SIST EN 300 448 V1.2.1:2004

Access and Terminals (AT); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); 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 300 448 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 navadno kakovostjo (A2O) - 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 300 448 V1.2.1 (2001-07) - Access and Terminals (AT); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); 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); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 448 Version 1.2.1SIST EN 300 448 V1.2.1:2004en01-oktober-2004SIST EN 300 448 V1.2.1:2004SLOVENSKI
STANDARD



SIST EN 300 448 V1.2.1:2004



ETSIEN300448V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Ordinaryqualityvoicebandwidth2-wireanalogueleasedline(A2O);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)2ReferenceREN/AT-010001KeywordsONP,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 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitions,symbolsandabbreviations.73.1Definitions.73.2Symbolsandabbreviations.74Requirements.84.1Connectioncharacteristics.84.1.1Tabulationofconnectioncharacteristics.84.1.2Overallloss.84.1.3Loss/frequencydistortion.94.1.4Transmissionsignals.94.1.4.1Maximummeaninputpower.94.1.4.2Maximuminstantaneouspower.104.1.4.3Maximumpowerina10Hzbandwidth.104.1.4.4Maximuminputpoweroutsidethevoiceband.104.1.5Transmissiondelay.104.1.6Groupdelaydistortion.114.1.7Variationofoveralllosswithtime.114.1.7.1Amplitudehits.114.1.7.2Othervariations.114.1.8Randomcircuitnoise.114.1.9Impulsivenoise.114.1.10Phasejitter.114.1.11Distortion.114.1.11.1Quantizingdistortion.114.1.11.2Totaldistortion.124.1.12Singletoneinterference.124.1.13Frequencyerror.124.1.14Harmonicdistortion.124.1.15Echoandstability.124.1.15.1Echo.124.1.15.1.1Echocontroldevices.124.1.15.1.2Talkerecho.124.1.15.1.3Listenerecho.124.1.15.2Stability.124.2Interfacepresentation.134.2.1Connectorspecification.134.2.2Hardwiredpresentation.134.2.3Returnloss.134.2.4Powerfeeding.144.3Safety.144.4Overvoltage.144.5ElectroMagneticCompatibility(EMC).144.6Availability.14AnnexA(normative):Testmethods.15A.1General.15A.1.1Equipmentconnection.15A.1.2Referenceimpedance.15A.1.3Non-reactivelinetermination.16SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)4A.1.4Measurementfrequency.16A.2Testmethods.16A.2.1Overallloss.16A.2.2Loss/frequencydistortionandmaximummeaninputpower.17A.2.3Maximuminstantaneouspower.17A.2.4Randomcircuitnoise.18A.2.5Stability.18A.2.6Returnloss.19A.2.7Powerfeeding.20AnnexB(informative):Weightedreturnlossmeasurements.21B.1Introduction.21B.2Weightingfunction.21B.2.1Calculation(trapezoidalrule).21B.2.2Calculation(tabulateddata).22AnnexC(informative):Overalllossandquantizingdistortion.23C.1Introduction.23C.2Overallloss.24C.3Quantizingdistortion.25AnnexD(informative):Availability.26D.1General.26D.1.1Unavailability.26D.1.2Availability.26D.2Definitionofunavailabilityperiods.26D.3Availabilityfigures.28AnnexE(informative):Bibliography.29History.30SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(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,theleasedlinesprovidedoverpublictelecommunicationnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlineswithinandbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexE),laterreplacedby98/13/EC(seeannexE),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationM.1040(seeannexE)wasusedasthebasisfortheconnectioncharacteristics.