SIST EN 300 012-1 V1.2.2:2003
(Main)Integrated Services Digital Network (ISDN); Basic User-Network Interface (UNI); Part 1: Layer 1 specification
General Information
- Abstract
Maintenance work : correction of safety provisions
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
Overview
SIST EN 300 012-1 V1.2.2:2003 specifies the Layer 1 (physical layer) requirements for the Basic User-Network Interface (UNI) of the Integrated Services Digital Network (ISDN). Developed by the Slovenski inštitut za standardizacijo (SIST) and harmonized with European and international standards, this document provides guidelines on the physical, electrical, and functional characteristics for ISDN UNI implementation in customer premises equipment. The purpose is to ensure interoperability, portability, and reliable information exchange at the basic rate interface across Europe, supporting higher layer protocols and consistent connectivity. While the standard addresses key technical aspects, it specifically excludes safety requirements and equipment overvoltage protection.
Key Topics
- Physical Layer Specifications: Defines the physical and electrical interface parameters for ISDN Basic Access at reference points S, T, and S/T, in line with ITU-T recommendations.
- Interface Types: Addresses interface IA and IB for use with customer-premises ISDN equipment, ensuring compatibility at the UNI.
- Configuration Support: Covers point-to-point and point-to-multipoint wiring configurations, supporting a range of deployment scenarios in business and residential environments.
- Functional Characteristics: Details aspects such as bit and octet timing, frame structures, activation/deactivation procedures, and interface power feeding requirements.
- Maintenance Updates: This edition includes corrections to safety provisions, reflecting ongoing maintenance work and editorial improvements related to safety-related clauses.
- Interworking & Portability: Provides essential definitions, operational modes, and state diagrams to promote interworking between equipment from different manufacturers and support higher level ISDN protocols.
Applications
ISDN basic rate interfaces (BRI), compliant with this standard, enable a variety of telecommunications solutions in both business and residential settings. Practical applications include:
- Voice and Data Integration: Facilitates simultaneous voice and data services over a single ISDN line, supporting unified communication needs for enterprises and homes.
- Business Connectivity: Used in PBX systems and for linking office networks to public ISDN infrastructure, ensuring high quality digital communication.
- Terminal Equipment Interoperability: Ensures that telephones, fax machines, network termination devices (NT1/NT2), and other ISDN terminals from different vendors function reliably together.
- Testing and Commissioning: Provides a framework for conformance testing and troubleshooting, enabling equipment providers and network operators to verify correct implementation of ISDN Layer 1 features.
This standard is crucial for telecommunications equipment manufacturers, system integrators, and service providers aiming to deliver standardized ISDN solutions with assured interoperability and performance.
Related Standards
For robust and complete ISDN deployments, SIST EN 300 012-1 V1.2.2:2003 references and interoperates with several related standards, including:
- ITU-T Recommendation I.411 – ISDN user-network interfaces; reference configurations
- ITU-T Recommendation I.430 – Basic user-network interface; physical layer specifications
- EN 300 012 series – More detailed specifications and conformance testing for ISDN UNI
- EN 28877 / ISO/IEC 8877 – Connector and interface assignment for ISDN access points
- EN 60603-7 – Specifications for connectors used in ISDN environments
- ITU-T Recommendation Q.921 – Data link layer specification for the ISDN UNI
Staying aligned with these standards ensures compatibility, interoperability, and adherence to regulatory and safety requirements for ISDN services and devices across Europe.
Keywords: ISDN, Basic User-Network Interface, Layer 1, UNI, physical layer, telecommunications, interoperability, standardized interface, SIST, ETSI, conformant equipment, wiring configuration, BRI, European standard, electrical characteristics, reference points S/T, network termination, customer premises equipment.
