Lub vev xaib kho qhov muag tau yog lub vev xaib nkag mus uas siv lub teeb ua lub xa hluav taws xob, tsis siv cov xov tooj liab, thiab yog siv rau kev nkag mus rau txhua tsev neeg. Kho qhov muag siv network. Optical nkag network feem ntau muaj peb ntu: kho qhov muag kab davhlau ya nyob twg OLT, optical network unit ONU, optical network network ODN, cov uas OLT thiab ONU yog cov khoom tseem ceeb ntawm kev siv network kho qhov muag.
OLT yog dab tsi?
Lub npe tag nrho ntawm OLT yog Optical Line Terminal, qhov kho qhov muag kab davhlau ya nyob twg. OLT yog qhov kho qhov muag kab davhlau ya nyob twg thiab lub chaw ua haujlwm nruab nrab ntawm cov khoom siv hauv kev sib txuas lus. Nws yog siv los txuas cov kab xo optical fiber ntau. Nws ua haujlwm xws li hloov chaw los yog router hauv cov kab ke sib txuas lus. Nws yog cov cuab yeej ntawm nkag ntawm lub network sab nraud thiab nkag ntawm lub network sab hauv. Muab tso rau ntawm lub chaw haujlwm loj, cov haujlwm tseem ceeb tshaj plaws yog kev tswjfwm kev tsheb khiav, kev tiv thaiv tsis haum, thiab kev pabcuam cov neeg siv-dhau tus neeg siv lub ntsej muag kho qhov muag ua haujlwm ua ke thiab kev faib bandwidth. Txhawm rau muab nws yooj yim, nws yog kom ua tiav ob lub zog. Txog kev ntws los, nws ua tiav kev nkag los ntawm PON network; rau hauv nqes dej, cov ntaub ntawv xav tau raug xa thiab xa mus rau txhua tus neeg siv ONU lub davhlau ya nyob twg los ntawm ODN network.
ONU yog dab tsi?
ONU yog Optical Network Unit. ONU muaj ob txoj haujlwm: nws xaiv tau txais kev tshaj tawm los ntawm OLT, thiab teb rau OLT yog tias cov ntaub ntawv xav tau txais; sib sau thiab khaws cov ntaub ntawv Ethernet uas tus neeg siv yuav tsum tau xa, thiab xa nws mus rau OLT raws li lub luag haujlwm xa lub qhov rai Xa cov ntaub ntawv cached
Hauv FTTx network (nyem qhov no kom paub sai sai txog FTTx), kev xa tawm ntawm ONU cov txheej txheem sib txawv kuj txawv, xws li FTTC (Fiber To The Curb): ONU muab tso rau hauv chav computer nruab nrab ntawm cov zej zog; FTTB (Fiber Rau Lub Tsev): ONU muab tso rau hauv txoj kev hauv tsev FTTH (Fiber Rau Tsev): ONU muab tso rau hauv tus neeg siv khoom hauv tsev.
ONT yog dab tsi?
ONT yog qhov kho qhov muag Network Terminal, feem ntau cov davhlau ya nyob twg ntawm FTTH, feem ntau hu ua" optical modem", uas zoo ib yam li cov qauv hluav taws xob ntawm xDSL. ONT yog qhov kho qhov muag network davhlau ya nyob twg, uas tau thov rau tus neeg siv zaum kawg, thaum ONU hais txog lub network kho qhov muag, thiab tej zaum yuav muaj lwm lub network ntawm nws thiab tus neeg siv kawg. ONT yog qhov tseem ceeb ntawm ONU.
ONU thiab OLT txoj kev sib raug zoo yog dab tsi?
Tus OLT yog tus tswj lub davhlau ya nyob twg, thiab ONU yog lub davhlau ya nyob twg; qhov kev pabcuam ua haujlwm ntawm ONU muab tawm los ntawm OLT, thiab ob yog nyob rau hauv kev sib raug zoo ntawm tus tswv-qhev. Ntau ONUs tuaj yeem txuas rau ib qho OLT los ntawm kev muab cov khoom siv sib cais.
ODN yog dab tsi?
ODN yog Optical Distribution Network, optical faib network, yog kho qhov muag xa hluav taws xob lub cev ntawm OLT thiab ONU, lub luag haujlwm tseem ceeb yog ua kom tiav ob txoj kev xa cov kab hluav taws xob, feem ntau los ntawm cov kab hluav taws xob kho qhov muag, cov khoom sib txuas, optical splitters thiab installation rau txuas cov khoom tivthaiv Cov khoom siv' s txhawb nqa cov khoom siv, cov khoom siv tseem ceeb tshaj plaws yog cov siv hluav taws xob kho qhov muag.