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfacepresentationofordinaryquality,voicebandwidth,2-wire,analogueleasedlines,providedaspartoftheminimumsetundertheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)(seeannexE).AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocumentalthoughinpracticetheoverallperformancemaybeconsiderablybetter.Theleasedlineprovidesaccesstothevoicebandwidth(300Hzto3400Hz)withnorestrictionsontheuseofthefrequencies.Therequirementsofthepresentdocumenthavebeenchosenprimarilyforthetransmissionoftelephonyalthoughthereisnorestrictionontheuseoftheleasedlineforothertypesoftraffic.Thepresentdocumentisapplicableforleasedlines,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]ISO/IEC8877(1992):"Informationtechnology.Telecommunicationsandinformationexchangebetweensystems.InterfaceconnectorandcontactassignmentsforISDNBasicAccessInterfacelocatedatreferencepointsSandT".[2]ITU-TRecommendationO.41(1994):"Psophometerforuseontelephone-typecircuits".[3]ETSIEN300450:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);Terminalequipmentinterface".SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)73Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:groupdelay:measureofthepropagationtimethroughtheleasedline.Foragivenfrequencyitisequaltothefirstderivativeofthephaseshiftthroughtheleasedline,measuredinradians,withrespecttotheangularfrequencymeasuredinradianspersecondgroupdelaydistortion:differencebetweengroupdelayatagivenfrequencyandminimumgroupdelay,inthefrequencybandofinterestleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkreferenceimpedanceZR:compleximpedancemadeupofaresistanceof270Ωinserieswithaparallelcombinationof750Ωand150nF.SeealsoclauseA.1.2terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationnetwork;i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationnetwork,inordertosend,process,orreceiveinformation.voicebandwidth:bandoffrequenciesovertherange300Hzto3400Hz3.2SymbolsandabbreviationsForthepurposesofthepresentdocument,thefollowingsymbolsandabbreviationsapply:aReturnlossindB)(faReturnlossatfrequencyfindBwaWeightedreturnlossindB)(fAReturnlossatfrequencyfexpressedasaratioA2OOrdinaryqualityvoicebandwidth2-wireanalogueleasedlineADPCMAdaptiveDifferentialPulseCodedModulationEMCElectroMagneticCompatibilityffrequencyFDMFrequencyDivisionMultiplexingNTPNetworkTerminationPointONPOpenNetworkProvisionqduquantizingdistortionunitTDMTimeDivisionMultiplexingZRReferenceimpedanceSIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)84Requirements4.1ConnectioncharacteristicsTheordinaryqualityvoicebandwidth2-wireanalogueleasedlineisabi-directionalline,configuredpoint-to-point,nominallycoveringthevoicebandwidth.Theconnectionis,ingeneral,symmetrical,i.e.eachdirectionoftransmissionhasthesamenominalcharacteristics,althoughtheactualvaluesareindependent.4.1.1TabulationofconnectioncharacteristicsTheparametersdefiningthecharacteristicsoftheconnectionaregivenintable1.Thesecharacteristicsdefinetheserviceoffered.Table1:NetworkperformancecharacteristicsDescriptionNatureReferenceclauseOverallloss0≤overallloss≤25dB4.1.2Loss/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<350ms4.1.5Groupdelaydistortionnorequirement4.1.6Variationofoveralllosswithtime-amplitudehits-othervariationsnorequirement±4dBofthatat1020Hz4.1.74.1.7.14.1.7.2Randomcircuitnoise<-41dBm0p(seenote)4.1.8Impulsivenoisenorequirement4.1.9Phasejitternorequirement4.1.10Totaldistortion-quantizingdistortion-totaldistortion≤7,5qdu;≤1ADPCMsystemnorequirement4.1.114.1.11.14.1.11.2Singletoneinterferencenorequirement4.1.12Frequencyerrornorequirement4.1.13Harmonicdistortionnorequirement4.1.14Echoandstability-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.4.1.2OveralllossRequirement:Theoverallloss,includinglongtermvariations,presentedtoasignalfrequencyof1020Hzsentatapowerlevelof-9dBmineachdirectionoftransmissionwiththelineterminatedin600Ωateachendshallbeintherange:0≤overallloss≤25dB.NOTE:Theoveralllossineachdirectioncanbedifferent.