Optical access network yog ib qho kev sib txuas uas siv lub teeb ua qhov nruab nrab kis tau tus mob, hloov cov xov tooj tooj liab, thiab siv los nkag rau txhua lub tsev.Ib qho optical access network feem ntau muaj peb ntu: ib qho kho qhov muag kab davhlau ya nyob twg OLT, ib qho chaw kho qhov muag ONU, thiab ib qho kev faib khoom kho qhov muag ODN, uas yog cov khoom tseem ceeb ntawm OLT thiab ONU optical access network.
OLT yog dab tsi?
Lub npe tag nrho ntawm OLT yog Optical Line Terminal, kho qhov muag kab davhlau ya nyob twg.OLT yog lub davhlau ya nyob twg kho qhov muag, thiab yog cov khoom siv hauv chaw ua haujlwm hauv kev sib txuas lus.Nws yog siv los txuas optical fiber trunks.Nws ua haujlwm li hloov lossis router hauv kev sib txuas lus ib txwm siv.Nws yog ib qho khoom siv rau kev nkag ntawm lub network sab nraud thiab kev nkag thiab tawm ntawm lub network sab hauv.Muab tso rau ntawm lub chaw ua haujlwm hauv nruab nrab, qhov tseem ceeb tshaj plaws ua haujlwm yog kev teem caij tsheb, kev tswj tsis tau, thiab muab cov neeg siv-oriented passive optical network interfaces thiab faib bandwidth.Hauv cov ntsiab lus yooj yooj yim, nws siv ob txoj haujlwm: ntws ntws, nws ua tiav cov dej ntws nkag ntawm PON network;thiab downstream, nws xa cov ntaub ntawv tau txais mus rau tag nrho ONU cov neeg siv khoom siv davhlau ya nyob twg los ntawm ODN network.
ONU yog dab tsi?
ONU yog Optical Network Unit.ONU muaj ob txoj haujlwm: Xaiv tau qhov tshaj tawm xa los ntawm OLT, thiab tau txais cov lus teb rau OLT yog tias cov ntaub ntawv xav tau;sau thiab cache cov ntaub ntawv Ethernet uas tus neeg siv yuav tsum tau xa, thiab xa mus rau OLT raws li kev faib xa cov qhov rai Xa cov ntaub ntawv cached.
Txoj kev xa tawm ntawm ONUs hauv FTTx network sib txawv kuj txawv.Piv txwv li, FTTC (Fiber To The Curb): ONU muab tso rau hauv lub hauv paus computer chav hauv zej zog;FTTB (Fiber Rau Lub Tsev): ONU muab tso rau hauv lub thawv sib txuas ntawm txoj kev hauv tsev;FTTH (Fiber To The Home): ONU muab tso rau hauv cov neeg siv hauv tsev.
ONT yog dab tsi?
ONT yog Optical Network Terminal, feem ntau lub davhlau ya nyob twg ntawm FTTH, feem ntau hu ua "optical cat", zoo ib yam li xDSL hluav taws xob miv.ONT yog lub davhlau ya nyob twg optical network thiab siv rau cov neeg siv kawg.ONU hais txog qhov chaw kho qhov muag network.Tej zaum yuav muaj lwm cov tes hauj lwm ntawm nws thiab cov neeg siv kawg.ONT yog ib feem tseem ceeb ntawm ONU.
Kev sib raug zoo ntawm ONU thiab OLT yog dab tsi?
OLT yog qhov kawg ntawm kev tswj hwm, thiab ONU yog lub davhlau ya nyob twg;ONU kev pabcuam yog xa los ntawm OLT, thiab ob qho tib si nyob rau hauv kev sib raug zoo-tus qhev.Ntau ONUs tuaj yeem dai los ntawm kev sib cais hauv qab OLT.
ODN yog dab tsi?
ODN yog Optical Distribution Network, uas yog lub cev channel ntawm optical kis tau tus mob ntawm OLT thiab ONU.Lub luag haujlwm tseem ceeb yog ua kom tiav bidirectional kis tau tus mob ntawm optical signals.Feem ntau cov no txuas nrog fiber ntau optic cables, optical connectors, optical splitters, thiab installation.Cov cuab yeej txhawb nqa ntawm lub cuab yeej yog tsim los ntawm optical splitters.
