TheGreatCompromiseforWDMandTDM
Coexistencein100GEPON(IEEE802.3ca)
Michael“Mike”Emmendorfer
VicePresident,SystemsEngineeringandArchitecture
CTONetworksGroup
March7,2017
Backgroundon100GEPON(IEEE802.3ca)Wavelength
Op.onsandWDMvs.TDMCoexistence
• 
Thedebateforthe100GPONWavelengthPlanandsupportforeitherWDM“or”TDMCoexistencewith802.3avhasbeenanopentopicsincetheincep.onofthe
workinggroup(September2015)
• 
TheWDMcoexistence“PlanA”woulddefineallfourIEEE802.3ca100GEPONwavelengthstoavoidthedefinedIEEE802.3av10GEPONupstreamwavelengthof
1270nm±10occupying1260-1280nm
• 
• 
• 
– 
From:johnson_3ca_1a_0916andharstead_3ca_1_0117alsoknownas“ProposedWavelengthPlanA”
– 
From:zhang_3ca_1_1116andharstead_3ca_1_0117alsoknownas“CostOp1miza1onProposedforPlanA”
– 
From:guo_3ca_1_0117knownas“ProposedWavelengthPlanA2nmwide”
TheTDMcoexistence“PlanB”woulddefineoneofthefourIEEE802.3ca100GEPONwavelengthstooverlapwiththedefinedIEEE802.3av10GEPONupstream
wavelengthof1270nm±10occupying1260-1280nm
– 
From:harstead_3ca_2b_0916andharstead_3ca_1_0117alsoknownas“OriginalPlanB”
– 
From:zhang_3ca_1_1116andharstead_3ca_1_0117alsoknownas“ModifiedPlanB(1)”
– 
From:zhang_3ca_1_1116andharstead_3ca_1_0117alsoknownas“ModifiedPlanB(2)”
Alloftheabovemen.onedproposalsoverlapwiththedefinedIEEE802.3ah“EPON”andG.984“GPON”upstreamwavelengthplans
– 
EPON:IEEE802.3ah1310nm±50
– 
GPON:G.984.21310nm±50,G.984.51310nm±40,G.984.51310nm±20
– 
BothPlanAandPlanBrequireEPONandGPONtonotsharethesamefiber.
TheCommi]eeStruggledOvertheSelec.onoftheWavelengthPlanEither:PlanA“or”PlanBbecausethisalsomeantpickingWDM“or”TDM.
– 
“TheGreatCompromiseispossiblyapathtomakingawavelengthselec.onwhilealsodefiningsupportforWDMandTDM”
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Objec.vesforTheGreatCompromiseforTDMand
WDMCoexistencein100GEPON(IEEE802.3ca)
•  TheCompromiseUsesPlanB(ModifiedPlanB)while“also”suppor.ngbothTDM“and”WDMCoexistence
•  DefinessupportforbothTDMandWDMcoexistenceintheIEEE802.3castandardtoenablechoiceandflexibilityfor
differentoperatordeploymentscenarios(Seefollowingslidesfor“TheGreatCompromiseDeploymentScenarios”)
–  Insteadofthecommi:eepickingeitherTDMorWDMwecandefineboth
•  DefinesfourupstreamwavelengthsusingtheModifiedPlanBop.onforIEEE802.3ca
–  Recallthattheλ0,λ1,λ2,λ3wavelengthsaredifferentbetweenPlanA“WDM”andPlanB“TDM”
–  Thispresenta1onuses“ModifiedPlanB”withupstreamλ01270±10,λ11291.652±1.5,λ21298.365±1.5,andλ31305.148±1.5
–  Modifica1onstotheexactwavelengthvaluesusedinPlanBmaymaychangeslightlymovingforward
•  TheGreatCompromisetakesthebesta]ributesfrombothOp.calPlanAandPlanB:
–  PlanA(WDMCoexistence)
•  Enabled25Gx25Gcapacitytobea:ainedbecausethereareno10GONUssharingthewavelength
•  Allowed10GEPONorXGS-PONOLTstocoexistwith802.3cathusnotrequiringaforklilofthosesystemstoini1allydeploy802.3casystemsonthesameODN
–  What“TheGreatCompromise”doesisallowforadelayintheuseofthoseoverlapping802.3av/XGSlambdasun1llateinthe802.3cadeploymentcyclee.g.when100GONUsare
needed,andthusessen1allythe802.3avwavelengthcouldbethelastoneused
–  PlanB(TDMCoexistence)
•  Enablestheuseof802.3avand802.3catojustfourupstreamwavelengths
•  Enablesfourwidechannel(3nm)wavelengthsandthismeanslowercostcomparedtonarrowchannels
