SIST EN 300 450 V1.2.1:2004
(Main)Access and Terminals (AT); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface
General Information
- Abstract
Specification of the terminal equipment side of the interface and test procedures for compliance. Revision of ETS 300 450 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 300 450 V1.2.1:2004 is a European standard focused on the interface specifications and test procedures for terminal equipment connecting to ordinary (A2O) and special (A2S) quality voice bandwidth 2-wire analogue leased lines. Developed by the Slovenski inštitut za standardizacijo (SIST) in alignment with ETSI guidelines, this standard ensures compatibility and interoperability between terminal equipment and public telecommunications networks, while emphasizing compliance with Open Network Provision (ONP) requirements. The revision also addresses and clarifies safety-related clauses as highlighted by TC Safety.
Key Topics
- Terminal Equipment Interface: Defines the required connection methods, including 8-contact plugs (according to ISO/IEC 8877), screw terminal blocks for solid conductors, and appropriate wiring arrangements.
- Physical and Electrical Characteristics: Specifies requirements for impedance, return loss, longitudinal conversion loss, and power feeding. These help maintain signal quality and minimize interference.
- Transmission Signal Parameters: Outlines classifications for signal sourcing-including acoustic input, internally generated electrical signals, and through-connecting equipment-to ensure a consistent interface regardless of equipment category.
- Testing Procedures: Provides normative annexes detailing measurement and compliance test methods for key parameters like return loss, sending loudness rating (SLR), maximum mean power, and instantaneous power.
- Scope Limitation: Excludes detailed safety, overvoltage, and EMC (ElectroMagnetic Compatibility) requirements, which are covered by related CENELEC and ETSI standards.
- Harmonization with ONP: Ensures ONP-leased lines in the EU offer a minimum set of harmonized technical characteristics, facilitating open, reliable access for voice services.
Applications
This standard is practically applied in scenarios where terminal equipment, such as telephony devices, modems, answering machines, or transmission apparatus, must connect to the public network via 2-wire analogue leased lines, typically for:
- Business and Carrier Grade Telephony: Ensuring that analogue voice equipment stays compatible with leased line infrastructure, maintaining consistent voice quality and reliability.
- Legacy Device Integration: Enables continued use and modernization of analogue devices within newer telecommunications architectures by providing clear interface and compliance rules.
- Testing and Compliance: Network operators and manufacturers use the defined test methods to certify and document conformance prior to deployment, minimizing interoperability issues.
Related Standards
For optimal results and broader compliance in telecommunications networks, consider these related standards and recommendations:
- EN 300 448: Defines connection characteristics and network interface for ordinary-quality 2-wire analogue leased lines (A2O).
- EN 300 449: Specifies connection requirements for special-quality 2-wire analogue leased lines (A2S).
- ISO/IEC 8877: Standard for ISDN basic access interface connectors and assignments.
- ITU-T Recommendations (M.1020, M.1040, P.56, P.64): Provide international guidance on leased circuit characteristics and objective measurement of speech signals.
- CENELEC EN 60950: Safety standard for information technology equipment, covering areas not detailed in SIST EN 300 450.
- ETSI TBR 15: Attachment requirements for business telecommunications terminal equipment in similar environments.
By adhering to the specifications in SIST EN 300 450 V1.2.1:2004 and its related documents, network providers and manufacturers can ensure robust, safe, and interoperable analogue voice services throughout Europe.
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Frequently Asked Questions
SIST EN 300 450 V1.2.1:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface". This standard covers: Specification of the terminal equipment side of the interface and test procedures for compliance. Revision of ETS 300 450 to improve the safety related text following a liaison received from TC Safety.
Specification of the terminal equipment side of the interface and test procedures for compliance. Revision of ETS 300 450 to improve the safety related text following a liaison received from TC Safety.
