SIST EN 300 299 V1.3.2:2003

• Abstract:

  To specify the requirements for a B-UNI applying to cell-based interfaces at 155 520 kbit/s and 622 080 kbit/s. This revision of edition 2 of ETS 300 299 (to be EN 300 299 V1.3.1) includes improvements and simplification of the scrambler mechanism and the OAM cell payload for these systems.

• 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 300 299 V1.3.2 (2000-05) - Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications

SIST EN 300 299 V1.3.2:2003 is the Slovenian adoption of ETSI EN 300 299 for Broadband Integrated Services Digital Network (B-ISDN) cell-based user network access. It specifies the physical layer interfaces for the B-UNI at 155 520 kbit/s and 622 080 kbit/s, including the PMD and Transmission Convergence (TC) sublayers and the UNI-related OAM functions used with B-ISDN applications.

What does SIST EN 300 299 V1.3.2:2003 specify?

SIST EN 300 299 V1.3.2:2003 specifies the physical layer interface at the SB and TB reference points of the B-ISDN cell-based UNI. It covers the interface structure, media characteristics, power feeding, cell handling, and operational behavior needed for B-ISDN terminal and network equipment.

The standard is organized into scope, references, definitions and abbreviations, reference configuration, user-network interface specifications, service and layering aspects, physical medium characteristics for 155 520 kbit/s and 622 080 kbit/s, power feeding, Transmission Convergence functions, UNI-related OAM functions, and operational functions.

Annex	What it covers
Annex A	Impact of random bit errors on cell delineation performance
Annex B	Distributed Sample Scrambler implementation example

What are the key requirements of SIST EN 300 299 V1.3.2:2003?

SIST EN 300 299 V1.3.2:2003 focuses on a few practical areas: the interface bit rates, the physical media to be used, how ATM cells are carried, how cell boundaries are found, and how maintenance information is inserted and interpreted. In practice, these clauses tell designers what the equipment must support so that different B-ISDN devices can interoperate.

Interface rates, locations, and physical media

Clauses 4, 5, 7, and 8 define the B-ISDN reference points TB, SB, and R, and place the interface between the socket and plug of the attached equipment. At 155 520 kbit/s the interface is symmetric; at 622 080 kbit/s the interface can be asymmetric or symmetric. Optical fibre is the preferred medium, but the document also allows electrical realizations and leaves room for existing customer cabling where needed.

Electrical and optical characteristics

For 155 520 kbit/s, the electrical interface uses two coaxial cables, 75 Ω impedance, and Coded Mark Inversion (CMI). For the optical interface, and for 622 080 kbit/s, the standard uses two single-mode fibres, NonReturntoZero (NRZ) coding, and an operating wavelength around 1310 nm. These details matter because they determine connector choice, cabling, attenuation limits, and compatibility between installed equipment.

Cell transport, HEC, and scrambling

Clause 10 specifies that the interface carries continuous ATM cells of 53 octets, with physical layer cells inserted as needed to match the interface rate. The Header Error Control (HEC) covers the whole cell header and supports single-bit correction or multiple-bit detection. The document also defines cell delineation and the Distributed Sample Scrambler (DSS), including the ALPHA and DELTA values used to find cell boundaries reliably.

OAM and maintenance cells

Clause 11 defines physical layer OAM flows F1 and F3, while F2 is not used. OAM cells carry maintenance signals, performance monitoring, and control communication, and their headers identify them before scrambling. For operators and integrators, this is the part that supports fault reporting, errored block monitoring, and end-to-end maintenance across the access link.

Power feeding and operational states

Clause 9 allows optional power feeding to B-NT1 through the UNI, with a separate wire pair, at least 15 W available, and a feeding voltage between -20 V and -57 V relative to ground. Clause 12 defines the user-side and network-side layer 1 states and the primitives exchanged with the management entity. This gives implementers a common way to signal power loss, LOS, LCD, AIS, RDI, and related fault conditions.

What terms does SIST EN 300 299 V1.3.2:2003 define?

• B-UNI - Broadband User-Network Interface, the B-ISDN user-network interface covered by this standard.
• B-NT1 - Broadband Network Termination 1, the network-termination function at the access boundary.
• B-NT2 - Broadband Network Termination 2, the higher-level network-termination function that can include adaptation, multiplexing, and OAM.
• B-TE - Broadband Terminal Equipment, the terminal-side function group connected to the B-UNI.
• B-TA - Broadband Terminal Adaptor, used to serve a TE2 or B-TE2 terminal through a B-ISDN UNI.
• PMD - Physical Medium Dependant sublayer, the part of the physical layer that depends on the cable or fibre medium.
• TC - Transmission Convergence sublayer, the part that handles cell transfer structure, HEC, delineation, and scrambling.
• OAM - Operations And Maintenance, the functions used for monitoring and maintenance of the UNI.

Who uses SIST EN 300 299 V1.3.2:2003?

SIST EN 300 299 V1.3.2:2003 is used by telecommunications equipment designers, network termination manufacturers, terminal equipment makers, and test laboratories working with B-ISDN access. It is also relevant to quality and procurement teams that need to confirm interface type, media, connector style, jitter limits, power feeding, and maintenance behavior. Network operators use it when specifying interoperable access equipment and when checking OAM and fault signaling.

What changed in SIST EN 300 299 V1.3.2:2003 from the previous edition?

SIST EN 300 299 V1.3.2:2003 states that this revision includes improvements and simplification of the scrambler mechanism and the OAM cell payload. The foreword also notes editorial improvement of the safety-related provisions.

Which standards are used with SIST EN 300 299 V1.3.2:2003?

