SIST EN 300 449 V1.2.1:2004

Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation

Specification of the public network side of the interface and the performance of the leased line service, including test procedures for compliance. Revision of ETS 300 449 to improve the safety related text following a liaison received from TC Safety.

Dostop in terminali (AT) - Analogni 2-žični zakupljeni vodi z govorno pasovno širino in posebno kakovostjo (A2S) - Priključitvene značilnosti in omrežni vmesnik

General Information

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2004
• Due Date: 01-Oct-2004
• Completion Date: 01-Oct-2004
• Mandate: T-147-2
• Ref Project: ETSI EN 300 449 V1.2.1 (2001-07) - Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 449 Version 1.2.1SIST EN 300 449 V1.2.1:2004en01-oktober-2004SIST EN 300 449 V1.2.1:2004SLOVENSKI
STANDARD



SIST EN 300 449 V1.2.1:2004



ETSIEN300449V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Specialqualityvoicebandwidth2-wireanalogueleasedline(A2S);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)2ReferenceREN/AT-010002KeywordsONP,leasedlineETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitions,symbolsandabbreviations.73.1Definitions.73.2Symbolsandabbreviations.74Requirements.84.1Connectioncharacteristics.84.1.1Tabulationofconnectioncharacteristics.84.1.2Overallloss.94.1.3Loss/frequencydistortion.94.1.4Transmissionsignals.104.1.4.1Maximummeaninputpower.104.1.4.2Maximuminstantaneouspower.104.1.4.3Maximumpowerina10Hzbandwidth.104.1.4.4Maximuminputpoweroutsidethevoiceband.104.1.5Transmissiondelay.104.1.6Groupdelaydistortion.114.1.7Variationofoveralllosswithtime.124.1.7.1Amplitudehits.124.1.7.2Othervariations.124.1.8Randomcircuitnoise.124.1.9Impulsivenoise.134.1.10Phasejitter.134.1.11Distortion.134.1.11.1Quantizingdistortion.134.1.11.2Totaldistortion.134.1.12Singletoneinterference.134.1.13Frequencyerror.144.1.14Harmonicdistortion.144.1.15Echoandstability.144.1.15.1Echo.144.1.15.1.1Echocontroldevices.144.1.15.1.2Talkerecho.144.1.15.1.3Listenerecho.144.1.15.2Stability.144.2Interfacepresentation.144.2.1Connectorspecification.154.2.2Hardwiredpresentation.154.2.3Returnloss.154.2.4Powerfeeding.164.3Safety.164.4Overvoltage.164.5ElectroMagneticCompatibility(EMC).164.6Availability.16AnnexA(normative):Testmethods.17A.1General.17A.1.1Equipmentconnection.17A.1.2Referenceimpedance.17A.1.3Non-reactivelinetermination.18SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)4A.1.4Measurementfrequency.18A.2Testmethods.18A.2.1Overallloss.18A.2.2Loss/frequencydistortionandmaximummeaninputpower.19A.2.3Maximuminstantaneouspower.19A.2.4Groupdelaydistortion.20A.2.5Amplitudehits.20A.2.6Randomcircuitnoise.21A.2.7Impulsivenoise.21A.2.8Phasejitter.22A.2.9Totaldistortion.22A.2.10Singletoneinterference.23A.2.11Frequencyerror.23A.2.12Harmonicdistortion.24A.2.13Stability.24A.2.14Returnloss.25A.2.15Powerfeeding.26AnnexB(informative):Weightedreturnlossmeasurements.27B.1Introduction.27B.2Weightingfunction.27B.2.1Calculation(trapezoidalrule).27B.2.2Calculation(tabulateddata).28AnnexC(informative):Overalllossandquantizingdistortion.29C.1Introduction.29C.2Overallloss.30C.3Quantizingdistortion.31AnnexD(informative):Availability.32D.1General.32D.1.1Unavailability.32D.1.2Availability.32D.2Definitionofunavailabilityperiods.32D.3Availabilityfigures.34AnnexE(informative):Bibliography.35History.36SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeAccessandTerminals(AT).ThepresentdocumentresultedfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforsupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Thereisanotherstandarddirectlyrelatedtothepresentdocument:-EN300450:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)(seeannexE)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlineswithinandbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexE),laterreplacedby98/13/EC(seeannexE),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationM.1020(seeannexE)wasusedasthebasisfortheconnectioncharacteristics.