SIST EN 50083-3:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 3. del: Aktivna širokopasovna oprema za koaksialna kabelska omrežjaKabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste -- Teil 3: Aktive Breitbandgeräte für koaxiale KabelnetzeRéseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs
-- Partie 3: Matériels actifs à large bande utilisés dans les réseaux de distribution coaxialeCable networks for television signals, sound signals and interactive services -- Part 3: Active wideband equipment for coaxial cable networks33.120.10Koaksialni kabli. ValovodiCoaxial cables. Waveguides33.060.40Kabelski razdelilni sistemiCabled distribution systemsICS:Ta slovenski standard je istoveten z:EN 50083-3:2002SIST EN 50083-3:2003en01-december-2003SIST EN 50083-3:2003SLOVENSKI
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SIST EN 50083-3:2003



EUROPEAN STANDARDEN 50083-3NORME EUROPÉENNEEUROPÄISCHE NORMApril 2002CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral 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 50083-3:2002 EICS 33.060.40Supersedes EN 50083-3:1998English versionCable networks for television signals,sound signals and interactive servicesPart 3: Active wideband equipment for coaxial cable networksRéseaux de distribution par câblespour signaux de télévision,signaux de radiodiffusion sonoreet services interactifsPartie 3: Matériels actifs à large bandeutilisés dans les réseaux de distributioncoaxialeKabelnetze für Fernsehsignale,Tonsignale und interaktive DiensteTeil 3: Aktive Breitbandgerätefür koaxiale KabelnetzeThis European Standard was approved by CENELEC on 2001-10-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified 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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.SIST EN 50083-3:2003



EN 50083-3: 2002- 2 -ForewordThis European Standard was prepared by CENELEC Technical Committee TC 209, "Cable networks fortelevision signals, sound signals and interactive services" on the basis of EN 50083-3:1998 and the firstamendment to EN 50083-3.The text of this first amendment was submitted to the Unique Acceptance Procedure and was approved byCENELEC on 2001-10-01 to be published as part of a second edition of EN 50083-3.The following dates were fixed:–latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement(dop)2002-10-01–latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2004-10-01Annexes designated "normative" are part of the body of the standard.Annexes designated "informative" are given for information only.In this standard, Annexes A, B, C and D are normative and Annexes E and F are informative.__________SIST EN 50083-3:2003



- 3 -EN 50083-3: 2002Content1Scope.51.1General.51.2Specific scope of this part 3.52Normative references.63Terms, definitions, symbols and abbreviations.73.1Terms and definitions.73.2Symbols.113.3Abbreviations.124Methods of measurement.134.1Linear distortion.134.2Non-linear distortion.144.3Automatic gain and slope control step response.244.4Noise figure.254.5Cross talk attenuation.264.6Signal level for digitally modulated signals.274.7Method of measurement for non-linearity of return path equipment carrying only digitalmodulated signals [Measurement of composite intermodulation noise ratio (CINR)].275Equipment requirements.295.1General requirements.295.2Safety.295.3Electromagnetic compatibility (EMC).295.4Frequency range.295.5Impedance and return loss.295.6Gain.295.7Flatness.305.8Test points.305.9Group delay.305.10Noise figure.305.11Non-linear distortion.305.12Automatic gain and slope control.315.13Hum modulation.315.14Power supply.325.15Environmental.325.16Marking.325.17Mean operating time between failure (MTBF).335.18Requirements for multiswitches.33AnnexesAnnex A (normative)
Test carriers, levels and intermodulation products.42Annex B (normative)
Checks on test equipment.44Annex C (normative)
Table C.1
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Frequency allocation plan.45Annex D (normative)
Special national conditions.46Annex E (informative)
Measurement errors which occur due to mismatched equipment.47Annex F (informative)
Examples of signals, methods of measurement and network design
for return paths.48TablesTable 1
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Return loss requirements for all equipment.34Table 2
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Correction factors where the modulation used is other than 100%.34Table 3
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Notch filter frequencies.35Table C.1
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Frequency allocation plan.45Table F.1
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Application of methods of measurement in EN 50083-3 for return path equipment.48Table F.2
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Application of methods of measurement in EN 50083-6 for return path equipment.49SIST EN 50083-3:2003



