1、 STD=BSI BS EN 50203-ENGL 1777 D 1b24bb9 Ob31075 ATO D BRITISH STANDARD Automatic channel installation (ACI) * * vi The European standard EN 50203 : 1996, including Amendment Al : 1997, has the status of a British Stanard ICs 33.160.20 BS EN 50203 : 1997 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS P
2、ERMITTED BY COPYRIGKT LAW BS EN 60203 : 1997 AmdNo. This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1997 O BSI 1997 Date Text affected Committees responsi
3、ble for this British Standard The preparation of this British Standard was entrusted by Technid Committee EPIA, Audio, video and multimedia systems and equipment, to Subcommittee EPU100/1, Receiving equjpment, upon which the following bodies were represented: British Broadcasting Corporation British
4、 Educational Suppliers Association British Radio and Electronic Equipment Manufaturem Association British Telecommunications pic Radiocommunications Agency Radio Society of Great Britain The foliowing BSI references relate to the work on this standard: Committee reference EPL100/1 Draft for comment
5、96B00596 DC ISBN O 580 27692 9 - STD-BSI BS EN 50203-ENGL 1997 E Lb24bb7 Ob31097 b73 W BS EN 50203 : 1997 Contents Committees responsible National foreword page Inside front cover ii Foreword Text of EN 50203 2 4 O BSI 1997 1 National foreword This British Standard has been prepared by Subcommittee
6、EPU100/1, and is the English hgmge version of EN 50203 : 1996 including Amendment Al : 1997, published by the European Committee for Electrotechnical StandarWon (CENELEC). This British Standard is published under the direction of the Electrotechnical Sector Board whose Technical Committee EPU100 has
7、 the responsibili to: - aid enquirers to understand the text; - present to the responsible internationaLEuropean committee any enquines on the interpretation, or proposals for change, and keep the TJK interests informed; - monitor related international and European developments and promulgate them i
8、ntheuK. NOTE. International and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises
9、a front cover, an inside hnt cover, pages i and ii, the EN title page, pages 2 to 26, an inside back cover and a back cover. ii O BSI 1997 EUROPEAN STANDARD NO= EUROPENNE EXJROP- NORM EN 50203 +Al December 1996 February 1997 ICs 33.1o.20 Descriptors: Television receivers, magnetoscopes, transmission
10、 channels, adjustment, teletext., remote control, iwation English version Automatic channel iry 5 i j;i %ex) - the characters on columns 38 and 39 which shall contain the checkword characters (see sub-clause 3.3.3) used for error protection. 1 In case the cable network needs more room than is availa
11、ble on one page, an extension page number shall be added, The extension page number (not for Multi-package) is located directly before the six stop characters at columns 5, 6 and 7. If no extension page is available, then the extension page number is represented by FFF. Within an extension page the
12、described protocol shall be repeated for the remaining data. Page 7 EN 50203:199 Reserved pages according to the Teletext Specification (see =CEM TR No. 8) should not be used as AC1 extension pages. Examples: 1BE (AC11 1FO (TOP) XFE :MOT) XFF (Closing page header) 1F8 (ISTL) 1F9 (IST1) XFD (MIPI 3.
