1、ITU-T RECNN*T.SO AND*2 96 4862591 0618366 LO9 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.90 Amendment 2 (07/96) SERIES T: TERMINAL EQUIPMENTS AND PROTOCOLS FOR TELEMATIC SERVICES Characteristics and protocols for terminals for telematic services in
2、ISDN Amendment 2 ITU-T Recommendation T.90 - Amendment 2 (Previously CCITT Recommendations) ITU-T RECMN*T-SO AMD*2 96 4862593 Ob38367 045 AMENDMENT 2 TO ITU-T RECOMMENDATION T.90 CHARACTERISTICS AND PROTOCOLS FOR TERMINALS FOR TELEMATIC SERVICES IN ISDN Summary Study Group 8 has agreed to propose am
3、endments to Recommendations T.4 and T.30 to include the optional use of the modulation system defined in Recommendation V.34. Amendment 2 to Recommendation T.90 covers the addition of a Telematics Profile Identifier to distinguish the use of the procedures in Annex Cfl.30, in the analogue mode with
4、the V.34 full-duplex mode from its use in the digital mode in the ISDN environment. Source Amendment 2 to ITU-T Recommendation T.90, was prepared by U-T Study Group 8 (1993-1996) and was approved under the WTSC Resolution No 1 procedure on the 3rd of July 1996. ITU-T RECMN*T.SO AMD*2 76 4862573 0638
5、368 TB1 FOREWORD iTU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. Some 179 member countries, 84 telecom operating entities, 145 scientific
6、 and industrial organizations and 38 international organizations participate in ITU-T which is the body which sets world telecommunications standards (Recommendations). The approval of Recommendations by the Members of ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, 1
7、993). In addition, the World Telecommunication Standardization Conference (WTSC), which meets every four years, approves Recommendations submitted to it and establishes the study programme for the following period. In some areas of information technology which fall within ITU-Ts purview, the necessa
8、ry 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. O ITU 1996 All rights reserved. No part of this publication
9、 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 T.90jAmd.2 (07/96) 1 2 ITU-T RECMN*T*SO AMD*2 96 D 4862573 0618367 938 CONTENTS Introduction . . . , . . . . . . .
10、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . Required changes to Annex F of Recommendation T.90 Page 1 1 . Recommendation T.90lAmd.2 (07196) 1
11、11 ITU-T RECMN*TmSO AMD*2 96 4862571 Ob18370 b3T ._Y.,_“ .,., _. “Y.“- .,I - ITU-T RECMN*T.SO AMD*2 96 4862591 Ob18371 57b Amendment 2 to Recommendation T.90 CHARACTERISTICS AND PROTOCOLS FOR TERMINALS FOR TELEMATIC SERVICES IN ISDN (Geneva, 1996) 1 Introduction Since Annex Cfl.30 provides for the s
12、ending of the XID information field (as defined in Recommendation T.90) in the DIS-DCSDTC interchange, it becomes necessary to distinguish the use of Annex Cfl.30 in analogue mode with V.34 full duplex from its use in digital mode in the ISDN environment. A new TPI, with its associated coding is the
13、refore required to be added to subclauses F.3.1.3fl.90 and F.3.1.4fl.90 to identify this mode of use of Annex CR.30. 2 F.3.1.3 Figure F.4 shows the data format for the Telematics Profile Identifier block. Required changes to Annex F of Recommendation T.90 TO826330-96 FTGURE F.4n.90 Data format for t
14、he Telematics Profile Identifier block Recommendation T.90/Amd.2 (07/96) 1 ITU-T RECMNmT.70 AMDm2 76 M 4862591 Ob38372 402 = TI O000 o001 F.3.1.4 TPI codings LI G3C FAX Identifier LI 0000 O010 o001 O010 0000 0000 TABLE F.4R.90 Telematics Provider Indicator Codings for the TPI block 8 7 6 5 4 3 2 11
15、Content 00000000 00000001 00010000 00010001 00010010 0001001 1 00010100 00010101 1 1 1 1 1 1 1 1 Reserved Terminal Identifier (TI) Reserved G4 G3C FAX Identifier (G3C) (Annex CiT.30 digital mode) G3F FAX Identifier (G3F) (Annex F.4) G3V FAX Identifier (Annex CIT.30 analogue mode. Note) 1 Reserved fo
16、r future extension _ NOTE - G3V identifies analogue transmission using the Annex CIT.30 procedures. Coding example: TPI format for G3C (without parameters) only. FIGURE F.5l.90 Coding example for G3C (without parameters) 2 Recommendation T.90lAmd.2 (07/96) ITU-T RECMN*T.SO AMD*Z 96 m 4862593 Ob38373
17、 349 ITU-T RECOMMENDATIONS SERIES Series A Series B Series C Series D Series E Series F Series G Series H Series I 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 Z Organization of the work of the ITU-T Means of exp
18、ression General telecommunication statistics General tariff principles Telephone network and ISDN Non-telephone telecommunication services Transmission systems and media Transmission of non-telephone signals integrated services digital network Transmission of sound-programme and television signals P
19、rotection against interference Construction, installation and protection of cables and other elements of outside plant Maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound-programme and television transmission
20、 circuits Specifications of measuring equipment Telephone transmission quality Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminal equipments and protocols for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages Printed in Switzerland Geneva, 1996