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)94.1.3Loss/frequencydistortionRequirement:Theoveralllossrelativetothatdefinedinclause4.1.2abovefortheconnection,presentedtoasignalsentatapowerlevelof-9dBmwiththelineterminatedin600Ωateachendshallliebetweenthelimitsgivenintable2andfigure1.Below400Hzandabove3600Hztherelativelossshallnotbelessthan-4dBand0dBrespectively,butisotherwiseunspecified.Table2:Limitsforlossofthecircuitrelativetothatat1020HzUpperlimitLowerlimitPoint(seefigure1)FrequencyHzRelativelossdBPoint(seefigure1)FrequencyHzRelativelossdBA4009E400-4B20009F400-3C200016G3600-3D280016H360003002000FrequencyHz40036000916-32800ABCDGHRelativelossdB1020-4EFFigure1:Limitsforlossofthecircuitrelativetothatat1020HzTest:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.4Transmissionsignals4.1.4.1MaximummeaninputpowerRequirement:Theleasedlineshallbecapableofcarryinganysignalpresentedattheinputataoneminutemeanpowerlevelof-9dBmwithinavoicebandwidthof300Hzto3400Hzwiththelineterminatedin600Ωateachend.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)104.1.4.2MaximuminstantaneouspowerRequirement:Theleasedlineshallbecapableofcarryingasignalattheinputhavingamaximumvalueequaltoaninstantaneouspowerwhichis13dBabovethemeanvalueof-9dBm(i.e.+4dBm).NOTE:ThisvalueisbaseduponaprovisionalITU-Tvalue.SeeITU-TRecommendationV.2(seeannexE).Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.4.3Maximumpowerina10HzbandwidthThereisnorequirementformaximumpowerina10Hzbandwidth.NOTE:However,thereisacorrespondingrequirementontheterminalequipmentspecifiedinEN300450[3].4.1.4.4MaximuminputpoweroutsidethevoicebandNOTE:Theleasedlineinterfaceisnotsuitableforthehandlingofsignalsbelow300Hzandabove3400Hz.Outofbandsignalsfromtheterminalequipmentarelimitedtoavoidtroubleinthenetwork(seeterminalequipmentinterfacerequirementinEN300450[3]).4.1.5TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolvedtheonewayend-to-enddelayshallbelessthan(15+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure2;orb)forconnectionswheresatellitetransmissionisinvolvedtheonewayend-to-enddelayshallbelessthan350ms.NOTE:Requirementsa)andb)arebasedonclauses2.2and2.3ofITU-TRecommendationG.114(seeannexE),withsuitableadjustmenttorequirementa)toallowforthepossibleuseofloadedcable.Delay(ms)Geographicaldistance(km)100090003000600010015Figure2:UpperlimitofdelayTest:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)114.1.6GroupdelaydistortionThereisnorequirementforgroupdelaydistortion.NOTE:Groupdelaydistortionisnotconsideredtobeimportantforvoicecommunication.Terminalequipmentforotherpurposeswhichwishestomakeuseofleasedlinesconformingtothepresentdocumentwillneedtocompensateforpossibleshortcomingsduetogroupdelaydistortion.4.1.7Variationofoveralllosswithtime4.1.7.1AmplitudehitsThereisnorequirementforamplitudehits.NOTE:Phaseoramplitudehitsaredefinedassuddenpositiveornegativechangesinphaseoramplitudeofanobservedtestsignalwhichexceedaspecifiedthresholdandpersistforaperiodoftimegreaterthanaspecifiedduration.4.1.7.2OthervariationsRequirement:Foraparticularimplementation,variationswithtimeoftheoveralllossat1020Hz(includingdailyandseasonalvariationsbutexcludingamplitudehits)shallnotexceed±4dBvariationfromthevalueestablishedbythetestforoverallloss,seeclause4.1.2.Anysuchvariationshallnotresultinanoveralllossgreaterthanthemaximumspecifiedinclause4.1.2.Test:thereisnotestforthisbuttherecordoftheresultsofsuccessivetestsofoveralllossmaybeusedtocheckcompliance.ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.8RandomcircuitnoiseRequirement:Thelevelofthepsophometricnoisepowerattheoutputoftheleasedlineshallbelessthan-41dBm0p.Inorderthatthisparametercanbetested,theleasedlineprovidershoulddeclaretheplannedvalueoftheoutputrelativeleveloftheleasedline.Wheretheoutputrelativeleveleitherisnot,orcannotbe,declaredbytheleasedlineprovider,thepsophometricallyweightedrandomcircuitnoiselevelshallbe28dBbelowareceivedtestsignalwhichissentatalevelof-9dBmatafrequencyof1020Hzintothefarendoftheleasedline.Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.1.9ImpulsivenoiseThereisnorequirementforimpulsivenoise.4.1.10PhasejitterThereisnorequirementforphasejitter.4.1.11Distortion4.1.11.1QuantizingdistortionRequirement:Thequantizingdistortionshallnotexceed7,5quantizingdistortionunit(qdu).Moreover,withinthislimit,nomorethanoneAdaptiveDifferentialPulseCodedModulation(ADPCM)systemshallbeused.Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)124.1.11.2TotaldistortionThereisnorequirementfortotaldistortion.4.1.12SingletoneinterferenceThereisnorequirementforsingletoneinterference.4.1.13FrequencyerrorThereisnorequirementforfrequencyerror.4.1.14HarmonicdistortionThereisnorequirementforharmonicdistortion.4.1.15Echoandstability4.1.15.1Echo4.1.15.1.1EchocontroldevicesRequirement:Inordertofacilitatedatatransmission,echocontroldevicesshallnotbeusedintheconnection.Test:Thereisnotest.Thisrequirementshallbecheckedusinginformationfromthenetworkplans.4.1.15.1.2TalkerechoRequirement:Withaninputsignallevelof-9dBminthefrequencyrange500Hzto2500Hzappliedattheinterface,withasourceimpedanceof600Ω,anycompositeechosignalreceivedatthenearendinterfaceshallbegreaterthan10dBbelowthesignalleveltransmittedintotheinterface(i.e.<-19dBm).Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.15.1.3ListenerechoRequirement:Withaninputsignallevelof-9dBminthefrequencyrange500Hzto2500Hzappliedattheinterface,withasourceimpedanceof600Ω,anycompositeechosignalreceivedatthefarendinterfaceshallbegreaterthan20dBbelowthereceivedlevelofthefundamentalsignal.Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.15.2StabilityRequirement:Anyleasedlineshallbestableoverthefrequencyrange0Hzto4000Hzforallterminatingconditions.NOTE:Theterm"allterminatingconditions"includesopenandshortcircuitandhighimpedanceterminations.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.SIST EN 300 448 V1.2.1:2004



ETSIETSIEN300448V1.2.1(2001-07)134.2InterfacepresentationThephysicalconnectionarrangementsshallnormallybebyasocketasspecifiedinclause4.2.1.However,atthespecificrequestoftheusertheconnection,arrangementsspecifiedinclause4.2.2shallbeprovided.4.2.1ConnectorspecificationRequirement:Thenetworkinterfaceshallprovidean8-contactsocketofthetypespecifiedinISO/IEC8877[1]andwithcontactassignmentsasspecifiedintable3.Table3:ContactassignmentsContactnumberNetworkinterface1Unused2Unused3Unused4&5Pair6Unused7Unused8UnusedTest:Thereshallbeavisualinspectionthatthesocketisofthecorrecttype.ThecontactassignmentsaretestedindirectlythroughthetestsinannexA.4.2.2HardwiredpresentationRequirement:
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