Reference	What it contributes
ITU-T G.652	Characteristics of single-mode optical fibre cable
ETSI ETS 300 166	Electrical and physical characteristics for 2048 kbit/s-based digital interfaces
ETSI ETS 300 232	Optical interfaces for SDH-related equipment
ITU-T I.113	Vocabulary for broadband ISDN terms, including idle cell, valid cell, and invalid cell
ITU-T I.321	B-ISDN protocol reference model and its application
ITU-T I.361	ATM layer specification used for ATM cells and service primitives
ITU-T I.413	B-ISDN user-network interface framework
ITU-T I.432.1	General characteristics of B-ISDN physical layers
ITU-T I.432.2	Physical layer specification for 155 520 kbit/s and 622 080 kbit/s operation
ITU-T I.610 and ETSI ETS 300 404	OAM principles, functions, and amendments used for UNI-related maintenance
ITU-T G.825 and G.958	Jitter, wander, and jitter transfer limits for SDH-based transmission
ITU-T G.826	Error performance objectives used in OAM monitoring
IEC 60825-1	Laser safety classification and limits for optical interfaces
CENELEC EN 60950 and ETSI EG 201 212	Safety guidance and interface safety classification

What does the SIST EN 300 299 V1.3.2:2003 document contain?

The document contains reference configurations and example physical realizations for B-ISDN access, including figures for SB and TB placement, multipoint arrangements, and wiring location. It also contains the bit-rate and media parameters, HEC generation and receiver behavior, cell delineation state diagrams, DSS operation, OAM cell formats, maintenance signal definitions, and user/network state tables. Annex A and Annex B add informative material on random bit errors and a DSS implementation example, which are useful for design review, testing, and implementation work.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 299 Version 1.3.2SIST EN 300 299 V1.3.2:2003en01-december-2003SIST EN 300 299 V1.3.2:2003SLOVENSKI
STANDARD
ETSIEN300299V1.3.2(2000-05)EuropeanStandard(Telecommunicationsseries)BroadbandIntegratedServicesDigitalNetwork(B-ISDN);Cellbasedusernetworkaccessfor155520kbit/sand622080kbit/s;PhysicallayerinterfacesforB-ISDNapplicationsSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)2ReferenceREN/TM-06017-4Keywordsaccess,ATM,B-ISDN,interface,ISDN,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 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)3ContentsIntellectualPropertyRights.6Foreword.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.84Referenceconfigurationattheuser-networkinterface.94.1Functionalgroupsandreferencepoints.94.2Examplesofphysicalrealizations.104.3BasiccharacteristicsoftheinterfacesatTBandSBreferencepoints.144.3.1Characteristicsoftheinterfacesat155520kbit/s.144.3.1.1InterfaceattheTBreferencepoint.144.3.1.2InterfaceattheSBreferencepoint.144.3.1.3RelationshipbetweeninterfacesatSBandTB.144.3.2Characteristicsoftheinterfacesat622080kbit/s.144.3.2.1InterfaceatTBreferencepoint.144.4RelationshipbetweenISDNinterfaces.144.5Functionalgroupscharacteristics.144.5.1Networktermination1forB-ISDN.154.5.2Networktermination2forB-ISDN(B-NT2).154.5.3TerminalequipmentforB-ISDN(B-TE).154.5.3.1Terminalequipmenttype1forB-ISDN(B-TE1).164.5.3.2Terminalequipmenttype2forB-ISDN(B-TE2).164.5.4TerminaladapterforB-ISDN(B-TA).165Usernetworkinterfacespecifications.165.1Interfacelocationwithrespecttoreferenceconfiguration.165.2Interfacelocationwithrespecttothewiringconfiguration.166Serviceandlayeringaspectsofthephysicallayer.176.1ServicesprovidedtotheATM-layer.176.2ServiceprimitivesexchangedwiththeATMlayer.176.3Sublayeringofthephysicallayer.177PhysicalmediumcharacteristicsoftheUNIat155520kbit/s.187.1CharacteristicsoftheinterfaceattheTBandSBreferencepoints.187.1.1Bitrateandinterfacesymmetry.187.1.2Physicalcharacteristics.187.1.2.1Electricalinterface.187.1.2.1.1Interfacerange.187.1.2.1.2Transmissionmedium.187.1.2.1.3ElectricalparametersatinterfacepointsIaandIb.187.1.2.1.4Electricalconnectors.187.1.2.1.5Linecoding.197.1.2.1.6ElectromagneticCompatibility/Interference(EMC/EMI)requirements.197.1.2.2Opticalinterface.207.1.2.2.1Attenuationrange.207.1.2.2.2Transmissionmedium.207.1.2.2.3Opticalparameters.207.1.2.2.4Opticalconnectors.217.1.2.2.5Safetyrequirements.217.1.2.3Jitterandwander.21SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)48PhysicalmediumcharacteristicsoftheUNIat622080kbit/s.218.1CharacteristicsoftheinterfaceattheTBandSBreferencepoints.218.1.1Bitrateandinterfacesymmetry.218.1.2Physicalcharacteristics.228.1.2.1Attenuationrange.228.1.2.2Transmissionmedium.228.1.2.3Opticalparameters.228