SIST EN 300 708 V1.2.1:2003

Television systems; Data transmission within Teletext

The former EACEM Project Team 1.4 (Data Services), the originator of the ETSI standard ETS 300 708, prepared some corrections and additions. The most significant addition is a new format of independent data line (IDL) (format B) which contains a forward error correcting (FEC) protocol rather than a cyclic redundancy check (CRC) as used with the current format A.  The requirements for this new packet are described in detail in EACEM technical report TR-039. The details are given in document J23d06, submitted to the 23rd meeting of JTC Broadcast.

Televizijski sistemi – Prenos podatkov v sistemu Teletext

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.050.30 - Equipment for telex, teletext, telefax
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 708 V1.2.1 (2003-04) - Television systems; Data transmission within Teletext

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Televizijski sistemi – Prenos podatkov v sistemu TeletextTelevision systems; Data transmission within Teletext33.170Televizijska in radijska difuzijaTelevision and radio broadcasting33.050.30Oprema za teleks, teletekst, telefaksEquipment for telex, teletext, telefaxICS:Ta slovenski standard je istoveten z:EN 300 708 Version 1.2.1SIST EN 300 708 V1.2.1:2003en01-december-2003SIST EN 300 708 V1.2.1:2003SLOVENSKI
STANDARD



SIST EN 300 708 V1.2.1:2003



ETSI EN 300 708 V1.2.1 (2003-04)European Standard (Telecommunications series) Television systems;Data transmission within Teletext European Broadcasting Union Union Européenne de Radio-Télévision EBU·UER
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Reference REN/JTC-TTEXT-DT-R1 Keywords broadcasting, data, Teletext, TV ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: [phone]
Fax: [phone]
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: [e-mail] Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2003. © European Broadcasting Union 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 708 V1.2.1:2003



ETSI ETSI EN 300 708 V1.2.1 (2003-04) 3
Contents Intellectual Property Rights.6 Foreword.6 1 Scope.7 2 References.7 3 Definitions and abbreviations.7 3.1 Definitions.7 3.2 Abbreviations.8 4 Page Format - Clear.9 4.1 Introduction.9 4.1.1 General points.9 4.1.2 Advantages.9 4.1.3 Disadvantages.9 4.2 Data streams.10 4.2.1 Application data blocks.10 4.2.2 Structure Header.10 4.2.3 Bundle Information structure.11 4.2.3.1 Format.11 4.2.3.2 Structure Header.11 4.2.3.3 Checksum.12 4.2.3.4 Number of Applications.12 4.2.3.5 Application Type.12 4.3 Coding of the Teletext page.12 4.3.1 Page header.12 4.3.1.1 Page number.13 4.3.1.2 Subcode.13 4.3.1.3 Control bits C4 to C14.14 4.3.1.4 Data Bytes.14 4.3.2 Packets 1 to 25.14 4.3.2.1 Valid packets.14 4.3.2.2 Packet encoding.14 4.3.2.3 Block Separator.15 4.3.2.4 Block Pointer.15 4.3.2.5 Filler Byte.15 4.3.2.6 Mapping.15 4.3.2.7 Byte coding.16 4.3.3 Packet 28.16 4.3a Page Transmission.16 4.4 Coding of the packets.17 4.4.1 Page header.17 4.4.2 Packets 1 to 25.19 4.4.2.1 Transmission order.19 4.4.2.2 The Structure Header (SH).20 4.4.2.3 Packing the data into the pages.20 4.4.3 Packet 28.21 4.5 Providing a service according to Page Format - Clear.21 4.5.1 General points on Page Format - Clear.21 4.5.2 Encoding scheme for electronic data transmission.22 5 Page Format - CA.22 5.1 General points.22 5.2 Advantages.22 5.3 Disadvantages.22 5.4 Method of coding.22 5.4.1 Teletext page data.23 SIST EN 300 708 V1.2.1:2003



