IEC INTERNATIONAL STANDARD 62297-2 First edition 2005-05 Triggering messages for broadcast applications Part 2: Transport methods IEC Reference number IEC 62297-2:2005(E) Copyright Intemational Electrotechnical Commission without license from IHS Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEc is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively,to the base publication, the base publication incorporating amendment 1and the base publication incorporating amendments 1 and 2. FurtherinformationonIEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to this.publication, including itsvalidity, is available in the IEc Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also available from the following: IEc Web Site (www.iec.ch) Catalogue of IEC publications The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to search by a variety of criteria including text searches, technical committees and date of publication. On-line information is also available on recently issued publications, withdrawn and replaced publications,as well as corrigenda. IEC Just Published This summary of recently issued publications (www.iec.ch/online news/ justpub) is also available by email. Please contact the Customer Service Centre (see below) for further information. CustomerServiceCentre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: [email protected] Tel: +4122 919 0211 Fax: +4122 919 03 00 Copyright Intemational Electrotechnical Commission ted without license from IHS IEC INTERNATIONAL STANDARD 62297-2 First edition 2005-05 Triggeringmessages forbroadcastapplications Part 2: Transport methods @IEC 2005—Copyright -all rights reserved mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: [email protected]: www.iec.ch M IEC PRICECODE Commission Electrotechnique Internationale International Electrotechnical Commission MexayHapoAHagSnekTpoTexHyeckagKomwcCMg Forprice, see current cafalogue Copyright Intemational Electrotechnical Commission without ficense from IHS 62297-2@IEC:2005(E) 2 CONTENTS FOREWORD INTRODUCTION Scope 2 Normative references .6 Terms, definitions and abbreviations 3 3.1Terms and definitions 6 3.2Abbreviations... 4 Teletext-based methods.. 4.1 Page-format method 4.1.1 Maximum length of a trigger message 4.1.2 Data stream.. 4.1.3 Transmissionaspects. 4.2 Independent data line method. 4.2.1 Maximum length of a trigger message 4.2.2 Data stream.. 10 4.2.3 Packet structure 10 5 MPEG-2transmission-based method AnnexA(informative)Codeof practice. 13 A.1Page-formatteletexttransmissions .13 A.2Independentdata lineteletexttransmissions 13 Figure1-Protocol stack Table1-CodingofPacket28/0,format1 Table 2-Coding of the four message bits in the Format Type byte. Table3-StreamEventDescriptor 12 - 3 - 62297-2IEC:2005(E) INTERNATIONALELECTROTECHNICALCOMMISSION TRIGGERINGMESSAGESFORBROADCASTAPPLICATIONS- Part 2: Transport methods FOREWORD 11 all national electrotechnical committees (IEC National Committees). The object of IEC is topromote Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). .Their