1、 INTERNATIONAL STANDARD IEC62297-2 First edition2005-05 Triggering messages for broadcast applications Part 2:Transport methods Reference number IEC 62297-2:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering A
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8、 Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC62297-2 First edition2005-05 Triggering messages for broadcast applications Part 2:Transport methods IEC 2005 Copyright-all rights reserved No part of this publication may be rep
9、roduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 9
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11、005(E)CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviations.6 3.1 Terms and definitions.6 3.2 Abbreviations.7 4 Teletext-based methods.7 4.1 Page-format method.7 4.1.1 Maximum length of a trigger message.8 4.1.2 Data stream.8 4.1.3 Transmission a
12、spects.9 4.2 Independent data line method.9 4.2.1 Maximum length of a trigger message.9 4.2.2 Data stream.10 4.2.3 Packet structure.10 5 MPEG-2 transmission-based method.11 Annex A(informative)Code of practice.13 A.1 Page-format teletext transmissions.13 A.2 Independent data line teletext transmissi
13、ons.13 Figure 1 Protocol stack.9 Table 1 Coding of Packet 28/0,format 1.9 Table 2 Coding of the four message bits in the Format Type byte.10 Table 3 Stream Event Descriptor.12 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.62297-2 IEC
14、:2005(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TRIGGERING MESSAGES FOR BROADCAST APPLICATIONS Part 2:Transport methods FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC National
15、Committees).The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in addition to other activities,IEC publishes International Standards,Technical Specifications,Technical Reports,Publicly Availab
16、le Specifications(PAS)and Guides(hereafter referred to as“IEC Publication(s)”).Their preparation is entrusted to technical committees;any IEC National Committee interested in the subject dealt with may participate in this preparatory work.International,governmental and non-governmental organizations liaising with the IEC also participate in this preparation.IEC collaborates closely with the International Organization for Standardization(ISO)in accordance with conditions determined by agreement b