•  Useof802.3avupstreamwavelength1260-1280allowsthefewestwavelengthsintheZDW1300-1324nmregion
•  Enabledcoexistenceandbackwardcompa1bilitywith10GEPON
–  The802.3caOLTcouldsupport802.3avcompletelyfromthesamechip,port,andsinglewideband1260-1280receiverifdesired
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TheGreatCompromiseDeploymentScenarios
Op.on1a:WDMandTDMScenariosusedifferentupstreamop.csfor25x25GONUsand50x50GONUs
1stGen802.3ca–25G-EPON
2ndGen802.3ca–50G-EPON
3rdGen802.3ca–100G-EPON
WDMDeploymentScenario
WDMDeploymentScenario
WDMDeploymentScenario
802.3ca
OLT
λ01270±10
802.3ca
OLT
PowerSpli:er
TDMDeploymentScenario
λ11291.652±1.5
25x25G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
λ01270±10
802.3ca
OLT
λ11291.652±1.5
802.3av
OLT
802.3ca
OLT
λ11291.652±1.5
50x50G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
25x25G
ONU
PowerSpli:er
25x25G
ONU
10x10G
ONU
λ01270±10
λ01270±10
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
λ31305.148±1.5
PowerSpli:er
λ11291.652±1.5
802.3av
OLT
PowerSpli:er
802.3ca
OLT
PowerSpli:er
802.3av
OLT
10x10G
ONU
λ01270±10
PowerSpli:er
10x10G
ONU
λ01270±10
10x10G
ONU
25x10G
ONU
25x25G
ONU
50x50G
ONU
100x100G
ONU
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TheGreatCompromiseDeploymentScenarios
Op.on1b:Adds75x75GONUstoWDMandTDM(benefitforWDMisitextendstheserviceof10GOLTs)
1stGen802.3ca–25G-EPON
2ndGen802.3ca–50G-EPON
3rdGen802.3ca–100G-EPON
WDMDeploymentScenario
WDMDeploymentScenario
WDMDeploymentScenario
802.3ca
OLT
λ01270±10
802.3ca
OLT
PowerSpli:er
TDMDeploymentScenario
λ11291.652±1.5
25x25G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
λ01270±10
802.3ca
OLT
λ11291.652±1.5
802.3av
OLT
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
50x50G
ONU
25x25G
ONU
50x50G
ONU
75x75G
ONU
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
25x25G
ONU
PowerSpli:er
25x25G
ONU
10x10G
ONU
λ01270±10
λ01270±10
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
λ31305.148±1.5
PowerSpli:er
λ11291.652±1.5
802.3av
OLT
PowerSpli:er
802.3ca
OLT
PowerSpli:er
802.3av
OLT
10x10G
ONU
λ01270±10
PowerSpli:er
10x10G
ONU
λ01270±10
10x10G
ONU
25x10G
ONU
25x25G
ONU
50x50G
ONU
75x75G
ONU
100x100G
ONU
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TheGreatCompromiseDeploymentScenarios
Op.on2a:WDMandTDMScenarioshaveanop.ontousethesame25x25G“and”50x50GONUs
TDMusesWidebandRx“or”2channelRxin802.3caOLTin1stand2ndGenDeployments
1stGen802.3ca–25G-EPON
2ndGen802.3ca–50G-EPON
3rdGen802.3ca–100G-EPON
WDMDeploymentScenario
WDMDeploymentScenario
WDMDeploymentScenario
802.3ca
OLT
λ01270±10
λ11291.652±1.5
802.3ca
OLT
PowerSpli:er
TDMDeploymentScenario
λ11291.652±1.5
25x25G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
λ01270±10
λ11291.652±1.5
802.3ca
OLT
λ21298.365±1.5
802.3av
OLT
802.3ca
OLT
λ11291.652±1.5
50x50G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
25x25G
ONU
PowerSpli:er
25x25G
ONU
10x10G
ONU
λ01270±10
λ01270±10
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
λ31305.148±1.5
PowerSpli:er
λ11291.652±1.5
802.3av
OLT
PowerSpli:er
802.3ca
OLT
PowerSpli:er
802.3av
OLT
10x10G
ONU
λ01270±10
PowerSpli:er
10x10G
ONU
λ01270±10
10x10G
ONU
25x10G
ONU
25x25G
