SIST EN 300 448 V1.2.1:2004
(Main)Access and Terminals (AT); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); Connection characteristics and network interface presentation
General Information
- Abstract
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.
- Status
- Published
- Publication Date
- 30-Sep-2004
- 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
Overview
SIST EN 300 448 V1.2.1:2004 is a Slovenian standard developed by the Slovenski inštitut za standardizacijo (SIST), based on the European Standard EN 300 448. It details the specification for ordinary quality voice bandwidth 2-wire analogue leased lines (A2O). This standard focuses on setting out the technical requirements for the public network interface and connection characteristics of these analogue leased lines, including the performance levels expected and test procedures for verifying compliance. The document is a revision of ETS 300 448, with improved safety-related provisions, and closely aligns with European regulatory frameworks for telecommunications.
Key Topics
- Connection Characteristics: Defines the parameters that constitute acceptable performance for ordinary quality 2-wire leased lines in the voice bandwidth range of 300 Hz to 3400 Hz. These parameters include overall loss, delay, noise, and echo performance.
- Network Interface Presentation: Specifies the physical and electrical characteristics required at the network termination point (NTP), including connector types and hardwired presentations.
- Test Procedures: Outlines the principles and methodologies for testing and verifying compliance with the standard’s requirements, such as overall loss, frequency distortion, power handling, and noise measurements.
- Safety and EMC: While the standard references safety requirements and electromagnetic compatibility (EMC), it explicitly excludes detailed safety, overvoltage, and EMC requirements, referring to other normative documents for these aspects.
Applications
This standard provides practical guidance for telecommunications providers and equipment manufacturers implementing or certifying ordinary quality voice grade leased line services over public networks. Specific applications include:
- Network Planning and Deployment: Facilitates the design and provisioning of leased lines with predictable, harmonized performance characteristics meeting regulatory requirements in Slovenia and across Europe.
- Interoperability: Ensures compatibility and interface consistency at the network termination point, supporting a wide range of terminal equipment used in voice and low-speed data applications.
- Conformity Assessment: Establishes clear test methods and parameters for evaluating whether an analogue leased line installation meets contractual performance criteria, supporting both acceptance testing and periodic verification.
- Supporting Open Network Provision (ONP): Assists in the implementation of open and efficient access to public telecommunications infrastructures, as mandated by European Directives on leased lines.
Related Standards
SIST EN 300 448 V1.2.1:2004 is designed to work in conjunction with other important international and European standards, including:
- EN 300 450: Defines the requirements for terminal equipment interfaces for both ordinary and special quality 2-wire analogue leased lines (A2O and A2S).
- ISO/IEC 8877: Specifies the ISDN Basic Access Interface connector and contacts, referenced for the 8-contact interface socket.
- ITU-T O.41: Describes the psophometer used for noise measurements on telephone-type circuits, instrumental for compliance testing.
- Relevant CENELEC Safety Standards: For product, installation, and operational safety standards not covered within the scope of this document (e.g., EN 60950).
Practical Value
Adopting SIST EN 300 448 V1.2.1:2004 ensures that 2-wire analogue leased line services deliver reliable and interoperable voice and data communication. The standard provides a foundation for regulated service delivery, supports the harmonization of technical characteristics across service providers, and underpins contractual arrangements with measurable, enforceable criteria. Network operators, system integrators, and service users benefit from improved service quality, interchangeability of equipment, and streamlined compliance with national and European telecommunications regulations.
Keywords: analogue leased line standard, 2-wire leased line, voice bandwidth, network interface specification, telecommunications compliance, SIST, EN 300 448, A2O, network termination point, conformity testing, telecommunications standards Slovenia, leased line performance.
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Frequently Asked Questions
SIST EN 300 448 V1.2.1:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); Connection characteristics and network interface presentation". This standard covers: 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.
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.
SIST EN 300 448 V1.2.1:2004 is classified under the following ICS (International Classification for Standards) categories: 33.040.50 - Lines, connections and circuits. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 448 V1.2.1:2004 is associated with the following European legislation: Standardization Mandates: T-147-2. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 448 V1.2.1:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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
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.:+33492944200Fax:+33493654716SiretN°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:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.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,anycompositeechosignalreceivedatthenearendinterf
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