Optical access network yog ib qho kev sib txuas uas siv lub teeb ua qhov nruab nrab kis, 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 chaw kho qhov muag kabOLT, optical network unitONU, thiab optical faib network ODN, nyob rau hauv uas cov ntsiab lus tseem ceeb ntawm covOLTthiabONUoptical nkag network.
Dab tsi yogOLT?
Lub npe tag nrho ntawmOLTyog Optical Line Terminal, kho qhov muag kab davhlau ya nyob twg.OLTyog ib qho kev kho qhov muag kab davhlau ya nyob twg, 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 ahloov or routernyob rau hauv ib txwm kev sib txuas lus network. 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 covONUCov neeg siv khoom siv davhlau ya nyob twg los ntawm ODN network.
Dab tsi yogONU?
ONUyog Optical Network Unit. CovONUmuaj ob txoj haujlwm: Xaiv tau qhov kev tshaj tawm xa los ntawm tusOLT, thiab tau txais cov lus teb rau lubOLTyog tias cov ntaub ntawv yuav tsum tau txais; sau thiab cache cov ntaub ntawv Ethernet uas tus neeg siv yuav tsum xa, thiab xa mus rau qhovOLTraws li qhov kev faib xa tawm Xa cov ntaub ntawv cached.
Cov txheej txheem deployment ntawmONUsnyob rau hauv sib txawv FTTx networks kuj txawv. Piv txwv li, FTTC (Fiber To The Curb):ONUmuab tso rau hauv lub hauv paus computer chav tsev ntawm lub zej zog; FTTB (Fiber rau Lub Tsev):ONUmuab tso rau hauv lub thawv sib txuas ntawm txoj kev hauv tsev; FTTH (Fiber Rau Lub Tsev):ONUmuab 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.ONUhais txog ib qho 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 ntawmONU.
Dab tsi yog kev sib raug zoo ntawmONUthiabOLT?
CovOLTyog qhov kev tswj hwm kawg, thiabONUyog lub davhlau ya nyob twg; tusONUkev muab kev pabcuam yog xa los ntawmOLT, thiab ob tug yog nyob rau hauv kev sib raug zoo tswv- qhev. NtauONUstuaj yeem dai los ntawm ib qho splitter hauv qabOLT.
ODN yog dab tsi?
ODN yog Optical Distribution Network, uas yog lub cev channel ntawm optical kis tau tus mob ntawmOLTthiabONU. 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.
