SIST EN 300 463 V1.1.2:2003

• Abstract:

  The revision of this document is exclusively restricted to the provisions related to Safety. cal change, the revision will be editorial.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.20 - Transmission systems
• 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 300 463 V1.1.2 (2000-06) - Transmission and Multiplexing (TM); Requirements of passive Optical Access Networks (OANs) to provide services up to 2 Mbit/s bearer capacity

SIST EN 300 463 V1.1.2:2003 is the Slovenian adoption of ETSI EN 300 463 Version 1.1.2. It specifies requirements for passive Optical Access Networks (OANs) that provide services up to 2 Mbit/s bearer capacity, mainly for narrowband access between the user network interface and the local exchange.

What does SIST EN 300 463 V1.1.2:2003 specify?

SIST EN 300 463 V1.1.2:2003 defines the characteristics of an Optical Access Network (OAN) built around optical fibre and passive splitting, with service support up to 2 Mbit/s. It focuses on business and residential access, not distributive services such as cable television.

The standard describes the OAN structure and then sets out requirements for the ONU, ODN and OLT, plus timing, Operations Administration and Maintenance (OAM), security, reliability and upgrade aspects. It is organized in clauses 1 to 14 and four informative annexes.

Annex	What it covers
Annex A	Relationship between ONU types and classes
Annex B	Example power consumption for an OAN
Annex C	Signal transfer delay measurement technique
Annex D	Framework for OAM requirements

What are the key requirements of SIST EN 300 463 V1.1.2:2003?

SIST EN 300 463 V1.1.2:2003 requires an OAN to support a defined set of access services, including POTS, leased lines, packet data, ISDN-BA, ISDN-PRA, nx64 kbit/s and 2 Mbit/s structured or unstructured services. In practice, this tells a buyer or designer which customer services the network must be able to carry.

Clause 4 and clause 8 describe the network structure and transmission approach. An OAN uses one OLT, at least one ODN, at least one ONU and Adaptation Units (AUs), and the transmission method shall allow point-to-multipoint operation based on Time Division Multiple Access (TDMA) and/or Subcarrier Multiple Access (SCMA). This matters because the chosen access method and fibre arrangement determine how the network is built and expanded.

Clause 5 sets ONU capacity in two ways: by POTS circuit count and by bearer-channel class. The document also allows unused B channels to be reassigned between ONUs and permits mixed ONU types and classes on the same ODN. That gives operators flexibility when service demand changes.

Clauses 6 and 7 set reach and capacity expectations for the ODN and OLT. The OAN shall operate over distances up to 20 km, with split ratios that depend on the system type, and the differential fibre distance between the nearest and furthest ONU shall be at least 5 km. For procurement, this is the practical check on whether a proposed plant layout can serve the intended area.

Clause 8 defines the operating wavelength regions and signal transfer delay. The standard keeps narrowband operation in the 1310 nm region, with an interim downstream WDM option in the 1550 nm region, and it sets mean signal transfer delay limits for ISDN-BA and other services. This is important where service quality, synchronisation and call setup delay must be controlled.

Clause 9 covers timing and synchronisation. The OAN timing shall be traceable to the same Primary Reference Clock (PRC) as the PSTN switches in the operator domain, with defined reference options, jitter and wander limits, and clock transparency for unstructured 2 Mbit/s services. Engineers use this section to decide how the access network will lock to the wider telecom timing plan.

Clause 10 and clause 11 cover OAM and security. The document adopts the M.3010 management model, requires management access at the OLT, addresses line configuration and testing, and sets security expectations for identification, authentication, access control, audit, data integrity and confidentiality. In practice, these clauses affect fault handling, remote management and protection of customer data.

What terms does SIST EN 300 463 V1.1.2:2003 define?

• Optical Access Network (OAN) - A set of access links that share the same network-side interfaces and are supported by optical access transmission systems.
• Optical Distribution Network (ODN) - The optical transmission means between the OLT and the users in both directions.
• Optical Line Termination (OLT) - The network-side interface of the OAN, connected to one or more ODNs.
• Optical Network Unit (ONU) - The user-side interface of the OAN, located at or near the customer side.
• Adaptation Unit (AU) - A unit that adapts service interfacing between the ONU and the user.
• Field Replaceable Unit (FRU) - The smallest maintenance spare, typically a plug-in card.
• User Network Interface (UNI) - The interface between the access network and the user equipment.

Who uses SIST EN 300 463 V1.1.2:2003?

SIST EN 300 463 V1.1.2:2003 is used by telecom network operators, access-network designers, and equipment vendors working on passive optical access systems. It is also relevant to integrators, test teams and maintenance staff who need to configure ONUs and OLTs, verify timing, manage OAM, and assess security and reliability for narrowband customer services.

What changed in SIST EN 300 463 V1.1.2:2003 from the previous edition?

SIST EN 300 463 V1.1.2:2003 is a revision whose scope is restricted to safety-related provisions, and the change is described as editorial in technical terms. The publication history also identifies the earlier ETS 300 463 Version 1.1.2 publication.

Which standards are used with SIST EN 300 463 V1.1.2:2003?

SIST EN 300 463 V1.1.2:2003 relies on ETSI and ITU-T references that define the interfaces, timing, ODN structure and management context used by the OAN.

• ETS 300 681 - Defines the ODN for OANs, including point-to-multipoint options, wavelength regions and split-related parameters.
• ETS 300 736 - Provides the OAM requirements for OANs.
• ETS 300 462-2 and ETS 300 462-5 - Provide synchronization architecture and slave-clock timing characteristics.
• ETS 300 324, ETS 300 347, ETS 300 233, ETS 300 011, ETS 300 012, ETS 300 288, ETS 300 418 - Cover the network and user interfaces used for V5, ISDN and leased-line services.
• EN 300 376-1 and EN 300 378-1 - Cover Q3 management interfaces for configuration, fault and performance management.
• ITU-T G.703, G.704, G.803, G.823, G.832, I.430, M.3010 - Define physical interfaces, frame structures, transport architecture, jitter and wander, synchronization transport and TMN principles.
• EN 60950, EG 201212, ITSEC, SYN 287, SYN 288 - Provide the safety, interface security and privacy context referenced by the standard.

