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ITU-T Rec. T.101 (11/94) International Interworking for Videotex Services

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ITU-T Rec. T.101 (11/94) International Interworking for Videotex Services INTERNATIONAL TELECOMMUNICATION UNION )45 4 4 TELECOMMUNICATION (11/94) STANDARDIZATION SECTOR OF ITU 4%2-).!,3&/24%,%-!4)#3%26)#%3 ).4%2.!4)/.!,).4%27/2+).' &/26)$%/4%83%26)#%3 )45 42ECOMMENDATION4 (Previously “CCITT Recommendation”) FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization 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 No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation T.101 was revised by ITU-T Study Group 8 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 11th of November 1994. ___________________ NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. ITU 1995 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. CONTENTS Page Recommendation T.101 (11/94) Summary.................................................................................................................................................................... x 1 Scope.............................................................................................................................................................. 1 2 Normative references ..................................................................................................................................... 2 3 Abbreviations ................................................................................................................................................. 4 4 Interworking between Videotex services: General ........................................................................................ 4 5 International interworking of Videotex services............................................................................................ 5 5.1 International interworking configurations ........................................................................................ 5 5.2 Gateway to gateway interworking .................................................................................................... 5 5.3 Terminal to host interworking .......................................................................................................... 5 6 International interworking between gateways................................................................................................ 5 6.1 International interworking at network level...................................................................................... 6 6.2 Transport layer.................................................................................................................................. 6 6.3 Session layer ..................................................................................................................................... 6 6.4 Presentation layer.............................................................................................................................. 6 6.4.1 Presentation protocol ........................................................................................................ 6 6.4.2 Coding of Videotex information ....................................................................................... 6 6.5 Application layer .............................................................................................................................. 7 6.6 Relationship with DTAM/ODA........................................................................................................ 7 7 International interworking between a terminal and a host ............................................................................. 8 7.1 Access via PSTN or ISDN bearer service ........................................................................................ 8 7.2 Access via PSPDN or ISDN bearer service......................................................................................9 7.3 Access via PSPDN/PAD................................................................................................................... 9 7.4 Access via PSPDN through a VIU ................................................................................................... 10 7.5 Access via PSPDN through a VSU .................................................................................................. 11 7.6 Application rules for Recommendation X.29 to support administrative functions........................... 11 7.6.1 Charging............................................................................................................................ 12 7.6.2 Limit handling................................................................................................................... 14 7.6.3 Identification..................................................................................................................... 14 7.6.4 Language-Management..................................................................................................... 15 7.6.5 Data-Syntax-Management ................................................................................................ 15 7.6.6 Error-Message................................................................................................................... 15 7.7 Coding .............................................................................................................................................. 15 7.8. ASN.1 encoding of the Administrative commands of Terminal to Host interworking .................... 16 7.9 State table for charging events received at VSU side ....................................................................... 18 7.9.1 Used abbreviations............................................................................................................ 18 7.9.2 State table.......................................................................................................................... 20 7.9.3 Collision............................................................................................................................ 20 8 Content architecture class attributes............................................................................................................... 20 8.1 Content architecture class ................................................................................................................. 20 8.2 Content type...................................................................................................................................... 20 Recommendation T.101 (11/94) i Page 9 Content portion attributes............................................................................................................................... 21 9.1 Type of coding.................................................................................................................................. 21 9.2 Specific coding attributes.................................................................................................................. 21 9.2.1 Subset ............................................................................................................................ 22 9.2.2 Rank ............................................................................................................................ 22 9.2.3 Profile ............................................................................................................................ 22 10 Formal definition of Videotex dependent data type ....................................................................................... 22 10.1 Introduction ...................................................................................................................................... 22 10.2 Summary of ASN.1 object identifiers............................................................................................... 23 11 Common enhancements to data syntaxes I, II and III .................................................................................... 24 11.1 Terminal identifier............................................................................................................................ 24 11.1.1 Terminal identification command response messages ...................................................... 24 11.1.2 Modem capability ............................................................................................................. 25 11.1.3 Audio capabilities ............................................................................................................. 26 11.1.4 Photographic capabilities .................................................................................................. 27 11.2 ISO 9281 support.............................................................................................................................. 28 11.3 Abnormal truncation of data............................................................................................................
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