1、BRITISH STANDARD BSEN 50203:1997 Automatic channel installation (ACI) The European Standard EN50203:1996, including AmendmentA1:1997, hasthestatus of a British Standard ICS 33.160.20BSEN50203:1997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, wa
2、s published underthe authority of the Standards Board and comesintoeffect on 15August1997 BSI09-1999 The following BSI references relate to the work on this standard: Committee reference EPL/100/1 Draft for comment96/200596 DC ISBN 0 580 27692 9 Committees responsible for this British Standard The p
3、reparation of this British Standard was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/1, Receiving equipment, upon which the following bodies were represented: British Broadcasting Corporation British Educational Suppliers Associ
4、ation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Radiocommunications Agency Radio Society of Great Britain Amendments issued since publication Amd. No. Date CommentsBSEN50203:1997 BSI 09-1999 i Contents Page Committees responsible Inside front cov
5、er National foreword ii Foreword 2 Text of EN 50203 5BSEN50203:1997 ii BSI 09-1999 National foreword This British Standard has been prepared by Subcommittee EPL/100/1, and is the English language version of EN50203:1996 including AmendmentA1:1997, published by the European Committee for Electrotechn
6、ical Standardization (CENELEC). This British Standard is published under the direction of the Electrotechnical Sector Board whose Technical Committee EPL/100 has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on
7、the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI,389 Chiswick High
8、 Road, London W44AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Thi
9、s document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside fro
10、nt cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN50203 December1996 +A1 February1997 ICS 33.160.20 Descriptors: Television receivers, magnetoscopes, transmission channels, adjustment, teletext, remote control, installation English version Automatic channel installation (ACI) (includesame
11、ndmentA1:1997) Installation automatique des canaux (ACI) (inclut lamendementA1:1997) Automatische Kanalzuordnung (ACI) (enthlt nderungA1:1997) This European Standard was approved by CENELEC on1996-07-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate th
12、e conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exist
13、s in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electr
14、otechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Elec
15、trotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN50203:1996+A1:1997EEN50203:1996 BSI 09-1999 2 Foreword This European Standard was prepared by the Technical Committee CENELEC T
16、C206, Broadcast receiving equipment. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN50203 on1996-07-02. The following dates were fixed: Foreword to EN50203:1996/A1:1997 This amendment was prepared by the Technical Committee CENELEC TC206, Broadcast receiving
17、equipment. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendmentA1 to EN50203:1996 on1997-02-15. The following dates were fixed: IPR Statement “Philips Electronics N.V. hereby declares that it is willing to grant non-exclusive, non-transferab
18、le licences under its patent rights, both granted and pending and owned by Philips Electronics N.V. or by one of its subsidiaries, to the extent Philips Electronics N.V. and its subsidiaries are free to license said patent rights and to the extent said patent rights cover features prescribed by the
19、European Standard EN50203:1996 for Automatic channel installation, to any third party who wishes to obtain such licenses at fair and reasonable terms on a non-discriminatory basis, for use in systems fully complying with said adopted Standard and provided that such third party obtaining such license
20、s from Philips Electronics N.V. is free to license and agrees to license Philips Electronics N.V. and its subsidiaries under the patent rights, which such third party may have or obtain and to the extent they cover features prescribed by said Standard on no less favourable non-discriminating terms a
21、nd conditions.” latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1997-06-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow)1997-06-01 latest date by which the amen
22、dment has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1997-10-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow)1997-10-01EN50203:1996 BSI 09-1999 3 Contents Page Foreword 2 1 Introd
23、uction 5 2 Unique TXT page 5 2.1 Page number of the “Unique TXT Page” 5 2.2 Accelerator characters 5 2.3 Protocol 6 2.3.1 Start characters 6 2.3.2 Stop characters 6 2.3.3 Extension page 6 3 System row 7 3.1 Version symbol 8 3.2 Network-type symbol 8 3.3 Coding-type symbol 8 3.3.1 ASCII characters 9
24、3.3.2 Hamming 9 3.3.3 Checkword 9 3.4 Function-ID symbol 9 3.5 Page language code 10 3.6 Other language codes 10 4 Single-package mode 10 4.1 Fixed format 11 4.2 Variable text format 11 4.3 Preset number 12 4.4 Frequency10 12 4.5 Preset Name 12 4.6 Information data 12 4.6.1 System information 13 4.6
25、.2 Programme guide page number 13 5 Multi-package mode 13 6 Teletext transmission requirements 15 7 Marking of equipment 15 Appendix A (informative) Example page(fixedformat) 16 Appendix B (informative) Example page(variabletext format) 17 Appendix C (informative) Example page(multipackage format) 1
26、8 Appendix D (informative) Code table ASCIIcharacters 19 Appendix E (informative) Code table Hamming4/8 20 Page Appendix F (informative) Logo Artwork Inside back cover Table 1 Accelerators characters 5 Table 2 Version symbols 8 Table 3 Network-type symbols 8 Table 4 Coding-type symbols 9 Table 5 Fun
27、ction-ID symbols 9 Table 6 Page language codes 10 Table 7a Cable and terrestrial GHz frequencies 12 Table 7b Satellite GHz frequencies 12 Table 8 Information data 12 Table 9 TV sound or Radio systems 13 Table 10 ASCII characters 19 Table 11 Hamming code4/8 204 blankEN50203:1996 BSI 09-1999 5 1 Intro
28、duction This document specifies elements and describes characteristics for remote channel-installation of TV and VCR sets, by use of teletext. Nowadays a lot of broadcasted programmes are available for consumers and in the future a considerable increase is to be expected. Hence, programming a TV or