What does the SIST EN 300 463 V1.1.2:2003 document contain?

The document contains configuration diagrams, service-capability tables, ONU type and class definitions, OLT dimension tables, and service-interface mappings. It also includes practical guidance for power-consumption estimation, signal transfer-delay measurement, OAM classification and security layering.

Annex B gives example power calculations for ONUs, Annex C shows a delay measurement setup using a V5.1 simulator and loopback arrangements, and Annex D breaks OAM into functional subsystems and management categories. These parts are useful when designing equipment, planning tests, or preparing management and maintenance procedures.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transmission and Multiplexing (TM); Requirements of passive Optical Access Networks (OANs) to provide services up to 2 Mbit/s bearer capacity33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 300 463 Version 1.1.2SIST EN 300 463 V1.1.2:2003en01-december-2003SIST EN 300 463 V1.1.2:2003SLOVENSKI
STANDARD
ETSIEN300463V1.1.2(2000-06)EuropeanStandard(Telecommunicationsseries)TransmissionandMultiplexing(TM);RequirementsofpassiveOpticalAccessNetworks(OANs)toprovideservicesupto2Mbit/sbearercapacitySIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)2ReferenceREN/TM-01088Keywordsaccess,bearer,network,optical,transmissionETSI650RoutedesLuciolesF-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 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94ConfigurationofanOAN.104.1Topologicalandfunctionalissues.104.2Servicecapability.135ONU.135.1Descriptionoffunctions.135.1.1ONUcoreshell.145.1.2ONUserviceshell.145.1.3ONUcommonshell.145.2ONUdimensions.145.3UsertoNetworkInterfaces(UNIs).155.4ONUpowerconsiderations.166ODN.166.1GeneralODNrequirements.166.2ReachlimitationsandsplitratiosoftheODN.177OLT.177.1Descriptionoffunctions.187.1.1OLTcoreshell.187.1.2OLTserviceshell.197.1.3OLTcommonshell.197.2OLTdimensions.197.3SNIs.208SpecificattributesofOANs.208.1Transmissionmethod.208.2OperatingwavelengthrangeforanOAN.208.2.1SDM.218.2.2TCM.218.2.3WDM.218.2.4FDM.218.3Signaltransferdelay.219Timingandsynchronization.229.1Synchronizationarchitecture.229.2ProtectionandONUtiming.239.3Synchronizationinterfaces.239.3.1Jitterandwandertolerance.239.4Network-sideinterfacesforsynchronousservices.239.4.1Jitterandwandertolerance.239.4.2Jitterandwandergeneration.239.5User-sideinterfacesforsynchronousservices.249.5.1Jitterandwandertolerance.249.5.2Jitterandwandergeneration.249.6Timingrequirementsforasynchronousservices.2410OAM.2410.1GeneralOAMrequirements.24SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)410.2Lineconfigurationandtesting.2510.3OANoperation.2511SecurityofOANs.2611.1Generalinformation.2611.2Identificationandauthentication.2611.3Accesscontrol.2711.4Accountabilityandaudit.2711.5Accuracy.2711.6Availability.2711.7Dataexchange.2711.8Layersofphysicalsecurity.2811.8.1Physicalsecurityfunction.2811.8.2Transmissionsystemsecurityfunction.2811.8.3Servicesecurityfunction.2912Safety.2913Reliabilityandavailability.2914UpgradeofOANs.3014.1ODNconsiderations.3014.2ONUconsiderations.31AnnexA(informative):RelationshipbetweentypesandclassesforONUs.32AnnexB(informative):AnexamplepowerconsumptionforanOAN.33AnnexC(informative):Signaltransferdelaymeasurementtechnique.35AnnexD(informative):FrameworktocapturetheOAMrequirements.36D.1AnalysisofOAMrequirementsbyfunctionalsub-systems.36D.2Examplesforlinecircuitsupervision.37D.3AnalysisofOAMrequirementsbyfunctionalcategory.38D.3.1Accessandsecurity.38D.3.2Configurationandresourcemanagement.38D.3.3Performancemanagement.39D.3.4Event(alarm)management.40D.3.5Financialaccountingmanagement.41Bibliography.42History.43SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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).Thepresentdocumentdescribescosteffectiveandflexibleaccessnetworksusingopticalfibretechnologyandisdesignedtoprovidebothservicestomeetthecurrentdemandsandaninfrastructure,whichisabletosatisfytherequirementsofthefuture.NationaltranspositiondatesDateoflatestannouncementofthisEN(doa):30September2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2001DateofwithdrawalofanyconflictingNationalStandard(dow):31March2001SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)61ScopeThepresentdocumentdescribescosteffectiveandflexibleaccessnetworksusingopticalfibretechnology.Thepresentdocumentisdesignedtoprovidebothservicestomeetthecurrentdemandsandaninfrastructure,whichisabletosatisfytherequirementsofthefuture.ThepresentdocumentdescribesthecharacteristicsofanOpticalAccessNetwork(OAN)withthecapabilityoftransportinginteractiveservices,basedon64kbit/sbearercapabilities,betweentheUserNetworkInterface(UNI)andthelocalexchange.ThepresentdocumentconsidersanOANcapableofprovidingbusinessandresidentialcustomerswitharangeofservices(upto2Mbit/s)overapassivesplitopticalnetwork.Distributiveservices(e.g.cabletelevision)areoutsidethescopeofthepresentdocument.TheOANdescribedinthepresentdocumenthasconsideredtherequirementfortheaccessnetworktoadapttothechangingrequirementsofindividualcustomersintermsofcapacity,flexibilityandtypesofservicesofferedwithouttheneedfornetworkoperatorstoprovideservicespecificoverlaynetworks.TheconsideredsystemswithinthepresentdocumentarebasedonTimeDivisionMultipleAccess(TDMA)and/orSubcarrierMultipleAccess(SCMA)methods.Oneandtwofibresystemsaredescribed.ThepresentdocumentconsidersOANswheretheOpticalDistributionNetwork(ODN)isbasedonpoint-to-multipointtreeandbranchoptionsasdescribedinETS300681[4].Thepresentdocumentisnotacompletesystemdefinition.Itidentifiesaspectsthatcanbedefinedwithoutpreventingtransmissioninnovation.