SIST EN 300 451 V1.2.1:2004

• 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 300 451 to improve the safety related text following a liaison from TC Safety.

• 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 300 451 V1.2.1 (2001-07) - Access and Terminals (AT); Ordinary quality voice bandwidth 4-wire analogue leased line (A4O); Connection characteristics and network interface presentation

SIST EN 300 451 V1.2.1:2004 is the SIST adoption of ETSI EN 300 451 for Access and Terminals (AT). It specifies the public network side of the interface for ordinary quality voice bandwidth 4-wire analogue leased line (A4O) service, including connection characteristics, network interface presentation, and compliance test procedures. It is intended for leased line providers, network interface designers, and anyone checking conformity at the Network Termination Point (NTP).

What does SIST EN 300 451 V1.2.1:2004 specify?

SIST EN 300 451 V1.2.1:2004 specifies the technical requirements and test principles for the connection characteristics and the physical and electrical characteristics of the network interface presentation for ordinary quality, voice bandwidth, 4-wire analogue leased lines. Safety, overvoltage, and EMC aspects are outside its scope.

The standard applies to leased lines that form part of the minimum set under the ONP framework and that present a point-to-point connection through NTPs. It is written for lines used mainly for telephony, but it also allows other traffic. The document is organized into scope, references, definitions and abbreviations, and requirements and tests, followed by annexes with test methods and explanatory material.

Annex	What it covers
Annex A	Normative test methods
Annex B	Weighted return loss measurements
Annex C	Overall loss and quantizing distortion
Annex D	Availability
Annex E	Bibliography

What are the key requirements of SIST EN 300 451 V1.2.1:2004?

SIST EN 300 451 V1.2.1:2004 sets the main service and interface limits that a public network leased line must meet. In practice, these limits tell a provider what must be measured at the NTP and what the line must be able to carry without excessive loss, delay, noise, or interface mismatch.

• Overall loss - Clause 4.1.2 limits overall loss at 1020 Hz to a range from 0 to 21 dB with the line terminated in 600 ohms at each end. This gives a basic check that the circuit is usable and not excessively attenuating the signal.
• Frequency response - Clause 4.1.3 controls loss/frequency distortion over the voice band. This matters because speech and voice-band services need the line to pass different frequencies in a reasonably even way.
• Signal handling - Clause 4.1.4 requires the line to carry a mean input power of -13 dBm across 300 Hz to 3400 Hz and an instantaneous power of 0 dBm. In practice, this sets the level the network should accept without clipping or overload.
• Transmission delay - Clause 4.1.5 sets a one-way end-to-end delay limit, with separate limits for terrestrial and satellite connections. This matters for conversation quality and for any application sensitive to latency.
• Noise and stability - Clause 4.1.8 limits random circuit noise, and clause 4.1.7.2 limits variation of overall loss with time. These clauses matter because a line must remain stable and quiet over normal service life.
• Quantizing distortion - Clause 4.1.11.1 limits quantizing distortion to 7.5 qdu and allows no more than one ADPCM system within that limit. This is important where digital conversions are part of the path.
• Interface presentation - Clause 4.2.1 requires an 8-contact socket to ISO/IEC 8877, and clause 4.2.2 allows a hardwired presentation with solid conductors of the stated wire range. This tells equipment builders how the network side must be presented physically.
• Return loss and power feeding - Clause 4.2.3 requires return loss, or weighted return loss, above 6 dB across 300 Hz to 3400 Hz, and clause 4.2.4 forbids power feeding between the network interface and terminal equipment interface. This matters for impedance matching and for preventing unintended powering arrangements.

What terms does SIST EN 300 451 V1.2.1:2004 define?

• Leased lines - Telecommunications facilities provided by a public telecommunications network with defined transmission characteristics between NTPs and without user-controlled switching.
• Network Termination Point (NTP) - The physical connection point and technical access specification that form part of the public network and provide access to it.
• Reference impedance ZR - The reference impedance used for testing in this standard, defined as 600 ohms.
• Voice bandwidth - The frequency band from 300 Hz to 3400 Hz.
• Group delay - The propagation time through the leased line at a given frequency, defined from phase shift.
• Group delay distortion - The difference between group delay at a given frequency and the minimum group delay in the band of interest.
• ADPCM - Adaptive Differential Pulse Coded Modulation, a digital coding method referenced in the quantizing distortion limit.
• ONP - Open Network Provision, the regulatory framework under which the leased line minimum set is addressed.