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Frequently Asked Questions
SIST EN 300 012-1 V1.2.2:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Basic User-Network Interface (UNI); Part 1: Layer 1 specification". This standard covers: Maintenance work : correction of safety provisions
Maintenance work : correction of safety provisions
SIST EN 300 012-1 V1.2.2:2003 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 012-1 V1.2.2:2003 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.Digitalno omrežje z integriranimi storitvami (ISDN) – Osnovni vmesnik uporabnik-omrežje (UNI) – 1. del: Specifikacija prve plastiIntegrated Services Digital Network (ISDN); Basic User-Network Interface (UNI); Part 1: Layer 1 specification33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 012-1 Version 1.2.2SIST EN 300 012-1 V1.2.2:2003en01-december-2003SIST EN 300 012-1 V1.2.2:2003SLOVENSKI
STANDARD
ETSIEN300012-1V1.2.2(2000-05)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);BasicUser-NetworkInterface(UNI);Part1:Layer1specificationSIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)2ReferenceREN/TM-06017-3Keywordsbasic,B-ISDN,ISDN,layer1,rate,transmission,UNIETSI650RoutedesLuciolesF-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 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)3ContentsIntellectualPropertyRights.8Foreword.81Scope.92References.93Definitions,symbolsandabbreviations.103.1Definitions.103.1.1Generaldefinitions.103.1.2Definitionofservices.113.1.3Primitivesbetweenlayer1andotherentities.113.1.4Modesofoperation.113.1.5Definitionofstates.113.1.5.1TEstates.113.1.5.2NTStates.123.2Symbols.123.3Abbreviations.124Primitivesassociatedwithlayer1.135Wiringconfigurationsandlocationofinterfacepoints.135.1General.135.1.1Point-to-pointconfiguration.135.1.2Point-to-multipointconfiguration.135.1.3Locationoftheinterfaces.135.2Supportofwiringconfigurations.145.2.1Wiringpolarityintegrity.145.2.2NTandTEassociatedwiring.146Functionalcharacteristics.156.1Interfacefunctions.156.1.1B-channel.156.1.2Bittiming.156.1.3Octettiming.156.1.4Framealignment.156.1.5D-channel.156.1.6D-channelaccessprocedure.156.1.7Powerfeeding.156.1.8Deactivation.156.1.9Activation.156.2Interchangecircuits.166.3Connected/disconnectedindication.166.3.1TEspoweredacrosstheinterface.166.3.2TEsnotpoweredacrosstheinterface.166.3.3Indicationofconnectionstatus.166.4Framestructure.176.4.1Bitrate.176.4.2Binaryorganizationoftheframe.176.4.2.1TEtoNT.186.4.2.2NTtoTE.186.4.2.3Relativebitpositions.186.5Linecode.196.6Timingconsiderations.197Interfaceprocedures.197.1D-channelaccessprocedure.197.1.1Interframe(layer2)timefill.197.1.2D-echochannel.20SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)47.1.3D-channelmonitoring.207.1.4Prioritymechanism.207.1.5Collisiondetection.207.2Activation/deactivation.207.2.1Activateprimitives.207.2.2Deactivateprimitives.217.2.3Managementprimitives.217.2.4Validprimitivesequences.217.3Signals.237.4Activation/deactivationprocedureforTEs.237.4.1GeneralTEprocedures.237.4.2Specificationoftheprocedure.237.5Activation/deactivationforNTs.247.5.1Non-activating/non-deactivatingNTs.247.6Timervalues.247.7Activationtimes.247.7.1TEactivationtimes.247.7.2NTactivationtimes.287.8Deactivationtimes.298Framealignmentprocedures.298.1FramealignmentprocedureinthedirectionNTtoTE.298.1.1Lossofframealignment.298.1.2Framealignment.298.2FramealignmentinthedirectionTEtoNT.298.2.1Lossofframealignment.298.2.2Framealignment.308.3Multiframing.308.4IdlechannelcodeontheBchannels.309Electricalcharacteristics.309.1Bitrate.309.1.1Nominalrate.309.1.2Tolerance.309.2Jitterandbit-phaserelationshipbetweenTEinputandoutput.309.2.1Testconfigurations.309.2.2Timingextractionjitter.319.2.3Totalphasedeviationinputtooutput.329.3NTjittercharacteristics.349.4Terminationoftheline.349.5Transmitteroutputcharacteristics.349.5.1Transmitteroutputimpedance.349.5.1.1NTtransmitteroutputimpedance.349.5.1.2TEtransmitteroutputimpedance.359.5.2Testloadimpedance.359.5.3Pulseshapeandamplitude(binaryZERO).359.5.3.1Pulseshape.359.5.3.2Nominalpulseamplitude.369.5.4Pulseunbalance.369.5.4.1Pulseamplitudewhentransmittingahighdensitypattern.369.5.4.2Pulseunbalanceofanisolatedcoupleofpulses.379.5.5Voltageonothertestloads(TEonly).379.5.5.1400Ωload.379.5.5.25,6Ωload.379.5.6Unbalanceaboutearth.379.5.6.1Longitudinalconversionloss.379.5.6.2Outputsignalbalance.399.6Receiverinputcharacteristics.409.6.1Receiverinputimpedance.409.6.1.1TEreceiverinputimpedance.409.6.1.2NTreceiverinputimpedance.40SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)59.6.2Receiversensitivity-Noiseanddistortionimmunity.409.6.2.1TEs.409.6.2.2NTsforshortpassivebus(fixedtiming).419.6.2.3NTsforbothpoint-to-pointandshortpassivebusconfigurations(adaptivetiming).429.6.2.4NTsforextendedpassivebuswiringconfigurations.429.6.2.5NTsforpoint-to-pointconfigurationsonly.429.6.3NTreceiverinputdelaycharacteristics.439.6.3.1NTforshortpassivebus.439.6.3.2NTforbothpoint-to-pointandpassivebus.439.6.3.3NTforextendedpassivebus.439.6.3.4NTforpoint-to-pointonly.439.6.4Unbalanceaboutearth.439.7Isolationfromexternalvoltages.449.8Interconnectingmediacharacteristics.449.9StandardISDNbasicaccessTEcord.4410PowerFeeding.4410.1Referenceconfiguration.4410.1.1Functionsspecifiedattheaccessleads.4510.1.2Provisionofpowersourcesandsinks.4610.2PoweravailablefromNT.4610.2.1Powersource1normalandrestrictedmode.4610.2.2MinimumvoltageatNTfrompowersource1.4610.2.2.1Normalpowerconditions.4610.2.2.2Restrictedpowerconditions.4710.2.3Minimumvoltageofpowersource2.4710.3PoweravailableataTE.4710.3.1Powersource1-phantommode.4710.3.1.1Normalpowerconditions.4710.3.1.2Restrictedpowerconditions.4710.3.2Powersource2-optionalthirdpair.4710.3.2.1Normalpowerconditions.4710.3.2.2Restrictedpowerconditions.4710.4Powersource1consumption.4710.4.1Normalpowerconditions.4710.4.2Restrictedpowerconditions.4810.4.2.1PowerAvailabletoaTE"designated"forrestrictedpoweroperation.4810.4.2.2Poweravailableto"non-designated"TEs.4810.5Galvanicisolation.4810.6Currenttransient.4910.6.1Current/timelimitationsforTEs.4910.6.2TEdesignedtominimizepowerdisturbance.5010.6.2.1Optimizedcurrent/timemask.5110.6.2.2Alternativecurrent/timemaskforoptimizedTEs.5210.6.3Powersourceswitch-over.5310.6.3.1Powersourceswitch-overtime.5310.6.3.2Restrictedmodepowersourcerequirementsunderoverloadconditions.5310.6.4OtherTErequirements.5310.6.4.1MinimumTEstart-upcurrent.5310.6.4.2Protectionagainstshortterminterruptions.5410.6.4.3Behaviourattheswitch-over.5410.6.5Otherpowersourcerequirements.5410.6.5.1Powersource1restricted.5410.6.5.2Powersource1normal.5410.6.5.3Requirementsfortype(a)sources.5510.6.5.4Requirementsforbothtypesofsources.5510.6.5.4.1Switch-onsurgecapability.5510.6.5.4.2TEconnectionsurgecapability.5510.7Currentunbalance.5510.7.1Directcurrentunbalance.5510.7.1.1dcunbalanceofpowersource1.55SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)610.7.1.2dcunbalanceofpowersink1.5610.7.1.3Differentialresistanceinapairoftheinstallationwiring.5