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ECSYN287(1990):"Proposalforthecouncildirectiveconcerningtheprotectionofindividualsinrelationtotheprocessingofpersonaldata".[2]ECSYN288(1990):"Proposalforthedirectiveconcerningtheprotectionofpersonaldataandprivacyinthecontextofpublicdigitaltelecommunicationnetworks,inparticulartheintegratedservicesdigitalnetwork(ISDN)andpublicdigitalmobilenetworks".[3]EN60950:"Safetyofinformationtechnologyequipment,includingelectricalbusinessequipment".[4]ETSIETS300681(1996):"TransmissionandMultiplexing(TM);OpticaldistributionnetworkforOpticalAccessNetworks(OANs)".[5]ETSIETS300736:"TransmissionandMultiplexing(TM);OperationandmaintenanceofOpticalAccessNetworks(OANs)".[6]ETSIETR080:"TransmissionandMultiplexing(TM);IntegratedServicesDigitalNetwork(ISDN)basicrateaccess;Digitaltransmissionsystemonmetalliclocallines".[7]ETSIETS300011:"IntegratedServicesDigitalNetwork(ISDN);Primaryrateuser-networkinterface;Layer1specificationandtestprinciples".SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)7[8]ETSIETS300012:"IntegratedServicesDigitalNetwork(ISDN);Basicuser-networkinterface;Layer1specificationandtestprinciples".[9]ETSIETS300019:"EquipmentEngineering(EE);Environmentalconditionsandenvironmentaltestsfortelecommunicationsequipment".[10]ETSIETS300233:"IntegratedServicesDigitalNetwork(ISDN);AccessdigitalsectionforISDNprimaryrate".[11]ETSIETS300288:"BusinessTeleCommunications(BTC);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation".[12]ETSIETS300324:"SignallingProtocolsandSwitching(SPS);VinterfacesatthedigitalLocalExchange(LE);V5.1interfaceforthesupportofAccessNetwork(AN)".[13]ETSIETS300347:"SignallingProtocolsandSwitching(SPS);VinterfacesatthedigitalLocalExchange(LE);V5.2interfaceforthesupportofAccessNetwork(AN)".[14]ETSIEN300376-1:"TelecommunicationsManagementNetwork(TMN);Q3interfaceattheAccessNetwork(AN)forconfigurationmanagementofV5interfacesandassociateduserports;Part1:Q3interfacespecification".[15]ETSIEN300378-1:"TelecommunicationsManagementNetwork(TMN);Q3interfaceattheAccessNetwork(AN)forfaultandperformancemanagementofV5interfacesandassociateduserports;Part1:Q3interfacespecification".[16]ETSIETS300462-2:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part2:Synchronizationnetworkarchitecture".[17]ETSIETS300462-5:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part5:TimingcharacteristicsofslaveclockssuitableforoperationinSynchronousDigitalHierarchy(SDH)equipment".[18]ETSIETS300418:"BusinessTeleCommunications(BTC);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".[19]ITU-TRecommendationG.703:"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[20]ITU-TRecommendationG.704:"Synchronousframestructuresusedat1544,6312,2048,8488and44736kbit/shierarchicallevels".[21]ITU-TRecommendationG.803:"Architecturesoftransportnetworksbasedonthesynchronousdigitalhierarchy(SDH)".[22]ITU-TRecommendationG.823:"Thecontrolofjitterandwanderwithindigitalnetworkswhicharebasedonthe2048kbit/shierarchy".[23]ITU-TRecommendationG.832:"TransportofSDHelementsonPDHnetworks:Frameandmultiplexingstructures".[24]ITU-TRecommendationI.430:"Basicuser-networkinterface-Layer1specification".[25]ITU-TRecommendationM.3010:"Principlesforatelecommunicationsmanagementnetwork".[26]ECITSEC:"InformationTechnologySecurityCriteria(ITSEC)".[27]ETSIEG201212:"ElectricalSafety;Classificationofinterfacesforequipmenttobeconnectedtotelecommunicationnetworks".SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingdefinitionsapply:accesslink:wholeoftransmissionmeansbetweenagivennetworkinterfaceandasingleuserinterface.TheconceptofaccesslinkisusedinordertoallowafunctionalandproceduraldescriptionandadefinitionofthenetworkrequirementsNOTE1:Theuser-sideandthenetwork-sideoftheaccesslinkarenotidenticalandthereforetheaccesslinkisnotsymmetrical.AdaptationUnit(AU):providesadaptationfunctionsbetweentheOpticalNetworkUnit(ONU)andtheuser-sidediplexworking:bi-directionalcommunicationusingadifferentwavelengthforeachdirectionoftransmissionoverasinglefibreduplexworking:bi-directionalcommunicationusingthesamewavelengthforbothdirectionsoftransmissionoverasinglefibreFieldReplaceableUnit(FRU):lowestlevelofmaintenancespareandwilltypicallybeaplug-incard.ThemodulesofanOpticalLineTermination(OLT)andONUshouldbeFRUsfullaccess:givennootherconnections,anyslotononesideoftheconcentratormaybeconnectedtoanyslotontheothersideoftheconcentratormultiplexingstatic:systemofmultiplexingwheretherelationshipbetweenthepositionofthetributariestothemultiplexedformat(channels)ispredeterminedandfixedmultiplexingdynamic:systemofmultiplexingwheretherelationshipbetweenthepositionofthetributariestothemultiplexedformat(channels)isflexible.Italsoallowsfortributariestobeaggregatedwheretherearemoretributariesthanavailablechannelsandthepossibilitytovarythebandwidthtontimesthecapacityofthechannelsnon-blocking:anyallowableconnectionmaybemadeatanytime,regardlessoftheorderinwhichconnectionsareestablishedorremoved(Anallowableconnectionassumesthattherespectiveslotsarefree)OpticalAccessNetwork(OAN):setofaccesslinkssharingthesamenetwork-sideinterfacesandsupportedbyopticalaccesstransmissionsystemsNOTE2:TheOANmayincludeanumberofODNsconnectedtothesameOLT.OpticalDistributionNetwork(ODN):providestheopticaltransmissionmeansfromtheOLTtowardstheusers,andviceversaOpticalLineTermination(OLT):providesthenetwork-sideinterfaceoftheOANandisconnectedtooneormoreODNsOpticalNetworkUnit(ONU):provides(directlyorremotely)theuser-sideinterfaceoftheOANandisconnectedtotheODNopticalfilter:devicefortheselectionofopticalsignalsatopticalspecificwavelengthsopticalpowersplitter:devicethathasninputswithkoutputs,wheren=1tokandk2passivecomponent:componentpartoftheODNthatdoesnotrequireexternalpower,i.e.fibre,splitter,filterpoint-to-multipoint:transmissionsystem,whichcanhaveoneinputoroutputatoneendwithmultipleinputsoroutputsattheotherendPassiveOpticalNetwork(PON):subsetofanODNandreferstoapoint-to-multipointoptionSpaceDivisionMultiplexing(SDM):bi-directionalmultiplexingusingdifferentfibresforupanddownstreamsignalsSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)9SubCarrierMultiplexing(SCM):multiplexingmultipleelectricalfrequenciesontoasinglefibreatasinglewavelengthtoprovideanindividualfrequencytoeachmultipointtopointpathserialnumber:referencenumberassignedtoanobject,component,etc.servicechannel:eachbearerserviceisallocatedaservicechannelinthePONsystems.e.g.a64kbit/schanneltosupportthePublicSwitchedTelephoneNetwork(PSTN)ServiceUnit(SU):FRUthatsupportsserviceinterface(ServiceUnit(SU))function(s)simplexworking:communicationwhichusesadifferentfibreforeachdirectionoftransmissionTimeCompressionMultiplexing(TCM):bi-directionalmultiplexingusingdifferenttimeslotsforupanddownstreamsignalsTimeDivisionMultiplexing(TDM):multiplexinginformationontofixedtimerangesTributaryUnit(TU):FRUwithoneormoretributaryinterfacefunctionsWavelengthDivisionMultiplexing(WDM):bi-directionalmultiplexingusingdifferentopticalwavelengthforupanddownstreamsignals3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ACAlternatingCurrentA/DAnaloguetoDigital(conversion)ANAccessNetworkATMAsynchronousTransferModeAUAdaptationUnitBABasicAccessB-ISDNBroadbandIntegratedServicesDigitalNetworkDCDirectCurrentD/ADigitaltoAnalogue(conversion)D2048S2048kbit/sdigitalstructuredONPleasedlineD2048U2048kbit/sdigitalunstructuredONPleasedlineFDMFrequencyDivisionMultiplexingFITLFibreInTheLoopFRUFieldReplaceableUnitISDNIntegratedServicesDigitalNetworkISDN-BAISDN-BasicAccessITSECInformationTechnologySecurityCriteriaMTBFMeanTimeBetweenFailuresMTTRMeanTimeToRepairNNINetworktoNetworkInterfaceNTNetworkTerminationNT1NetworkTermination1OAMOperationsAdministrationandMaintenanceOANOpticalAccessNetworkODNOpticalDistributionNetworkOLTOpticalLineTerminationONPOpenNetworkProvisionONUOpticalNetworkUnitOSOperationsSystemOSIOpenSystemsInterconnectionOTDROpticalTimeDomainReflectometerPONPassiveOpticalNetworkPOTSPlainOldTelephonyServicesppmpartspermillionPRAPrimaryRateAccessPRCPrimaryReferenceClockPSTNPublicSwitchedTelephoneNetworkSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)10QANQinterfacefortheAccessNetworkSCMSubCarrierMultiplexingSCMASubCarrierMultipleAccessSDHSynchronousDigitalHierarchySDMSpaceDivisionMultiplexingSNIServiceNodeInterfaceSPFSignallingProcessingFunctionSSUSynchronizationSupplyUnitSUServiceUnitTCMTimeCompressionMultiplexingTDMTimeDivisionMultiplexingTDMATimeDivisionMultipleAccessTUTributaryUnitUIppUnitIntervalspeaktopeakUNIUserNetworkInterfaceVCVirtualContainerVFVoiceFrequencyWDMWavelengthDivisionMultiplexing4ConfigurationofanOANTheconfigurationofanOANisconsideredinthisclause.ItprovidesanintroductiontothedetailedrequirementsofanOAN.NOTE:ThefunctionalarchitectureissuesareunderstudyinETSISubTechnicalCommittee(STC)TM3.4.1TopologicalandfunctionalissuesAconfigurationforanOANisshowninfigure1.AnOANconsistsof:a)oneOLT;b)atleastoneODN;c)atleastoneONU;d)AUs.TheODNprovidestheopticaltransmissionmeansfromtheOLTtowardstheusersandviceversa.ONUsprovidetheuser-sideinterfaceoftheOANandareconnectedtotheODN.ThefunctionscomprisedbytheAUincludeadaptationoftheserviceinterfacingbetweenONUanduser(e.g.conversionofdatacommunicationprotocolsandrates)aswellastransportationoftheserviceoverthelastdropbetweentheONUanduserwhentheseinterfacesdonotcoincide(e.g.NetworkTermination1(NT1)forIntegratedServicesDigitalNetwork,BasicAccess(ISDN-BA)).ThereferencepointsUserNetworkInterface(UNI)andServiceNodeInterface(SNI)aswellastheQ3interfaceshowninfigure1.TheRandSreferencepointsaredescribedinETS300681[4].NOTE:StandardizationworkrelatedtosuchanAUisoutsidethescopeofthepresentdocument.SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)11AUAccesslinkUsersideNetworksideONUS/RS/RSNIUNIONUODNOLTANSystemManagementQ3LineFigure1:ExampleconfigurationforanOANAfunctionalarchitectureoftheOANinaccordancewiththeprinciplesofITU-TRecommendationG.803[21]isshowninfigure2.ISDN-BAistheadaptedserviceshowninthisarchitecture.TheServiceNodeInterface(SNI)isaccordingtoV5.1;seeETS300324[12].ThemultiplexingoftheuserindividualD-channelsisperformedonahigherlayerandnotshowninthisstructure.ThestructureofDandD*arenotidentical.Althoughanumberofotheroptionsexist(e.g.leasedlines,V5.2,etc.)theyarenotshownonthisdiagram.SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)12OpticalsectiontrailWavelength1WavelengthnFibreadaptationFibreterminationOpticalterminationE/OAdaptationODNtransmissionprotocolTTPODNtransmissionprotocoltrailPayload/ODNtransmissionprotocoladaptationBCodedringing,hook(+dial)DG.704connection(V5.1)AdaptationsofISDNBAandPOTSintoG.704(forV5.1)G.702terminationAdaptationintoPOTSlinePOTSlineterminationPOTSlineAdaptationintoISDNBAlineISDNBAterminationS/TbusAdaptationterminationS/TbusCopperlineAdaptationtermination(NT1)MediumlayerOpticallayerTransmissionsectionlayerTransmissionpathlayerD*Figure2:ExamplearchitectureconfigurationfortheOANSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)134.2ServicecapabilityTheOANshallbecapableofsupportingthefollowingservices:a)POTS;b)leasedlines;c)packetdata;d)ISDN-BA;e)ISDNPrimaryRateAccess(ISDN-PRA);f)nx64kbit/s;g)2Mbit/s(structuredorunstructured).5ONUTheONUprovidesanopticalinterfacetowardstheODNandimplementstheinterfacesatthecustomersideoftheOAN.ONUsshallbelocatedonthecustomer'spremises(fibretothehome,fibretotheoffice,fibretothebuilding)orinthefieldaspartoftheopticalaccesssection(fibretothekerb).TheONUprovidesthemeansnecessaryfordeliveringthedifferentservicesthataretobehandledbythesystem.5.1DescriptionoffunctionsFigure3showsafunctionaldescriptionoftheONU.ItisusefulforstandardizationpurposestoconsidertheONUintermsofthreeparts,thesearedefinedas:a)coreshell;b)serviceshell;c)commonshell.Thefunctionalityoftheseshellsisdescribedinsubclauses5.1.1to5.1.3.****CommonshellCoreshellServiceshellODNCustomerServiceinterfacefunctionServiceinterfacefunctionCustomerandservicesMultiplexfunctionTransmissionmultiplexfunctionODNinterfacefunctionOAMfunctionPowersupplyfunctionFigure3:ONUfunctionalblocksSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)145.1.1ONUcoreshellTheONUcoreshellincludes:a)ODNinterface;b)transmissionmultiplexing;c)customerandservicemultiplexingfunctions.TheODNinterfacefunctionprovidesasetofopticalphysicalinterfacefunctionsterminatingtherelevantsetofopticalfibresoftheODN,andincludesoptical/electricalandelectrical/opticalconversion.ThetransmissionmultiplexingfunctionprovidesthenecessaryfunctionsforevaluationandallocationoftheincomingandoutgoingsignalsfromandtotheODNInterfaceFunctionextractingandinputtingtheinformationrelevanttothisONU.Thecustomerandservicemultiplexerfunctionassembles/disassemblestheinformationfrom/tothedifferentsubscribersandconnectstheindividualserviceinterfacefunctions.5.1.2ONUserviceshellTheONUserviceshellprovidestheserviceinterfacefunctions.Theserviceinterfacefunctionsprovidethecustomerserviceinterfacesandtheiradaptationinto64kbit/sornx64kbit/s.Thefunctioncanbeprovidedforasinglecustomeroragroupofcustomers.Italsoprovidessignallingconversionfunctionsaccordingtothephysicalinterface(e.g.ringing,signalling,AnaloguetoDigital(A/D)andDigitaltoAnalogue(D/A)conversions).5.1.3ONUcommonshellTheONUcommonshellincludespowersupplyandOperationsAdministrationandMaintenance(OAM)functions.ThepowersupplyfunctionprovidesthepoweringtotheONU(e.g.AlternatingCurrent(AC)toDirectCurrent(DC)orDCtoDCconversion).Powershallbeprovidedlocally(frommains)orremotely.ThepowersupplymaybesharedbyseveralONUs.TheONUshallbecapableofoperatingviaabatteryback-upsource.TheOAMfunctionprovidesthemeanstohandletheOAMfunctionalitytoallblocksoftheONU(e.g.controlofloopbacksinthedifferentblocks).NOTE:Forlocalcontrolaninterfacemaybeprovidedfortestingpurposes.5.2ONUdimensionsTheONUdimensionsconsideredinthissubclauserefertoissuesrelatingtotheservicecapacity.AnONUisdefinedasbeingofaspecifictypeandbelongingtoaspecificclass.Fivetypesandthreeclassesaredescribed.ThetypesaredescribedintermsofnumberofPOTScircuits,whichcanbeprovidedandareshownintable1:Table1:ONUtypedescriptionMaximumnumberofPOTScircuitsthatcanbeequippedTypeI4POTSTypeII12POTSTypeIII30POTSTypeIV60POTSTypeV120POTSSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)15TheclassesofONUaredefinedbythemaximumthroughputrequiredatthecustomersideoftheONU.ThisisdefinedintermsoftheusableBchannels(whereBisa64kbit/sbearerchannel).Controlandsignallingchannelsarenotgenerallyincludedexceptwherecarriedwithinthebearerchannels(e.g.ISDNPrimaryRateAccess(ISDNPRA)).Threeclassesaredefinedasshownintable2:Table2:ONUClassdescriptionMaximumnumberofBchannelsClass14BClass232BClass364BONUtypesandclassesaboveandbelowthevaluesdescribedintables1and2havenotbeendefinedandareforfurtherstudy.ItshallbepossibletoreallocateunusedBchannelsfromoneONUtoanyotherONUuptotheirmaximumcapacity.Forexample:aclass3ONUhasamaximumthroughputof64B.Ifonly30POTSlinesarerequiredthen34BcanbereallocatedtootherONUs.ItshallbepossibletomixdifferentONUtypesandclassesonthesameODN.TherelationshipsbetweentypesandclassesaredescribedinannexA.Tocalculatetheaboveservicecapacitiesthefollowingequivalentsshallbeused:1x64kbit/s:=1analoguetelephoneaccess(POTS);=1analoguecustomeraccessforfixedconnections(leasedline);=1digitalcustomeraccessforfixedconnections64kbit/s(leasedline);=1dataaccess<64kbit/s;=1/2ISDN-BA;=1/32ISDN-PRA;=1/32digitalcustomeraccessforfixedconnections1984Mbit/s(leasedline);=1/32digitalcustomeraccessforfixedconnections2048Mbit/s(unstructuredleasedline).TheSUsoftheONUsasanexamplemaybeequippedasfollows:2analoguetelephoneaccesses(POTS)percard;2analoguefixedaccesses(leasedlines)percard;2digitalfixedaccesses64kbit/s(leasedlines)percard;1ISDN-BA(Tinterface)percard;1ISDN-BA(Lineinterface)percard;1ISDN-PRApercardand1digitalfixedaccess2Mbit/s(leasedline)percard.5.3UsertoNetworkInterfaces(UNIs)ThenarrowbandISDNandPOTSinterfaceshavebeenidentifiedandtheexistingUNIsshallbeused:analoguetelephonyservices:national;analogueleasedlineservices:national;ISDN-BA:ETS300012[8]:forISDNBA,thisalsocouldbealineinterface,wheretheNTisconnectedtotheONUusingatransmissionsystemaccordingtoETR080[6];ISDN-PRA:ETS300011[7];circuitswitchedandpacketdataservices:thecustomerinterfacefordataservicesshouldbe64kbit/saccordingtoITU-TRecommendationG.703[19];or2Mbit/saccordingtoITU-TRecommendationsG.703[19]andG.704[20].SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)16NOTE1:TheconversiontotheappropriatedatanetworkinterfacemaybeprovidedbyanAU,whichisnotpartoftheOAN.IncasetheONUisnotlocatedatthecustomers'premises,anAUaspartoftheOANisalsoneededtofacilitatethetransportofthis64kbit/sbearerchannelmadeavailableattheinterfaceoftheSUconcerned.digitalleasedlineservices:64kbit/sITU-TRecommendationG.703[19]:64kbit/sITU-TRecommendationI.430[24]:1984kbit/s:2048kbit/s:nx64kbit/s(n<30):ETS300288[11];similartoETS300012[8];ETS300418[18](D2048S);ETS300418[18](D2048U);ETS300418[18](D2048U).Fortheunstructured2048Mbit/s:InthecasewhenaSynchronousDigitalHierarchyVirtualContainer12(SDHVC12)pathisusedthisshallbeterminatedintheONU.Ajustificationmechanismhastobeusedtoprovidethepossibilityofthirdpartytiming.NOTE2:ThetransportoftheSDHVC12andtherelatedtimingdoesnotrequirestandardization.AmethodsimilartotheITU-TRecommendationG.832[23]canbeusedin2048Mbit/sorientednetworks.AnotherpossibilityisthetransportofthecompleteSDHTU12includingpointersinanOANprovidingaflexibletransmissionframe.5.4ONUpowerconsiderationsForeachONUtypetheminimum,maximumandtypicalpowerrequirementsandtheconditionsusedtocalculatethemshallbeprovided.Thespecificpoweringrequirementsofthedifferentinterfaces(asdefinedinsubclause5.3)shallbeconsidered.Powerusedforbatterychargingshouldnotbeincludedinthecorepowerconsumptionvalues;however,thispowerparametershallbeprovided.Theloopresistanceuptothenetworkterminationpointisdependantonthenationalimplementation,300Ωshouldbeusedforcalculationpurposes.ThepoweringrequirementscalculationforanONUshalltakeintoaccounttheenvironmentalclassdescribedinETS300019[9].AdetaileddescriptionofthepoweringaspectsofONUsandexamplesofpowerconsumptionvaluesareshowninannexB.6ODNThedetailedspecificationoftheODNisconsideredinETS300681[4].6.1GeneralODNrequirementsTheODNisbasedonpoint-to-multipointtreeandbranchoptionsasdescribedinETS300681[4].TheODNincludesnoopticaltoelectricalconversion.ODNopticalelementsmaybeco-locatedwiththeONUand/orOLT.TheODNshallsupportoperationinthesecondandthirdwavelengthregionsasdescribedinETS300681[4].SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)176.2ReachlimitationsandsplitratiosoftheODNInthissubclausealldistancesquotedrefertofibrekilometres.TheOANsystemshallbeabletooperateoveradistanceupto20km.TwoOANsystemtypesaredescribedwhicharebasedonthetransmissionmethodsconsideredinclause8.OANsystemstype2haverestrictedODNrequirementse.g.TimeCompressionMultiplexing(TCM).Atthegivendistancesintable3thesplitratiosshownarerequired.Table3:OANsystemtypesDistanceOANsystemtype1(e.g.SDM,WDM,FDM)OANsystemtype2(e.g.TCM)20kmAsplitratioofatleast16wayshallbesupportedAsplitratioofatleast8wayshallbesupported10kmAsplitratioofatleast32wayshallbesupportedAsplitratioofatleast16wayshallbesupportedSDM:SpaceDivisionMultiplexingWDM:WavelengthDivisionMultiplexingFDM:FrequencyDivisionMultiplexingThepathlossesfortheaboverequirementsarecalculatedinETS300681[4].ThereisanOANsystemrequirementtooperatewithadifferentialfibredistance(∆)betweenthenearestandfurthestONUfromtheOLTasdefinedinfigure4.OLTONU1ONUnx1x2x1:ShortestdistancebetweenOLTandONUofanODN.x2:LongestdistancebetweenOLTandONUofanODN.Figure4:ReachlimitationsofPONsThedifferentialfibredistance(∆)=x2-x1TheOANsystemshallbecapableofoperatingoveranODNsuchthatthedifferentialfibredistance(∆)betweenthenearestandfurthestONUfromtheOLTisanywherebetween0kmandatleast5km.NOTE:IftheOANsystemwillnotprovideservicetoONUswhenthedistancebetweenthenearestandfurthestONUfromtheOLTis4,5kmthenthesystemdoesnotmeetthisrequirement.HoweveriftheOANsystemwillprovideservicetoONUswhenthedistancebetweentheOLTandthenearestandfurthestONUis5,1km,10kmor20km(i.e.greaterthanorequalto5km)thenthesystemmeetstherequirement).7OLTTheOLTprovidesatleastoneopticalinterfacetowardstheODNandprovidesatleastonenetworkinterfaceonthenetwork-sideoftheOAN.TheOLTcanbeco-locatedwithinalocalexchangeorataremotelocation.ItcomprisesthemeansnecessaryfordeliveringdifferentservicestotherequiredONUs.SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)187.1DescriptionoffunctionsFigure5showsafunctionaldescriptionoftheOLT.ItisusefulforstandardizationpurposestoconsidertheOLTintermsofthreeparts,thesearedefinedas:a)coreshell;b)serviceshell;c)commonshell.Thefunctionalityoftheseshellsisdescribedinsubclauses7.1.1to7.1.3.ODN***NetworkCoreshellCommonshellServiceshellSPF***ODNinterfacefunctionTransmissionmultiplexfunctionTributaryinterfacefunctionDigitalcrossconnectfunctionOAMfunctionPowersupplyfunctionTributaryinterfacefunctionODNinterfacefunctionTomediationfunctionandthenQ3interfaceSPF:SignallingProcessingFunctionFigure5:OLTfunctionalblocks7.1.1OLTcoreshellTheOLTcoreshellincludes:a)ODNinterface;b)transmissionmultiplexing;c)customerandservicecrossconnectfunctions.TheODNinterfacefunctionprovidesasetofphysicalopticalinterfacefunctionsterminatingtherelevantset(s)ofopticalfibresoftheODN(s),andincludesoptical/electricalandelectrical/opticalconversion.InordertoenableimplementationofprotectionswitchingbetweengeographicallyredundantroutesuptoaflexibilitypointintheODNwhereopticalfibresplittingoccurs,theOANsystemshouldprovidethepossibilityofoptionallyequippingtheOLTwithaduplicateODNinterface.ThisisinadditiontothemaximumnumberofODNsthattheOLTisdesignedfornormaloperation.Detailedcharacteristicsofpossibleprotectionmechanismsarenotconsideredinthepresentdocument.SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)19ThetransmissionmultiplexingfunctionprovidesthenecessaryfunctionsfortransmittingorreceivingservicechannelsovertheODN.ThecustomerandservicecrossconnectfunctionprovidesconnectivitybetweentheavailablebandwidthattheODNsideandthenetworkpartsatthenetwork-side.Fullaccessshallbeprovided.7.1.2OLTserviceshellTheOLTserviceshellcanincludeNTinterfaceandsignalprocessingfunctions.ATUisanFRUwithoneormoretributaryinterfacefunctions.Anetworktributaryinterfacefunctionisa2Mbit/sport(describedinsubclause7.3)onaTU;itprovidestheinterfacebetweentheOLTandthemainnetwork.Theyshallbespecifictoasingleservice,configurabletooneofanumberofservices,orcapableofsimultaneouslysupportingtwoormoredifferentservices.AnyTUthatprovidestwoormore2Mbit/sportsshallbeindependentlyconfigurableonaperportbasis.Forthistypeofmulti-portTU,itshallbepossibletoconfigureeachporttoadifferentservice.EachTUpositionintheOLTequipmentshallbecapableofacceptingaTUofanytype.TheOLTshallbeabletosupportanynumberofTUsuptothedesignedmaximumnumberinanycombinationofservices.ThesignalprocessingfunctionsprovidethemeansforhandlingsignallinginformationthroughtheOLT.7.1.3OLTcommonshellTheOLTcommonshellcanincludepowersupplyandOAMfunctions.Thepowersupplyfunctionconvertsanexternalpowersourcetotherequiredlevel.TheOAMfunctionprovidesthemeanstohandletheOAMfunctionalitytoallblocksoftheOLT.ItalsoprovidesaninterfacefunctionbothforlocalcontrolfortestingpurposesandfortheQinterfacefortheAccessNetwork(QAN)interfacetowardstheOperationsSystem(OS)viaamediationfunction.7.2OLTdimensionsTheOLTdimensionsconsideredinthissubclauserefertoissuesrelatingtotheservicecapacity.TheOLTdimensionsaredescribedintable4.TwoOANsystemtypesaredescribedwhicharebasedonthetransmissionmethodsconsideredinclause8.OANsystemstype2haverestrictedODNrequirementse.g.TCM.Table4:OLTdimensionsReferenceOANsystemtype1(e.g.SDM,WDM,FDM)OANsystemtype2(e.g.TCM)Numberoftributaryinterfacefunctionsatleast32atleast32NumberofODNInterfacesatleast4atleast4TotalOLTcross-connectfunctioncapabilityatleast800Batleast800BODNinterfacecapacityatleast200Batleast100BSIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)207.3SNIsTheSNIsusedshouldbeasdescribedintable5.Table5POTS:V5.1(ETS300324[12])/V5.2(ETS300347[13])ISDN-BA:V5.1(ETS300324[12])/V5.2(ETS300347[13])ISDN-PRA:V3(ETS300233[10])ISDN-PRA(subfilled):V5.2(ETS300347[13])Dataservices:2Mbit/saccordingtoG.703[19]andG.704[20]Analogueleasedlines:withinbandsignalling:withoutbandsignalling:2Mbit/saccordingtoG.703[19]andG.704[20]2Mbit/saccordingtoG.703[19]andG.704[20]plusnationalsignallingDigitalleasedlineservices:64kbit/sG.703[19]:64kbit/sI.430[24]:1984kbit/s:2048kbit/sunstructured:2Mbit/saccordingtoG.703[19]andG.704[20]2Mbit/saccordingtoG.703[19]andG.704[20]2Mbit/saccordingtoG.703[19]andG.704[20]2Mbit/saccordingtoG.703[19]andG.704[20]2Mbit/saccordingtoG.703[19]G.703[19]:ITU-TRecommendationG.703[19].G.704[20]:ITU-TRecommendationG.704[20].I.430[24]:ITU-TRecommendationI.430[24].ThereisapossibilitythattheseinterfacescouldbemappedontoSDHtransportmechanismasanalternativemethod.8SpecificattributesofOANsInthisclausethekeyfeaturesofOANstomeettherequirementsofthenetworkoperatorsaredescribed.8.1TransmissionmethodThetransmissionmethodshallallowtheOLT-ONUconnectiontobepoint-to-multipoint.Thetransmissionmethodshallalsoallowpoint-to-pointinterworkingbetweentheOLTandtheONU,however,thisshouldbeconsideredasasubsetofthetransmissionmechanismcapabilities.Specificoptimizedpoint-to-pointsystemsareoutsidethescopeofthepresentdocument.ThemultipleaccessmethodshallbebasedontheTDMAand/orSCMAtransmissionmethod.Thebi-directionaltransmissionschemeshallbebasedononeofthefollowingprocedures:-SDM(2fibres,simplex);-TCM(1fibre,half-duplex);-WDM(1fibre,diplex);-FDM(1fibre,duplex).8.2OperatingwavelengthrangeforanOANTheoperatingwavelengthrangedescribedinthissubclausereferstothesystemwavelengthforprovidingnarrowbandservices.ItispossiblethatwavelengthsoutsidetheseregionsmaybesimultaneouslypresentonthesameODN(e.g.fortestingpurposes),thesecouldbeconsideredasinterferingsignals.TheOANshouldcontinuetooperatenormallyinthepresenceofinterferingsignals.Itisimportanttoconsidertheoperatingwavelengthrangeintwodirections,asthepossibleuseofwavelengthmaybedifferentineachdirection.SIST EN 300 463 V1.1.2:2003