.1.2.3.1Linecoding.228.1.2.3.2Operatingwavelength.228.1.2.3.3Inputandoutputportcharacteristics.228.1.2.4Opticalconnectors.228.1.2.5Safetyrequirements.228.1.2.6Jitterandwander.239Powerfeeding.239.1Provisionofpower.239.2PoweravailableatB-NT1.239.3Feedingvoltage.239.4SafetyandProtectionrequirements.239.4.1Safety.239.4.2Protection.2410Functionsprovidedbythetransmissionconvergencesublayer.2410.1Transfercapability.2410.1.1Interfaceat155520kbit/s.2410.1.2Interfaceat622080kbit/s.2410.2Physicallayeraspects.2410.2.1Timing.2410.2.2Interfacestructurefor155520kbit/sand622080kbit/s.2410.3HeaderErrorControl(HEC).2510.3.1HECfunctions.2510.3.2HECsequencegeneration.2710.4Idlecells.2710.5Celldelineationandscrambling.2710.5.1Celldelineationandscramblingobjectives.2710.5.1.1Celldelineationalgorithm.2810.5.2Celldelineationperformance.2910.5.3Scrambleroperation.2910.5.3.1DistributedSampleScrambler(31storder)operation.2910.5.3.2Transmitteroperation.2910.5.3.3Receiveroperation.3010.5.3.4Statetransitiondiagramandmechanism.3111UNIrelatedOAMfunctions.3211.1Transmissionoverheadallocation.3211.2OAMcellidentification.3211.3AllocationofOAMfunctionsininformationfield.3311.4Maintenancesignals.3511.5Transmissionperformancemonitoring.3511.6Controlcommunication.3512Operationalfunctions.3512.1Descriptionofsignalsattheinterface.3512.1.1SignalsdefinedinITU-TRecommendationI.610.3512.1.2Celldelineationsignals.3612.2Definitionsofstatetablesatnetworkandusersides.3612.2.1Layer1statesontheusersideoftheinterface.3612.2.2Layer1statesatthenetworksideoftheinterface.3712.2.3Definitionofprimitives.3912.2.4Statetables.40SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)5AnnexA(informative):Impactofrandombiterrorsoncelldelineationperformance.43AnnexB(informative):DistributedSampleScramblerimplementationexample.45History.47SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)6IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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).ThepresentdocumentdefinesthecellbasedusernetworkaccessphysicallayerinterfacestobeappliedtotheTB,SBreferencepointsofthereferenceconfigurationsoftheBroadbandIntegratedServicesDigitalNetwork(B-ISDN)User-NetworkInterface(UNI)at155520kbit/sand622080kbit/s,forB-ISDNapplications.ItaddressesseparatelythePhysicalMediaDependant(PMD)andTransmissionConvergence(TC)sublayersusedattheseinterfacesandaddressesalsotheimplementationofUNIrelatedphysicallayerOperationsAndMaintenance(OAM)functions.ThepresentdocumenttakesintoaccounttherecommendationsgiveninITU-TRecommendationsI.413[7],I.432.1[8]andI.432.2[9].Thepresentdocumentincludesaneditorialimprovementofthesafetyrelatedprovisions.NationaltranspositiondatesDateoflatestannouncementofthisEN(doa):31August2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2001DateofwithdrawalofanyconflictingNationalStandard(dow):28February2001SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)71ScopeThepresentdocumentdefinesthephysicallayerinterfacetobeappliedtotheSBandTBreferencepointsofthereferenceconfigurationsoftheBroadbandIntegratedServicesDigitalNetwork(B-ISDN)cellbasedUser-NetworkInterface(UNI)at155520kbit/sand622080kbit/s.ItaddressesseparatelythePhysicalMediaDependant(PMD)andTransmissionConvergence(TC)sublayersusedattheseinterfaces,andaddressesalsotheimplementationofUNIrelatedphysicallayerOAMfunctions.TheselectionofthephysicalmediumfortheinterfacesattheSBandTBreferencepointsshouldtakeintoaccountthatopticalfibreisagreedasthepreferredmediumtobeusedtocablecustomerequipment.However,inordertoallowtheuseofexistingcablingofcustomerequipment,othertransmissionmedia(e.g.twistedpairsandcoaxialcables)shouldnotbeprecluded.Also,implementationsshouldallowterminalinterchangeability.Thepresentdocumentreflectsinitsstructureandcontentthedesiretotakecareofsuchearlyconfigurationsandintroducesadegreeoffreedomwhenchoosingaphysicalmediumatthephysicallayer.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ITU-TRecommendationG.652(1997):"Characteristicsofasingle-modeopticalfibrecable".[2]ETSIETS300166(1993):"TransmissionandMultiplexing(TM);Physicalandelectricalcharacteristicsofhierarchicaldigitalinterfacesforequipmentusingthe2048kbit/s-basedplesiochronousorsynchronousdigitalhierarchies".[3]ETSIETS300232(1993):"TransmissionandMultiplexing(TM);OpticalinterfacesforequipmentsandsystemsrelatingtotheSynchronousDigitalHierarchy[ITU-TRecommendationG.957(1993),modified]".[4]ITU-TRecommendationI.113(1997):"VocabularyoftermsforbroadbandaspectsofISDN".[5]ITU-TRecommendationI.321(1991):"B-ISDNprotocolreferencemodelanditsapplication".