610.7.2Currentunbalanceinapair.5610.8AdditionalrequirementsforanAPS.5710.8.1PoweravailableforanAPS.5710.8.2APSswitch-ontime.5710.8.3APSswitch-offtime.5710.8.4APSpowerconsumptionwhenoff.5810.8.5DynamicbehaviourofanAPS.5810.9AdditionalrequirementsforNT1restrictedmodesourceforcompatibilitywithanAPS.5810.9.1Powersource1restrictedmodeback-off.5810.9.2Powersource1restrictedmodepowerup.5810.9.3NT1powerconsumptionfromAPSnormalmode.5811Interfaceconnectorcontact.58AnnexA(informative):Wiringconfigurationsandroundtripdelayconsiderationsusedasabasisforelectricalcharacteristics.60A.1Introduction.60A.2Wiringconfigurations.60A.2.1Point-to-multipoint.60A.2.1.1Shortpassivebus(FigureA.1).60A.2.1.2Extendedpassivebus(FigureA.2).61A.2.2Point-to-point(FigureA.3).61AnnexB(normative):Testconfigurations.63AnnexC(normative):TestloopbacksdefinedforthebasicUNI.65C.1Introduction.65C.2Loopbackmechanismdefinitions.65C.3Testloopbackreferenceconfiguration.66C.4Testloopbackcharacteristics.67AnnexD(normative):Additionalrequirementsapplicabletothe(explicit)Sreferencepoint.68D.1Introduction.68D.2References.68D.3Definitions.68D.3.1PrivateNetworkTermination(PNT).68D.3.2TerminalEquipment(TE).68D.4Conformance.68D.5Requirements.69D.6Provisionofpower.69AnnexE(informative):SDLrepresentationofapossibleimplementationoftheD-channelaccess.70AnnexF(informative):SDLrepresentationofactivation/deactivationproceduresforTEsandNTs.72F.1SDLrepresentationofactivation/deactivationproceduresforTEs.72F.2SDLrepresentationofactivation/deactivationproceduresforNTs.72SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)7AnnexG(informative):Multiframingmechanism.80G.1Multiframing.80G.1.1Generalmechanism.80G.1.2Q-bitpositionidentificationalgorithm.80G.1.3TEmultiframeidentification.81G.2S-channelstructuringalgorithm.81History.83SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)8IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeTransmissionandMultiplexing(TM).ThepresentdocumentconcernsthebasicUserNetworkInterface(UNI)fortheIntegratedServicesDigitalNetwork(ISDN)andconsistsof7partsasfollows:Part1:"Layer1specification";Part2:"ImplementationConformanceStatement(ICS)andImplementationeXtraInformationforTesting(IXIT)specificationforinterfaceIA";Part3:"ImplementationConformanceStatement(ICS)andImplementationeXtraInformationforTesting(IXIT)specificationforinterfaceIB";Part4:"ConformancetestspecificationforinterfaceIA";Part5:"ConformancetestspecificationforinterfaceIB";Part6:"AbstractTestSuite(ATS)specificationforinterfaceIA";Part7:"AbstractTestSuite(ATS)specificationforinterfaceIB";andisbasedonITU-TRecommendationI.430[10].ThepresentdocumentincludeseditorialimprovementsofSafetyrelatedclauses.NationaltranspositiondatesDateoflatestannouncementofthisEN(doa):31August2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2001DateofwithdrawalofanyconflictingNationalStandard(dow):28February2001SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)91ScopeThepresentdocumentspecifiesrequirementsfortheISDNbasicrateUNIincludingthephysical,electricalandfunctionalcharacteristicsandtheinformationexchangewithhigherlayers.ThisensuresthatinterfaceimplementationsinanISDNequipmentforusewithISDNbasicaccessisportablewithinEuropewithregardtolayer1interfaceaspectsandthatinterworkingwithhigherlayerprotocolsforISDNissupported.ThepresentdocumentisapplicabletoequipmenthavinginterfaceIAorIBfortheconnectiontotheISDNbasicaccessintendedtobeinstalledoncustomerpremisesaccordingtoITU-TRecommendationI.411[9],thepresentdocumentisforapplicationtointerfacesatreferencepointsS,TandS/T(coincidentSandT)oftheISDNreferenceconfiguration.ForthecasewherethepresentdocumentisappliedtotheTandtheS/Treferencepoint,themainbodyofthepart1andtheparts6and7arenormative.ForthecasewherethepresentdocumentisappliedtotheSreferencepoint,annexAtothispart1isalsonormative.Thepresentdocumentdoesnotspecify:-safetyrequirements;-interfaceorequipmentovervoltageprotectionrequirements;-immunityrequirementsagainstelectromagneticinterference;-emissionlimitationrequirements.