EN 50083-3: 2002- 4 -FiguresFigure 1
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Measurement of return loss.35Figure 2
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Maximum error a for measurement of return loss using V.S.W.R. bridge with directivity
D = 46 dB
and 26 dB test port return loss.35Figure 3
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Basic arrangement of test equipment for evaluation of the ratio of signal
to intermodulation product.36Figure 4
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Connection of test equipment for the measurement of non-linear distortion by composite beat.36Figure 5
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Connection of test equipment for the measurement
of composite crossmodulation.37Figure 6
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Carrier/hum ratio = 20lgdBAa.37Figure 7
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Test set-up for local-powered objects.38Figure 8
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Test set-up for remote-powered objects.38Figure 9
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Oscilloscope display.38Figure 10
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Measurement of AGC step response.39Figure 11
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Time constant Tc.39Figure 12
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Measurement of noise figure.39Figure 13
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Presentation of the result of CINR.40Figure 14
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Characteristic of the noise filter.40Figure 15
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Test setup for the non-linearity measurement.41Figure 16
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Measurement of cross talk attenuation for loop trough ports of multiswitches.41Figure A.1
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An example showing products formed when 2A
> B .42Figure A.2
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An example showing products formed when 2A
< B.42Figure A.3
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Products of the form A
B
C .43Figure E.1
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Error concerning return loss measurement.47Figure E.2
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Maximum ripple.47Figure F.1
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Spectrum of a QPSK-modulated signal.48Figure F.2a
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Loading with digital channels can be simulated with wideband noise.50Figure F.2b
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Non-linearity decreases the S/N at high levels.50Figure F.3
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Network used in the design example.50Figure F.4
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A test result measured from a real 20 dB return amplified.51Figure F.5
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The CINR curve of one amplifier is modified to represent the CINR of the whole
coaxial section of the network.52Figure F.6
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The CINR of an optical link as a function of OMI, example.53SIST EN 50083-3:2003



- 5 -EN 50083-3: 20021 Scope1.1 GeneralStandards of EN 50083 series deal with cable networks for television signals, sound signals andinteractive services including equipment, systems and installations for headend reception, processing and distribution of television and sound signals andtheir 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, MATV-networks and SMATV-networks, Individual receiving networks and all kinds of equipment, systems and installations installed in such networks, are within thisscope. The extent of this standardisation work is from the antennas, special signal source inputs to theheadend or other interface points 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 terminalsetc.) as well as of any coaxial and optical cables and accessories therefor is excluded.1.2 Specific scope of this part 3 This standard applies to all broadband amplifiers used in cable networks; covers the frequency range 5 MHz to 3000 MHz; applies to one-way and two-way equipment; lays down the basic methods of measurement of the operational characteristics of theactive equipment in order to assess the performance of this equipment; identifies the performance specifications that shall be published by the manufacturers; states the minimum performance requirements of certain parameters.Amplifiers are divided into the following two quality levels:Grade 1:Amplifiers typically intended to be cascaded.Grade 2:Amplifiers for use typically within an apartment block, or within a single residence, tofeed a few outlets.Practical experience has shown these types meet most of the technical requirements necessary forsupplying a minimum signal quality to the subscribers. This classification shall not be consideredas a requirement but as the information for users and manufacturers on the minimum qualitycriteria of the material required to install networks of different sizes. The system operator has toselect appropriate material to meet the minimum signal quality at the subscriber´s outlet, and tooptimise cost/performance, taking into account the size of the network and local circumstances.All requirements and published data are understood as guaranteed values within the specifiedfrequency range and in well matched conditions.SIST EN 50083-3:2003