[6]ITU-TRecommendationI.361(1995):"B-ISDNATMlayerspecification".[7]ITU-TRecommendationI.413(1993):"B-ISDNuser-networkinterface".[8]ITU-TRecommendationI.432.1(1999):"B-ISDNuser-networkinterface-Physicallayerspecification:Generalcharacteristics".[9]ITU-TRecommendationI.432.2(1999):"B-ISDNuser-networkinterface-Physicallayerspecification:155520kbit/sand622080kbit/soperation".[10]ITU-TRecommendationI.610(1999):"B-ISDNoperationandmaintenanceprinciplesandfunctions".[11]ITU-TRecommendationX.200(1994):"Informationtechnology-OpenSystemsInterconnection-Basicreferencemodel:Thebasicmodel".SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)8[12]ETSIETS300404(1997):"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);B-ISDNOperationAndMaintenance(OAM)principlesandfunctions".[13]IEC60825-1(1993):"Safetyoflaserproducts:Part1:Equipmentclassification,requirementsanduser'sguide".[14]CENELECEN60950(1992):"Safetyofinformationtechnologyequipment".[15]ITU-TRecommendationG.825:"Thecontrolofjitterandwanderwithindigitalnetworkswhicharebasedonthesynchronousdigitalhierarchy(SDH)".[16]ITU-TRecommendationG.958(1994):"Digitallinesystemsbasedonthesynchronousdigitalhierarchyforuseonopticalfibrecables".[17]ITU-TRecommendationG.826(1999):"Errorperformanceparametersandobjectivesforinternational,constantbitratedigitalpathsatorabovetheprimaryrate".[18]ETSIEG201212(V1.2):"ElectricalSafety;Classificationofinterfacesforequipmenttobeconnectedtotelecommunicationnetworks".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thedefinitionsgiveninITU-TRecommendationI.113[4]apply,inparticularforthedefinitionsofidlecell,validcellandinvalidcell.Inaddition,thefollowingdefinitionapplies:tobedefined:theseitemsorvaluesarenotyetspecified.3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AIActivationIndicationAISAlarmIndicationSignalATMAsynchronousTransferModeBERBitErrorRateB-ISDNBroadbandIntegratedServicesDigitalNetworkB-NTB-ISDNNetworkTerminationB-TAB-ISDNTerminalAdaptorB-TEB-ISDNTerminalEquipmentBIPBitInterleavedParityB-UNIBroadbandUNICATVCAbleTeleVisionCECCellErrorControlCICorrectionIndicationCLPCellLossPriorityCMICodedMarkInversionCRCCyclicRedundancyCheckDIDeactivateIndicationDSSDistributedSampleScramblerEDCErrorDetectionCodeEIErrorIndicationEMCElectromagneticCompatibilityEMIElectroMagneticInterferenceHECHeaderErrorControlISDNIntegratedServicesDigitalNetworkLANLocalAreaNetworkSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)9LCDLossofCellDelineationLOMLossOfMaintenancecellLOSLossOfSignalLSBLeastSignificantBitMAMediumAdaptorMBSMonitoringBlockSizeMPHManagementPhysicalHeaderMSBMostSignificantBitNRZNonReturntoZeroOAMOperationAndMaintenanceOCDOutofCellDelineationOSIOpenSystemsInterconnectionP-AISPathAlarmIndicationSignalPh-SAPPhysicallayerServiceAccessPointPHPhysicalHeaderPMPhysicalMediumppmpartspermillionPRBSPseudo-RandomBinarySequencePSNPhysicallayerSequenceNumberRDIRemoteDefectIndicationREBRemoteErroredBlocksSDHSynchronousDigitalHierarchySTISurfaceTransferImpedanceTCTransmissionConvergenceTFVTerminalFailureVoltageUNIUser-NetworkInterfaceVCIVirtualChannelIdentifierVPIVirtualPathIdentifier4Referenceconfigurationattheuser-networkinterface4.1FunctionalgroupsandreferencepointsThereferenceconfigurationsdefinedforIntegratedServicesDigitalNetwork(ISDN)basicaccessandprimaryaccessareconsideredgeneralenoughtobeapplicabletoallaspectsoftheB-ISDNaccesses.Figure1showstheB-ISDNreferenceconfigurations,whichcontainthefollowing:-functionalgroups:B-NT1,B-NT2,B-TE1,TE2,B-TE2,andB-TA;-referencepoints:TB,SBandR.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)10B-TE1B-NT1B-TAReferencepointSBRSBFunctionalgroupB-TABroadbandTerminalAdaptorB-TEBroadbandTerminalEquipmentB-NTBroadbandNetworkTerminationB-NT2TBTE2orB-TE2Figure1:B-ISDNreferenceconfigurationsInordertoclearlyillustratethebroadbandaspects,thenotationsforreferencepointsandforfunctionalgroupswithbroadbandcapabilitiesareappendedwiththeletterB(e.g.B-NT1,TB).ThebroadbandfunctionalgroupsareequivalenttothefunctionalgroupsdefinedinISDN.InterfacesattheRreferencepointmayormaynothavebroadbandcapabilities.InterfacesatreferencepointsSBandTBwillbestandardized.TheseinterfaceswillsupportallISDNservices.4.2ExamplesofphysicalrealizationsFigure2givesexamplesofphysicalconfigurationsillustratingcombinationsofphysicalinterfacesatvariousreferencepoints.TheexamplescoverconfigurationsthatcouldbesupportedbystandardizedinterfacesatreferencepointsSBandTB.Otherconfigurationsmayalsoexist.Forexample,physicalconfigurationsofB-NT2maybedistributed,orusesharedmedium,tosupportLocalAreaNetwork(LAN)emulationandotherapplications.Figure3illustratespossiblephysicalconfigurations,butdoesnotprecludealternativeconfigurations.WhetherasingleinterfaceattheSBreferencepointcancoverdifferentconfigurations,asillustratedinfigure3,isforfurtherstudy.Figure2issubdividedintoseparateitemsasfollows:-figures2a)and2b)showseparateinterfacesattheSBandTBreferencepoints;-figures2c)and2d)showaninterfaceatSBbutnotatTB;-figures2e)and2f)showaninterfaceatTBbutnotatSB;-figures2g)and2h)showseparateinterfacesatS,SBandTB;-figures2i)and2j)showinterfacesatSBandTBwhicharecoincident.Additionally,figures2b),2d),2f),2h)and2j)showaninterfaceatreferencepointR.