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfacepresentationofspecialquality,voicebandwidth,2-wire,analogueleasedlines,providedaspartoftheminimumsetundertheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)(seeannexE).AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocumentalthoughinpracticetheoverallperformancemaybeconsiderablybetter.Theleasedlineprovidesaccesstothevoicebandwidth(300Hzto3400Hz)withnorestrictionsontheuseofthefrequencies.Therequirementsofthepresentdocumenthavebeenchosenprimarilyforthetransmissionofdatabetweenterminalequipmentswithoutequalizersalthoughthereisnorestrictionontheuseoftheleasedlineforothertypesoftraffic.Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thetestsspecifiedinthepresentdocumentcannotbecarriedout,norcanperformancebemonitoredbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryinguser'straffic.Thusthetestsaredesignedforbringingintoandreturningintoservicealthoughthereisnoobligationtoperformthesetestseachtimetheleasedlineisbroughtintoorreturnedintoservice.Thepresentdocumentcoversthephysical,mechanicalandelectricalcharacteristicsofthenetworkinterfaceandspecifiestheconformancetestsfortheconnectioncharacteristicsandnetworkinterface.Someofthetestsdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationO.71(1988):"Impulsivenoisemeasuringequipmentfortelephone-typecircuits".[2]ITU-TRecommendationO.81(1988):"Group-delaymeasuringequipmentfortelephone-typecircuits".[3]ITU-TRecommendationO.91(1988):"Phasejittermeasuringequipmentfortelephone-typecircuits".[4]ITU-TRecommendationO.95(1988):"Phaseandamplitudehitcountersfortelephone-typecircuits".[5]ITU-TRecommendationO.132(1988):"Quantizingdistortionmeasuringequipmentusingasinusoidaltestsignal".SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)7[6]ISO/IEC8877(1992):"Informationtechnology.Telecommunicationsandinformationexchangebetweensystems.InterfaceconnectorandcontactassignmentsforISDNBasicAccessInterfacelocatedatreferencepointsSandT".[7]ITU-TRecommendationO.41(1994):"Psophometerforuseontelephone-typecircuits".[8]ETSIEN300450:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);Terminalequipmentinterface".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:groupdelay:measureofthepropagationtimethroughtheleasedline.Foragivenfrequencyitisequaltothefirstderivativeofthephaseshiftthroughtheleasedline,measuredinradians,withrespecttotheangularfrequencymeasuredinradianspersecondgroupdelaydistortion:differencebetweengroupdelayatagivenfrequencyandminimumgroupdelay,inthefrequencybandofinterestleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkreferenceimpedanceZR:compleximpedancemadeupofaresistanceof270Ωinserieswithaparallelcombinationof750Ωand150nF.SeealsoclauseA.1.2terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationnetwork;i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationnetwork,inordertosend,process,orreceiveinformation.voicebandwidth:bandoffrequenciesovertherange300Hzto3400Hz3.2SymbolsandabbreviationsForthepurposesofthepresentdocument,thefollowingsymbolsandabbreviationsapply:aReturnlossindBaf()ReturnlossatfrequencyfindBawWeightedreturnlossindBAf()ReturnlossatfrequencyfexpressedasaratioA2SSpecialqualityvoicebandwidth2-wireanalogueleasedlineADPCMAdaptiveDifferentialPulseCodedModulationEMCElectroMagneticCompatibilityffrequencyNTPNetworkTerminationPointONPOpenNetworkProvisionSIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)8qduquantizingdistortionunitrmsrootmeansquareZRReferenceimpedance4Requirements4.1ConnectioncharacteristicsThespecialqualityvoicebandwidth2-wireanalogueleasedlineisabidirectionalline,configuredpoint-to-point,nominallycoveringthevoicebandwidth.Theconnectionis,ingeneral,symmetrical,i.e.eachdirectionoftransmissionhasthesamenominalcharacteristics,althoughtheactualvaluesareindependent.4.1.1TabulationofconnectioncharacteristicsTheparametersdefiningthecharacteristicsoftheconnectionaregivenintable1.Thesecharacteristicsdefinetheserviceoffered.Table1:NetworkperformancecharacteristicsDescriptionNatureReferenceclauseOverallloss0≤overallloss≤17dB4.1.2Loss/frequencydistortiontable2,figure14.1.3Transmissionsignals-maximummeaninputpower-maximuminstantaneouspower-maximumpowerina10Hzbandwidth-maximuminputpoweroutsidevoiceband-9dBm+4dBmnorequirementnorequirement4.1.44.1.4.14.1.4.24.1.4.34.1.4.4Transmissiondelay-terrestrial(fordistanceGinkilometres)-viasatellite<(15+0,01G)ms<350ms4.1.5Groupdelaydistortiontable3,figure34.1.6Variationofoveralllosswithtime-amplitudehits-othervariations≤10ina15minuteperiod±4dBofthatat1020Hz4.1.74.1.7.14.1.7.2Randomcircuitnoise<-41dBm0p(seenote)4.1.8Impulsivenoise≤18peaks≥-21dBm0ina15minuteperiod(seenote)4.1.9Phasejitter≤10°peaktopeak4.1.10Totaldistortion-quantizingdistortion-totaldistortion≤3qdu;noADPCM>28dBsignaltodistortionratio4.1.114.1.11.14.1.11.2Singletoneinterference≤-44dBm0(seenote)4.1.12Frequencyerror≤±5Hz4.1.13Harmonicdistortion≥25dBbelowfundamental4.1.14Echoandstability-Echocontroldevices-Talkerecho-Listenerecho-Stabilitynoechocontrol>10dB>20dB0to4kHz4.1.154.1.15.1.14.1.15.1.24.1.15.1.34.1.15.2NOTE:Wheretheoutputrelativelevelisnotdefined,analternativevalueisspecifiedinthereferenceclause.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)94.1.2OveralllossRequirement:Theoverallloss,includinglongtermvariations,presentedtoasignalfrequencyof1020Hzsentatapowerlevelof-9dBmineachdirectionoftransmissionwiththelineterminatedin600Ωateachendshallbeintherange:0≤overallloss≤17dBNOTE:Theoveralllossineachdirectioncanbedifferent.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3Loss/frequencydistortionRequirement:Theoveralllossrelativetothatdefinedinclause4.1.2abovefortheconnection,presentedtoasignalsentatapowerlevelof-9dBmwiththelineterminatedin600Ωateachendshallliebetweenthelimitsgivenintable2andfigure1.Below300Hzandabove3600Hztherelativelossshallnotbelessthan-2dBand0dBrespectively,butisotherwiseunspecified.Table2:Limitsforlossofthecircuitrelativetothatat1020HzUpperlimitLowerlimitPoint(seefigure1)FrequencyHzRelativelossdBPoint(seefigure1)FrequencyHzRelativelossdBA3006G500-2B5006H500-1C5003I2800-1D28003J2800-2E28006K3600-2F30006L36000300500FrequencyHz0-1-236RelativelossdB2800360030001020ABCDEFGHIJKLFigure1:Limitsforlossofthecircuitrelativetothatat1020HzTest:ThetestshallbeconductedaccordingtoclauseA.2.2.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)104.1.4Transmissionsignals4.1.4.1MaximummeaninputpowerRequirement:Theleasedlineshallbecapableofcarryinganysignalpresentedattheinputataoneminutemeanpowerlevelof-9dBmwithinavoicebandwidthof300Hzto3400Hzwiththelineterminatedin600Ωateachend.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.4.2MaximuminstantaneouspowerRequirement:Theleasedlineshallbecapableofcarryingasignalattheinputhavingamaximumvalueequaltoaninstantaneouspowerwhichis13dBabovethemeanvalueof-9dBm(i.e.+4dBm).NOTE:ThisvalueisbaseduponaprovisionalITU-Tvalue.SeeITU-TRecommendationV.2(seeannexE).Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.4.3Maximumpowerina10HzbandwidthThereisnorequirementformaximumpowerina10Hzbandwidth.NOTE:However,thereisacorrespondingrequirementontheterminalequipmentspecifiedinEN300450[8].4.1.4.4MaximuminputpoweroutsidethevoicebandNOTE:Theleasedlineinterfaceisnotsuitableforthehandlingofsignalsbelow300Hzandabove3400Hz.Outofbandsignalsfromtheterminalequipmentarelimitedtoavoidtroubleinthenetwork(seeterminalequipmentinterfacerequirementinEN300450[8]).4.1.5TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolvedtheonewayend-to-enddelayshallbelessthan(15+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure2;orb)forconnectionswheresatellitetransmissionisinvolvedtheonewayend-to-enddelayshallbelessthan350ms.NOTE:Requirementsa)andb)arebasedonclausesA.2andA.3ofITU-TRecommendationG.114(seeannexE)withsuitableadjustmenttorequirementa)toallowforthepossibleuseofloadedcable.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)11Delay(ms)Geographicaldistance(km)100090003000600010015Figure2:UpperlimitofdelayTest:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.6GroupdelaydistortionRequirement:Theconnectionshallconformtothelimitsforgroupdelaydistortiongivenintable3andfigure3inwhichthelimitingvaluesoverthefrequencybandareexpressedasvaluesrelativetotheminimummeasuredgroupdelayinthe500Hzto2800Hzfrequencyband.NOTE:Figure3isbasedonfigure2ofITU-TRecommendationM.1020(seeannexE).Table3:Limitsforgroupdelayrelativetotheminimummeasuredgroupdelayinthe500Hzto2800HzbandUpperlimitPoint(seefigure3)FrequencyHzGroupdelaydistortionmsA5003,0B6003,0C6001,5D10001,5E10000,5F26000,5G26003,0H28003,0SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)12300500FrequencyHz2800260001234Groupdelaydistortionms56001000ABCDEFGHFigure3:Limitsforgroupdelayrelativetotheminimummeasuredgroupdelayinthe500Hzto2800HzbandTest:ThetestshallbeconductedaccordingtoclauseA.2.4.4.1.7Variationofoveralllosswithtime4.1.7.1AmplitudehitsRequirement:WhenmeasurementsaremadeusinganinstrumentcomplyingwithITU-TRecommendationO.95[4]withthesendlevelsetat-9dBmatafrequencyof1020Hz,thenumberofamplitudehitsgreaterthan±2dBshallnotexceed10inany15minutemeasuringperiod.NOTE:Phaseoramplitudehitsaredefinedassuddenpositiveornegativechangesinphaseoramplitudeofanobservedtestsignalwhichexceedaspecifiedthresholdandpersistforaperiodoftimegreaterthanaspecifiedduration.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.1.7.2OthervariationsRequirement:Foraparticularimplementationvariationswithtimeoftheoveralllossat1020Hz(includingdailyandseasonalvariationsbutexcludingamplitudehits)shallnotexceed±4dBvariationfromthevalueestablishedbythetestforoverallloss,seeclause4.1.2.Anysuchvariationshallnotresultinanoveralllossgreaterthanthemaximumspecifiedinclause4.1.2.Test:Thereisnotestforthisbuttherecordoftheresultsofsuccessivetestsofoveralllossmaybeusedtocheckcompliance.ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.8RandomcircuitnoiseRequirement:Thelevelofthepsophometricnoisepowerattheoutputoftheleasedlineshallbelessthan-41dBm0p.Inorderthatthisparametercanbetested,theleasedlineprovidershoulddeclaretheplannedvalueoftheoutputrelativeleveloftheleasedline.SIST EN 300 449 V1.2.1:2004



ETSIETSIEN300449V1.2.1(2001-07)13Wheretheoutputrelativeleveleitherisnot,orcannotbe,declaredbytheleasedlineprovider,thepsophometricallyweightedrandomcircuitnoiselevelshallbe28dBbelowareceivedtestsignalwhichissentatalevelof-9dBmatafrequencyof1020Hzintothefarendoftheleasedline.Test:ThetestshallbeconductedaccordingtoclauseA.2.6.4.1.9ImpulsivenoiseRequirement:Withaninputsignallevelof-9dBmappliedatafrequencyof1020Hztotheinputoftheleasedline,theresha
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