EN 50083-3: 2002- 6 -2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revision ofany of these publications apply to this European Standard only when incorporated in it byamendment or revision. For undated references, the latest edition of the publication referred toapplies.EN 50083Cable networks for television signals, sound signals andinteractive servicesEN 50083-1+ A1+ A2199319971997Part 1:Safety requirementsEN 50083-22001Part 2:Electromagnetic compatibility for equipmentEN 50083-41998Part 4: Passive wideband equipment for coaxial cablenetworksEN 50083-52001Part 5:Headend equipmentEN 50083-61997Part 6: Optical equipmentEN 50083-102002System performance for return pathsEN 60068 /HD 323seriesEnvironmental testing/Basic environmental testingproceduresEN 60169-241993Radio frequency connectors – Part 24: Radio frequencycoaxial connectors with screw coupling, typically for usein 75 ohm cable distribution systems (Type F)(IEC 60169-24:1991)EN 60417seriesGraphical symbols for use on equipment(IEC 60417 series)EN 60529+ A119912000Degrees of protection provided by enclosures (IP Code)(IEC 60529:1989 + A1:1999)EN 61319-1+ A1119961999Interconnections of satellite receiving equipmentPart 1: Europe (IEC 61319-1:1995)EN 80416seriesBasic principles for graphical symbols for use onequipment (EIC 80416 series)HD 134.2.S21984Radio frequency connectors – Part 2: Coaxialunmatched connector (IEC 60169-2:1965 + A1:1982)ES 200 800V1.3.12001Digital Video Broadcasting (DVB); DVB interactionchannel for Cable TV distribution systems (CATV)ETS 300 1581992Satellite Earth Stations and Systems (SES) - TelevisionReceive Only (TVRO-FSS) Satellite Earth Stationsoperating in the 11/12 GHz FSS bandsETS 300 2491993Satellite Earth Stations and Systems (SES) - TelevisionReceive Only (TVRO) equipment used in theBroadcasting Satellite Service (BSS)SIST EN 50083-3:2003



- 7 -EN 50083-3: 20023 Terms, definitions, symbols and abbreviations3.1 Terms and definitionsFor the purpose of this standard, the following definitions apply.3.1.1 equalisera device designed to compensate over a certain frequency range for the amplitude/frequencydistortion or phase/frequency distortion introduced by feeders or equipmentNOTE
This device is for the compensation of linear distortions only.3.1.2 feedera transmission path forming part of a cable network. Such a path may consist of a metallic cable,optical fibre, waveguide or any combination of them. By extension, the term is also applied to pathscontaining one or more radio links3.1.3 decibel ratioten times the logarithm of the ratio of two quantities of power P1 and P2, i.e.10lgPP12(dB)3.1.4 standard reference power and voltageIn cable networks the standard reference power, P0, is 1/75 pWNOTE
This is the power dissipated in a 75 ohm resistor with a voltage drop of 1VRMS across it.The standard reference voltage, U0, is 1V3.1.5 levelthe level of any power P1 is the decibel ratio of that power to the standard reference power P0, i.e.01PPlg10the level of any voltage U1 is the decibel ratio of that voltage to the standard reference voltage U0,i.e.01UUlg20This may be expressed in decibel (relative to 1V in 75 ohm) or more simply in dB (V) if there isno risk of ambiguity.3.1.6 attenuationratio of the input power to the output power of an equipment or system, usually expressed indecibel3.1.7 gaindecibel ratio of the output power to the input powerSIST EN 50083-3:2003