SIST EN 300 450 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 300 450 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 300 450 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.HUPLQDOVNHRSUHPHAccess and Terminals (AT); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 450 Version 1.2.1SIST EN 300 450 V1.2.1:2004en01-oktober-2004SIST EN 300 450 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300450V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);TerminalequipmentinterfaceSIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)2ReferenceREN/AT-010003KeywordsONP,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 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)3ContentsIntellectualPropertyRights.4Foreword.4Introduction.51Scope.62References.63Definitionsandabbreviations.63.1Definitions.63.2Abbreviations.74Requirements.74.1Physicalcharacteristics.74.2Electricalcharacteristics.84.2.1Returnloss.84.2.2Longitudinalconversionloss.84.2.3Transmissionsignals.94.2.3.1Equipmentwithanacousticinput.94.2.3.1.1SendingLoudnessRating(SLR).94.2.3.2Equipmentwithinternallygeneratedelectricalsignals.104.2.3.2.1Maximummeanpower.104.2.3.2.2Maximuminstantaneouspower(peakvoltage).104.2.3.2.3Maximumpowerina10Hzbandwidth.104.2.3.3Equipmentwithanelectricalinput.114.2.4Maximumsendingpowerabove4,3kHz.114.2.5Powerfeeding.124.3Safety.124.4Overvoltage.124.5ElectroMagneticCompatibility(EMC).13AnnexA(normative):Testmethods.14A.1General.14A.1.1Equipmentconnection.14A.1.2Referenceimpedance.14A.1.3Non-reactivetermination.15A.2Testmethods.15A.2.1Returnloss.15A.2.2Longitudinalconversionloss.16A.2.3SendingLoudnessRating.17A.2.4Maximummeanpower.18A.2.5Maximuminstantaneouspower(peakvoltage).19A.2.6Maximumpowerina10Hzbandwidth.19A.2.7Maximumsendingpowerabove4,3kHz.20A.2.8Powerfeeding.21AnnexB(informative):Bibliography.22History.23SIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)4IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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)toprovidestandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300448:"AccessandTerminals(AT);Ordinaryqualityvoicebandwidth2-wireanalogueleasedline(A2O);Connectioncharacteristicsandnetworkinterfacepresentation".-EN300449:"AccessandTerminals(AT);Specialqualityvoicebandwidth2-wireanalogueleasedline(A2S);Connectioncharacteristicsandnetworkinterfacepresentation".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)5IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlineswithinandbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.Twocategories(voluntaryandregulatory)ofstandardwereusedfortheinterfacesofterminalequipmentdesignedforconnectiontotheONPleasedlines.TechnicalBasisforRegulations(TBRs)gavetheearlieressentialrequirementsundertheDirective91/263/EEC,laterreplacedby98/13/EC,forattachmenttotheleasedlines,whereasothervoluntarystandards(ETSsorENs)gavethefulltechnicalspecificationsfortheseinterfaces.Thepresentdocument,whichisbasedonanearlierETS,belongstothesecondcategory.TherequirementsofTBR15areasubsetofthepresentdocument.Thepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationsM.1020andM.1040wereusedasthebasisfortheleasedlinestandardstowhichthisterminalequipmentinterfacerelates.SIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)andcorrespondingtestprinciplesforaterminalequipmentinterfaceforconnectiontothenetworkterminationpointsofOpenNetworkProvision(ONP)ordinaryqualityorspecialqualityvoicebandwidth2-wireanalogueleasedlinesdefinedbyEN300448[4]andEN300449[5].ThepresentdocumentiswrittenonlytoensurethattheinterfaceoftheterminalequipmentiscompatiblewiththeONPordinaryqualityorspecialqualityvoicebandwidth2-wireanalogueleasedline.Itisapplicabletoallinterfacesdesignedforconnectiontotheseleasedlines,howeverinthecasesofapparatusthatcarriesaparticularservice,ofcomplexapparatusandofapparatusinprivatenetworks,otherrequirementsmayapplyinadditiontothepresentdocument.CustomerpremiseswiringandinstallationbetweentheterminalequipmentandtheNTPareoutsidethescopeofthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ISO/IEC8877(1992):"Informationtechnology.Telecommunicationsandinformationexchangebetweensystems.InterfaceconnectorandcontactassignmentsforISDNBasicAccessInterfacelocatedatreferencepointsSandT".[2]ITU-TRecommendationP.56(1993):"Objectivemeasurementofactivespeechlevel".[3]ITU-TRecommendationP.64(1999):"Determinationofsensitivity/frequencycharacteristicsoflocaltelephonesystems".[4]ETSIEN300448:"AccessandTerminals(AT);Ordinaryqualityvoicebandwidth2-wireanalogueleasedline(A2O);Connectioncharacteristicsandnetworkinterfacepresentation".[5]ETSIEN300449:"AccessandTerminals(AT);Specialqualityvoicebandwidth2-wireanalogueleasedline(A2S);Connectioncharacteristicsandnetworkinterfacepresentation".