IEC 62297-2:2005

Triggering messages for broadcast applications - Part 2: Transport methods

IEC 62297-2:2005 specifies how trigger messages are broadcast using teletext technology. Both Page Format-Clear and Independent Data Line methods are defined, using protocols defined in ETSI EN 300 708. This bilingual version (2013-07) corresponds to the monolingual English version, published in 2005-05.

Messages de déclenchement pour les applications de radiodiffusion - Partie 2: Méthodes de transport

La CEI 62297-2:2005 spécifie la façon dont les messages déclencheurs sont diffusés en utilisant la technologie du télétexte. Les deux méthodes, "Page Format - Clear" (Format de page net) et "Independent Data Line" (ligne de données indépendantes) sont définies, en utilisant les protocoles définis dans l'ETSI EN 300 708. La présente version bilingue (2013-07) correspond à la version anglaise monolingue publiée en 2005-05.

General Information

• Status: Published
• Publication Date: 02-May-2005
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Drafting Committee: PT 62297 - TC 100/PT 62297
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jul-2005
• Completion Date: 03-May-2005

Relations

• Replaces: IEC PAS 62297:2002 - Proposal for introducing a trigger mechanism into TV transmissions
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 62297-2
First edition
2005-05
Triggering messages
for broadcast applications –
Part 2:
Transport methods
Reference number
Publication numbering
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60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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INTERNATIONAL IEC
STANDARD 62297-2
First edition
2005-05
Triggering messages
for broadcast applications –
Part 2:
Transport methods
 IEC 2005  Copyright - 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 publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale M
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 62297-2  IEC:2005(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 aspects.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 transmissions .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

62297-2  IEC: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 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 Available 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 between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62297-2 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/911/FDIS 100/950/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 62297-2  IEC:2005(E)
IEC 62297 consists of the following parts, under the general title Triggering messages for
broadcast applications:
Part 1: Format
Part 2: Transport methods
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under http://webstore.iec.ch in the
data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

62297-2  IEC:2005(E) – 5 –
INTRODUCTION
This part of IEC 62297 focuses on the transport methods of the trigger messages defined in
IEC 62297-1.
– 6 – 62297-2  IEC:2005(E)
TRIGGERING MESSAGES FOR BROADCAST APPLICATIONS –

Part 2: Transport methods
1 Scope
This part of IEC 62297 specifies how the trigger messages defined in IEC 62297-1 are
transmitted. A trigger is defined as information sent from a service provider as part of a data
broadcasting transmission that initiates an application in a receiver. Additional information in
the trigger message allows filtering or prioritization techniques to be applied at the receiver.
Examples of possible use include the forcing of the display of information to warn of severe
weather conditions and advising of extreme content in the TV programme. In an interactive
system, a message or icon might be displayed inviting on-line access to vote, to register an
interest in an advertised product, or to browse programme-related content.
This standard specifies how trigger messages are broadcast using teletext technology. Both
Page Format-Clear and Independent Data Line methods are defined, using protocols defined
in ETSI EN 300 708.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 62297-1, Triggering messages for broadcast applications – Part 1: Format
ISO/IEC 13818-6, Information technology – Generic coding of moving pictures and associated
audio information – Part 6: Extensions for DSM-CC
ETSI EN 300 706, Enhanced Teletext specification
ETSI EN 300 708, Data transmission within Teletext
ETSI TS 101 231, Television systems; Register of Country and Network Identification (CNI),
Video Programming System (VPS) codes and Application codes for Teletext based systems
3 Terms, definitions and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions, in singular or plural
form, apply.
3.1.1
Application Data Block
one instance of the application data to be transmitted via the Page Format-Clear method and
following the addition of any error protection/correction data