Who uses SIST EN 300 451 V1.2.1:2004?

SIST EN 300 451 V1.2.1:2004 is used by public telecommunications network operators, leased line providers, terminal equipment manufacturers, and test laboratories. It is also useful for conformity assessors and buyers who need to specify or verify the public network side of an A4O interface. In practice, they use it to design interfaces, run acceptance tests, document measured performance, and compare offered service characteristics with the standard’s limits.

What changed in SIST EN 300 451 V1.2.1:2004 from the previous edition?

SIST EN 300 451 V1.2.1:2004 revises ETS 300 451. The scope states that this revision improves the safety-related text following a liaison from TC Safety, and the foreword says the document introduces necessary changes.

Which standards are used with SIST EN 300 451 V1.2.1:2004?

• ISO/IEC 8877 - supplies the 8-contact socket type used for the network interface.
• ITU-T Recommendation O.41 - provides the psophometer used for random circuit noise measurement.
• ETSI EN 300 453 - the directly related terminal equipment interface standard for A4O and A4S.
• ITU-T Recommendation M.1040 - is cited as the basis for the connection characteristics.
• ITU-T Recommendation G.114 - underpins the transmission delay limit.
• ITU-T Recommendation G.122 - supports the weighted return loss method used in Annex B.
• ITU-T Recommendation V.2 - is cited for the instantaneous power value.

What does the SIST EN 300 451 V1.2.1:2004 document contain?

