Optical access network yog ib qho kev siv lub teeb uas siv lub teeb ua qhov nruab nrab ntawm kev sib kis, hloov cov hlau tooj liab, kom nkag mus rau txhua tsev neeg. Optical access network feem ntau muaj peb yam: optical kab davhlau ya nyob twg (OLT), kho qhov muag network unit (ONU), thiab kho qhov muag faib network (ODN), uas OLT thiab ONU yog cov tseem ceeb Cheebtsam ntawm lub optical access network.
OLT yog dab tsi?
Lub npe tag nrho ntawm OLT yog Optical Line Terminal. OLT yog cov kab hluav taws xob kho qhov muag, uas yog cov khoom siv hauv chaw ua haujlwm sib txuas lus siv los txuas cov kab fiber ntau optic kab. Nws txoj haujlwm yog sib npaug rau kev hloov pauv lossis router hauv cov kev sib txuas lus ib txwm muaj, thiab nws yog ib qho khoom siv uas ua haujlwm raws li kev nkag mus rau sab nraud thiab lub network nkag thiab tawm. Muab tso rau ntawm qhov chaw ua haujlwm kawg, cov haujlwm tseem ceeb tshaj plaws yog kev teem caij tsheb, kev tswj tsis tau, thiab muab cov neeg siv kev taw qhia passive fiber ntau optic network interfaces thiab faib bandwidth. Cias muab, nws txhais tau hais tias siv ob lub luag haujlwm: ntws dej, ua kom tiav cov dej ntws nkag ntawm PON network; Rau cov dej ntws qis, cov ntaub ntawv tau txais yuav raug xa mus rau txhua tus neeg siv ONU cov 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 txais kev tshaj tawm los ntawm OLT, thiab teb rau OLT txais tos yog tias cov ntaub ntawv xav tau; Sau thiab cache cov ntaub ntawv Ethernet uas cov neeg siv yuav tsum xa, thiab xa cov ntaub ntawv cached mus rau OLT kawg raws li lub qhov rais xa.
Kev xa tawm ntawm ONU txoj kev nkag mus txawv tebchaws sib txawv hauv FTTx tes hauj lwm, xws li FTTC (Fiber To The Curb): ONU tau muab tso rau hauv cov ntaub ntawv tseem ceeb hauv zej zog; FTTB (Fiber Rau Lub Tsev): ONU muab tso rau hauv lub thawv sib txuas hauv txoj kev; FTTH (Fiber To The Home): ONU muab tso rau hauv cov neeg siv hauv tsev.
ONT yog dab tsi?
ONT yog Optical Network Terminal, lub davhlau ya nyob twg ntawm FTTH, feem ntau hu ua "lub teeb miv", zoo ib yam li xDSL hluav taws xob miv. ONT yog lub davhlau ya nyob twg kho qhov muag siv rau cov neeg siv kawg, thaum ONU hais txog chav tsev kho qhov muag uas yuav muaj lwm cov tes hauj lwm nrog cov neeg siv kawg. ONT yog ib feem ntawm ONU.
Kev sib raug zoo ntawm ONU thiab OLT yog dab tsi?
OLT yog qhov kawg tswj, ONU yog lub davhlau ya nyob twg; Kev ua lag luam ntawm ONU yog muab los ntawm OLT, thiab ob qho tib si muaj kev sib raug zoo ntawm tus tswv- qhev. Ntau ONUs tuaj yeem ntsia tau los ntawm kev sib cais hauv ib qho OLT.