SIST EN 300 012-1 V1.2.2:2003

• Abstract:

  Maintenance work : correction of safety provisions

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 012-1 V1.2.2 (2000-05) - Integrated Services Digital Network (ISDN); Basic User-Network Interface (UNI); Part 1: Layer 1 specification

SIST EN 300 012-1 V1.2.2:2003 is the Slovenian adoption of ETSI EN 300 012-1 Version 1.2.2 for the Integrated Services Digital Network (ISDN) Basic User-Network Interface (UNI). It specifies the layer 1 physical, electrical and procedural behavior of the basic ISDN access so equipment can interoperate at the S, T and S/T reference points on customer premises.

What does SIST EN 300 012-1 V1.2.2:2003 specify?

SIST EN 300 012-1 V1.2.2:2003 specifies the basic rate ISDN UNI for interface IA or IB equipment, including physical, electrical and functional characteristics and the information exchange with higher layers. In practice, this is the document you use when you need terminal equipment and network termination equipment to connect and behave consistently on an ISDN basic access line.

The scope applies to customer-premises installations and covers point-to-point and point-to-multipoint operation. It excludes safety requirements, interface or equipment overvoltage protection, immunity to electromagnetic interference, and emission limitation requirements.

The body of the standard is organized into clauses on scope, references, definitions, primitives, wiring configurations, functional characteristics, interface procedures, frame alignment, electrical characteristics, power feeding and connector contacts.

Annex	What it covers
Annex A	Wiring configurations and roundtrip delay considerations used as a basis for electrical characteristics
Annex B	Test configurations
Annex C	Test loopbacks defined for the basic UNI
Annex D	Additional requirements applicable to the explicit S reference point
Annex E	SDL representation of a possible implementation of D-channel access
Annex F	SDL representation of activation/deactivation procedures for TEs and NTs
Annex G	Multiframing mechanism

What are the key requirements of SIST EN 300 012-1 V1.2.2:2003?

SIST EN 300 012-1 V1.2.2:2003 sets the layer 1 behavior that makes basic ISDN access work predictably: channel structure, timing, access control, framing, electrical limits and power feeding. For implementers, the important point is that the document is not just about wiring - it also defines how devices synchronize, share the D-channel, enter low-power states and recover.

Channel structure and timing

The standard defines two B-channels at 64 kbit/s each and one D-channel at 16 kbit/s, with a nominal interface bitrate of 192 kbit/s. It also defines bit timing, octet timing and frame alignment so that both ends recover the same time base from the line. In practice, this is what lets voice, data and signalling share one access line without losing synchronization.

D-channel access and collision handling

Clause 7 defines an orderly D-channel access procedure using the D-echo channel, monitoring, priority classes and collision detection. The TE must watch the echoed bits and stop transmitting if the echo does not match. That matters because multiple terminals can share the same access bus without corrupting signalling traffic.

Activation, deactivation and signal states

The standard uses INFO0, INFO1, INFO2, INFO3 and INFO4 signals and state machines for TE and NT activation and deactivation. It also defines layer 1 primitives such as PH-ACTIVATE REQUEST, PH-DEACTIVATE INDICATION and MPH-INFORMATION INDICATION. In practice, this gives equipment a common way to wake up, enter low power, report connection status and re-establish service after loss of framing or power.

Framing and line coding

Clause 8 defines frame alignment procedures, including the use of line code violations and auxiliary framing bits, and clause 6.5 specifies pseudo-ternary coding. The frame is 48 bits long. For implementers, this means the receiver must correctly recognize framing patterns and the transmitter must produce the specified coding and balance behavior.

Electrical and receiver/transmitter behavior

Clause 9 covers bitrate tolerance, jitter, pulse shape, pulse amplitude, impedance, noise immunity, round-trip delay and longitudinal conversion loss. Annex B supplies the test configurations used for these checks. This is the section that drives physical-layer design and lab verification of transceivers, cabling and termination.

Power feeding

Clause 10 defines power feeding over the interface, including power source 1, power source 2, phantom mode, restricted power conditions, current unbalance and additional requirements for an auxiliary power source (APS). In practice, this is the part that matters when the network powers the terminal, when backup power is present, or when the installation must keep basic service available during local power loss.

What terms does SIST EN 300 012-1 V1.2.2:2003 define?

• Basic access - the user-network access arrangement built from two B-channels and one D-channel, with a 16 kbit/s D-channel.
• Network Termination (NT) - the network-side layer 1 termination used at the basic access interface.
• Terminal Equipment (TE) - the terminal-side layer 1 equipment connected to the basic access interface.
• Terminal Endpoint Identifier (TEI) - the identifier used in the TEI procedures when a terminal determines whether it is connected.
• INFO3 - the normal activated signal sent by a TE when frame alignment has been established.
• INFO4 - the synchronized frame signal carrying operational data on B, D and D-echo channels.
• Auxiliary Power Source (APS) - an optional power source covered by the extra requirements in clause 10.8.

Who uses SIST EN 300 012-1 V1.2.2:2003?

SIST EN 300 012-1 V1.2.2:2003 is used by ISDN terminal manufacturers, network termination designers, telecom equipment suppliers and test laboratories. It is also relevant to operators, integrators and installers working on customer-premises basic access equipment, because it defines how the line must behave at the physical interface and how conformance is checked.

What changed in SIST EN 300 012-1 V1.2.2:2003 from the previous edition?

This version is identified as maintenance work with correction of safety provisions. The foreword also says the document includes editorial improvements of safety-related clauses.

Which standards are used with SIST EN 300 012-1 V1.2.2:2003?

The standard cites several documents that support its definitions, test methods and interface structure:

• ITU-T I.430 - the base layer 1 specification for the basic user-network interface.
• ITU-T I.411 and ITU-T I.412 - the reference configurations and access capabilities used to place the interface at S, T and S/T points.
• ISO/IEC 9646-1 - the conformance testing methodology used for ICS and IXIT concepts.
• ITU-T Q.921 and ITU-T Q.931 - the layer 2 and layer 3 ISDN protocols that interact with this layer 1.
• EN 28877 and EN 60603-7 - connector and contact assignment references.
• ETS 300 047-3 - protection requirements relevant to interface IA.
• ITU-T G.117 - the method for measuring unbalance about earth.
• EN 50081 - the emission standard cited for output signal balance.
• The foreword also says this part belongs to a 7-part series, with Parts 2 to 7 covering ICS, IXIT, conformance tests and ATS for interfaces IA and IB.

What does the SIST EN 300 012-1 V1.2.2:2003 document contain?

The document contains reference configurations, primitive tables, signal definitions, finite-state matrices, timing rules and electrical test requirements. Clause 7 includes the activation/deactivation state tables for TEs and NTs, and clause 9 includes the waveform masks, impedance templates and measurement conditions used in conformance testing.

It also includes detailed frame structure diagrams, D-channel access behavior, power-feeding reference arrangements and connector contact information. Annexes B and C are especially important for testing, because they define the test configurations and loopbacks used to verify layer 1 behavior.

Annex E, Annex F and Annex G provide SDL representations and a multiframing mechanism description, which are useful for implementation design and protocol validation rather than for everyday installation work.

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.:[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.©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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