BS-EN-50494-2007.pdf
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1、BRITISH STANDARD BS EN 50494:2007 Satellite signal distribution over a single coaxial cable in single dwelling installations The European Standard EN 50494:2007 has the status of a British Standard ICS 33.060.30; 33.160.01 ? Licensed Copy: London South Bank University, London South Bank University,
2、Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 50494:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007 ISBN 978 0 580 57057 5 National foreword This British Standard is the UK implementation
3、of EN 50494:2007. The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include a
4、ll the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank Uni
5、versity, Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 50494 NORME EUROPENNE EUROPISCHE NORM October 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Nor
6、mung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50494:2007 E ICS 33.060.30; 33.160.01 English version Satellite signal distribution over a single coaxial cable i
7、n single dwelling installations Distribution de signaux satellites sur un seul cble coaxial dans les rsidences individuelles Signalverteilung von Satellitensignalen ber ein einziges koaxiales Kabelverteilnetz This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to
8、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 lists and bibliographical references concerning such national standards may be obtained on application to the Central
9、 Secretariat or to any CENELEC member. This European Standard exists in two official versions (English, 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 o
10、fficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portu
11、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 50494:2007 - 2 - Foreword This European Standard was prepared by the Techn
12、ical Committee CENELEC TC 206, Consumer equipment for entertainment and information and related sub-systems. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50494 on 2007-03-01. The following dates were fixed: latest date by which the EN has t
13、o be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 _ Licensed Copy: London South Bank University, London South Bank University
14、, Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI - 3 - EN 50494:2007 Contents Introduction5 1 Scope .5 2 Normative references.6 3 Acronyms and definitions .6 3.1 Acronyms6 3.2 Definitions.7 4 System architecture .7 5 SCIF control signals.10 5.1 DC levels 10 5.2 Method of the data bit
15、 signalling.11 5.3 Structure of the DiSEqC message in the single coaxial cable system .11 6 Structure and format of the DiSEqC messages 12 6.1 DiSEqC addressesl12 6.2 Normal operation.12 6.2.1 ODU_Channel_change .13 6.2.2 ODU_PowerOFF 14 6.3 Special modes.14 6.3.1 Installation, SCIF parameters recog
16、nition 14 6.3.2 ODU_UBxSignal_ON16 6.3.3 ODU_Config 16 6.3.4 ODU_LoFreq17 7 Look-up tables and conventions17 7.1 UB slots numbering .17 7.2 Input banks numbering 18 7.3 Config_Nb table 18 7.4 LoFreq table19 8 Traffic collision management rules20 9 Optional extension of the single cable distribution
17、to the multi-dwelling installations 22 9.1 Extension for multi-dwelling installations.22 9.2 Extensions for structure and format of the DiSEqC messages 23 9.3 Specific commands for installation (see 6.3.1 to 6.3.4) 23 9.4 Installation with manual entry of the system parameters, PIN code handling .24
18、 9.5 SDU and MDU compatibility rules.25 Annex A (informative) Implementation guidelines 26 A.1 Installation impedance .26 A.2 Installation: signal reflection and returned loss26 A.3 Power supply of the SCIF.27 A.4 Tuning word calculation, software recommendations .28 A.5 RF scanning, RF tone recogni
19、tion, SCIF parameter recognition29 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 50494:2007 - 4 - Figures Figure 1 General architecture of the single cable distribution .6 Figure 2 General system operation
20、 and UB slot frequency mapping .8 Figure 3 Installation example, system with two UB slots 9 Figure 4 Installation example implementing a monobloc LNB with four UB slots 9 Figure 5 Example of a switcher with two outputs serving six UB slots each.10 Figure 6 Outlines of the signal sent by the receiver
21、 .11 Figure 7 Bit signalling according to DiSEqC format11 Figure 8 DiSEqC command structure 12 Figure 9 Example of signal structure delivered by the SCIF featuring four UB slots after an ODU_UBxSignal_ON.16 Figure 10 DiSEqC command collision between two receivers and recovery system .21 Figure 11 Ps
22、eudo random delay generation for the repeat operation 22 Figure 12 Example of signal spectrum delivered by a SCIF (with MDU option) after an ODU_UbxSignal_ON (or an ODU_UbxSignal_ON_MDU ) command .24 Figure A.1 Solution for masking the impedance of the installation during the DiSEqC commands.26 Figu
23、re A.2 Implementation of an external power supply .27 Figure A.3 Example of a RF spectrum found after an ODU_UBxSignal_ON.29 Tables Table 1 Automatic installation sub-functions15 Table 2 UB slot numbering.17 Table 3 Input bank numbering 18 Table 4 Config_Nb table 18 Table 5 Local oscillation (LO) ta
24、ble in Standard RF (Conventional RF ) 19 Table 6 Local oscillation (LO) table in Wide band RF.19 Table 7 Expected system behaviour .25 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 20 02:50:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI - 5 - EN 50494:2007 Introdu
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