Dab tsi yog lub network qauv ntawm Optical Access Network (OAN)
Optical access network (OAN) hais txog kev siv cov fiber ntau optical ua qhov nruab nrab kis tau tus mob kom paub txog cov ntaub ntawv kis tau tus mob ntawm kev nkag mus network. Nws txuas nrog rau qhov kev pab cuam los ntawm cov kab hluav taws xob kho qhov muag (OLT), thiab txuas nrog tus neeg siv los ntawm chav tsev kho qhov muag (ONU). Optical fiber nkag network muaj xws li tej thaj chaw deb cov cuab yeej-optical network chav tsev thiab central chaw ua hauj lwm cov cuab yeej-optical kab davhlau ya nyob twg, uas yog kev cob cog rua los ntawm kis tau tus mob cov cuab yeej.Qhov tseem ceeb ntawm lub system yogOLTthiab tej thaj chaw debONU.Lawv ua tiav qhov hloov dua siab tshiab ntawm signaling raws tu qauv los ntawm cov kev pabcuam node interface (SNI) mus rau tus neeg siv lub network interface (UNI) nyob rau hauv tag nrho cov nkag network. Cov cuab yeej siv nws tus kheej kuj muaj peev xwm sib txuas lus thiab tuaj yeem tsim ntau hom kev sib txuas hauv network. Nyob rau tib lub sijhawm, cov cuab yeej siv kuj tseem muaj lub luag haujlwm ntawm kev saib xyuas hauv zos thiab kev saib xyuas hauv cheeb tsam hauv cheeb tsam, tsim kev tswj xyuas kev tswj xyuas network los ntawm kev sib kis ntawm qhov muag pom, thiab coj mus rau hauv lub network tswj chaw rau kev tswj hwm kev sib koom ua ke los ntawm cov txheej txheem tswj hwm kev sib raug zoo.
Lub luag hauj lwm ntawm covOLTyog muab ib qho kev sib txuas ntawm kev nkag mus hauv network thiab hauv zoshloov, thiab sib txuas lus nrog lub optical network unit ntawm tus neeg siv sab los ntawm optical kis tau tus mob. Nws kiag li cais qhov kev hloov pauv ntawm cov haujlwmhloovlos ntawm cov neeg siv khoom. Optical kab davhlau ya nyob twg muab kev saib xyuas thiab saib xyuas ntawm nws tus kheej thiab cov neeg siv kawg. Nws tuaj yeem muab tso ncaj qha rau ntawm qhov chaw sib pauv qhov kawg ua ke nrog kev sib pauv hauv zos, lossis nws tuaj yeem teeb tsa rau ntawm qhov kawg ntawm qhov kawg.
Kev ua haujlwm ntawmONUyog muab tus neeg siv-sab interface rau kev nkag network. Nws tuaj yeem txuas nrog ntau yam ntawm cov neeg siv cov terminals, thiab tib lub sijhawm muaj kev hloov pauv photoelectric muaj nuj nqi thiab kev saib xyuas thiab saib xyuas cov haujlwm. Lub luag haujlwm tseem ceeb ntawm lubONUyog txiav tawm cov fiber ntau optical los ntawmOLT, ua cov teeb liab kho qhov muag thiab muab kev pabcuam cuam tshuam rau ntau lub lag luam me, cov neeg siv lag luam thiab cov neeg siv nyob hauv. Lub network kawg ntawm lubONUyog ib qho optical interface, thiab nws cov neeg siv kawg yog hluav taws xob interface. Yog li ntawd,ONUmuaj optical / hluav taws xob thiab hluav taws xob / kho qhov muag hloov ua haujlwm. Nws kuj muaj cov haujlwm ntawm digital / analog thiab analog / digital hloov dua siab tshiab ntawm kev sib tham. CovONUfeem ntau yog muab tso rau ze rau tus neeg siv, thiab nws qhov chaw muaj qhov yooj yim heev.
Optical Access Network (OAN) tau muab faib ua Active Optical Network (AON, Active Optical Network) thiab Passive Optical Network (PON, Passive Optica Optical Network) raws li kev faib khoom.
Cov qauv topological ntawm optical fiber nkag network yog hais txog kev teeb tsa geometric ntawm cov kab sib kis thiab cov nodes. Nws qhia txog kev sib nrig sib pab thiab kev sib txuas layout ntawm txhua qhov ntawm lub network. Cov qauv topological ntawm lub network muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm hauv lub network, tus nqi thiab kev ntseeg siab. Peb lub hauv paus topological qauv yog: tsheb npav-puab, nplhaib-puab thiab lub hnub qub-puab. Los ntawm qhov no, lub hnub qub tsheb npav, ob lub hnub qub, ob lub nplhaib, tsheb npav thiab lwm daim ntawv thov ua ke tuaj yeem muab tau. Txhua tus muaj nws tus yam ntxwv thiab kev sib nrig sib ntxiv.