SIST EN 300 448 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 300 448 to improve the safety related text following a liaison received 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 300 448 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

SIST EN 300 448 V1.2.1:2004 is the Slovenian adoption of ETSI EN 300 448 V1.2.1 for ordinary quality voice bandwidth 2-wire analogue leased lines (A2O). It specifies the public network side of the interface, the service performance of the leased line, and the test principles used to check compliance for network operators, leased line providers, and terminal equipment at the Network Termination Point (NTP).

What does SIST EN 300 448 V1.2.1:2004 specify?

SIST EN 300 448 V1.2.1:2004 covers the technical requirements and test principles for the connection characteristics and the physical and electrical characteristics of the network interface presentation for A2O leased lines. The leased line is bi-directional, point-to-point, and intended to carry voice-band traffic over 300 Hz to 3400 Hz, with telephony as the main use.

The document applies to leased lines, including part-time leased lines, where establishment or release does not need protocol exchange or other intervention at the NTP. It also states that the tests are aimed at bringing a line into service and returning it to service, not at live performance monitoring while user traffic is carried.

It organizes the material into the main clauses on scope, references, definitions, requirements, and then annexes A to E.

Annex	What it covers
A	Normative test methods for loss, distortion, noise, stability, return loss, and power feeding
B	Informative weighted return loss measurements and calculation methods
C	Informative background on overall loss and quantizing distortion
D	Informative availability concepts and example figures
E	Informative bibliography

What are the key requirements of SIST EN 300 448 V1.2.1:2004?

The core of SIST EN 300 448 V1.2.1:2004 is a set of transmission limits for the leased line and interface presentation. In practice, these are the values a provider, test lab, or buyer can use to check whether a line is suitable for service and whether the interface is presented in the expected form.

Connection quality and loss

Clause 4.1.2 requires overall loss, measured at 1020 Hz with -9 dBm and 600 Ω terminations, to stay between 0 dB and 25 dB. Clause 4.1.3 sets the loss/frequency distortion limits across 300 Hz to 3600 Hz. This matters because it describes how flat the line response must be for voice use.

Signal handling and delay

Clause 4.1.4 allows a mean input power of -9 dBm and an instantaneous input power peak of +4 dBm. Clause 4.1.5 limits one-way delay to less than (15 + 0.01G) ms for terrestrial paths or less than 350 ms when satellite transmission is involved. Clause 4.1.15 requires the line to remain stable from 0 Hz to 4000 Hz under open, short, and high-impedance terminations. In practice, these clauses tell the user what speech and data-like signals the line can carry without overload or instability.

Noise, distortion, and echo

Clause 4.1.8 limits random circuit noise, and clause 4.1.11 limits quantizing distortion to 7.5 qdu, with no more than one ADPCM system. Clause 4.1.15 also sets echo-related limits and states that echo control devices shall not be used in the connection. This is important where voice quality, modem compatibility, or echo sensitivity matters.

Interface presentation and feeding

Clause 4.2.1 requires an 8-contact socket of the ISO/IEC 8877 type, with contact pair 4 and 5 used for the line. Clause 4.2.2 allows a hardwired presentation on request, using suitable contacts for solid conductors of 0.4 mm to 0.6 mm wire diameter. Clause 4.2.3 sets the return loss requirement, either directly or as weighted return loss using Annex B. Clause 4.2.4 states that the network interface shall not feed power to terminal equipment and shall not require power from it.

What terms does SIST EN 300 448 V1.2.1:2004 define?

• A2O - Ordinary quality voice bandwidth 2-wire analogue leased line.
• Network Termination Point (NTP) - The physical network point and access specification where the public network is presented.
• Reference impedance (ZR) - A complex impedance made from 270 Ω in series with a parallel 750 Ω and 150 nF combination.
• Voice bandwidth - The 300 Hz to 3400 Hz frequency range used for voice-band transmission.
• Group delay - The propagation time through the leased line, expressed through phase shift versus angular frequency.
• Group delay distortion - The difference between group delay at a given frequency and the minimum group delay in the band of interest.
• Quantizing distortion unit (qdu) - The unit used to express quantizing distortion in the line.

Who uses SIST EN 300 448 V1.2.1:2004?

SIST EN 300 448 V1.2.1:2004 is used by leased line providers, public network operators, and engineers who design or assess the public network side of analogue leased lines. It is also relevant to terminal equipment manufacturers, test laboratories, and quality or procurement teams that need to check the interface presentation, transmission performance, noise, delay, echo, and return loss against a defined service.

What changed in SIST EN 300 448 V1.2.1:2004 from the previous edition?

SIST EN 300 448 V1.2.1:2004 revises ETS 300 448 and updates the safety-related text following a liaison from TC Safety.

Which standards are used with SIST EN 300 448 V1.2.1:2004?

• ISO/IEC 8877 - Defines the 8-contact socket and contact assignments used for the network interface.
• ITU-T Recommendation O.41 - Provides the psophometer used for random circuit noise measurements.
• ETSI EN 300 450 - Defines the terminal equipment interface for ordinary and special quality 2-wire analogue leased lines and is the direct companion standard.

What does the SIST EN 300 448 V1.2.1:2004 document contain?

The document contains a tabulated set of connection characteristics, limits, and references in the main clause on requirements. It also gives test set-ups and procedures in Annex A for overall loss, loss/frequency distortion, maximum instantaneous power, random circuit noise, stability, return loss, and power feeding.

Annex B provides the weighting function and calculation methods for weighted return loss. Annex C explains how overall loss and quantizing distortion arise in analogue leased lines and shows typical network arrangements. Annex D gives availability concepts and example figures, while Annex E lists background references.

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.:[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,anycompositeechosignalreceivedatthenearendinterf
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