1、BRITISH STANDARD BS EN 50083-10:2002 Cable networks for television signals, sound signals and interactive services Part 10: System performance for return paths The European Standard EN 50083-10:2002 has the status of a British Standard ICS 33.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIT
2、TED BY COPYRIGHT LAWBS EN 50083-10:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 18 April 2002 BSI 18 April 2002 ISBN 0 580 39512 X
3、 National foreword This British Standard is the official English language version of EN 50083-10:2002. It supersedes BS EN 50083-10:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, which
4、has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under t
5、he section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appli
6、cation. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
7、international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 30, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document
8、 was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50083-10 NORME EUROPENNE EUROPISCHE NORM March 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnisch
9、e Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50083-10:2002 E ICS 33.060.40 Supersedes EN 50083-10:1999 English version Cable networks for television sign
10、als, sound signals and interactive services Part 10: System performance for return paths Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 10: Caractristiques des systmes de voie de retour Kabelnetze fr Fernsehsignale, Tonsigna
11、le und interaktive Dienste Teil 10: Rckkanal-Systemanforderungen This European Standard was approved by CENELEC on 2001-10-01. 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 stand
12、ard 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 exists in three official versions (English, French, German). A version in any othe
13、r 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 electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland,
14、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50083-10:2002 - 2 - Foreword This European Standard was prepared by CENELEC Technical Committee TC 209, “Cable networks for television signals, sound s
15、ignals and interactive services“ on the basis of EN 50083-10:1999 and the first amendment to EN 50083-10. The text of this first amendment was submitted to the Unique Acceptance Procedure and was approved by CENELEC on 2001-10-01 to be published as part of a second edition of EN 50083-10. The follow
16、ing dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-10-01 Annexes designated “
17、normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, Annex B is normative and Annexes A and C are informative. _- 3 - EN 50083-10:2002 ContentsPage 1 Scope. 4 1.1 General 4 1.2 Specific scope of this part 10. 4 2 Normativ
18、e references . 5 3 Terms, definitions, symbols and abbreviations . 6 3.1 Terms and definitions 6 3.2 Symbols. 8 3.3 Abbreviations. 9 4 Methods of measurement 10 4.1 Setup of the network. 10 4.2 Measurement of signal level . 12 4.3 Measurement of amplitude response variation . 13 4.5 Measurement of m
19、ultiple interference. 16 4.6 Measurement of impulse noise. 17 4.7 Measurement of echo ratio. 18 4.8 Measurement of group delay variation 19 4.9 Measurement of frequency error 19 4.10 Measurement of Bit Error Rate (BER) 20 5 System performance requirements 22 5.1 Introduction. 22 5.2 Analogue paramet
20、ers influencing system performance 23 5.3 General requirements. 24 5.4 Specific system performance requirements 24 6 System performance recommendations 25 6.1 Proposal for the use of the return path bandwidth . 25 Annex A (informative) System performance requirements for differentmodulation techniqu
21、es. 27 Annex B (normative) Correction factors for noise 28 Annex C (informative) Bibliography. 30EN 50083-10:2002 - 4 - 1 Scope 1.1 General Standards of EN 50083 series deal with cable networks for television signals, sound signals and interactive services including equipment, systems and installati
22、ons for headend-reception, processing and distribution of television and sound signals and their associated data signals, and for processing, interfacing and transmitting all kinds of signals for interactive services using all applicable transmission media. All kinds of networks like CATV-networks M
23、ATV-networks and SMATV-networks individual receiving networks and all kinds of equipment, systems and installations installed in such networks, are within this scope. The extent of these standardisation work is from the antennas, special signal source inputs to the headend or other interface points
24、to the network up to the system outlet or the terminal input, where no system outlet exists. The standardisation of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals etc.) as well as of any coaxial and optical cables and accessories therefor is excluded. 1.2 Specific scope o
25、f this part 10 This standard is dealing with the transparent return path of cable networks operated in the frequency range between 5 MHz and 65 MHz or parts thereof. Higher frequencies may be used in fibre based networks. NOTE In addition it is possible to use the frequency range from 0 MHz to 5 MHz
26、 for return path transmissions, e.g. for NMS or other control, monitoring and signalling purposes. Applications below 5 MHz are not covered by this standard. An active return path carries typically only return signals. A passive return path can be used for both return and forward signals. This stand
27、ard lays down the basic methods of measurement for signals typically used in the return path of cable networks in order to assess the performance of those signals and their performance limits. All requirements refer to the performance limits which shall be obtained between the reference points (Figu
28、re 1) of the return path system. One reference point is the network termination close to the subscriber. It is the last point where all forward and return signals are present and carried on the same cable. If no network termination point exists, the reference point is the system outlet.- 5 - EN 5008
