ETSI EN 300 903 V8.0.1 (2000-09)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system (GSM 03.50 version 8.0.1 Release 1999)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 903 Version 8.0.1SIST EN 300 903 V8.0.1:2003en01-december-2003SIST EN 300 903 V8.0.1:2003SLOVENSKI
STANDARD
ETSIEN300903V8.0.1(2000-09)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);TransmissionplanningaspectsofthespeechserviceintheGSMPublicLandMobileNetwork(PLMN)system(GSM03.50version8.0.1Release1999)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)2(GSM03.50version8.0.1Release1999)ReferenceREN/SMG-110350Q8KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-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.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)3(GSM03.50version8.0.1Release1999)ContentsIntellectualPropertyRights.7Foreword.71Scope.81.1References.81.2Abbreviations.101.3Introduction.102Networkconfigurations.112.1General.112.2ModelofthePLMN.112.3Interfaces.112.4Configurationsofconnections.122.4.1Generalconfigurationsofconnections.122.4.2Referenceconfigurationstoillustratedelayandechocontrolissues.122.54-wirecircuitsinthePLMN.123Transmissionperformance.133.1OverallLoss/Loudnessratings.133.1.1ConnectionswithhandsetMSs.143.1.2ConnectionswithhandsfreeMSs.143.1.3ConnectionswithheadsetMSs.143.2StabilityLoss.153.3Delay.153.3.1General.153.3.2Sourcesofdelay.153.3.2.1ElementsofthePLMNthatcausedelay.153.3.2.2ElementsofthePSTNthatcausedelay.163.3.3Effectsofdelay.163.3.4AllocationofdelaytothePLMN.163.3.4.1AllocationofdelaytothePLMNwhenusingafullratesystem.163.3.4.2AllocationofdelaytothePLMNwhenusingahalfratesystem.163.3.5Delayofvariousnetworkconfigurations.173.3.5.1NationalandinternationalconnectionswithnoechocontrolinthePSTN(referenceconfigurationsA).173.3.5.2NationalandinternationalconnectionswithechocontrolinthePSTN(referenceconfigurationsB).173.3.5.3Connectionswherere-routeingleadstoasignificantincreaseintransmissionpathlength(referenceconfigurationsC).173.3.6DelayrelatedrequirementsontheMS.173.3.6.1FullrateMS.173.3.6.2HalfrateMS.173.3.6.3HandsfreeMS.173.4Echo.183.4.1General.183.4.2ElectricalechocontrolinthePLMN(ReferenceconfigurationsA).183.4.3AcousticechocontrolinthePLMN.183.4.3.1AcousticechocontrolinahandsfreeMS.193.4.3.2AcousticechocontrolinahandsetMS.193.4.3.3AcousticechocontrolinaheadsetMS.193.4.4Interactionbetweentandemechocontroldevices(referenceconfigurationsB&C).193.5Clipping.193.5.1General.193.5.2PropertiesofvoiceswitchesinthePLMN.193.5.3Problemsoftandemvoiceswitching.203.6Idlechannelnoise(handsetandheadsetMS).203.6.1Sending.203.6.2Receiving.20SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)4(GSM03.50version8.0.1Release1999)3.7Noisecontrast.203.7.1General.203.7.2ElementsofaPLMNwhichcancausenoisecontrastimpairment.213.7.3Reductionofnoisecontrast.213.7.3.1Reductionofnoisecontrastbylimitingthenoisereceivedbythemicrophone.213.7.3.1.1HeadsetMS.213.7.3.1.2HandsetMS.223.7.3.1.3HandsfreeMS.223.7.3.2Reductionofnoisecontrastbyinsertionofcomfortnoise.223.7.4Consequenceoftheintroductionofhighcomfortnoiselevelsonothervoice-operateddevices.223.8Sensitivity/frequencycharacteristics.223.8.1HeadsetandHandsetMSs.223.8.1.1Sending.223.8.1.2Receiving.233.8.2HandsfreeMS.233.8