SIST EN 300 451 V1.2.1:2004 contains tabulated limits, figures, and test setups for line performance and interface presentation. Annex A gives the test configurations and stimulus/monitor conditions for overall loss, frequency distortion, delay, noise, instantaneous power, return loss, and power feeding. Annex B explains weighted return loss and gives calculation methods, including a formula and a worked example. Annex C describes factors that affect overall loss and quantizing distortion, with illustrative examples of how leased lines are built. Annex D explains availability terms and gives indicative availability figures.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); Ordinary quality voice bandwidth 4-wire analogue leased line (A4O); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 451 Version 1.2.1SIST EN 300 451 V1.2.1:2004en01-oktober-2004SIST EN 300 451 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300451V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Ordinaryqualityvoicebandwidth4-wireanalogueleasedline(A4O);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)2ReferenceREN/AT-010004KeywordsONP,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 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.74Requirementsandtests.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.104.1.6Group-delaydistortion.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.124.2Interfacepresentation.124.2.1Connectorspecification.124.2.2Hardwiredpresentation.134.2.3Returnloss.134.2.4Powerfeeding.134.3Safety.134.4Overvoltage.144.5ElectroMagneticCompatibility(EMC).144.6Availability.14AnnexA(normative):Testmethods.15A.1General.15A.1.1Equipmentconnection.15A.1.2Referenceimpedance.15A.1.3Measurementfrequency.15A.2TestMethods.16A.2.1Overallloss.16A.2.2Loss/frequencydistortionandmaximummeaninputpower.16A.2.3Transmissiondelay.17A.2.4Randomcircuitnoise.18SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)4A.2.5Maximuminstantaneouspower.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 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(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:-EN300453:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth4-wireanalogueleasedlines(A4OandA4S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC),concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworksandtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlineswithinandbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC,laterreplacedby98/13/EC,terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationM.1040wasusedasthebasisfortheconnectioncharacteristics.SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfacepresentationofordinaryquality,voicebandwidth,4-wire,analogueleasedlines,providedaspartoftheminimumsetundertheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/94/EEC).AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocumentalthoughinpracticetheoverallperformancemaybeconsiderablybetter.Theleasedlineprovidesaccesstothevoicebandwidth(300Hzto3400Hz)withnorestrictionsontheuseofthefrequencies.Therequirementsofthepresentdocumenthavebeenchosenprimarilyforthetransmissionoftelephonyalthoughthereisnorestrictionontheuseoftheleasedlineforothertypesoftraffic.Thepresentdocumentisapplicableforleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thetestsspecifiedinthepresentdocumentcannotbecarriedout,norcanperformancebemonitoredbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryinguser'straffic.Thusthetestsaredesignedforbringingintoandreturningintoservice,althoughthereisnoobligationtoperformthesetestseachtimetheleasedlineisbroughtintoorreturnedintoservice.Thepresentdocumentcoversthephysical,mechanicalandelectricalcharacteristicsofthenetworkinterfaceandspecifiestheconformancetestsfortheconnectioncharacteristicsandnetworkinterface.Someofthetestsdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ISO/IEC8877(1992):"Informationtechnology.Telecommunicationsandinformationexchangebetweensystems.InterfaceconnectorandcontactassignmentsforISDNBasicAccessInterfacelocatedatreferencepointsSandT".[2]ITU-TRecommendationO.41(1994):"Psophometerforuseontelephone-typecircuits".SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)73Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:groupdelay:measureofthepropagationtimethroughtheleasedline.Foragivenfrequency,itisequaltothefirstderivativeofthephaseshiftthroughtheleasedline,measuredinradians,withrespecttotheangularfrequencymeasuredinradianspersecondgroupdelaydistortion:differencebetweengroupdelayatagivenfrequencyandminimumgroupdelay,inthefrequencybandofinterestleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkreferenceimpedanceZR:thisis600Ω.SeealsoclauseA.1.2terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationnetwork;i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationnetwork,inordertosend,process,orreceiveinformationvoicebandwidth:bandoffrequenciesovertherange300Hzto3400Hz3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:aReturnlossindBaf()ReturnlossatfrequencyfindBawWeightedreturnlossindBAf()ReturnlossatfrequencyfexpressedasaratioA40Ordinaryqualityvoicebandwidth4-wireanalogueleasedlineADPCMAdaptiveDifferentialPulseCodedModulationEMCElectroMagneticCompatibilityffrequencyNTPNetworkTerminationPointONPOpenNetworkProvisionqduquantizingdistortionunitrmsrootmeansquareRXReceiveisasignalinput(ateithertheleasedlineinterfaceorthetestequipment)TXTransmitisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment)ZRReferenceimpedanceSIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)84Requirementsandtests4.1ConnectioncharacteristicsTheordinaryqualityvoicebandwidth4-wireanalogueleasedlineisabidirectionalline,configuredpoint-to-point,nominallycoveringthevoicebandwidth.Theconnectionis,ingeneral,symmetrical,i.e.eachdirectionoftransmissionhasthesamenominalcharacteristics,althoughtheactualvaluesareindependent.4.1.1TabulationofconnectioncharacteristicsTheparametersdefiningthecharacteristicsoftheconnectionaregivenintable1.Thesecharacteristicsdefinetheserviceoffered.Table1:NetworkperformancecharacteristicsDescriptionNatureReferenceclauseOverallloss0≤overallloss≤21dB4.1.2Loss/frequencydistortiontable2,figure14.1.3Transmissionsignals-maximummeaninputpower-maximuminstantaneouspower-signalpowerina10Hzbandwidth-maximuminputpoweroutsidevoiceband-13dBm0dBmnorequirementnorequirement4.1.44.1.4.14.1.4.24.1.4.34.1.4.4Transmissiondelay-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;≤1ADPCMsystemnorequirement4.1.114.1.11.14.1.11.2Singletoneinterferencenorequirement4.1.12Frequencyerrornorequirement4.1.13Harmonicdistortionnorequirement4.1.14NOTE:Wheretheoutputrelativelevelisnotdefined,analternativevalueisspecifiedinthereferenceclause.4.1.2OveralllossRequirement:Theoverallloss,includinglongtermvariations,presentedtoasignalfrequencyof1020Hzsentatapowerof-13dBmineachdirectionoftransmissionwiththelineterminatedin600Ωateachend,shallbeintherange:0≤overallloss≤21dB.NOTE:Theoveralllossineachdirectioncanbedifferent.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)94.1.3Loss/frequencydistortionRequirement:Theoveralllossrelativetothatdefinedinclause4.1.2abovefortheconnection,presentedtoasignalsentatapowerlevelof-13dBmwiththelineterminatedin600Ωateachend,shallliebetweenthelimitsgivenintable2andfigure1.Below400Hzandabove3600Hz,therelativelossshallnotbelessthan-4dBand0dBrespectively,butisotherwiseunspecified.Table2:Limitsforlossofthecircuitrelativetothatat1020HzUpperlimitLowerlimitPoint(seefigure1)FrequencyHzRelativelossdBPoint(seefigure1)FrequencyHzRelativelossdBA4009E400-4B20009F400-3C200016G3600-3D280016H360003002000FrequencyHz40036000916-32800ABCDGHelativelossdB1020-4EFFigure1:Limitsforlossofthecircuitrelativetothatat1020HzTest:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.4Transmissionsignals4.1.4.1MaximummeaninputpowerRequirement:Theleasedlineshallbecapableofcarryinganysignalpresentedattheinputataoneminutemeanpowerlevelof-13dBmwithinavoicebandwidthof300Hzto3400Hzwiththelineterminatedin600Ωateachend.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)104.1.4.2MaximuminstantaneouspowerRequirement:Theleasedlineshallbecapableofcarryingasignalattheinputhavingamaximumvalueequaltoaninstantaneouspowerwhichis13dBabovethemeanvalueof-13dBm(i.e.0dBm).NOTE:ThisvalueisbaseduponaprovisionalITU-Tvalue.SeeITU-TRecommendationV.2.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.1.4.3Maximumpowerina10HzbandwidthThereisnorequirementformaximumpowerina10Hzbandwidth.NOTE:However,thereisacorrespondingrequirementontheterminalequipmentspecifiedinEN300453.4.1.4.4MaximuminputpoweroutsidethevoicebandNOTE:Theleasedlineinterfaceisnotsuitableforthehandlingofsignalsbelow300Hzandabove3400Hz.Outofbandsignalsfromtheterminalequipmentarelimitedtoavoidtroubleinthenetwork(seeterminalequipmentinterfacerequirementinEN300453).4.1.5TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolvedtheonewayend-to-enddelayshallbelessthan(15+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure2;orb)forconnectionswheresatellitetransmissionisinvolvedtheonewayend-to-enddelayshallbelessthan350ms.NOTE:Requirementsa)andb)arebasedonannexesA.2andA.3ofITU-TRecommendationG.114withsuitableadjustmenttorequirementa)toallowforthepossibleuseofloadedcable.Delay(ms)Geographicaldistance(km)100090003000600010015Figure2:UpperlimitofdelayTest:ThetestshallbeconductedaccordingtoclauseA.2.3.SIST EN 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)114.1.6Group-delaydistortionThereisnorequirementforgroupdelaydistortion.NOTE:Groupdelaydistortionisnotconsideredtobeimportantforvoicecommunication.Terminalequipmentforotherpurposeswhichwishtomakeuseofleasedlinesconformingtothepresentdocumentwillneedtocompensateforpossibleshortcomingsduetogroupdelaydistortion.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-13dBmatafrequencyof1020Hzintothefarendoftheleasedline.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 300 451 V1.2.1:2004

ETSIETSIEN300451V1.2.1(2001-07)124.1.11.2TotaldistortionThereisnorequirementfortotaldistortion.4.1.12SingletoneinterferenceThereisnorequirementforsingletoneinterference.4.1.13FrequencyerrorThereisnorequirementforfrequencyerror.4.1.14HarmonicdistortionThereisnorequirementforharmonicdistortion.4.2InterfacepresentationThephysicalconnectionarrangementsshallnormallybebyasocketasspecifiedinclause4.2.1;howeveratthespecificrequestoftheusertheconnectionarrangementsspecifiedinclause4.2.2shallbeprovided.4.2.1ConnectorspecificationRequirement:Thenetworkinterfaceshallprovidean8-contactsocketofthetypespecifiedinISO/IEC8877[1]andwithcontactassignmentsasspecifiedintable3.Table3:ContactassignmentContactNetworkinterface1Unused2Unused3&6Receivepair4&5Transmitpair7Unused8UnusedNOTE:Thetransmitpairistheoutputfromthenetworkinterface.Thereceivepairistheinputtothenetworkinterfaceasshowninfigure3.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertothenetworkinterface.TXRXRXTXTERMINALEQUIPMENTINTERFACENET
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