceivers CORRIGENDUM 1 1) Change Figure E.YG.992.1 to show a 33 ka resistance in the equivalent circuit of the CO splitter signature. Subclause E.2.1.7 (Maintenan
16、ce test signatures) R - CO splitter signature Remote spiitter signature 1N4007 36 V 10% 33 ka 1% I I T Figure E.5/G.992.1- Maintenance test signatures ITU-T Rec. G.992.1/Cor.l(11/2001) 1 SERIES OF ITU-T RECOMMENDATIONS Series A Series B Series C Series D Series E Series F Series G Series H Series I
17、Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z Organization of the work of IU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Ov
18、erall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Cable networks and transmission of television,
19、sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintena
20、nce: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2002