.2.1Sending.233.8.2.2Receiving.243.9Distortion(handsetandheadsetMS).243.9.1Sending.243.9.2Receiving.253.10Sidetone(handsetandheadsetMS).263.10.1Sidetoneloss.263.10.2Sidetonedistortion.263.11Out-of-bandsignals.263.11.1Discriminationagainstout-of-bandinputsignals.263.11.1.1HandsetandheadsetMS.263.11.1.2HandsfreeMS.263.11.2Spuriousout-of-bandsignals.273.11.2.1HandsetandheadsetMS.273.11.2.2HandsfreeMS.273.12Requirementsforinformationtones.273.13Crosstalk.273.13.1Nearandfarendcrosstalk.273.13.2Go/returncrosstalk.273.14MSAmbientNoiseRejection.283.14.1Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsetMS).283.14.2Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsfreeMS).283.14.3Half-Rate,(TCH-HS)MSandDual-Rate(TCH-FSandTCH-HS)MSAmbientNoiseRejection.28AnnexA(informative):ConsiderationsontheAcousticInterfaceoftheMobileStation.37A.1HandsfreeMS.37A.2HandsetMS.37A.3HeadsetMS.37A.4Inter-reactionwithDTX.37AnnexB(normative):Testconsiderations.38B.1Testsignals.38B.1.1Sinusoidalsignals.38B.1.2Artificialvoice.38B.2Testsignallevels.38B.2.1Sending.38B.2.1.1HandsetandheadsetMSs.38B.2.1.2OfficetypeHandsfreeMS.38B.2.1.3CartypeHandsfreeMS.39B.2.2Receiving.39B.3Testrooms.39B.3.1Anechoicroom.39SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)5(GSM03.50version8.0.1Release1999)B.4Testarrangement.40B.4.1Electro-acousticequipment.40B.4.2TestarrangementforhandsfreeMS.40B.4.2.1OfficetypehandsfreeMS.40B.4.2.2CartypehandsfreeMS.41B.4.2.3UseofHATSfortestingthereceivecharacteristicsofthecartypehandsfreeMS.42B.4.2.3.1EqualizationofHATS.42B.4.2.3.2Combinationofearsignals.43AnnexC(normative):Transmissionrequirementstesting.44C.1Loudnessratings.44C.1.1SendingLoudnessRating(SLR)–HandsetMS.44C.1.2SendingLoudnessRating(SLR)–HandsfreeMS.44C.1.3ReceivingLoudnessRating(RLR)–HandsetMS.44C.1.4ReceivingLoudnessRating(RLR)-HandsfreeMS.45C.2IdleChannelNoise.45C.2.1Sending.45C.2.2Receiving.45C.3Sensitivity/frequencycharacteristics.45C.3.1Sending-HandsetMS.45C.3.2Sending-HandsfreeMS.46C.3.3Receiving-Handset.46C.3.4Receiving-Handsfree.47C.4Distortion.47C.4.1Sending.47C.4.2Receiving.48C.5Variationofgainwithinputlevel.48C.5.1Sending.48C.5.2Receiving.48C.6Sidetone.48C.6.1Talkersidetone(STMR).48C.6.2Listenersidetone(LSTR).49C.7Sidetonedistortion.49C.8Out-of-bandsignals.49C.8.1Discriminationagainstout-of-bandinputsignalforhandsetandheadsetMS.49C.8.2Spuriousout-of-bandsignalsforhandsetandheadsetMS.49C.8.3Discriminationagainstout-of-bandsignalsforhandsfreeMS.49C.8.4Spuriousout-of-bandemissionsforhandsfreeMS.50C.9Acousticecholoss.50C.9.1Acousticecholoss-HandsetMS.50C.9.2Acousticecholoss-HandsfreeMS.50C.10DelayforhandsfreeMS.51C.10.1Uplink.51C.10.2Downlink.51C.10.3Result.52C.11Ambientnoiserejection.52C.11.1Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsetMS).53C.11.2Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsfreeMS).53C.11.3Half-Rate,(TCH-HS)MSandDual-Rate(TCH-FSandTCH-HS)MSAmbientNoiseRejection.53SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)6(GSM03.50version8.0.1Release1999)AnnexD(normative):MSdelayrequirementdefinition.54D.1FullrateMSdelayrequirementdefinition.54D.2HalfrateMSdelayrequirementdefinition.55AnnexE(informative):Adaptivegaincontrol.56AnnexF(informative):ChangeRequestHistory.57History.58SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)7(GSM03.50version8.0.1Release1999)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).Thepresentdocumentdescribesthetransmissionplanningaspectspertainingtothespeechservicewithinthedigitalcellulartelecommunicationssystem(Phase2+).ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version8.x.ywhere:8indicatesRelease1999ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:18August2000DateoflatestannouncementofthisEN(doa):30November2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31May2001DateofwithdrawalofanyconflictingNationalStandard(dow):31May2001SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)8(GSM03.50version8.0.1Release1999)1ScopeThepresentdocumentdescribesthetransmissionplanningaspectspertainingtothespeechserviceintheGSMPLMNsystem.Duetotechnicalandeconomicfactors,therecannotbefullcompliancewiththegeneralcharacteristicsofinternationaltelephoneconnectionsandcircuitsrecommendedbytheITU-T.Thepresentdocumentgivesguidanceastotheprecautions,measuresandminimumrequirementsneededforsuccessfulinterworkingofthePLMNwiththenationalandinternationalPSTN.Thepresentdocumentidentifiesanumberofrouteingandnetworkconfigurations.TheobjectiveistoreachaqualityascloseaspossibletoITU-TstandardsinordertosafeguardtheperformanceseenbyPSTNcustomers.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1999document,referencestoGSMdocumentsareforRelease1999versions(version8.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.04:"Digitalcellulartelecommunicationssystem(Phase2+);Signallingrequirementsrelatingtorouteingofcallstomobilesubscribers".[3]GSM06.01:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeechprocessingfunctions".[4]GSM06.10:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Transcoding".[5]GSM06.11:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[6]GSM06.12:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Comfortnoiseaspectforfullratespeechtrafficchannels".[7]GSM06.31:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;DiscontinuousTransmission(DTX)forfullratespeechtrafficchannels".[8]GSM06.32:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetection(VAD)".[9]GSM06.02:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions".[10]GSM06.20:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechtranscoding".[11]GSM06.21:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels".SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)9(GSM03.50version8.0.1Release1999)[12]GSM06.22:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".[13]GSM06.41:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".[14]GSM06.42:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;VoiceActivityDetection(VAD)forhalfratespeechtrafficchannels".[15]I-ETS300245-2:"IntegratedServicesDigitalNetwork(ISDN):Technicalcharacteristicsoftelephonyterminals:Part2:PCMA-Lawhandsettelephony".[16]ITU-TRecommendationG.103(1998):"Hypotheticalreferenceconnections".[17]ITU-TRecommendationG.111(1993):"Loudnessratings(LRs)inaninternationalconnection".[18]ITU-TRecommendationG.113(1993):"Transmissionimpairments".[19]ITU-TRecommendationG.114(1993):"Meanone-waypropagationtime".[20]ITU-TRecommendationG.121(1993):"Loudnessratings(LRs)ofnationalsystems".