Zte ZXR10 2900 Series - EPON Function of ZXR10 2900

Chapter7ServiceConguration
andEPON/GEPONarePON-basedtechnologies.Theyadoptthe
differentL2technologies.
EPONOverview
EthernetintheFirstMileAlliance(EFMA)broughtforwardEPONin
2001,whichreplacesATMwithEthernetnetworkonlayer2,and
IEEE802.3ahworkinggroupstandardizedEPON.IEEE802.3EFM
workinggroupreleasedIEEE802.3ahasEPONstandardinJune,
2004(ThisstandardwasmergedintoIEEE802.3-2005standard)
tosolvetheproblemof“thelastonemile” .
EPONisEthernetnetworkcarryingonPONnetwork,whichsup-
ports1.25Gbpssymmetricrate.Itiseasytodeployandmaintain.
Meanwhile,EPONinheritssimplicityandhighefciencyfromEther-
netnetwork.Itisverysuitableforwide-bandaccessofIPservice
tocombineEthernetandPONtechnologiestogether .
EPONneedn’tcomplexprotocolandopticalsignalcanbecorrectly
transmittedbetweencentralofceandterminal.EPONapplies
maturefullduplexEthernettechnologyandTDM(TimeDivision
MultiplexandMultiplexer).ONUsendsdatapacketinitstimeslot
soitdoesn’thaveconictwithotherONUs,whichmakesthebest
useofthebandwidth.
EPONCharacteris-
tics
�AllbearerdevicesinEPONnetworkarepassive,sothepower
networkisnotrequired.
�EPONadoptswavelengthdivisionmultiplexingtechnology.The
uplinkanddownlinkowaretransmittedonanopticalber ,
whichsavesalotofber .
�EPONworksonphysicalandlogicallinklayer .Itistotallytrans-
parenttothehighlevelservicesandprotocol.
�EPONispointtomulti-pointaccessmethod,whichsavesthe
portnumbersonconvergenceside.
EPONRelated
Concepts
�OLT:OpticalLineTerminal.Theconvergencenodeonthedi-
rectionofuplink.Itistheopticallineterminaloncentralofce
end.
�ONU:OpticalNetworkUnit.Itistheaccessnodeofoptical
networkunitonsubscriberside.
EPONFunctionofZXR102900
ZXR102920andZXR102928becomeONUafterloadingPON
functiondaughtercard.PONfunctiondaughtercardisshownas
“RS-2800-1GE-SFF”.WhentheuplinkopticalportofPONdaugh-
tercardconnectswithOLToncentralofceside,switchaccesses
EPONnetworksystem.
EPONnetworksystemhastheabilitytocarryEthernet/IPservice
andcansupportvoiceservice,TDMserviceandCATVservice.ONU
supportsOLTremotelymanagesitbyextendedOAM.
CondentialandProprietaryInformationofZTECORPORATION139