62297-2  IEC:2005(E) – 7 –
3.1.2
Bundle
group of 490 application bytes for transmission via IDL format B and to which the FEC
algorithm is applied
3.1.3
Bundle Information Structure
data within the stream carried by the Page Format-Clear method that indicates the
applications present in the stream
3.1.4
Data Stream
continuous or periodic sequence of data comprising application and transmission related
components
3.1.5
Hamming 8/4
method of protecting data against transmission path errors. A protection bit is added for every
data bit. Single bit errors per byte can be corrected, two bit errors can be detected
3.1.6
Independent Data Line
teletext packet with address 30 or 31 that does not form part of a teletext page and can be
inserted at any point in the transmission cycle
3.1.7
Page Format-Clear
page-based method of broadcasting serial data streams via teletext when the application does
not require encryption techniques to be applied to the data
3.1.8
Structure Header
data that precedes an Application Data Block to indicate the application to which it belongs
and the size of the block
3.1.9
Trigger message
definition of a trigger event including a URL and optional attributes to specify, for example, a
countdown time and an expire time
3.2 Abbreviations
FEC Forward Error Correction
IDL Independent Data Line
MIP Magazine Inventory Page
URL Uniform Resource Locator
4 Teletext-based methods
4.1 Page-format method
The Page Format-Clear protocol, fully defined in ETSI EN 300 708, is used to transmit one or
more trigger messages. A serial data stream is formed and broadcast via successive versions
of a Page Format-Clear encoded teletext page.

– 8 – 62297-2  IEC:2005(E)
4.1.1 Maximum length of a trigger message
The encoding method and the maximum payload size of the Page Format-Clear protocol limits
the maximum length of a trigger message to 1 022 bytes.
4.1.2 Data stream
A serial data stream a
...

IEC 62297-2 ®
Edition 1.0 2005-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Triggering messages for broadcast applications –
Part 2: Transport methods
Messages de déclenchement pour les applications de radiodiffusion –
Partie 2: Méthodes de transport

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IEC 62297-2 ®
Edition 1.0 2005-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Triggering messages for broadcast applications –

Part 2: Transport methods
Messages de déclenchement pour les applications de radiodiffusion –

Partie 2: Méthodes de transport

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 33.170 ISBN 978-2-8322-0889-2

– 2 – 62297-2  IEC:2005
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 aspects . 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 transmissions . 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

62297-2  IEC:2005 – 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 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 Available 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 between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62297-2 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This bilingual version (2013-07) corresponds to the monolingual English version, published in
2005-05.
The text of this standard is based on the following documents:
FDIS Report on voting
100/911/FDIS 100/950/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 62297-2  IEC:2005
IEC 62297 consists of the following parts, under the general title Triggering messages for
broadcast applications:
Part 1: Format
Part 2: Transport methods
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under http://webstore.iec.ch in the
data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62297-2  IEC:2005 – 5 –
INTRODUCTION
This part of IEC 62297 focuses on the transport methods of the trigger messages defined in
IEC 62297-1.
– 6 – 62297-2  IEC:2005
TRIGGERING MESSAGES FOR BROADCAST APPLICATIONS –

Part 2: Transport methods
1 Scope
This part of IEC 62297 specifies how the trigger messages defined in IEC 62297-1 are
transmitted. A trigger is defined as information sent from a service provider as part of a data
broadcasting transmission that initiates an application in a receiver. Additional information in
the trigger message allows filtering or prioritization techniques to be applied at the receiver.
Examples of possible use include the forcing of the display of information to warn of severe
weather conditions and advising of extreme content in the TV programme. In an interactive
system, a message or icon might be displayed inviting on-line access to vote, to register an
interest in an advertised product, or to browse programme-related content.
This standard specifies how trigger messages are broadcast using teletext technology. Both
Page Format-Clear and Independent Data Line methods are defined, using protocols defined
in ETSI EN 300 708.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 62297-1, Triggering messages for broadcast applications – Part 1: Format
ISO/IEC 13818-6, Information technology – Generic coding of moving pictures and associated
audio information – Part 6: Extensions for DSM-CC
...