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ITU-TRecommendationG.117(1996):"Transmissionaspectsofunbalanceaboutearth".[2]ITU-TRecommendationI.412(1988):"ISDNuser-networkinterfaces;interfacestructuresandaccesscapabilities".[3]CCITTRecommendationX.211(1988):"PhysicalservicedefinitionofopensystemsinterconnectionforCCITTapplications".[4]EN28877(1993):"Informationtechnology;Telecommunicationsandinformationexchangebetweensystems;InterfaceconnectorandcontactassignmentforISDNBasicAccessInterfacelocatedatreferencepointsSandT(ISO/IEC8877:1992)".[5]EN60603-7(1993):"Connectorsforfrequenciesbelow3MHzforusewithprintedboards;Part7:Detailspecificationforconnectors,8-way,includingfixedandfreeconnectorswithcommonmatingfeatures;(IEC603-7:1990)(S)".[6]ENV41004:"ReferenceConfigurationforConnectivityRelationsofPrivateTelecommunicationNetworkExchanges".[7]ETSIETS300047-3(1992):"IntegratedServicesDigitalNetwork(ISDN);Basicaccess-safetyandprotection;Part3:InterfaceIA-protection".SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)10[8]ISO/IEC9646-1(1994):"Informationtechnology;OpenSystemsInterconnection;ConformanceTestingMethodologyandFramework;Part1:Generalconcepts".[9]ITU-TRecommendationI.411(1993):"ISDNuser-networkinterfaces;referenceconfigurations".[10]ITU-TRecommendationI.430(1995):"Basicuser-networkinterface;layer1specification".[11]ITU-TRecommendationQ.921(1993):"ISDNuser-networkinterface-datalinklayerspecification".[12]ITU-TRecommendationQ.931(03/93):"ISDNuser-networkinterfacelayer3specificationforbasiccallcontrol".[13]EN50081:"Electromagneticcompatibility;Genericemissionstandard".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingdefinitionsapply:3.1.1Generaldefinitionsbasicaccess:user-networkaccessarrangementthatcorrespondstotheinterfacestructurecomposedoftwoB-channelsandoneD-channel.ThebitrateoftheD-channelforthistypeofaccessis16kbit/s.ImplementationConformanceStatement(ICS):seeISO/IEC9646-1[8],subclause3.4.6.IntegratedServicesDigitalNetwork(ISDN):integratedservicesnetworkthatprovidesdigitalconnectionsbetweenUNIs.interface:thepresentdocumentdefinesthelayer1characteristicsoftheUNItobeappliedattheSorTreferencepointsforthebasicinterfacestructuredefinedinITU-TRecommendationI.412[2].ThereferenceconfigurationfortheinterfaceisdefinedinITU-TRecommendationI.411[9]andisreproducedinfigure1.ReferencepointFunctionalgroupTransmissionLineNT1TSSRa)b)NT2TE1TE2TAFigure1:DefinitionofinterfacepointsaccordingtotheISDNreferenceconfigurationNetworkTermination(NT):thetermNTisusedtoindicatenetworkterminatinglayer1aspectsofNT1andNT2functionalgroupsunlessotherwiseindicated.However,insubclauses3.1.5and7.2thetermNTisusedtoindicatethelayer1networksideofthebasicaccessinterface.SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)11TerminalEquipment(TE):thetermTEisusedtoindicateterminalterminatinglayer1aspectsofTE1,TAandNT2functionalgroups,unlessotherwiseindicated.However,insubclauses3.1.5and7.2,thetermTEisusedtoindicatethelayer1terminalsideofthebasicaccessinterface.3.1.2Definitionofservicesservicesrequiredfromthephysicalmedium:layer1ofthisinterfacerequiresabalancedmetallictransmissionmedium,foreachdirectionoftransmission,capableofsupporting192kbit/s.servicesprovidedtolayer2:layer1providesthefollowingservicestolayer2andthemanagemententity.transmissioncapability:layer1providesthetransmissioncapability,bymeansofappropriatelyencodedbitstreams,fortheB-andD-channelsandtherelatedtimingandsynchronizationfunctions.activation/deactivation:layer1providesthesignallingcapabilityandthenecessaryprocedurestoenablecustomerTEsand/orNTstobedeactivatedwhenrequiredandreactivatedwhenrequired.Theactivationanddeactivationproceduresaredefinedinsubclause7.2.D-channelaccess:layer1providesthesignallingcapabilityandthenecessaryprocedurestoallowTEstogainaccesstothecommonresourceoftheD-channelinanorderlyfashionwhilemeetingtheperformancerequirementsoftheD-channelsignallingsystem.TheseD-channelaccesscontrolproceduresaredefinedinsubclause7.1.maintenance:layer1providesthesignallingcapability,proceduresandnecessaryfunctionsatlayer1toenablemaintenancefunctionstobeperformed.statusindication:layer1providesanindicationtothehigherlayersofthestatusoflayer1.3.1.3Primitivesbetweenlayer1andotherentitiesPrimitivesrepresent,inanabstractway,thelogicalexchangeofinformationandcontrolbetweenlayer1andotherentities.Theyneitherspecifynorconstraintheimplementationofentitiesorinterfaces.3.1.4ModesofoperationBothpoint-to-pointandpoint-to-multipointmodesofoperation,asdescribedbelow,areintendedtobeaccommodatedbythelayer1characteristicsoftheUNI.Inthepresentdocument,themodesofoperationapplyonlytothelayer1proceduralcharacteristicsoftheinterfaceanddonotimplyanyconstraintsonmodesofoperationathigherlayers.Point-to-pointoperation:thismodeofoperationatlayer1impliesthatonlyonesource(transmitter)andonesink(receiver)areactiveatanyonetimeineachdirectionoftransmissionatanSorTreferencepoint.(Suchoperationisindependentofthenumberofinterfacesthatmaybeprovidedonaparticularwiringconfigurations-seeclause5).Point-to-multipointoperation:thismodeofoperationatlayer1allowsmorethanoneTE(sourceandsinkpair)tobesimultaneouslyactiveatanSorTreferencepoint.(Themultipointmodeofoperationmaybeaccommodated,asdiscussedinclause5,withpoint-to-pointorpoint-to-multipointwiringconfigurations).3.1.5Definitionofstates3.1.5.1TEstatesStateF1(INACTIVE):inthisinactive(powered-off)state,theTEisnottransmittingandcannotdetectthepresenceofanyinputsignals.InthecaseoflocallypoweredTEs,whichcannotdetecttheappearance/disappearanceofpowersource1or2,thisstateisenteredwhenlocalpowerisnotpresent.ForTEsthatcandetectpowersource1orpowersource2,thisstateisenteredwheneverlossofpower(requiredtosupportallTEIfunctions)isdetected,orwhentheabsenceofpowerfromsource1or2,whicheverpowersourceisusedfordeterminingtheconnectionstatus,isdetected.StateF2(SENSING):thisstateisenteredaftertheTEhasbeenpoweredonbuthasnotdeterminedthetypeofsignal(ifany)thattheTEisreceiving.Wheninthisstate,aTEmaygotoalow-powerconsumptionmodeasspecifiedinsubclause6.1.8.SIST EN 300 012-1 V1.2.2:2003
ETSIETSIEN300012-1V1.2.2(2000-05)12StateF3(DEACTIVATED):thisisthedeactivatedstateofthephysicalprotocol.NeithertheNTnortheTEistransmitting.Wheninthisstate,aTEmaygotoalow-powerconsumptionmodeasspecifiedinsubclause6.1.8.StateF4(AWAITINGSignal):whentheTEisrequestedtoinitiateactivationbymeansofaPH-ACTIVATEREQUESTprimitive,ittransmitsasignal(INFO1)andwaitsforaresponse
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