EN 50083-3: 2002- 8 -3.1.8 amplitude frequency responsegain or loss of an equipment or system plotted against frequency3.1.9 slopedifference in gain or attenuation at two specified frequencies between any two points in anequipment or system3.1.10 crossmodulationundesired modulation of the carrier of a desired signal by the modulation of another signal as aresult of equipment or system non-linearities3.1.11 carrier to noise ratiodifference in decibel between the vision or sound carrier level at a given point in an equipment orsystem and the noise level at that point (measured within a bandwidth appropriate to the televisionor radio system in use)3.1.12 noise factor/noise figurenoise factor/noise figure are used as figures of merit describing the internally generated noise of anactive deviceThe noise factor (F) is the ratio of the carrier to noise ratio at the input, to the carrier to noise ratioat the output of an active device, assuming the incoming carrier is noise free.2211//NCNCFwhereC1=signal power at the inputC2=singal power at the outputN1=noise power at the input (ideal thermal noise)N2=noise power at the outputIn other words, the noise factor is the ratio of noise power at the output of an active device to thenoise power at the same point if the device had been ideal and added no noise.idealactualNNF22The noise factor is dimensionless and is often expressed as noise figure (NF) in dBNF
=10 lg F (dB)SIST EN 50083-3:2003



- 9 -EN 50083-3: 20023.1.13 ideal thermal noisenoise generated in a resistive component due to the thermal agitation of electronsThe thermal power generated is given by:P=4 x B x k x TwhereP=noise power in wattsB=bandwidth in hertzk=Boltzmann's constant=1,38 x 10-23 J/KT=absolute temperature in kelvinsIt follows that:UR2=4 x B x k x Tand U=4xRxBxkxTwhere:U = noise voltageR = resistance in ohmsIn practice it is normal for the source to be terminated with a load equal to the internal resistancevalue, the noise at the input is then U/2.3.1.14 chrominance / luminance delay inequalitydelay inequality in nanoseconds, between the luminance and chrominance (4,43 MHz) within asingle PAL/SECAM television channel. The worst case channels shall be identified by frequency.3.1.15 well-matchedmatching condition when the return loss of the equipment complies with the requirements ofTable 1.NOTE
Through mismatching of measurement instruments and the measurement object measurement errors arepossible. Comments to the estimation of such errors are given in Annex E.3.1.16 multiswitchequipment used in distribution systems for signals that are received from satellites and convertedto a suitable IF. The IF signals that are received from different polarisations, frequency bands andorbital positions are input signals to the multiswitch. Subscriber feeders are connected tomultiswitch output ports. Each output port is switched to one of the input ports, depending oncontrol signals that are transmitted from the subscriber equipment to the multiswitch. Beside asplitter for each input port and a switch for each output port a multiswitch can contain amplifiers tocompensate for distribution or cable losses.3.1.17 multiswitch loop through portone or more ports to loop through the input signals through a multiswitch. This enables largernetworks with multiple multiswitches, each one installed close to a group of subscribers. Themultiswitches are connected in a loop through manner. The IF signals that are received by anoutdoor unit from different polarisations, frequency bands and orbital positions are input signals toa first multiswitch. Cables connect the loop through ports of this multiswitch to the input ports of asecond multiswitch and so on.SIST EN 50083-3:2003



EN 50083-3: 2002- 10 -3.1.18 multiswitch port for terrestrial signalsA network can be used to distribute terrestrial signals in addition to the signals received fromsatellites. The terrestrial antennas are connected to an optional terrestrial input port of amultiswitch. On each output port the terrestrial signals are available in addition to the satellite IFsignals. Since the usual frequency ranges for terrestrial signals and satellite IF signals do notoverlap, both can be carried on the same cable.For large networks with loop through connected multiswitches, two possibilities exist to carry theterrestrial signals from one multiswitch to another multiswitch:a) To use a specialised cable for the terrestrial signal, in addition with the cables used for thesatellite IF signals and then, on each output port the terrestrial signal is combined with the selectedsatellite IF signal.b) To combine the terrestrial signal with each satellite IF signal before the first multiswitch inorder to minimise the number of cables between multiswitches.NOTE
The signal coming from an outdoor unit for satellite reception may contain unwanted signal-components withfrequencies below the foreseen satellite IF frequency range. These signal-components overlap with the frequency rangeof terrestrial signals. For example, an outdoor unit that converts the frequency band 11,7 to 12,75 GHz to the satellite IFfrequency range may convert signals in the 10,7 to 11,7 GHz band to frequencies below the satellite IF frequency range.These frequencies have to be filtered out sufficiently to avoid interference with terrestrial signals on the same cable.3.1.19 cross talk attenuationunwanted signals beside the wanted signal on a lead caused by electromagnetic coupling betweenleads. Cross talk attenuation is the ratio of the wanted signal power to the unwanted signal power,while equal signal powers are applied to the leads. Cross talk attenuation is usually expressed indecibel.3.1.20 composite intermodulation noise (CIN)sum of noise and intermodulation products from digital modulated signals3.1.21 composite intermodulation noise ratio (CINR)ratio of the signal level and the CIN level.SIST EN 50083-3:2003



- 11 -EN 50083-3: 20023.2 SymbolsSymbolsTermsSymbolsTermsAamperemeterVvoltmeterWpower meteroscilloscopeGsignal generatorGvariable signal generatorGkTnoise generatorlow pass filterhigh pass filterbandpass filterstop band filterDUTdevice under TestAx dBattenuatorAvariable attenuatorcombinertap-off-boxdouble tap-off-boxOEoptical receiveramplifier with return pathamplifierspectrum analyserdetector with LF-amplifieradjustable AC voltage sourcegroundcapacitorRF chokevariable resistorSIST EN 50083-3:2003



EN 50083-3: 2002- 12 -3.3 AbbreviationsACalternating currentAFaudio frequencyAGCautomatic gain controlAMamplitude modulationCATVcommunity antenna television (system)CINComposite intermodulation noiseCINRComposite intermodulation noise ratioCSOcomposite second orderCTBcomposite tripple beatCWcontinous waveDUTdevice under testEMCelectromagnetic compatibilityHPhigh passIFintermediate frequencyIPinternational protectionLFlow frequencyLPlow passMATVmaster antenna television (system)MTBFmeantime between failureOMIOptimum Modulation IndexPALphase alternating lineRFradio frequencyRMSroot mean squareRSrotary switchSECAMséquenciel couleur a mémoireSGsignal generatorSMATVsatellite master antenna television (system)TVtelevisionVSWRvoltage standing wave ratioXMODcross modulationNOTE
Only the abbreviations used in the English version of this part of EN 50083 are mentioned in this subclause. TheGerman and the French versions of this part may use other abbreviations. Refer to 3.3 of each language version fordetails.SIST EN 50083-3:2003



- 13 -EN 50083-3: 20024 Methods of measurementThis clause defines basic methods of measurement. Any equivalent method that ensures the sameaccuracy may be used for assessing performance.Unless stated otherwise, all measurements shall be carried out with 0 dB plug-in attenuators andequalisers. The position of variable controls used during the measurements shall be published.The test set-up shall be well matched over the specified frequency band.For measurements on multiswitches it is necessary that control signals be fed to the output portsthat are involved in the measurement. Therefore, a bias-tee has to be connected between themultiswitch output port and the measurement set. The DC port of the bias-tee is connected to astandard receiver that generates the required control signals. Care has to be taken that theinfluence of the bias-tee on the measurement result is insignificant. This can be achieved byincluding it into the calibration or using a network analyser with a built in bias-tee.4.1 Linear distortion4.1.1 Return lossThe method described is applicable to the measurement of the return loss of equipment operatingin the frequency range 5 MHz to 3 000 MHz.All input and output ports of the unit shall meet the specification under all conditions of automaticand manual gain controls and with any combination of plug-in equalisers and attenuators fitted.4.1.1.1 Equipment requireda)A signal generator or sweep generator, adjustable over the frequency range of the equipmentto be tested;Care must be taken to ensure that the signal generator or sweep generator output does nothave a high harmonic content as this can cause serious inaccuracy.b)A voltage standing wave ratio bridge with built-in or separate RF detector;The accuracy of measurement is dependent on the quality of the bridge; in particular
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