comparing the docsis® 3.1 and hfc evolution to the ftth revolution

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  • COMPARINGTHEDOCSIS3.1ANDHFCEVOLUTIONTOTHEFTTHREVOLUTION

    BY:MICHAELEMMENDORFER

    ATECHNICALPAPERPREPAREDFORTHESOCIETYOFCABLETELECOMMUNICATIONSENGINEERS

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 2

    TABLEOFCONTENTSINTRODUCTION..............................................................................................4WIRELINENETWORKOVERVIEW...................................................................4FibertotheNode(FTTN)withTwistedPairCopperxDSL/G.fast.................................6

    VDSL2Solution................................................................................................................6

    G.fastSolution.................................................................................................................7

    CoaxtotheHome(CTTH)usingHFCandDOCSIS...........................................................8

    OverviewofPONTermsandTechnologies...................................................................10

    FSAN/ITUTGPONFamily.........................................................................................11

    IEEEEPONFamily......................................................................................................12

    SCTEIPS910RFoG(RFoverGlass)............................................................................13

    HybridPassiveOpticalNetwork(HPON)..................................................................15

    TELCOWIRELINEACCESSNETWORKEVOLUTION........................................17AT&TUverseFibertotheNodewithVDSL2andPreexistingCopperAnalysis.........18

    VerizonFiOSFibertotheHome(FTTH)withGPON...................................................19

    TelcoNetworkInvestmentComparison.......................................................................21

    CABLEWIRELINEACCESSNETWORKEVOLUTION........................................23CableOperatorNetworkMigrationOptions................................................................24

    OverviewoftheCableMigrationUsesCases...............................................................24

    UseCase1:TodaysExistingNetwork,SpectrumSplit,530HHPNodeandthenAdd2.4GbpsofIP/DOCSISCapacity....................................................................................26

    UseCase2:SpectrumUpgrade1GHz/85MHzmovefrom530to265HHPNodeandAdd2.4GbpsofIP/DOCSISCapacityperNode............................................................27

    UseCase3:FTTHusingHPONSpectrum1GHz/85MHzplusDOCSISwith265HHPServingGroupsharing2.4Gbps....................................................................................28

    UseCase4:FTTHusingHPONenablingLegacyVideoand10GEPONSymmetricalforAllIPbasedServices......................................................................................................30

    UseCase5:FTTHusing10GEPONSymmetricalforAllIPbasedServicesincludingFullIPTVDeployment..........................................................................................................31

    FiberToTheTapSystemswithExtendedSpectrumHFCSystemusingHPON...........32

    CableOperatorPossibleUseCaseInvestmentComparisons.......................................33

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 3

    DATACAPACITYCOMPARISONS....................................................................35CONCLUSIONSANDRECOMMENDATIONS...................................................36DISCLAIMER.................................................................................................38TECHNICALACKNOWLEDGEMENTS.............................................................38ABBREVIATIONS...........................................................................................39

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 4

    INTRODUCTIONQuestionsoftenaskedbycableoperatorsworldwidesurroundstheunderstandingoftheaccessnetworkevolutionfromcoaxtothehome(CTTH)tofibertothehome(FTTH).ThoughmanyMSOshaveconcludedthatnewbuildmarkets,whereCTTHdoesnotexist,willlikelyuseFTTHandeventuallyover10GEthernetpassiveopticalnetwork(EPON)technology.Thecorepurposeofthispaperistodiscusstheleastunderstoodtechnology,whichisthelongtermbestpathfortheexistingHFCaccessnetwork.Manycableoperatorsareasking,isthecontinuedinvestmentintheexistingHFCandDOCSISnetwork,movingtosmallernodesandservicegroups,andpossiblyincreasingspectrumallocation,abetterchoicethanjustmovingtoFTTHandpassiveopticalnetwork(PON)technology?SomeMSOsarewonderingifanevolutionaryapproachisbest,whichmayincludedeployingfiberdeeperwithHFCandsmallernodesleveragingthecoaxtothehomeandthenmigratingtoFTTHonanasneededbasis.Alternatively,theyarewonderingifarevolutionaryapproachisbest,whichmayincludestoppingtheinvestmentinHFCandDOCSIS3.1anddirectlymovingtofibertothehomeandPON.

    Thispaperwillfocuscompletelyontheexistingnetworkmigrationoptionsandnotnewbuildorthemultipledwellingunit(MDU)marketsegments.Thepaperexaminesseveraldifferentmigrationpathsfortheexistingcoaxtothehome(CTTH)networksupportingmoreIP/datacapacitywithDOCSIS3.0/3.1overHFC.ThispaperwilldefineseveraldifferentmigrationoptionsforFTTHusing10GEPONandhybridpassiveopticalnetwork(HPON)aradiofrequencyoverglass(RFoG)typeofsolutionthatisfreefromopticalbeatinterference.Thepaperwillexaminethetechnologiestocomparetheeconomicsofthedifferentmigrationoptions.Thepaperwillexaminethetwocoreeconomiccategoriesenablementcapitalandsuccesscapitalforthecomparativestudy.