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkSIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)7referenceimpedanceZR:compleximpedancemadeupofaresistanceof270Ωinserieswithaparallelcombinationof750Ωand150nF.SeealsoclauseA.1.2terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationnetwork;i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationnetwork,inordertosend,process,orreceiveinformation.voicebandwidth:bandoffrequenciesovertherange300Hzto3400Hz3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:aReturnlossindBdcdirectcurrentDTMFDualToneMulti-FrequencyEMCElectroMagneticCompatibilityNTPNetworkTerminationPointONPOpenNetworkProvisionpmSoundpressureatthemouthreferencepoint(usedinthecalculationofSLR)rmsrootmeansquareSLRSendingLoudnessRatingmjSSendingsensitivity(usedinthecalculationofSLR)mjnSSendingsensitivityatfrequencyfn(usedinthecalculationofSLR)snWSendingweightingfactor(usedinthecalculationofSLR)ZRReferenceimpedanceZTTerminationimpedance4Requirements4.1PhysicalcharacteristicsRequirement:Theterminalequipmentshallprovideoneormoreofthefollowingconnectionmethods:a)an8-contactplugofthetypespecifiedinISO/IEC8877[1]withcontactassignmentsasspecifiedintable1;b)asetofconnectioncontacts(e.g.aninsulationdisplacementconnectororscrewterminalblock)towhichsolidconductorswithdiametersintherange0,4to0,6mmmaybeconnected;c)awiringarrangementconnectedbyanymeanstotheterminalequipment,withunterminatedsolidwireconductorswithdiametersintherange0,4to0,6mmatthedistantendfromtheterminalequipment.Wherea)andc)areprovided,thesemaybedetachablebytheusersuchthatonlyoneisconnectedtotheterminalequipmentatanyonetime.NOTE:Thenormalpresentationoftheleasedlineisbymeansofasocket.SIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)8Table1:ContactassignmentsContactnumberterminalequipment1Unused2Unused3Unused4&5Pair6Unused7Unused8UnusedTest:Thereshallbeavisualinspectionthatoneormoreoftheconnectionmethodsareprovided.ThecontactassignmentsandconnectionmethodsaretestedindirectlythroughthetestsinannexA.4.2ElectricalcharacteristicsTherequirementsofclause4.2applyonlyintheintendedoperatingstateoftheterminalequipment.4.2.1ReturnlossRequirement:Thereturnlossoftheimpedancepresentedbytheterminalequipmentinterfacewithrespecttothereferenceimpedance,inthefrequencyrange200Hzto4000Hz,shallbegreaterthanorequalto8dBthroughouttherangewhentestedusingastimulussignalatavoltageequivalenttothatofasignalpowerof-9dBmat1020Hz.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.2.2LongitudinalconversionlossRequirement:Thelongitudinalconversionlossoftheterminalequipmentinterfaceshallbegreaterthanorequaltothevaluesgivenintable2andfigure1.NOTE:Thelongitudinalconversionlossspecifiestheunwantedtransversesignaldetectedbytheterminalequipmentwhenalongitudinalsignalisappliedequallytotheterminalsoftheinterface.Certainnetworksmayhavehighlongitudinalsignallevels(e.g.65Vrootmeansquare(rms));inthiscase,ahigherlongitudinalconversionlossmaybenecessarytoensureadequateoperationoftheterminalequipment.Table2:Longitudinalconversionloss,minimumvaluesFrequencyrangeMinimumvalue300Hzto600Hz40dB600Hzto3400Hz46dBSIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)960010003400FrequencyHz1020304050300LongitudinalconversionlossdB4640020005000500Figure1:Longitudinalconversionloss,minimumvaluesTest:ThetestshallbeconductedaccordingtoclauseA.2.2.4.2.3TransmissionsignalsThesourceandnatureoftheoutputsignalfromtheterminalequipmentinterfacecanbeclassifiedinseveraldifferentwaysthusdividingtheterminalequipmentsintoseveralnon-exclusivecategories.Onetypeofterminalequipmentmaythereforeneedtobetreatedasamemberofmorethanoneofthecategories.Forthepurposesofthepresentdocument,thegeneralcategoriesrequiringidentificationaredefinedasfollows:a)anyterminalequipmentwheretheoutputsignalisderivedinrealtimefromanintegralacousticinterface.Seeclause4.2.3.1;b)anyterminalequipmentwheretheoutputsignalisgeneratedelectricallywithintheterminalequipment.Seeclause4.2.3.2;c)anythroughconnectingterminalequipmentwheretheoutputsignalisderivedfromanotherelectricalinterface.Seeclause4.2.3.3.NOTE:Terminalequipmentsmaybelongtomorethanonecategory.Atelephonemaybeinbothcategorya)fortelephonyandcategoryb)forthegenerationofDualToneMulti-Frequency(DTMF)tones.Afunctionforgeneratingsyntheticorrecordedspeechormusic,suchasisfoundinansweringmachinesorvoicemail,isincludedincategoryb).4.2.3.1Equipmentwithanacousticinput4.2.3.1.1SendingLoudnessRating(SLR)Requirement:TheminimumSLRoftheterminalequipment,whenterminatedwiththereferenceimpedanceZR,shallbegreaterthanorequalto-5dB.NOTE:TheminimumSLRvalueof-5dBreferstotheactualmeasuredvalueratherthanthenominalvalue,i.e.thereisnotoleranceonthespecifiedvalue,andhasbeenspecifiedtoensurenoharmtothenetwork.Itisrecommendedthatfornormaloperation,theSLRshouldbegreaterthanorequalto-2dB.Test:ThetestshallbeconductedaccordingtoclauseA.2.3.SIST EN 300 450 V1.2.1:2004
ETSIETSIEN300450V1.2.1(2001-07)104.2.3.2Equipmentwithinternallygeneratedelectricalsignals4.2.3.2.1MaximummeanpowerRequirement:Themeanpowerlevelinthefrequencyrange200Hzto3800Hzinanyone-minuteperiodshallbenotgreaterthan-9dBmwhentheterminalequipmentinterfaceisterminatedwiththereferenceimpedanceZR
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