TRECG975102IMSWE.docx
《TRECG975102IMSWE.docx》由会员分享，可在线阅读，更多相关《TRECG975102IMSWE.docx（63页珍藏版）》请在冰豆网上搜索。
TRECG975102IMSWE
INTERNATIONALTELECOMMUNICATIONUNION
ITU-T
G.975.1
TELECOMMUNICATION
STANDARDIZATIONSECTOR
OFITU
（02/2004）
SERIESG:
TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKS
Digitalsectionsanddigitallinesystem –Opticalfibresubmarinecablesystems
Forwarderrorcorrectionforhighbit-rateDWDMsubmarinesystems
ITUTRecommendationG.975.1
ITU-TG-SERIESRECOMMENDATIONS
TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKS
INTERNATIONALTELEPHONECONNECTIONSANDCIRCUITS
G.100–G.199
GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-TRANSMISSIONSYSTEMS
G.200–G.299
INDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONMETALLICLINES
G.300–G.399
GENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINES
G.400–G.449
COORDINATIONOFRADIOTELEPHONYANDLINETELEPHONY
G.450–G.499
TESTINGEQUIPMENTS
G.500–G.599
TRANSMISSIONMEDIACHARACTERISTICS
G.600–G.699
DIGITALTERMINALEQUIPMENTS
G.700–G.799
DIGITALNETWORKS
G.800–G.899
DIGITALSECTIONSANDDIGITALLINESYSTEM
G.900–G.999
General
G.900–G.909
Parametersforopticalfibrecablesystems
G.910–G.919
Digitalsectionsathierarchicalbitratesbasedonabitrateof2048kbit/s
G.920–G.929
Digitallinetransmissionsystemsoncableatnon-hierarchicalbitrates
G.930–G.939
DigitallinesystemsprovidedbyFDMtransmissionbearers
G.940–G.949
Digitallinesystems
G.950–G.959
DigitalsectionanddigitaltransmissionsystemsforcustomeraccesstoISDN
G.960–G.969
Opticalfibresubmarinecablesystems
G.970–G.979
Opticallinesystemsforlocalandaccessnetworks
G.980–G.989
Accessnetworks
G.990–G.999
QUALITYOFSERVICEANDPERFORMANCE-GENERICANDUSER-RELATEDASPECTS
G.1000–G.1999
TRANSMISSIONMEDIACHARACTERISTICS
G.6000–G.6999
DIGITALTERMINALEQUIPMENTS
G.7000–G.7999
DIGITALNETWORKS
G.8000–G.8999
Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.
ITU-TRecommendationG.975.1
Forwarderrorcorrectionforhighbit-rateDWDM
submarinesystems
Summary
ThisRecommendationdescribestheForwardErrorCorrection（FEC）functionsthathavehighercorrectionabilitythanRS（255,239）codedefinedinITU-TRec.G.975forthehighbit-rateDWDMsubmarinecablesystems.InAppendixI,superFECschemes,whichhavehigher-correctionabilitythanRS（255,239）code,arealsodescribed.TheuseofthissuperFECfunctioninsubmarineterminaltransmissionequipments（TTEs）shouldnotbeconsideredasmandatory.
Source
ITUTRecommendationG.975.1wasapprovedon22 February 2004byITUTStudyGroup 15（20012004）undertheITUTRecommendation A.8procedure.
FOREWORD
TheInternationalTelecommunicationUnion（ITU）istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector（ITU-T）isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.
TheWorldTelecommunicationStandardizationAssembly（WTSA）,whichmeetseveryfouryears,establishesthetopicsforstudybytheITUTstudygroupswhich,inturn,produceRecommendationsonthesetopics.
TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution 1.
InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.
NOTE
InthisRecommendation,theexpression"Administration"isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.
CompliancewiththisRecommendationisvoluntary.However,theRecommendationmaycontaincertainmandatoryprovisions（toensuree.g.interoperabilityorapplicability）andcompliancewiththeRecommendationisachievedwhenallofthesemandatoryprovisionsaremet.Thewords"shall"orsomeotherobligatorylanguagesuchas"must"andthenegativeequivalentsareusedtoexpressrequirements.TheuseofsuchwordsdoesnotsuggestthatcompliancewiththeRecommendationisrequiredofanyparty.
INTELLECTUALPROPERTYRIGHTS
ITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.
AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.
ITU2005
Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.