[21]ITU-TRecommendationG.122(1993):"Influenceofnationalsystemsonstability,talkerecho,andlistenerechoininternationalconnections".[22]ITU-TRecommendationG.131(1988):"Stabilityandecho".[23]ITU-TRecommendationG.165(1993):"Echocancellers".[24]ITU-TRecommendationG.223(1988):"Assumptionsforthecalculationofnoiseonhypotheticalreferencecircuitsfortelephony".[25]ITU-TRecommendationG.703(1991):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[26]ITU-TRecommendationG.711(1988):"Pulsecodemodulation(PCM)ofvoicefrequencies".[27]ITU-TRecommendationG.712(1992):"Transmissionperformancecharacteristicsofpulsecodemodulation".[28]ITU-TRecommendationG.167(1993):"AcousticEchoControllers".[29]ITU-TRecommendationM.1020(1993):"Characteristicsofspecialqualityinternationalleasedcircuitswithspecialbandwidthconditions".[30]ITU-TRecommendationM.1025(1993):"Characteristicsofspecialqualityinternationalleasedcircuitswithbasicbandwidthconditioning".[31]ITU-TRecommendationM.1030(1988):"Characteristicsofordinaryqualityinternationalleasedcircuitsformingpartofprivateswitchedtelephonenetworks".[32]ITU-TRecommendationsM.1040(1988):"Characteristicsofordinaryqualityinternationalleasedcircuits".[33]ITU-TRecommendationO.132(1988):"Specificationforaquantizingdistortionmeasuringapparatususingasinusoidaltestsignal".[34]ITU-TRecommendationP.11(1993):"Effectoftransmissionimpairments".[35]ITU-TRecommendationP.34(1993):"Transmissioncharacteristicsofhands-freetelephones".[36]ITU-TRecommendationP.38(1993):"Transmissioncharacteristicsofoperatortelephonesystems(OTS)".[37]ITU-TRecommendationP.50(1993):"Artificialvoices".[38]ITU-TRecommendationP.51(1993):"Artificialmouths".SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)10(GSM03.50version8.0.1Release1999)[39]ITU-TRecommendationP.64(1993):"Determinationofsensitivity/frequencycharacteristicsoflocaltelephone".[40]ITU-TRecommendationP.76(1988):"Determinationofloudnessratings;fundamentalprinciples".[41]ITU-TRecommendationP.79(1993):"Calculationofloudnessratings".[42]ITU-TRecommendationQ.35(1988):"Technicalcharacteristicsoftonesforthetelephoneservice".[43]ITU-TRecommendationQ.551(1994):"Transmissioncharacteristicsofdigitalexchanges".[44]ITU-TBlueBook(1988):"VolumeV,Supplement13:Noisespectra".[45]ISO3(1973):"Preferrednumbers–seriesofpreferrednumbers".[46]ITU-TRecommendationP.57(1996):"ArtificialEars".[47]ITU-TRecommendationP.58(1993):"HeadandTorsoSimulatorforTelephonometry".[48]I-ETS300245-3:"IntegratedServicesDigitalNetwork(ISDN):Technicalcharacteristicsoftelephonyterminal:Part3:PCMA-lawloudspeakingandhandsfreetelephony".1.2AbbreviationsInadditiontothosebelow,theabbreviationsusedinthepresentdocumentarelistedinGSM01.04.ADCAnaloguetoDigitalConverterADPCMAdaptiveDifferentialPulseCodeModulationAECAcousticEchoControlBSCBaseStationController(excludingtransmissionsystemsBTSBaseTransceiverStation(excludingtransmissionsystems)DACDigitaltoAnalogueConverterDMRDigitalMobileRadioDSIDigitalSpeechInterpolationEECElectricEchoControlELEchoLossERPEarReferencePointFDMFrequencyDivisionMultiplexISCInternationalSwitchingLELocalExchangeLSTRListenerSidetoneRatingMRPMouthReferencePointOLROverallLoudnessRatingPCMPulseCodeModulationPOIPointofInterconnection(withPSTN)RLRReceiverLoudnessRatingSLRSendLoudnessRatingSTMRSidetoneMaskingRatingUPCMI13-bitUniformPCMInterface1.3IntroductionSincethetransmissionqualityandtheconversationalqualityofthePLMNwillingeneralbelowerthanthequalityofthePSTNconnectionduetocodingdistortion,delay,etc.,onlysometransmissionaspectscanbebroughtinlinewithITU-TRecommendations.Itisthereforenecessarytoimprovetheoverallqualityasmuchaspossiblebyimplementingproperrouteingandnetworkconfigurations.ItshouldberecognizedthatthetransmissionplanfortheGSMPLMNcannotleadtomajorchangesinthePSTN.However,itisimportanttousetheimprovementsintheevolvingPSTN(e.g.digitalization,introductionofechocancellers)inaneffectiveway.SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)11(GSM03.50version8.0.1Release1999)Thetransmissionrequirementsareinthefirstplacebasedoninternationalconnections.Whenthequalityissufficientforinternationalconnections,itcanbeassumedthatthenationalconnectionswillhavethesameorbetterquality.Inordertoobtainasufficientqualityintheconnection,itispreferabletohavedigitalconnectivitybetweentheBaseStationSystem(BSS)andtheinternationalexchange.ThePLMNrequirementsarebasedonthisassumption.Whenthissituationcannotbeprovided,alowerqualitymusttemporarilybeaccepted.Thepresentdocumentconsistsoftwoparts:onewilldealwithnetworkconfigurations,theotherwithtransmissionperformance.Thepartaboutnetworkconfigurationsgivesinformationaboutthereferenceconnections,onwhichthetransmissionplanisbased.Furthermore,someguidelinesarepresentedforimprovementofthetransmissionqualityintheevolving(digital)PSTN.ThepartabouttransmissionperformancegivesmainlycharacteristicsofthetransmissionbetweenMSacousticinterface(MRP/ERP)andtheinterfacebetweenthePLMNandthePSTN(POI).Fortransmissionaspectswhereitisimpossibletogiveoverallcharacteristics,itisinsomecasesnecessarytomakerecommendationsforindividualpartsoftheequipment.AnnexAconsiderstheeffectsofthetypeofacousticinterfacesoftheMS.2Networkconfigurations2.1GeneralThebasicconfigurationfortheinterworkingwiththePSTNisshowninfigure1.2.2ModelofthePLMNAmoredetailedmodelofthePLMNusedfortheconsiderationoftransmissionplanningissuesforspeechisshowninfigure2.Thismodelrepresentsthemainfunctionsrequiredanddoesnotnecessarilyimplyanyparticularphysicalrealization.RouteingofcallsisgiveninGSM03.04.Anyacousticechocontrolisnotspecificallyshownasitwillbeprovidedbyanalogueprocessingofdigitalprocessingoracombinationofbothtechniques.2.3InterfacesThemaininterfacesidentifiedwithintheGSMspecificationsareshowninfigure1.Forthepurposesofthepresentdocument,theAirInterfaceandthePointofInterconnect(POI)areidentifiedalongwithtwootherinterfaces,InterfaceZanda13-bitUniformPCMInterface(UPCMI).TheseinterfacesareneededtodefinethePLMNtransmissioncharacteristicsandtheoverallsystemrequirements.TheAirInterfaceisspecifiedbyGSM05seriesspecificationsandisrequiredtoachieveMStransportability.Analoguemeasurementscanbemadeatthispointbyusingtheappropriateradioterminalequipmentandspeechtranscoder.Thelossesandgainsintroducedbythetestspeechtranscoderwillneedtobespecified.ThePOIwiththePSTNwillgenerallybeatthe2048kbits/slevelataninterface,inaccordancewithITU-TRecommendationG.703.Atthepoint,whichisconsideredtohavearelativelevelofOdBr,theanaloguesignalswillberepresentedby8-bitA-law,accordingtoITU-TRecommendationG.711.Analoguemeasurementsmaybemadeatthispointusingastandardsendandreceiveside,asdefinedinITU-TRecommendations.InterfaceZmightbeusedinthecaseofdirectMSCtoMSCconnections.InterfaceZisofthesamenatureasthePOI.TheUPCMIisintroducedfordesignpurposesinordertoseparatethespeechtranscoderimpairmentsfromthebasicaudioimpairmentsoftheMS.SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)12(GSM03.50version8.0.1Release1999)2.4Configurationsofconnections2.4.1GeneralconfigurationsofconnectionsFigure3showsavarietyofconfigurationsofconnections.ThereareanumberofPSTNfeatureswhichshouldbeavoidedfromsuchconnections.Theseinclude:1)echocontroldevicesintheinternationalnetwork.Ifpresent,andnotdisabled,thesedeviceswillbeintandemwithPLMNechocancellersandmayintroducedegradation;2)satelliterouteings.ThedelayinherentintheconnectionswhenaddedtothePLMNdelay,mayresultinconversationaldifficulties.Doublesatellitelinksarelikelytocauseseveredifficultiesandspecialprecautionsshouldbetakentoavoidthissituationundercallforwardingarrangements;3)DigitalSpeechInterpolationsystems(DSI).ThereislikelytobeanadverseinteractionbetweenDSIandDTX;4)ADPCM.ThedistortionintroducedbyADPCMonrouteswherePSTNechocontrolisnotprovidedislikelytoreducetheechocancellationprovidedbythePLMNelectricechocanceller;5)significantdifferencesinclockratesonnon-synchronizeddigitalnetworkcomponents.TheresultingphaserollandslipsarelikelytodegradetheperformanceofthePLMNechocanceller;6)thoseanalogueFDMrouteingswhichexhibitphaseroll.AnyphaserollduetotheabsenceofsynchronizationbetweenthecarrierfrequenciesonthetwodirectionsoftransmissionislikelytodegradetheperformanceofthePLMNechocanceller;7)tandemconnectionsofsourcesofquantizationdistortion.ThePLMNspeechtranscoderisestimatedtobeequivalentto7QDUsbetweenuniformPCMinterfaces(seeITU-TRecommendationG.113).Itisrecognizedthatonsomeconnectionsitmaynotbefeasibletoavoidthesefeatures,butinmanycases,especiallyiftakenintoaccountattheplanningstage,thisshouldbepossible.2.4.2ReferenceconfigurationstoillustratedelayandechocontrolissuesThreebasicreferenceconfigurationtypesshowninfigures4to6aredefinedtoillustratedelayandechocontrolissues.IntermediateechocontroldevicesasshowninthefiguresaredisabledbyappropriatesignallingbetweentheMSCandISCorMSCandMSC.ReferenceconfigurationsA(seefigure4)representnationalorinternationalconnectionswherethereisnoechocontroldeviceinthePSTN.Thesereferenceconfigurationsincludere-routeingconfigurationswheretheoveralldelayofthetransmissionpathhasnotbeenextended.ReferenceconfigurationsB(seefigure5)representnationalorinternationalconnectionswhereechocontrolisprovidedinthePSTN.Thesereferenceconfigurationsincludere-routeingconfigurationswheretheoveralldelayofthetransmissionpathhasnotbeenextended.ReferenceconfigurationsC(seefigure6)representnationalorinternationalconnectionswherere-routeinghasleadtoanincreaseintheoveralldelayofthetransmissionpathbeyondrecommendedlimits.2.54-wirecircuitsinthePLMNAsshowninfigure2,thePLMNwillusuallycontaintransmissionsystems.Wherepresent,theyshouldprovide4-wirecircuits.Inthecaseofdigitalcircuitswhichdonotincludeanyspeechprocessingdevices,theoverallsystemrequirementsofthePLMNwillnotbeaffectedbythepresenceofthelink.Inthecaseofanaloguelinks,thetransmissioncharacteristics(e.g.attenuation,attenuationdistortion,noise)willaffecttheoverallsystemrequirementsofthePLMN.ITU-TRecommendationsM.1020,M.1025,M.1030andM.1040describeseveraltransmissioncharacteristicsforleasedcircuits.Incaseswheretheanaloguelinkintroducesloss,provisionwillhavetobemadeattheinterfacetorestoretheloss.SIST EN 300 903 V8.0.1:2003