ETSIETSIEN300463V1.1.2(2000-06)218.2.1SDMTheoperatingwavelengthrangeshallbewithinthe1310nmregionasdefinedinETS300681[4].8.2.2TCMTheoperatingwavelengthrangeshallbewithinthe1310nmregionasdefinedinETS300681[4].8.2.3WDMTheoperatingwavelengthrangeshallbewithinthe1310nmregionasdefinedinETS300681[4].Asaninterimsolution,duetoeconomicalandtechnicalissues,theoperatingwavelengthrangefordownstreamdirection(OLTtoONU)couldbewithinthe1550nmregionasdefinedinETS300681[4].8.2.4FDMTheoperatingwavelengthrangeshallbewithinthe1310nmregionasdefinedinETS300681[4].8.3SignaltransferdelayThefiguresbelowdefinethemeansignaltransferdelayastheaverageoftheupstreamandthedownstreamvalues.Themeansignaltransferdelaytimeisthemeasuredroundtripdelaytimedividedbytwo,asshowninfigure6.Allthedefinedvaluesassumea10kmdistanceoftheODN.Thelengthofthemetallicdropshallbeneglected.ONUSUOLTTUAUSplitterUNISNIDelayupstreamDelaydownstreamRoundtripmeansignaltransferdelaydelaydownstreamdelayupstream=+2Figure6:SignaltransferdelaycalculationsSIST EN 300
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