CONTENTS
Page
1Scope1
2References1
3Termsanddefinitions2
3.1TermsdefinedinotherRecommendations2
3.2Definitions2
4Abbreviations3
5SuperFECfeatures3
5.1GeneralprinciplesofsuperFECfunction3
5.2SuperFECscheme4
6DefinitionofsuperFECfunction4
6.1Definition4
6.2SuperFECcodealgorithm5
6.3PropertiesforsuperFECcode5
6.4SuperFECframestructure5
7ParametersforsuperFEC5
7.1Correctionability5
7.2Redundancyratio7
7.3Latency7
8Supervision7
8.1Signalqualitysupervision7
8.2Connectivitysupervision7
AppendixI–SuperFECschemes7
I.1Overview7
I.2RS（255,239）/CSOC（n0/k0=7/6,J=8）superFECcode8
I.3ConcatenatedBCHsuperFECcodes13
I.4RS（1023,1007）/BCH（2047,1952）superFECcode19
I.5ConcatenatedRSandproductcodesuper-FECscheme22
I.6LDPCsuperFECcode24
I.7TwoorthogonallyconcatenatedBCHsuperFECcode28
I.8Reed-Solomon（2720,2550）superFECcode41
I.9TwointerleavedextendedBCH（1020,988）superFECcode45
ITU-TRecommendationG.975.1
Forwarderrorcorrectionforhighbit-rateDWDM
submarinesystems
1Scope
ThisRecommendationdescribestheForwardErrorCorrection（FEC）functionsthathavehighercorrectionabilitythanRS（255,239）codedefinedinITU-TRec.G.975intheopticalfibresubmarinecablesystems.ThisRecommendationalsodescribesthesystemrequirementconcerningsupervisionforthesubmarinecablesystems.TheapplicationsbeingaddressedinthisRecommendationarebothopticallyamplifiedrepeateredsystems（ITU-TRec.G.977）andrepeaterlessopticalsystems（ITU-TRec.G.973）.TheuseofthisFECfunctioninsubmarineterminaltransmissionequipments（TTEs）shouldnotbeconsideredasmandatory.
ItisnottheintentionofthisRecommendationtopursuethetransversecompatibilityofthesystem.Therefore,theselectionoftheFECframestructuresdescribedinthisRecommendationisamatterofjointengineering.
ThetransmissionsignalunderconsiderationcouldbeSTM-16,STM-64,STM-256,ODU1,ODU2,andODU3,becausesubmarinesystemscouldbeconsideredasoneoftheIaDIapplicationsdefinedinITU-TRec.G.872.Thisdoesnotmeanthatthebitrateisrestrictedwithintheabove-mentionedsignals.
2References
ThefollowingITU-TRecommendationsandotherreferencescontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthisRecommendation.Atthetimeofpublication,theeditionsindicatedwerevalid.AllRecommendationsandotherreferencesaresubjecttorevision;usersofthisRecommendationarethereforeencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionoftheRecommendationsandotherreferenceslistedbelow.AlistofthecurrentlyvalidITU-TRecommendationsisregularlypublished.ThereferencetoadocumentwithinthisRecommendationdoesnotgiveit,asastand-alonedocument,thestatusofaRecommendation.
–ITU-TRecommendationG.691（2003）,Opticalinterfacesforsingle-channelSTM-64andotherSDHsystemswithopticalamplifiers.
–ITU-TRecommendationG.693（2003）,Opticalinterfacesforintra-officesystems.
–ITU-TRecommendationG.707/Y.1322（2003）,Networknodeinterfaceforthesynchronousdigitalhierarchy（SDH）.
–ITU-TRecommendationG.709/Y.1331（2003）,InterfacesfortheOpticalTransportNetwork （OTN）.
–ITU-TRecommendationG.798（2002）,Characteristicsofopticaltransportnetworkhierarchyequipmentfunctionalblocks.
–ITU-TRecommendationG.805（2000）,Genericfunctionalarchitectureoftransportnetworks.
–ITU-TRecommendationG.872（2001）,Architectureofopticaltransportnetworks.
–ITU-TRecommendationG.957（1999）,Opticalinterfacesforequipmentsandsystemsrelatingtothesynchronousdigitalhierarchy.
–ITU-TRecommendationG.959.1（2003）,Opticaltransportnetworkphysicallayerinterfaces.
–ITU-TRecommendationG.972（2000）,Definitionoftermsrelevanttoopticalfibresubmarinecablesystems.
–ITU-TRecommendationG.973（2003）,Characteristicsofrepeaterlessopticalfibresubmarinecablesystems.
–ITU-TRecommendationG.975（2000）,Forwarderrorcorrectionforsubmarinesystems.
–ITU-TRecommendationG.977（2000）,Characteristicsofopticallyamplifiedopticalfibresubmarinecablesystems.
–IEEEStandard802.3-2002,InformationTechnology–TelecommunicationandInformationExchangebetweenSystems–LAN/MAN–SpecificRequirements–Part3:
Carriersensemultipleaccesswithcollisiondetection（CSMA/CD）accessmethodandphysicallayerspecifications.
3Termsanddefinitions
3.1TermsdefinedinotherRecommendations
ThisRecommen
升级会员 