ETSIETSIEN300903V8.0.1(2000-09)13(GSM03.50version8.0.1Release1999)3TransmissionperformanceTheoveralltransmissionperformanceofconnectionsinalternateconversationmodecanbeconsideredasasummationoftheeffectsof:1)theaudiopartbetweentheMRP/ERPandtheUPCMIinterface;2)thespeechtranscoderpartincludingtheeffectsofradiotransmission,andspeechprocessingbetweentheUPCMIandthePOI;3)theoverallcharacteristicsoftheconnectionbetweenPOIandtheotheruser.Thereisnotonlyalinearadditionoftheseeffectsbutthereisalsoaninfluencefromdifferentpartsoftheconnectionontheperformanceofthespeechtranscoderandotherspeechprocessingdevices.Wherepossible,thetransmissionperformanceisspecifiedbetweentheMRP/ERPandthePOI.Wherethisisnotpossible,thetransmissionaspectsoftheaudiopartmentionedabovehavebeenspecified.ThetransmissionaspectsofthespeechtranscoderarespecifiedinGSM06seriesspecifications.Inthefollowingparagraphs,requirementsarespecifiedfortheUPCMI,theAirInterfaceorthePOIasappropriate.ThetransmissionrequirementsoftheMShavebeenderivedfromtherequirementsofdigitaltelephonesstatedinI-ETS300245-2and3.MSswillhavetoworkinavarietyofenvironmentsrangingfromquietofficelocationstoverynoisyenvironmentsasfoundinmovingcars.Innoisyconditions,differentvaluesforthesendingandreceivingsensitivitiesrelativetothenominalvaluescanincreasetheperformanceoftheterminal.SomeguidanceisgiveninannexE.Theoveralltransmissionperformanceinfullduplexconversationmodewillalsogreatlydependontheperformanceoftheechocontroldeviceswhichmaybeincludedintheconnection.Thehandsfreerequirementsinthepresentdocumentaredesignedtoprovideabasiclevelofperformanceandtoavoidadverseinteractionswithothernetworks.Testingiscarriedoutinoneconfigurationinavehicle,whilstthisgivessomeconfidencethatthesystemcanworkinatypicalenvironment,thetestingisbynomeanscomplete.Itisassumedthatthemanufacturersubmitsthehandsfreesystemwiththetransducersfittedinreasonablelocationswithinthevehicle(thetransducersshouldnotimpedethenormaloperationofthevehicleoritsfittings).UnusualinstallationsshouldbeagreedforsuitabilitywiththerelevantTypeApprovalAuthoritybeforetesting.Inarealvehicleinstallation,careshouldbetakentoallowfortheacousticpropertiesofthatvehicleandthelikelyacousticenvironment.ItisimportantthatthebestpossiblecouplingbetweenthemicrophoneandtheMSuserisachieved.Hencethemicrophoneshouldbedirectionalandmountedasclosetotheuser'smouthaspractical.Theloudspeakersshouldbemountedinsuchawaythatthemaximumreceivesignalisdirectedattheuser,ratherthandissipatedbythevariousobstaclesinthatvehicle,suchastheseats.Properconsiderationforthenoiseenvironmentandthedirectcouplingbetweenthemicrophoneandloudspeakersisnecessary.ExcessivenoisecoupledintothemicrophonecanmasktheMSuser'ssendspeechandpotentiallyaffecttheoperationofDTX.Thevehiclenoiseenvironmentcanpotentiallymaskthereceivedspeech,unlesssufficientvolumeisprovided.However,directcouplingbet
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