    WIRELINENETWORKOVERVIEWThissectionprovidesanoverviewoftheaccesstechnologiesusedinthewirelinenetworkspace.Theauthorencouragesthereaderstogatheradditionalmaterialsfromindustrypublicationsandsystemsuppliersregardingthecurrentcapabilitiesofthesetechnologiesandsystems.Thenetworkaccesslayertechnologiesinthissectionaredeployedorunderconsiderationbyserviceprovidersworldwide.Thefigurebelowillustratesatahighlevelthenextgenerationwirelinebroadbandnetworks.

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 5

    Figure1NextGenerationWirelineBroadbandNetworks

    NetworkTechnologyOverview

    FTTN(FibertotheNode/Neighborhood)o Fiberisdeployedtotheneighborhoodoutdoortelcocabinetshousing

    VDSL2Terminalso LeveragescoppertelephonetwistedpairlinesusingVDSL2andinthe

    futureG.fasto Capacity/speedofVDSL2variesondistancefromtheNode/Cabinetand

    Homeo FTTN+VDSL2isapointtopoint(P2P)technologytoVDSL2terminaland

    thensharedtraffico VDSL2andG.fastshouldhavebackwardcompatibility

    HFC(HybridFiberCoax)o DataServicesUsesTechnologiesdefinedbyCableLabso DOCSIS1.0(DataOverCableSystemInterfaceSpecification)wasreleased

    in1997o DOCSIShasreleasefive(5)specificationenhancementsallwithbackward

    compatibilityo DOCSIS3.1offersmultipleGbpsdataratescapacity/speedvariesbased

    onspectrumallocation FTTH(FibertotheHome)

    Telephone Inter Exchange (IXC)

    Video Programing Na onal / Local

    Internet / Private Peering

    Node / Cabinet

    FTTN FibertotheNode

    HFC Hybrid Fiber Coax

    FTTH FibertotheHome

    Fiber

    Copper Coaxial Cable

    Fiber

    Node

    Fiber

    xDSL or G.fast DOCSIS

    GPON or EPON

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 6

    o Capacity/speedvariesontechnologyselectedo FTTHusemanydifferenttechnologies(IEEEEPON,ITUTGPON,IEEE

    Ethernet,RFoG,HPON)o Significantupfrontcapitalremainsachallengeo Highestcostmetrics:CostperHHP,Costtoconnecthomes,andcostper

    subscriberservedo LowestOperationalcostsduetoallpassivenetworkandlowestcostper

    bitremaincompelling

    FibertotheNode(FTTN)withTwistedPairCopperxDSL/G.fastCoppertwistedpairisusedfordata,voiceandvideoservicesintheaccessnetwork.Itisthemostwidelydeployeddeliverymechanismoftheseservicesfortelephoneoperatorsandworldwidemarket[PTGB].Theuseoftwistedpairallowstelephoneoperatorstoleverageexistingcopperlinestothehome.Theuseoftwistedpairhasdistancelimitationoftheselectedtechnology.Themaindriverfortheuseoftwistedpairistheeconomicvalueofexistingwiringcurrentlyinstalledtomosteveryhome.TheuseoftwistedpairhasmanydependenciesindeterminingtheviabilityforvideoservicesandveryhighbitrateInternetservices.DistanceorlengthofthecopperpairstothexDSLterminalisthesinglebiggestdeterminingfactorforcapacity.ToincreasethecapacityoftheexistingtwistedpairnetworkTelcosextendfibertothenode/cabinet,placethexDSLterminaldevicewithin3,000feet,andifnecessarydeploymorefibertoreducethisdistancetoincreasecapacity.ReducingthedistancebetweenthexDSLterminalandthesubscriberwillincreasethespectrumtobeused.ForextensivedetailsandhistoryofthedatatechnologiesovertwistedpairpleaserefertopaperbyThomasCloonan[CLOO].

    VDSL2SolutionThetelecommunicationsindustryhasinvestedresourcesinthedevelopmentofmanystandardsutilizingtwistedpairoverthelasttwodecades.TheInternationalTelecommunicationUnion(ITU),specificallytheITUT,hasdefinedarecommendation(standard)forVeryHighBitRateDigitalSubscriberLine2(VDSL2)fortheuseoverthetwistedpairphonelines.TheVDSL2protocolisknownasITUTG.993.2,andwasreleasedinFebruaryof2006.TheVDSL2standardbuildsonpreviousITUTstandardsintheDSLtechnologyareaknownasADSL,ADSL2+,andVDSL.Thebackwardscompatibilityofthesetechnologiesmaybevendordependentassomesupplierssupportwhatisreferredtoasfallback,wherebyaparticularportVDSL2portmaysupportADSL2+.

    ThecapacityofVDLS2technologyvarieswidelyinpublishedreportsandvendormaterials.Infact,inonepublishedreport,VDSL2performancewaslistedat910Mbps,

  • Copyright2015ARRISEnterprisesInc.Allrightsreserved. 7

    825Mbps,700Mbps,390Mbps,and100Mbps.Insomecases,thepublishedreportsofthedatathroughputratesmayomitkeyfactorsthatmaydeterminetheapplicabilityinrealworldenvironmentandapplications.ThedistanceofcopperwiresbetweentheDSLAMandCPEimpactsthevariationinthepublishedperformancedataofVDSL2,likeallDSLtechnologies.Additionally,theuseofchannelbondedcopperpairswillalsoincreasethethroughputnumbersstatedinpublished

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