29、3-10:2002 The other reference point is the input of the return signal receiver (or transceiver). At this point the transparent signal path ends and behind this point the signal is treated in a non-transparent way. The return signal receiver can be situated at the headend but can also be at the node
30、of the coaxial cell or at any other point of the network. TV E O Network termination Reference point Figure 1 - Reference points of an active return path system (example) In addition to the system performance requirements for the transparent return path, system performance recommendations were laid
31、down in this standard e.g. for the overall frequency allocation, for the use of specific modulation techniques for different interactive multimedia services or for different sub-bands within the return path frequency range, etc. Specific equipment installed in cable networks for the operation of suc
32、h return paths is standardised in the relevant equipment standards, parts 3 to 6 of the EN 50083 series. Transmission systems are not within the scope of this standard. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. Thes
33、e normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undate
34、d references, the latest edition of the publication referred to applies. EN 50083 Cable networks for television signals, sound signals and interactive services EN 50083-1 + A1 + A2 1993 1997 1997 Part 1: Safety requirements EN 50083-2 2001 Part 2: Electromagnetic compatibility for equipment EN 50083
35、-3 2002 Part 3: Active wideband equipment for coaxial cable networks EN 50083-4 1998 Part 4: Passive wideband equipment for coaxial cable networksEN 50083-10:2002 - 6 - EN 50083-5 2001 Part 5: Headend equipment EN 50083-6 1997 Part 6: Optical equipment EN 50083-7 1996 Part 7: System performance + A1
36、 2000 EN 50083-8 2002 Part 8: Electromagnetic compatibility for networks ES 200 800 V1.3.1 2001 Digital Video Broadcasting (DVB); DVB interaction channel for Cable TV distribution systems (CATV) 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions 3.1.1 amplitude response variat
37、ion peak-to-peak variation in frequency amplitude response of a specified signal path over a specified frequency band, expressed in dB 3.1.2 broadcast signal signal comprising of video and/or audio and/or data content which is distributed to several receivers simultaneously 3.1.3 channel availabilit
38、y percentage of the time during which the channel fulfils all performance requirements. The duration of the observation time has to be published 3.1.4 downstream direction direction of signal flow in a cable network from the headend or any other central point (node) of a cable network to the subscri
39、bers area 3.1.5 forward path (downstream) part of a cable network by which signals are distributed in the downstream direction from the headend or any other central point (node) of a cable network to the subscribers area 3.1.6 frequency error quality of supply evaluated on the basis of the actual fr
40、equency of an electrical system compared to the nominal value. Frequency error consists of initial error, short term and long term frequency stability 3.1.7 headend equipment which is connected between receiving antennas or other signal sources and the remainder of the cable network, to process the
41、signals to be distributed NOTE The headend may, for example, comprise antenna amplifiers, frequency converters, combiners, separators and generators.- 7 - EN 50083-10:2002 3.1.8 hybrid fibre coaxial network (HFC) cable network which is comprised of optical equipment and cables and coaxial equipment
42、and cables in different parts 3.1.9 impulse noise noise which is caused by electromagnetic interference into cable networks. Impulse noise is characterised by pulses with a duration of typically 10 s 3.1.10 ingress noise noise which is caused by electromagnetic interference into cable networks. Its
43、power decreases with increasing frequency. It is permanently present but slowly varies in its intensity as a function of time 3.1.11 interaction path part of a cable network by which interactive signals are transmitted in the downstream direction (from the headend or node to the subscriber) and in t
44、he upstream direction (from the subscriber to the headend or node) 3.1.12 location specific noise noise which occurs at a specific area of a cable network or which occurs in a cable network located in a specific environment 3.1.13 multiple interference interfering signal which consists of 2 signals
45、which originate from 2 sources NOTE On return path the multiple interference consists of ingress noise and intermodulation distortion products. 3.1.14 multimedia signal signal comprising of two or more different media contents e.g. video, audio, text, data, etc. 3.1.15 network management system (NMS
46、) software based system for controlling and supervising cable networks 3.1.16 network segment part of a cable network comprising a set of functions and/or a specific extent of the complete cable network 3.1.17 network termination electrical termination of a cable network at any outlet on subscribers
47、 side and headend or node side 3.1.18 node central point of a network segment at which signals could be fed into the forward path or could be gathered from a number of subscribers out of the return pathEN 50083-10:2002 - 8 - 3.1.19 return path (upstream) part of a cable network by which signals are
48、transmitted in the upstream direction from any subscriber, connected to the network, to the headend or any other central point (node) of a cable network 3.1.20 upstream direction direction of signal flow in a cable network from a subscriber to the headend or any other central point (node) of a cable
49、 network 3.2 Symbols Symbols Terms Symbols Terms Optical receiver Spectrum analyser Test waveform generator Passive distribution network Variable signal generator Oscilloscope Variable attenuator Low pass filter High pass filter System Under Test Network Under Test Demodulator Modulator Amplifier with return path amplifier Bit Error Rate Detector O E A SUT/NU T G P(f) BER- 9 - EN 50083-10:2002 3.3 Abbreviations BER Bit Error Rate BW Bandwidth, equivalent noise bandwidth CATV Community Antenna Television CB Citizen Band CDMA
