ITU-T L.72 (01 2008) (英) Databases for optical acc

InternationalTelecommunicationUnionITU-TL.72TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(01/2008)SERIESL:CONSTRUCTION,INSTALLATIONANDPROTECTIONOFCABLESANDOTHERELEMENTSOFOUTSIDEPLANTDatabasesforopticalaccessnetworkinfrastructureITU-TRecommendationL.72ITU-TRec.L.72(01/2008)iITU-TRecommendationL.72DatabasesforopticalaccessnetworkinfrastructureSummaryITU-TRecommendationL.72dealswiththeconfigurationandfunctionsofdatabasesfortheopticalaccessnetworkinfrastructuretobeusedinthedesign,maintenance,operationandadministrationofopticalaccessnetworks.SourceITU-TRecommendationL.72wasapprovedon8January2008byITU-TStudyGroup6(2005-2008)undertheITU-TRecommendationA.8procedure.iiITU-TRec.L.72(01/2008)FOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications,informationandcommunicationtechnologies(ICTs).TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution1.InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.CompliancewiththisRecommendationisvoluntary.However,theRecommendationmaycontaincertainmandatoryprovisions(toensuree.g.interoperabilityorapplicability)andcompliancewiththeRecommendationisachievedwhenallofthesemandatoryprovisionsaremet.Thewordsshallorsomeotherobligatorylanguagesuchasmustandthenegativeequivalentsareusedtoexpressrequirements.TheuseofsuchwordsdoesnotsuggestthatcompliancewiththeRecommendationisrequiredofanyparty.INTELLECTUALPROPERTYRIGHTSITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementersarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabaseat©ITU2008Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.ITU-TRec.L.72(01/2008)iiiCONTENTSPage1Scope............................................................................................................................12References.....................................................................................................................13Termsanddefinitions...................................................................................................14Abbreviationsandacronyms........................................................................................25Databaseconfiguration.................................................................................................26Databasefunctions........................................................................................................26.1Basicfunctions...............................................................................................36.2Reliability.......................................................................................................36.3Extension........................................................................................................46.4Security...........................................................................................................46.5Compatibility..................................................................................................4AppendixI–Japaneseexperience...........................................................................................5I.1Databasestructure..........................................................................................5I.2Whenusingapassiveopticalnetwork(PON)system....................................6I.3Whenbranchingopticalfibrecable................................................................8ivITU-TRec.L.72(01/2008)IntroductionProgressoncommunicationtechnologieshasledtotheactivedevelopmentofmanykindsofbroadbandservicesuchasvoice,dataandvideocommunicationusingaccessnetworks.Itisimportanttorealizehigh-speedbroadbandnetworkstoprovidesuchserviceseconomically.Inordertoprovidetheseservicesinatimelyway,wemustconstructopticalaccessnetworks.Inaddition,therewillbeahugeexpansionoftheopticalaccess