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)11B-NT2TSB-NT1BBa)B-TE1B-NT2TSB-NT1BBB-TARb)TE2orB-TE2ConfigurationswhereB-ISDNphysicalinterfacesoccuratreferencepointsSBandTBSBc)B-NT1B-NT2+B-TE1SBB-TARd)B-NT1B-NT2+TE2orB-TE2NoteConfigurationswhereB-ISDNphysicalinterfacesoccuratreferencepointSBonlyB-NT2B-NT1+e)B-TETBTB-NT1BB-TARB-NT2+f)TE2orB-TE2ConfigurationswhereB-ISDNphysicalinterfacesoccuratreferencepointTBonlyB-NT2TSB-NT1BSBRh)TATE2B-TE1B-NT2TSB-NT1BTE1g)B-TE1SBConfigurationswhereB-ISDNandISDNphysicalinterfacesoccuratreferencepointsS,SBandTBB-NT1RB-TAj)TE2orB-TE2SandTcoincidentBBB-NT1B-TE1i)SandTcoincidentBBConfigurationswhereasingleB-ISDNphysicalinterfaceoccursatalocationwherebothreferencepointsSBandTBcoincideEquipmentimplementingfunctionalgroupsPhysicalinterfaceatthedesignatedreferencepointNOTE:TheneededforanaccesstoaTBreferencepointbetweenB-NT1andB-NT2isforfurtherstudy.Figure2:ExamplesofphysicalconfigurationsforbroadbanduserapplicationsSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)12a)centralizedB-NT2configuration:B-TE1B-TE1B-TE1B-NT2B-NT1TBSBSBSBb)distributedB-NT2configurations:b1)genericconfigurationWWMAMAWMA(note1)SBSBRTE2orB-TE2B-TAB-NT1B-NT2MAB-TARTE2orB-TE2B-TE1TB(note2)b2)physicalconfigurations(note1)MAB-TE1B-NT1WWTBTBMAMAB-TE1SBSBB-NT1B-TE1SBWWWWB-TE1B-TE1MAMAMAMASBSB(note1)Figure3(sheet1/2):ExamplesofphysicalconfigurationsformultipointapplicationsSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)13c)multi-accessB-TEconfigurations:c1)genericconfigurations(note7)TBB-NT1B-NT2SBB-TE*B-TE*B-TE*SSBSSB(note3)c2)physicalconfigurations(note5)(note4)(note6)B-NT2B-NT1SSBSSBSBTBB-TE*B-TE*B-TE*SBB-NT2B-NT1SSBSSBSBTBB-TE*B-TE*B-TE*(note5)(note4)SSBSSBSSBSSBSSBSSBSBSBSBB-NT2B-NT1TBB-TE*B-TE*B-TE*B-TE*B-TE*B-TE*B-TE*B-TE*B-TE*NOTE1:MediumAdaptor(MA):accommodatesthespecifictopologyofthedistributedB-NT2.TheinterfaceatWmayincludetopologydependantelementsandmaybeanon-standardizedinterface.NOTE2:TherewillbeaphysicallinkbetweenthesetwoMAsinthecaseofringconfigurations.NOTE3:TherewillbeaphysicallinkbetweenB-TE*andB-NT2inthecaseofringconfigurations.NOTE4:TheB-TE*includessharedmediumaccessfunctions.NOTE5:ThemeasurablephysicalcharacteristicsoftheSSBinterfaceareidenticaltothoseoftheSBinterface.Thefunctionalcharacteristicsoftheinterface,however,maybeasupersetofthoseattheSBinterface.NOTE6:TheB-NT2maybenullinthecaseofcommonalitybetweenSBandTB.NOTE7:Additionalterminationfunctions(e.g.forloopbackinbusconfiguration)andOAMfunctionsmaybenecessaryformulti-accessB-TEconfigurations.Requirementsandimplementationsofthesefunctionsareforfurtherstudy.Figure3(sheet2/2):ExamplesofphysicalconfigurationsformultipointapplicationsSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)144.3BasiccharacteristicsoftheinterfacesatTBandSBreferencepoints4.3.1Characteristicsoftheinterfacesat155520kbit/s4.3.1.1InterfaceattheTBreferencepointThereisonlyoneinterfaceperB-NT1attheTBreferencepoint.Theoperationofthephysicalmediumispoint-to-pointinthesensethatthereisonlyonesink(receiver)infrontofonesource(transmitter).Point-to-multipointconfigurationsatTBatAsynchronousTransferMode(ATM)andhigherlayersareforfurtherstudy.4.3.1.2InterfaceattheSBreferencepointOneormoreSBinterfacesperB-NT2arepresent.TheinterfaceattheSBreferencepointispoint-to-pointatthephysicallayerinthesensethatthereisonlyonesink(receiver)infrontofonesource(transmitter)andmaybepointtomultipointattheotherlayers.4.3.1.3RelationshipbetweeninterfacesatSBandTBConfigurationsdescribedinfigures2i)and2j)requirethattheinterfacespecificationsatTBandSBshouldhaveahighdegreeofcommonality,inordertoensurethatasimplebroadbandterminalmaybeconnecteddirectlytotheTBinterface.Thefeasibilityofachievingtheneededcommonalityisforfurtherstudy.4.3.2Characteristicsoftheinterfacesat622080kbit/s4.3.2.1InterfaceatTBreferencepointThereisonlyoneinterfaceperB-NT1attheTBreferencepoint.Theoperationofthephysicalmediumispoint-to-pointinthesensethatthereisonlyonesink(receiver)infrontofonesource(transmitter).Point-to-multipointconfigurationsatTBatATMandhigherlayersareforfurtherstudy.4.4RelationshipbetweenISDNinterfacesFigures2g)and2h)showconfigurationswhereB-ISDNandISDNinterfacesmayoccuratSBandSrespectively.Inthiscase,B-NT2functionalitieshavetoensuretheinterfacecapabilitiesforbothSandSB.OtherconfigurationsforsupportingterminalsattheinterfaceattheSreferencepointmayexist.4.5FunctionalgroupscharacteristicsListsoffunctionsforeachfunctionalgrouparegivenbelow.Eachparticularfunctionisnotnecessarilyrestrictedtoasinglefunctionalgroup.Forexample,"interfacetermination"functionsareincludedinthefunctionlistsofB-NT1,B-NT2andB-TE.ThefunctionlistsforB-NT1,B-NT2,B-TEandB-TAarenotexhaustive.Notallspecificfunctionsinafunctionalgroupneedtobepresentinallimplementations.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)154.5.1Networktermination1forB-ISDNThisfunctionalgroupincludesfunctionsbroadlyequivalenttolayer1oftheOpenSystemInterconnection(OSI)referencemodel.ExamplesofB-NT1functionsare:-linetransmissiontermination;-transmissioninterfacehandling;-celldelineation;-OAMfunctions.4.5.2Networktermination2forB-ISDN(B-NT2)Thisfunctionalgroupincludesfunctionsbroadlyequivalenttolayer1andhigherlayersoftheITU-TRecommendationX.200[11]referencemodel.B-NT2canbenullinthecaseofcommonalitybetweenTBandSB.ExamplesofB-NT2functionsare:-adaptationfunctionsfordifferentmediaandtopologies(MAfunctions);-functionsofadistributedB-NT2;-celldelineation;-concentration;-buffering;-multiplexing/demultiplexing;-resourceallocation;-usageparametercontrol;-adaptationlayerfunctionsforsignalling(forinternaltraffic);-interfacehandling(fortheTBandSBinterfaces);-OAMfunctions;-signallingprotocolhandling;-switchingofinternalconnections.B-NT2implementationsmaybeconcentratedordistributed.Inaspecificaccessarrangement,theB-NT2mayconsistonlyofphysicalconnections.Whenpresent,implementationsoftheB-NT2arelocallypowered.4.5.3TerminalequipmentforB-ISDN(B-TE)Thisfunctionalgroupincludesfunctionsbroadlybelongingtolayer1andhigherlayersoftheITU-TRecommendationX.200[11]referencemodel.ExamplesofB-TEfunctionsare:-user/useranduser/machinedialogueandprotocol;-interfaceterminationandotherlayer1functions;-protocolhandlingforsignalling;-connectionhandlingtootherequipments;-OAMfunctions.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)16ThepossibilityofpoweringtheB-TEviatheSBinterfaceisforfurtherstudy.4.5.3.1Terminalequipmenttype1forB-ISDN(B-TE1)ThisfunctionalgroupincludesfunctionsbelongingtotheB-TEfunctionalgroupwithaninterfacethatcomplieswiththeB-ISDNSBand/orTBinterfaceENs.4.5.3.2Terminalequipmenttype2forB-ISDN(B-TE2)ThisfunctionalgroupincludesfunctionsbelongingtothefunctionalgroupB-TEbutwithabroadbandinterfacethatcomplieswithinterfacerecommendationsotherthantheB-ISDNinterfacerecommendationsorinterfacesnotincludedinITU-TRecommendations.4.5.4TerminaladapterforB-ISDN(B-TA)Thisfunctionalgroupincludesfunctionsbroadlybelongingtolayer1andhigherlayersoftheITU-TRecommendationX.200[11]referencemodelthatallowaTE2oraB-TE2terminaltobeservedbyaB-ISDNuser-networkinterface.5Usernetworkinterfacespecifications5.1InterfacelocationwithrespecttoreferenceconfigurationAninterfacepointIaisadjacenttotheB-TEortheB-NT2ontheirnetworkside;interfacepointIbisadjacenttotheB-NT2andtotheB-NT1ontheiruserside(seefigure4).B-TEB-NT2B-NT1BSTBIabIIabIFigure4:ReferenceconfigurationatreferencepointsSBandTB5.2InterfacelocationwithrespecttothewiringconfigurationTheinterfacepointsarelocatedbetweenthesocketandtheplugoftheconnectorattachedtotheB-TE,B-NT2orB-NT1.Thelocationoftheinterfacepointisshowninfigure5.Inthepresentdocument,theterm"B-NT"isusedtoindicatenetworkterminatinglayer1aspectsofB-NT1andB-NT2functionalgroups,andtheterm"TE"isusedtoindicateterminalterminatinglayer1aspectsofB-TE1,B-TAandB-NT2functionalgroups,unlessotherwiseindicated.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)17connectingcordWiringatthecustomerpremisesB-TEB-NTIabI(note)NOTE:Thelengthoftheconnectingcordcanbezero.Figure5:Wiringconfiguration6Serviceandlayeringaspectsofthephysicallayer6.1ServicesprovidedtotheATM-layerThephysicallayerprovidesforthetransparenttransmissionofATM-PDUsbetweenPhysicallayerServiceAccessPoints(Ph-SAP).TheATM-PDUiscalledATMcell.TheATMcellisdefinedinITU-TRecommendationI.361[6].AsnoaddressingisimplementedinthephysicallayeronlyasinglePh-SAPcanexistattheboundarybetweenphysicallayerandATMlayer.TheinterarrivaltimebetweencellspassedtotheATMlayerisnotdefined(asynchronoustransmission).ThephysicallayerprovidestheATMlayerwithtiminginformation.6.2ServiceprimitivesexchangedwiththeATMlayerTheserviceprimitivesbetweenphysicallayerandATMlayeraredefinedinITU-TRecommendationI.361[6],subclause3.2.6.3SublayeringofthephysicallayerThephysicallayerissubdividedintotwosublayers:-thePhysicalMedium(PM)sublayer;-theTransmissionConvergence(TC)sublayer.NoserviceaccesspointandserviceprimitivesaredefinedbetweenthePMandtheTCsublayers.ThefunctionsoftheindividualsublayeraredefinedinITU-TRecommendationI.321[5].SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)187PhysicalmediumcharacteristicsoftheUNIat155520kbit/s7.1CharacteristicsoftheinterfaceattheTBandSBreferencepoints7.1.1BitrateandinterfacesymmetryThebitrateoftheinterfaceis155520kbit/s.Theinterfaceissymmetric,i.e.ithasthesamebitrateinbothtransmissiondirections.Thenominalbitrateinfreerunningclockmodeshallbe155520kbit/swithatoleranceof±20ppm.7.1.2PhysicalcharacteristicsBothopticalandelectricalinterfacesarerecommended.Theimplementationselecteddependsonthedistancetobecoveredanduserrequirementsarisingfromthedetailsoftheinstallation.7.1.2.1Electricalinterface7.1.2.1.1InterfacerangeThemaximumrangeoftheinterfacedependsonthespecificattenuationofthetransmissionmediumused.Forexampleamaximumrangeofabout100mformicrocoax(4mmdiameter)and200mforCableTelevision(CATV)type(7mmdiameter)cablescanbeachieved.7.1.2.1.2TransmissionmediumTwocoaxialcables,oneforeachdirection,shallbeused.Thewiringconfigurationshallbepoint-to-point.Theimpedanceshallbe75Ωwithatoleranceof±5%inthefrequencyrange50MHzto200MHz.TheattenuationoftheelectricalpathbetweentheinterfacepointsIaandIbshallbeassumedtofollowanapproximateflawandtohaveamaximuminsertionlossof20dBatafrequencyof155520kHz.7.1.2.1.3ElectricalparametersatinterfacepointsIaandIbThedigitalsignalpresentedattheoutputportandtheportimpedanceshallconformtoETSIETS300166[2]fortheinterfaceat155520kbit/s.ThedigitalsignalpresentedattheinputportandtheportimpedanceshallconformtoETSIETS300166[2]fortheinterfaceat155520kbit/s,modifiedbythecharacteristicsoftheinterconnectingcoaxialpair.7.1.2.1.4ElectricalconnectorsThepresentationofinterfacepointIbatB-NT1orB-NT2shallbeviaasocket.ThepresentationofinterfacepointIaatB-TEorB-NT2shallbeusingeither:a)asocket,i.e.theconnectionshallbemadetotheequipmenttowardthenetworkwithacablewithplugsonbothends;orb)anintegralconnectingcordwithplugonthefreeend.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)197.1.2.1.5LinecodingThelinecodingshallbeCodedMarkInversion(CMI),seeETSIETS300166[2].7.1.2.1.6ElectromagneticCompatibility/Interference(EMC/EMI)requirementsShieldingpropertiesofconnectorsandcablesaredefinedbythespecificationoftherespectivevaluesfortheSurfaceTransferImpedance(STI).ThetemplateindicatingthemaximumSTIvaluesforCATVcablesisgiveninfigure6.Forconnectors,thesetemplatevaluesshallbemultipliedby10(20dB).TheimmunityoftheinterfaceagainstinducednoiseonthetransmissionmediumshouldbespecifiedbymeansofaTerminalFailureVoltage(TFV),whichisoverlaidtothedigitalsignalattheoutputport.Figure7showsapossiblemeasurementconfiguration.ThereceivershouldtolerateasinusoidalTFVwiththevaluesdefinedinfigure8andtable1withoutdegradationoftheBitErrorRatio(BER)performance.BlogSTIAf012logfrequencyff10frequency(MHz):STIvalue(ΩΩΩΩ/m):f0=0,1A=0,01f1=100f2=1000B=1NOTE:Theapplicabilityofthesevaluesformicrocoaxcablesisforfurtherstudy.Figure6:MaximumSTIvaluesasafunctionoffrequencyTransmitsignalgeneratorTransmissioncableReceiverundertestBERAnalyserTFVGenerator+Figure7:MeasurementconfigurationSIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)20TFVleveldBVF0frequency(MHz)1F2FA1A2Figure8:TerminalFailureVoltage(TFV)frequencyresponseTable1:TFVvaluesfrequency(MHz)TFVamplitude(dBV)(0dBV=1Vop)F0=1F1=200A1≥-17F2=400A2≥-117.1.2.2Opticalinterface7.1.2.2.1AttenuationrangeTheattenuationoftheopticalpathbetweenthespecificationpointsSandR,asdefinedinETSIETS300232[3],shallbeintherangeof0dBto7dB(seesubclause7.1.2.2.3.3).7.1.2.2.2TransmissionmediumThetransmissionmediumshallconsistoftwosinglemodefibresaccordingtoITU-TRecommendationG.652[1],oneforeachdirection.7.1.2.2.3Opticalparameters7.1.2.2.3.1LinecodingThelinecodingshallbebinaryNonReturntoZero(NRZ).Theconventionusedforopticallogiclevelis:-emissionoflightforabinaryONE;-noemissionoflightforabinaryZERO.TheextinctionratioshallbeinaccordancewithETSIETS300232[3],applicationcodeI-1.7.1.2.2.3.2OperatingwavelengthTheoperatingwavelengthshallbearound1310nm(secondwindow)andinaccordancewithETSIETS300232[3],applicationcodeI-1.