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5.4.1.1 Scrambled Data Pages.24 5.4.1.2 Pages containing Reformatted Data.24 5.4.2 The Page Key Packet.24 5.4.2.1 Service Mode bits.25 5.4.2.2 Service Identification.25 5.4.2.3 Continuity and Repeat Indicators.26 5.4.2.4 Packet Flags.26 5.4.2.5 Data Length.26 5.4.2.6 Scrambling Method.26 5.4.2.7 The Cyclic Redundancy Check (CRC) word.27 5.4.3 Terminal Equipment Addressing Pages.27 5.4.3.1 System Key Packet.27 5.4.3.2 Shared User Packets.28 5.4.3.3 Unique User Packets.28 5.4.3.4 Service/Page Link packets.29 5.4.3.5 Link to Independent Data Line Services.29 5.5 Security of Page Format - CA.29 5.5.1 Cipher feedback algorithm.30 5.5.2 One-way function.30 5.5.3 Text scrambling.31 6 Independent Data Lines (IDL).31 6.1 General points.31 6.2 Advantages.31 6.3 Disadvantages.31 6.4 Methods of coding.32 6.4.1 Designation code.32 6.4.1.1 Transmission multiplexing.32 6.4.2 Data Channel addressing.32 6.5 IDL Format A.33 6.5.1 Format Type (FT).33 6.5.2 Interpretation and Address Length (IAL).33 6.5.3 Service Packet Address (SPA).34 6.5.4 Repeat Indicator (RI).34 6.5.5 Continuity Indicator (CI).34 6.5.6 Data Length (DL) byte.34 6.5.7 User Data Group.35 6.5.7.1 Dummy bytes.35 6.5.8 Cyclic Redundancy Check (CRC) word.35 6.5.8.1 Check word generation.35 6.5.8.2 Check result.35 6.5.9 Transmission sequence.36 6.6 Datavideo format.36 6.6.1 Packet address.36 6.6.2 Control Bytes (CB).36 6.6.2.1 Packet Continuity Indicator (CI).36 6.6.3 Masking indicator.36 6.6.4 Packet type indicator.37 6.6.5 User data group.37 6.6.6 Cyclic Redundancy Check (CRC) word.37 6.6.6.1 Check word generation.37 6.6.6.2 Check result.37 6.7 Low bit-rate audio.37 6.7.1 Method of coding.38 6.7.1.1 Decoder action.38 6.7.2 Programme-related audio service.38 6.7.2.1 Service Byte (SB).38 6.7.2.2 Control Byte (CB).38 6.7.2.3 Audio data.39 6.7.3 Programme independent audio service.39 6.7.3.1 Service Byte (SB).39 6.7.3.2 Control Byte (CB).39 SIST EN 300 708 V1.2.1:2003



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6.7.3.3 Audio data.39 6.8 IDL Format B.39 6.8.1 Packet structure.39 6.8.1.1 Format Type.40 6.8.1.2 Application Identifier.40 6.8.1.3 Continuity Index.40 6.8.1.4 User Data.40 6.8.1.5 FEC.40 6.8.2 Forward Error Correcting algorithm.41 6.8.2.1 Introduction.41 6.8.2.2 Encoding.41 6.8.2.3 Calculating FEC suffix bytes.41 6.8.2.4 Decoding.42 6.8.2.5 Detecting and correcting single byte errors.42 6.8.2.6 Correcting data blocks.43 6.8.3 Effective data rate.43 7 IDL - CA (type A).43 7.1 General points.43 7.2 Advantages.43 7.3 Disadvantages.44 7.4 Methods of coding.44 7.4.1 Block Separator.44 7.4.2 Block Formats.44 7.4.3 Block Format A.44 7.4.3.1 Block Types.44 7.4.3.2 Primary Block Key Messages.45 7.4.3.3 Secondary Block Messages and Scrambled User Data.45 7.4.3.4 System-Key Message Block.45 7.4.3.5 Shared-User Message Block.45 7.4.3.6 Unique User Message Block.46 7.4.3.7 Service Address Message Block - Independent Data Service.46 7.4.3.8 Service Address Message Block - Link to Page Format - CA.46 Annex A (informative): Additional information for Page Format - Clear.47 A.1 Use of Block Pointer, Block Separator and Block Length information.47 History.48
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Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This European Standard (Telecommunications series) has been produced by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members' activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: [phone] Fax: [phone]
National transposition dates Date of adoption of this EN: 11 April 2003 Date of latest announcement of this EN (doa): 31 July 2003 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 January 2004 Date of withdrawal of any conflicting National Standard (dow): 31 January 2004
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1 Scope The present document describes the various ways in which Teletext may be used to carry non-Teletext services. It should be used in conjunction with EN 300 706 [1]. An example is fully described in EN 300 707 [2]. The present document includes additional practical information on implementing a data service of this type. Hooks into existing Teletext services may be provided from within the application which is carried as a non-Teletext service. A data broadcast application may be pointed to from the Magazine Inventory Page (MIP) or it may be allocated a specific page number. A Code of Practice (CoP) shall ensure that services destined for the consumer may be found quickly by "low-end" Teletext decoders but this is outside the scope of the present document. There are two methods available for carrying data services. The first method carries the data within Teletext pages. The data in these pages is not suitable for direct display by a Teletext decoder and shall normally be allocated a special page number and/or have the display inhibited. The second method carries the data within Independent Data Lines (IDL) and these are independent of the page service. With both Page and IDL formats there exist versions which offer Conditional Access (CA). There are other specific IDL data services which have been defined but it is beyond the scope of the present document to cover all of these. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. •
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