ONU
50x50G
ONU
100x100G
ONU
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TheGreatCompromiseDeploymentScenario
Op.on2b:Adds75x75GONUstoWDMandTDM(sameop.csforbothscenarios)
1stGen802.3ca–25G-EPON
2ndGen802.3ca–50G-EPON
3rdGen802.3ca–100G-EPON
WDMDeploymentScenario
WDMDeploymentScenario
WDMDeploymentScenario
802.3ca
OLT
λ01270±10
λ11291.652±1.5
802.3ca
OLT
PowerSpli:er
TDMDeploymentScenario
λ11291.652±1.5
25x25G
ONU
25x25G
ONU
50x50G
ONU
λ21298.365±1.5
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
λ01270±10
λ11291.652±1.5
802.3ca
OLT
λ21298.365±1.5
802.3av
OLT
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
50x50G
ONU
25x25G
ONU
50x50G
ONU
75x75G
ONU
TDMDeploymentScenario
10x10G
ONU
25x10G
ONU
25x25G
ONU
PowerSpli:er
25x25G
ONU
10x10G
ONU
λ01270±10
λ01270±10
802.3ca
OLT
λ11291.652±1.5
λ21298.365±1.5
λ31305.148±1.5
PowerSpli:er
λ11291.652±1.5
802.3av
OLT
PowerSpli:er
802.3ca
OLT
PowerSpli:er
802.3av
OLT
10x10G
ONU
λ01270±10
PowerSpli:er
10x10G
ONU
λ01270±10
10x10G
ONU
25x10G
ONU
25x25G
ONU
50x50G
ONU
75x75G
ONU
100x100G
ONU
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TheGreatCompromiseConclusions
1. 
2. 
TheCompromiseUsesPlanB(ModifiedPlanB)while“also”suppor.ngbothTDM“and”WDMCoexistence
TheCompromisetakesthebesta]ributesfrombothPlanAandPlanBop.calplans:
•  Enabled25Gx25Gcapacitytobea:ainedbecausethereareno10GONUssharingthewavelength
•  Allowforadelayintheuseofthoseoverlapping802.3av/XGSlambdasun1llateinthe802.3cadeploymentcyclee.g.when100GONUsareneeded,
andthusessen1allythe802.3avwavelengthcouldbethelastoneused
•  Enablesfourwidechannel(3nm)wavelengthsandthismeanslowercostcomparedtonarrowchannels
•  Useof802.3avupstreamwavelength1260-1280allowsthefewestwavelengthsintheZDW1300-1324nmregion
3. 
TheCompromiseAllowsthe802.3caTaskForcetodefinesupportforbothTDMandWDMtoenableflexibility
foroperatorusecasesanddeploymentscenarioswhilekeepingthepermuta.onslowfortheindustry
•  WDMenablesoperatorstokeeplegacy10GOLTsdeployed
•  TDMenablesoperatorstokeep10GONUsdeployedwhileservingallcustomersfrom802.3caOLT
4.  TheCompromiseSupportsSeveralDeploymentScenarios
•  Op1on1a:
–  WDMandTDMScenariosusedifferentupstreamop1csfor25x25GONUsand50x50GONUs
–  Op1on1bifurcatesboththe25x25Gand50x50GONUmarketbecausetheop1csaredifferent
–  Op1on1whenTDMisdeployedallowslambda0tobeusedfor10x10G,25x10G,and25x25GONUsthisshouldhaveposi1vebenefitsonONUcosts(Requireremovalof
10GOLTs)
–  Op1on1whenWDMischosentheforklil/removalofthe802.3av10GOLTsmaybedelayedun1l100GONUsaredeployed(thatwoulduselambda0)
•  Op1on2a:
–  TDMScenariohasanop1ontousethesame25x25G“and”50x50GONUsasusedintheWDMScenario
–  TDMusesWidebandRx“or”2channelRxin802.3caOLTin1stand2ndGenDeployments
–  Op1on2keepstheONUmarketfor25x25Gand50x50GlargebecausetheyareusedinTDMorWDMScenarios
–  Op1on2keepsthe10GONUmarketalivebysuppor1ng10x10and25x10ONUs(10x10ONUsusedinTDMorWDMScenarios)
•  Op1onalsupportfor75x75GONUswascoveredforTDMorWDMifdesiredbytheTaskForces
5. 
TheWorkingGroupNeedstoStudytheDeploymentScenariosandOp.onsoftheCompromiseProposal
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ThankYou
[email protected]
7March2017
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