13、System row The data of row 1, following the start characters contains information for the used system parameter- dues 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
14、 dependent alternative page numbers can be found. The details of the system row are: Column Row O 1 - I Start characters E = / - - - e System characters * * m N V C Page characters I LL O 1 2 3 0123456789012345678901234567890123456789 i/NVCILLpppSSpppTTpppXXpppWppp*+uxx c System row t Header Start o
15、f Unique TXT Page protocol. Network-type symbol (see table 3) Version symbol (see table 2) Coding-type symbol (see table 4) Function-ID symbol (see table 5) Default language code of the current Unique TXT Page Other language codes supported by the service. Page number belonging to another Unique TXT
16、 page in another language than the default language code. Unused characters (for future use) Up-date indicator (see note i): ASCII character O up to and including 9. Default: *. (All other appearances shall be regarded as transmission errors) NOTE: This parameter can be used by cable operators to in
17、dicate that the cable configuration has been changed. The TV or VCR can detect whether there is up-dated AC1 data by comparing the Up-date indicator as supplied by the AC1 pages and the Up-date indicator in the non volatile memory of the TV or VCR, which was stored during the last time the-TV or VCR
18、 was installed. If the two Up-date indicators differs, then new AC1 data is available. (see table 6) RR, ss, TT, xx, YY : PPP *%* U xx Checkword charaners (coding-type dependent) TO allow future extensions a version symbol is apecified. On row l8 column 3 one character is used for the version symbol
19、. See table 2. This document describes the version characterized by symbol I. Version ASCII After Version symbol Description symbol (Hex) Hamming Decoding I 49 2 Only ASCII coded. Protocol for AC1 and d 64 4 Reserved for future use. 8 38 6 decoe al1 these version symbols as 1 2F 7 version 1. P 50 8
20、Reserved for future use. G 47 9 Decoders set up for version 1 shall I 21 12 react on these version symbols. PDC (Program Delivery Control) shall nnFnAarri raC - U- -a- s 73 5 -riu .I- Lc LW 711 en8 39- - In the Teletext Service label it is allowed to use one or more daft are characters, which have t
21、o be represented by 3. *? may be used to indicate an RF carrier with Teletext Service but any matching is valid. Two special representations of the Teletext Service label are defined : 1) in case the channel has no teletext service the Teletext 2) in case the channel has no RF carrier the Teletext S
22、ervice placed (column 26) in order to make the remaining data of that Service label LU contains %O. label LLL contains I-. - All selections shall be checked top down. 6. Twext trgnnmission reauirements I. Xn the preceding chapters detafhsU fzfrinatfon has been given about the detection and decoding
23、of the Unique TXT Page. This chapter describes characteristics of the Unique TXT Page, important for the originator (broadcaster-type). - The first Unique TXT Page has always page number 1BE and is always ASCII coded. - Two characters of the header, anywhere in the area of columns 8 up to and includ
24、ing 31, shall be identical accelerator characters. - If the teletext transmission is in serial mode, then the accelerator characters shall be available in all headers. - If the teletext transmission is in parallel mode, then the accelerator characters shall be available in all headers of magazine I.
25、 - The Unique TXT Page shall be transmitted in a repeated way of maximum 20 seconds. - It is not allowed that in one Teletext service more than one version is used. - ASCII coded Hex numbers are always in uppercase. - The cable operator shall ensure that unique selection digits are used for each cit
26、y name within the multi-package. Note : All characters represented by * may not be used by today teletext decoders. STD-BSI BS EN 50203-ENGL 1777 Lb24bb7 Ob3LLL7 271 W Page 19 EN 50203:1996 Equipment using AC1 may be marked with one of the symbols given in annex F. Copyright of these symbols is owne
27、d by Philip8 Electronics NV. This organization freely grants permission to use these symbols to all manufacturers of AC1 equipment to be used on equipment conforming to this specification, in whole or in part, and upon literature and packaging relating to such products. Rof ormaam Ref. 1 : Teletext
28、specification (625 line television systems),Interim Technical Document SPB 492, European Broadcasting Union, December 1992, Geneva * * IB STD*BSI BI EN 5UZUl-ENGL 1997 Lb24bb9 Ob31118 128 Page 20 EN 50203:1996 Appendix A Example page (fixed format) (informative) Appendix B Example page (variable tex
29、t format) (informative) k Q) c, k I- clf O STDnBSI BS EN 50203-ENGL 1997 W Lb24bb7 Ob31120 BAb page 22 EN 5Mo3:1996 Appendix C Example page (multi package format) (informative) STDmBSI BS EN 50203-ENGL 1777 H Lb24bb9 lb31121 7L2 Page 23 EN 5ou)3:199 n 4 u E O w E 4 Y h 4 a Y a u u 9 k 2 u CI w u 2 P
30、 X ri- co m“a o c o) al k k a 8 O 4J a o) 1 W ri # E m n x iii X c I4 N al o o c o c al al k k a B O o 3 8 page 24 EN 50203:1996 Appendix E Code table Hamming 4/8 (informative) A B 1 1 O O Source code Hexadaclnal Decimal notation notation C D interpretation information U 1 O b8 wrong corncted 1 1 no
31、 enor rCCcpt6d I I O O I 1 I 1 2 2 5 5 6 6 7 7 a a I 9 l 9 Channml codo Binary notation Hexadecimal information bit. not at ion I I I z z z I Protect ion bit a b7 = b8 8 b6 8 b5 = b6 6, b4 6, b2 O = Exclusive Or b3 = Fax: 0181 996 7400. BSI offers members an individual updating service called PLUS w
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