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)217.1.2.2.3.3InputandoutputportcharacteristicsTheopticalparametersshallbeinaccordancewithETSIETS300232[3],applicationcodeI-1.Somenationalapplicationmayuseopticalparametersformulti-modefibres.ThespecificationpointsassociatedwithinterfacepointsIaandIbcorrespondtomeasurement"referencepoints"SandRasdefinedinETSIETS300232[3].Theopticalparametersarespecifiedforthetransmitterandreceiveratthesespecificationpointsandfortheopticalpathbetweenthesespecificationpoints,i.e.theconnectorattheinterfaceisconsideredtobepartoftheequipmentandnotpartofthefibreinstallation.7.1.2.2.4OpticalconnectorsThepresentationofinterfacepointIbatB-NT1orB-NT2shallbeviaasocket.ThepresentationofinterfacepointIaatB-TEorB-NT2shallbeusingeither:a)asocket,i.e.theconnectionshallbemadetotheequipmenttowardthenetworkwithacablewithplugsonbothends;orb)anintegralconnectingcordwithplugonthefreeend.7.1.2.2.5SafetyrequirementsForsafetyreasons,theparametersforIEC60825-1[13],Class1devicesshallnotbeexceeded,evenunderfailureconditions.7.1.2.3JitterandwanderForbothelectricalandopticalBroadbandUNI(B-UNI),theinterfaceoutputjittershallbeinaccordancewiththeappropriatelimitgiveninITU-TRecommendationG.825[15]fortheelectricalandopticalinterface.EquipmentshavinganelectricaloropticalB-UNI(e.g.B-NT1,B-NT2,B-TE)andwhichmeettheoutputjittertoleranceandthejittertransferspecificationsgiveninITU-TRecommendationsG.825[15]andG.958[16]respectively,areassuredofproperoperationwhentheinterfaceoutputjitterconformstothelimitsinITU-TRecommendationG.825[15].8PhysicalmediumcharacteristicsoftheUNIat622080kbit/s8.1CharacteristicsoftheinterfaceattheTBandSBreferencepoints8.1.1BitrateandinterfacesymmetryThebitrateoftheinterfaceinatleastonedirectionshallbe622080kbit/s.Thefollowingpossibleinterfaceshavebeenidentified:a)anasymmetricalinterfacewith622080kbit/sinonedirectionand155520kbit/sintheotherdirection;b)asymmetricalinterfacewith622080kbit/sinbothdirections.Ifoptiona)ischosen,thenthe155520kbit/scomponentshouldcomplywiththecharacteristicsasgiveninclause7.Thenominalbitrateinfreerunningclockmodeshallbe622080kbit/swithatoleranceof±20ppm.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)228.1.2PhysicalcharacteristicsForthepurposesofthepresentdocument,onlytheopticalinterfaceisconsidered.8.1.2.1AttenuationrangeTheattenuationoftheopticalpathbetweenthespecificationpointsSandRshallbeintherangeof0dBto7dB(seesubclause7.1.2.2.3.3).8.1.2.2TransmissionmediumThetransmissionmediumshallconsistoftwosinglemodefibresaccordingtoITU-TRecommendationG.652[1],oneforeachdirection.8.1.2.3Opticalparameters8.1.2.3.1LinecodingThelinecodingshallbebinaryNonReturntoZero(NRZ).Theconventionusedforopticallogiclevelis:-emissionoflightforabinaryONE;-noemissionoflightforabinaryZERO.TheextinctionratioshallbeinaccordancewithETSIETS300232[3],applicationcodeI-4.8.1.2.3.2OperatingwavelengthTheoperatingwavelengthshallbearound1310nm(secondwindow)andinaccordancewithETSIETS300232[3],applicationcodeI-4.8.1.2.3.3InputandoutputportcharacteristicsTheopticalparametersshallbeinaccordancewithETSIETS300232[3],applicationcodeI-4.ThespecificationpointsassociatedwithinterfacepointsIaandIbcorrespondtomeasurementreferencepointsSandRasdefinedinETSIETS300232[3].Theopticalparametersarespecifiedforthetransmitterandreceiveratthesespecificationpointsandfortheopticalpathbetweenthesespecificationpoints,i.e.theconnectorattheinterfaceisconsideredtobepartoftheequipmentandnotpartofthefibreinstallation.8.1.2.4OpticalconnectorsThepresentationofinterfacepointIbatB-NT1orB-NT2shallbeviaasocket.ThepresentationofinterfacepointIaatB-TEorB-NT2shallbeusingeither:a)asocket,i.e.theconnectionshallbemadetotheequipmenttowardthenetworkwithacablewithplugsonbothends;orb)anintegralconnectingcordwithplugonthefreeend.8.1.2.5SafetyrequirementsForsafetyreasons,theparametersforIEC60825-1[13],Class1devicesshallnotbeexceededevenunderfailurecondition.SIST EN 300 299 V1.3.2:2003

ETSIETSIEN300299V1.3.2(2000-05)238.1.2.6JitterandwanderForbothelectricalandopticalB-UNI,theinterfaceoutputjittershallbeinaccordancewiththeappropriatelimitgiveninITU-TRecommendationG.825[15]fortheelectricalandopticalinterface.EquipmentshavinganelectricaloropticalB-UNI(e.g.B-NT1,B-NT2,B-TE)andwhichmeettheoutputjittertoleranceandthejittertransferspecificationsgiveninITU-TRecommendationsG.825[15]andG.958[16]respectively,areassuredofproperoperationwhentheinterfaceoutputjitterconformstothelimitsinITU-TRecommendationG.825[15].9Powerfeeding9.1ProvisionofpowerTheprovisionofpowertotheB-NT1viatheUNInetworkinterfaceisoptional.IfthepowerisprovidedviatheUNI,thefollowingconditionsshallapply:-aseparatepairofwiresshallbeusedfortheprovisionofpowertotheB-
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