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1、BRITISH STANDARD BS EN 50157-2-1:1997 Domestic and similar electronic equipment interconnection requirements: AV. link Part 2-1: Signal quality matching and automatic selection of source devices The European Standard EN 50157-2-1:1996 has the status of a British Standard ICS 33.160.30; 33.160.40 Lic
2、ensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50157-2-1:1997 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 e
3、ffect on 15 April 1997 BSI 01-1999 The following BSI references relate to the work on this standard: Committee reference EPL/100/3 Draft for comment 93/215007 DC ISBN 0 580 26465 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Co
4、mmittee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/3, Equipment and systems in the field of audio, video and audiovisual engineering, upon which the following bodies were represented: Association of British Theatre Technicians Audio Engineering Society Britis
5、h Broadcasting Corporation British Educational Suppliers Association British Federation of Audio British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Federation of the Electronics Industry Independant Television Association (ITVA) Institute of Sound and Com
6、munication Engineers Institution of Electrical Engineers International Association of Broadcasting Manufacturers Professional Lighting and Sound Association Royal Institute of British Architects Royal National Institute for Deaf People Society of Cable Television Engineers Amendments issued since pu
7、blication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50157-2-1:1997 BSI 01-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 50157-2-13 List of referencesIns
8、ide back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50157-2-1:1997 ii BSI 01-1999 National foreword This British Standard has been prepared by Subcommittee EPL/100/3 and is the English language version of EN 50157-2-1:1996 D
9、omestic and similar electronic equipment interconnection requirements: AV. link Part 2-1: Signal quality matching and automatic selection of source devices, published by the European Committee for Electrotechnical Standardization (CENELEC). When EN 50157-1 is published by CENELEC it will be implemen
10、ted as BS EN 50157-1. 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. Cross-references Pu
11、blication referred toCorresponding British Standard EN 50049-1:1989BS 6552:1990 Specification for domestic and similar electronic equipment. Interconnection requirements: peritelevision connector Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ti
12、tle page, pages 2 to 22, 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 front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+0
13、0:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50157-2-1 April 1996 ICS 33.160.30; 33.160.40 Descriptors: Television systems, peritelevision devices, appliance interconnections, audiovisual materials, characteristics, electrical properties, mechanical prop
14、erties, signals, inspection, measurements English version Domestic and similar electronic equipment interconnection requirements: AV. link Part 2-1: Signal quality matching and automatic selection of source devices Spcification des interconnexions des quipements lectroniques domestiques et usage ana
15、logue: AV. link Partie 2-1: Adaptation de la qualit du signal et selection automatique des quipements sources Kennwerte fr die Kleinsignalverbindung zwischen elektronischen Gerten fr den Heimgebrauch und hnliche Anwendungen: AV link Teil 2-1: Qualitatives Anpassen von Signalen und automatisches Ausw
16、hlen von Signalquellen This European Standard was approved by CENELEC on 1995-07-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lis
17、ts and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the r
18、esponsibility 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 electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
19、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels
20、1996 Copyright reserved to CENELEC members Ref. No. EN 50157-2-1:1996 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50157-2-1:1996 BSI 01-1999 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 203, E
21、lectronic entertainment and educational systems for household and similar use. The text of the draft was submitted to formal vote and was approved by CENELEC as EN 50157-2-1 on 1995-07-04. The structure of the AV. link chain concept, the way of introducing new socket and plug connectors and new cord
22、-sets, the use of the logo, and the recommended application information and corresponding chain and device requirements are given in EN 50157-1, Domestic and similar electronic equipment interconnection requirements: AV. Link Part 1: General NOTEEN 50157-1 is currently under the CENELEC approval pro
23、cedure. Specific types of AV. link are described in different Parts 2 of the EN 50157 series. This Part 2-1 contains items related to the signal quality matching and automatic selection of source devices. The following dates were fixed: Philips electronics N.V. is willing to grant non-exlusive, non-
24、transferable licences on fair, reasonable and non-discriminatory terms and conditions under its registered trademark AV.LINK and under any of its patent rights, under which it has the free right to grant licences and to the extent necessary to comply with this standard, for use in devices that fully
25、 perform in accordance with this standard to any third party which has or will submit an equivalent undertaking with respect to this standard. Contents Page Introduction3 1Scope3 2Normative references3 3The chain principle3 4Field of application5 5Rules of conformity to the chain5 6Characteristics o
26、f the interconnections7 7Characteristics of the control signal12 8Control signal specification12 9Contact 7 direction conflict15 10Special application cases16 11Control signal line arbitration and error handling17 Figure 1a Signal path interconnection Chain principle4 Figure 1b Signal path interconn
27、ection Chain principle, minimum configuration5 Figure 2 Example of multi chain configuration6 Figure 3 Input/out configuration for control bus18 Figure 4 Message frames with minimum gap19 Figure 5a Start bit pulse format19 Figure 5b Data bit pulse formats19 Figure 6 Bit sequence of a frame20 Figure
28、7 Data bit timing21 Figure 8 Timing for contact 7 conflict avoidance22 Table 1 Signals to be connected in the equipment8 Table 2 Characteristics of the interconnections9 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorse
