1、INTERNATIONAL TELECOMMUNICATION UNION ITUWT TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU VA20 Corrigendum I (05199) SERIES V: DATA COMMUNICATION OVER THE TELEPHONE NETWORK Interworking with other networks Support by an ISDN of data terminal equipment with V-series type interfaces with provision f
2、or statistical mu Itiplexing Corrigendum 1 ITU-T Recommendation V. 120 - Corrigendum 1 (.Previously CCIlT Recommendation) STDoITU-T RECMN V.320 CORR L-ENGL L999 m 4b259L ObbbL74 L3T W ITU-T V-SERIES RECOMMENDATIONS DATA COMMUNICATION OVER THE TELEPHONE NETWORK General Interfaces and voiceband modems
3、 Wideband modems Error control Transmission quality and maintenance v.1-v.9 V. 1 0-V. 34 v.35-v.39 v.40-v.49 v.50-v.59 II Simultaneous transmission of data and other signals V.60-V.99 11 Interface layer specifications for data communication V.2O-V.249 Control procedures Modems on digital circuits V.
4、250-V.299 V.300-V.399 For further details, please refer to TU-T List of Recommendations. ITU-T RECOMMENDATION V.120 SUPPORT BY AN ISDN OF DATA TERMINAL EQUIPMENT WITH V-SERIES TYPE INTERFACES WITH PROVISION FOR STATISTICAL MULTIPLEXING CORRIGENDUM 1 Source Corrigendum 1 to ITU-T Recommendation V.120
5、 was prepared by ITU-T Study Group 16 (1 997-2000) and was approved under the WTSC Resolution No. 1 procedure on 27 May 1999. Recommendation V.120ICor.l (05199) 1 FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU
6、Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The 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 Stan
7、dardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution
8、No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation the term recognized operating agency (ROA) includes any individual, company, corporation or governmental organi
9、zation that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation
10、may involve the use of a claimed Intellectual Property Right. The 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 Recommendation development process. As of the date of approval
11、of this Recommendation, the ITU had not 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 the latest information and are therefore strongly urged to consult the TSB p
12、atent database. O ITU 2000 All 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 microfilm, without permission in writing from the ITU. 11 Recommendation V.lZO/Cor.l (0999) _ - STD-ITU-T RECMN
13、VmLZD CORR 1-ENGL 1999 W 4Bb2591 0bbb377 949 m Recommendation V.120 SUPPORT BY AN ISDN OF DATA TERMINAL EQUIPMENT WITH V-SERIES TYPE INTERFACES WITH PROVISION FOR STATISTICAL MULTIPLEXING CORRIGENDUM 1 (Geneva, 1999) 1) Subclause 6.3.2.4.5 Amend 6.3.2.4.5, Low layer compatibility, as follows: User r
14、ate (octet 5a) Bits 54321 O O O O O Unspecified Other rates are coded according to Recommendation 4.93 1. Modem type (octet 54 Bits 6-1 are coded according to Recommendation 4.93 1. . Recommendation V.120/Cor.l (05/99) 1 STDmITU-T RECMN V.320 CORR L-ENGL 3999 4862593 0666378 885 i j I I - “.“ “ -.I“
15、 l.l I . - . . - . .I ._ .-l_lll-_ _ _-_ II-_-_ eries A eries B eries C eries D eries E ,cries F leries G ;cries H ieries I ;cries 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 ITU-T RECOMMENDATIONS SERIES Org
16、anization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems
17、and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside pl
18、ant TMN and network maintenance: international transmission systems, telephone circuits telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installati
19、ons, 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, 2000
