IEC PAS 62297:2002

Proposal for introducing a trigger mechanism into TV transmissions

Specifies a triggering scheme for television broadcasting, permitting a service provider to trigger an application in a receiver.

General Information

• Status: Replaced
• Publication Date: 14-Jan-2002
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: WPUB - Publication withdrawn
• Completion Date: 09-Oct-2007

Relations

• Replaced By: IEC 62297-1:2005 - Triggering messages for broadcast applications - Part 1: Format
• Effective Date: 05-Sep-2023
• Replaced By: IEC 62297-2:2005 - Triggering messages for broadcast applications - Part 2: Transport methods
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/PAS 62297
Edition 1.0
2002-01
Proposal for introducing
a trigger mechanism
into TV transmissions
PUBLICLY AVAILABLE SPECIFICATION
INTERNATIONAL Reference number
ELECTROTECHNICAL
IEC/PAS 62297
COMMISSION
GENERAL SECRETARIAT
EACEM Technical Report
TR-037-r01
Title:
Proposal for introducing a trigger mechanism
into TV transmissions
Proposed ETSI Title:
“Specification of a protocol defining remote triggering of data-
broadcast applications”
Proposed ETSI keywords:
“trigger, broadcast, activation, signalling, interactive, data-broadcast”
Date: 23 April 2001
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EACEM - International Association,  Diamant Building,  Bd. A. Reyers 80,  B-1030 BRUSSEL
Phone: [phone]   Fax: [phone]   E-mail: [e-mail]

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
PROPOSAL FOR INTRODUCING A TRIGGER MECHANISM

INTO TV TRANSMISSIONS
FOREWORD
A PAS is a technical specification not fulfilling the requirements for a standard, but made available to the

public and established in an organization operating under given procedures.

IEC-PAS 62297 was submitted by the EACEM (European Association of Consumer Electronics Manufacturers)
and has been processed by IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
100/406/PAS 100/437/RVD
Following publication of this PAS, the technical committee or subcommittee concerned will investigate
the possibility of transforming the PAS into an International Standard.
An IEC-PAS licence of copyright and assignment of copyright has been signed by the IEC and EACEM
and is recorded at the Central Office.
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any divergence
between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the
latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this PAS may be the subject of patent rights.
The IEC shall not be held responsible for identifying any or all such patent rights.
Page i
Version History
This document was drafted by EACEM Project Team 1.4 “Data Broadcasting” and replaces document TP-14-99-16

and all of its versions as outlined below.

Version Date Author Description

0.1 Feb 2000 Jo Vandale Initial 'reworked' version after the TP1.4 meeting in Brussels

0.2 20 July 2000 Jo Vandale Adaptations, EACEM TP1.4 and TeleWeb meeting in Rennes

0.3 8 Aug 2000 Jo Vandale Adaptations during the EACEM TP1.4 meeting in Brugge

0.4 31 Aug 2000 Jo Vandale Minor adaptations during the TeleWeb meeting in Rousset

0.5 11 Sept 2000 Jo Vandale Editorial changes after internal review.
0.6 15 Sept 2000 Jo Vandale Editorial changes after review by David Tarrant. Addition of
Annex C 'Simple trigger protocol for page-format Teletext
(Informative)' by David Tarrant.
0.7 29 Sept 2000 Jo Vandale Removing the 'event-null' and replacing it with 'dummy URL' to
realise the same goal, the ability to display the icon without running
an application.
0.8 11 Oct 2000 Jo Vandale Editorial changes after review by David Tarrant. Addition of the
icon proposal to Annex B (Designed by Bob Vranken, Philips).
1.0 3 Nov 2000 Jo Vandale Released version after review by the TeleWeb Technical Group.
2.0 5 Feb 2001 Jo Vandale Adapting to the new EACEM references.
2.1 / r00 15 Feb 2001 Jo Vandale Adding the new EACEM template (Cover, Header, Footer, …)
3.0 / r01 23 April 2001 Jo Vandale Adding the minor changes requested by Jorg Polkowski
+ meeting remarks EACEM Project Team 1.4

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Contents
1 Scope . 5

2 References . 5

3 Definitions, Abbreviations and Conventions. 5

3.1 Definitions and Tokens. 5

3.2 Abbreviations. 7

4 Trigger message. 7
4.1 General. 7
4.1.1 Viewer interaction . 7
4.1.2 Priority ratings . 8
4.1.3 Character coding. 8
4.1.4 Future compatibility. 8
4.2 Lifecycles. 8
4.2.1 The trigger message and event message lifecycle. 8
4.2.2 The event message preparation lifecycle . 9
4.2.3 The application lifecycle. 10
4.3 Trigger format. 11
4.3.1 Trigger text length . 12
4.3.2 Trigger text . 12
4.3.3 Trigger repetition . 16
Annex A Requirements (Informative). 17
Annex B Code of Practice (Informative) . 18

B.1 Time reference. 18
B.2 Modifying triggers. 18
B.3 Trigger expiry. 18
B.4 Countdown values . 18
B.5 Initial state . 18
B.6 Multiple sources . 18
B.7 Receivers not supporting concurrent ApplicationObject instances . 18
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B.8 Receivers supporting concurrent ApplicationObject instances . 19

B.9 The ICON bitmap . 19

B.10 The use of priority . 19

B.11 Interaction of name and script attributes. 20

B.12 Supporting multiple applications. 20

Annex C Simple trigger protocol for page-format Teletext (Normative) . 21

C.1 Introduction . 21

C.2 Trigger Message page. 21
C.3 Coding of packets X/27 . 21
C.4 Allocation of packet X/27 links. 21
C.5 Receiver actions. 21

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1 Scope
Existing data broadcasting specifications do not allow a service provider to trigger an application in a receiver. This

document specifies a triggering scheme for TV broadcasting based on the requirements defined in Annex A. Examples

of possible use include displaying information to warn of severe weather conditions and advising of extreme content in

TV programmes. 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.

For the purposes of this document a trigger is defined as information sent from a service provider as part of a data

broadcasting transmission and intended to control an application in a receiver. Additional information can be supplied

along with the basic trigger to allow filtering or prioritisation techniques to be applied at the receiver. The transmission
aspects of trigger m essages are specified in [1].

Annex C describes a simple method for triggering the display of a Teletext page from within a standard page-format
Teletext transmission.
2 References
[1] EACEM TR-038: "Trigger Transport Layers"
[2] ISO, ISO-8859-1: “Information processing – 8-bit single byte-coded graphic character sets, Latin alphabets”.
[3] IETF, RFC 1738 (1994): "Uniform Resource Locators".
[4] ETSI, TR 101 231: "Television Systems; Register of Country and Network Identification (CNI) and of Video
Programming System (VPS) codes".
[5] ETSI, ETS 300 706: "Enhanced Teletext Specification".
[6] EACEM TR-047: “TeleWeb Application Part 2 Profile 1 Enhanced".
[7] ATVEF, "Enhanced Content Specification", v1.1 r26.
[8] ECMA, ECMA Standard 262, "ECMAScript Language Specification".
[9] IETF, RFC 791 (1981): "Internet Protocol".
[10] IETF, RFC 1071 (1988): "Computing the Internet checksum".
3 Definitions, Abbreviations and Conventions

3.1 Definitions and Tokens
For the purpose of this document the following terms and definitions apply, in singular or plural form:
ActiveTimeValue A member of the ApplicationObject. The value decrements at video frame rate. It is
updated on every reception of an event message.
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application Software running on a receiver that is addressed by th
...