29、VCR is a tedious job. The specification described in this document makes the channel installation of a TV or VCR as simple as possible, if the consumer is connected to a cable network which supplies a so called “Unique TXT Page” installed by the cable operator. The “Unique TXT Page” contains the mac
30、hine readable preset contents of that cable network, and if the TV or the VCR of the consumer is equipped with a decoder in accordance with the below described algorithm, the channel installation of that TV or VCR will be executed fully automatically. 2 Unique TXT Page The “Unique TXT Page” is a pag
31、e in a teletext transmission. It is called unique because of three characteristics: the page has a unique page number, the header of the teletext service contains two non visible “Accelerator characters” and the data in the page is arranged in accordance with a specified protocol. Examples of the la
32、y-out of a “Unique TXT Page” are given in Appendix A, Appendix B and Appendix C. 2.1 Page number of the “Unique TXT Page” The page number of the “Unique TXT Page” is chosen to be a hexadecimal (Hex) page number. The first “Unique TXT Page” has by default the page number “1BE” and is always ASCII cod
33、ed. The use of hexadecimal page numbers for Automatic Channel Installation (ACI) normally prevents uncontrolled access by users and it does not reduce the page capacity of the teletext service. 2.2 Accelerator characters To allow fast determination of the possible availability of the “Unique TXT Pag
34、e” in the total number of delivered channels, “Accelerator characters” are defined. The fast determination is performed by the use of two special identical individual characters in the header of each teletext page (row0) of the selected channel with the “Unique TXT Page”. These two characters are ca
35、lled special because they are not visible for the user and their function is not relevant to the teletext system when used in a header. The selected channel is not necessarily originated by the cable operator but can be delivered by a satellite or terrestrial broadcaster. Dependent on the type of br
36、oadcaster, different “Accelerator characters” are defined. A list of “Accelerator character” codes to be used by the originator of the teletext service is given in Table 1. Table 1 Accelerator characters The broadcaster-type is defined as the broadcaster of origin. Conversion to another transport me
37、dium will not change the “Accelerator characters” in the header of each page, but will be indicated by the “network type character” in the system row (see sub-clause3.2). Originator Broadcaster-type “Accelerator character” ASCII character (Hex) TXT symbol Cable Satellite Terrestrial 09 0C 19 steady
38、normal height contiguous Example: If a broadcaster transmits a “Unique TXT Page” which can be received terrestrially as well as via cable then “contiguous”(19Hex) shall be used.EN50203:1996 6 BSI 09-1999 The two “Accelerator characters” within the header shall be identical and may be placed on any f
39、ree position within column8 up to and including31. In this document “$” is used to represent “steady”(09Hex), see Appendix A, Appendix B and Appendix C. In reality the viewer will not see the “Accelerator characters” in the teletext headers. 2.3 Protocol The “Unique TXT Page” contains data about for
40、 instance the cable network channel allocation. This data is arranged in accordance with the protocol version “I”(49Hex) described hereafter. Certain characters with a well defined meaning are used on specified fixed positions (see Appendix D for the applied teletext character set). The protocol sta
41、rts the “Unique TXT Page” with a “system row” on row “1”. It opens with “start characters“ and closes with “stop characters”. The data on row “1” after the “start characters“, contains data for interpretation of the “Unique TXT Page”. Preset related data starts on row2 and continues until the “stop
42、characters”. 2.3.1 Start characters The “Unique TXT Page” starts with a “Conceal” character(18Hex), followed by a “/”(2FHex). These characters are positioned on row1 respectively at column0 and1. In this document “” is used to represent “Conceal”(18Hex). 2.3.2 Stop characters The last six characters
43、 of the protocol of the “Unique TXT page”, are defined as the “stop characters” represented by “!”(21Hex). The position of these characters can be on any row except row0 and1. These “stop characters” can be found on columns813. The six “stop characters” are preceded by three characters representing
44、a possible “extension or default page number”. The unused positions preceding and following the “stop characters” within the last row of the protocol shall be filled with “unused characters” represented by “*”(2AHex) with the exception of: the character on column0 which shall contain the “conceal” c
45、haracter(18Hex) and the characters on columns38 and39 which shall contain the “checkword characters” (see sub-clause3.3.3) used for error protection. 2.3.3 Extension page In case the cable network needs more room than is available on one page, an “extension page” number shall be added. The “extensio
46、n page number” (not for Multi-package) is located directly before the six “stop characters” at columns5,6 and7. If no extension page is available, then the “extension page number” is represented by “FFF”. Within an extension page the described protocol shall be repeated for the remaining data. U: Pa
47、ge units as defined in Ref.1 T: Page tens S: Sub-code C: Control character x: Area for teletext service name and “Accelerator characters” t: Time display In case of a serial teletext transmission the “Accelerator characters” shall be implemented in the header of each page. In case of a parallel tele
48、text transmission the “Accelerator characters” shall be implemented in all headers of magazine1 EN50203:1996 BSI 09-1999 7 Reserved pages according to the Teletext Specification (see EACEM TR No.8) should not be used as ACI extension pages. 3 System row The data of row1, following the “start charact
49、ers” contains information for the used system parameter-values and the page parameter-values. This concerns information necessary to determine how the page is coded, by whom it is supplied, in which language it is written and where more language dependent alternative page numbers can be found. The details of the system row are: NOTEThis parameter can be used by cable operators to indicate that the cable configuration has been changed. The TV or VCR can detect whether there is up-dated ACI data by comparin