29、ment(dop) 1996-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1996-07-01 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50157-2-1:1996 BSI 01-19993 Introduction Reasons for the establi
30、shment of this Part 2-1 Part 2-1 of the AV.link defines the basic structure of the AV.link standard. Within this Part 2-1 a control signal line at contact 10 is introduced to have the possibility for automatic bi-directional signal quality matching of the AV signals and automatic selection of active
31、 source devices. This Part 2-1 describes the signals which are changed with respect to the existing standard EN 50049-1 to have the capability to fulfil automatic signal quality matching and source selection in a bi-directional way. By introducing automatic signal quality matching the need for bette
32、r means of interconnection was established, therefore in Part 1, EN 50157-1, basic patterns for a new plug-connector and socket-connector and a related cord-set are introduced. The backwards compatibility to existing connectors in accordance with EN 50049-1 has been maintained by the introduction of
33、 the new cord-set. Further, to be able to guarantee this quality to the user, recommended system and device requirements are defined which can be found in EN 50157-1 as well. 1 Scope This standard specifies an extension (with the possibility to start with only two devices as a point-to-point interco
34、nnection (only a Display unit combined with a low end VTR) and then building it up) towards a chain configuration (serial interconnection of devices) with respect to the existing CENELEC Standard EN 50049-1 which specifies only the characteristics of the point-to-point interconnection system for aud
35、iovisual equipment. This standard defines the interconnection characteristics of peri-television devices which are configured in the chain principle. This standard makes use of a control signal at contact 10 which gives the possibility for automatic source de-selection and quality matching of AV-sig
36、nals. This standard describes the AVC-signals in line with EN 50049-1:1989/A3:1995. This standard gives system and device oriented requirements which have to be fulfilled if use is made of the logo related to this standard. Within this standard the AV.link logo is defined to ensure towards the custo
37、mer a certain signal quality. This standard defines the basics for new (socket and plug) connectors and a corresponding cord-set to be able to guarantee the signal quality. This standard guarantees a backwards compatibility towards existing equipment with the interconnection system based on EN 50049
38、-1. This standard gives the possibility to have a bi-directional interconnection of Y0/C0 signals. This standard gives the possibility to have a bi-directional control of the aspect ratio of 16 : 9 and 4 : 3. 2 Normative references This standard refers to EN 50049-1:1959 and its relationship to othe
39、r standardization documents. In this Part 2-1 all existing and future amendments to EN 50049-1 or future editions of EN 50049-1 are taken into account. 3 The chain principle The chain configuration is characterized by: 1) Serial interconnection of devices (see Figure 1a). The simplest chain consists
40、 of two devices (see Figure 1b). For adding an AV device, only an extra cord-set is needed. The customer has to be informed that the number of devices in one chain is limited due to “a decreased quality level of the AV-signals”, if too many devices (more than six) are connected. 2) Independent simul
41、taneous actions on the up-stream and the down-stream path, e.g. the possibility of simultaneous display of one AV device acting as a source and the recording of another AV device acting as a second source. 3) Availability of simple control signals, among others to match the signal quality level of A
42、V devices acting as a source and AV devices acting as a destination. 4) Bi-directional interconnection of Y0/C0 signals. Simultaneous use of RGB and Y0/C0 is not possible. 5) Bi-directional interconnection of Aspect Ratio information (16 : 9 and 4 : 3). 6) Backwards compatibility with a type of equi
43、pment which fulfils EN 50049-1 with respect to Audio, CVBS, RGB display signals and Function Switching (slow switching) Voltage with an eventual superimposed remote control signal. 7) Backwards compatibility with a type of equipment which fulfils EN 50049-1 with respect to the C0-signal (of Y0/C0) o
44、n contact 15 and the Aspect Ratio control signal on contact 8. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50157-2-1:1996 4 BSI 01-1999 8) Easy interconnection between any of two devices in the chain, e.g. to copy from VCR 1 to VCR 2.
45、 9) The possibility to connect a Display Unit which fulfils EN 50049-1 at the top of the chain and a type of equipment (AV device) which fulfils EN 50049-1 at the tail of the chain. In this case the automatic control functions do not work. Backwards compatibility in the chain with AV devices which f
46、ulfils EN 50049-1 is only possible with improved quality cables. The use of cables in accordance with EN 50049-1 is prevented by mechanical means. In the introduction phase of products in accordance with EN 50157-1 it is allowed to start with connectors and the cord-set marked type U in accordance w
47、ith EN 50049-1. 10) The possibility to connect at the tail of the chain one “tail AV device”, which is provided with the control signal but only has one connector and no loop-through switching. Figure 1a Signal path interconnection Chain principle Licensed Copy: sheffieldun sheffieldun, na, Mon Nov
48、06 07:56:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50157-2-1:1996 BSI 01-19995 It only is possible to connect one “EN 50049-1” or “tail AV.link” AV device to the bottom of the chain. 11) Distribution of the extra costs for the system features over the system-prepared AV devices, so costs only
49、 have to be paid if they really can be used. 4 Field of application 4.1 This standard applies to the connector sockets type I and type II, mounted on the Display Unit (only connector type 1) and on the AV devices connected to the chain-type audiovisual system. It includes the designation of contacts, the type of signals and the electrical matching values. 4.2 This standard applies to the plugs fitted to both ends of the cord-set. 4.3 It covers the interconnection cord-set itself (type of conductors, wiring). This cord-
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