Nrog rau txoj kev loj hlob ntawm cov nroog niaj hnub no mus rau ntau qhov kev ua haujlwm, kev teeb tsa hauv nroog tau dhau los ua ntau thiab ntau dua, thiab muaj ntau pua, pua pua, lossis ntau txhiab qhov kev soj ntsuam hauv av.Txhawm rau kom ntseeg tau tias cov haujlwm ua haujlwm tuaj yeem nkag siab lub sijhawm tiag tiag, pom tseeb thiab cov duab yeeb yaj kiab zoo sai li sai tau, Qhia qhov nro ntawm cov khoom siv fiber ntau.Tsis tas li ntawd, nyob rau niaj hnub no lub zog thiab kev ua haujlwm hauv nroog loj zuj zus, rov tso cov fiber ntau-optic cables tsis yog kim heev, tab sis kev sib koom tes ntawm txhua tog yog qhov nyuaj dua.Raws li qhov no, yuav ua li cas daws cov teeb meem saum toj no?
Qhov tseeb, tib qhov teeb meem tau ntsib nyob rau hauv kev tsim kho ntawm FTTH (Fiber mus rau Lub Tsev) los ntawm cov neeg siv xov tooj.Txhawm rau daws qhov teeb meem no, muab kev ua si tag nrho rau bandwidth zoo ntawm optical fiber ntau, daws qhov tsis txaus ntawm cov khoom siv kho qhov muag, thiab txhim kho kev ntseeg siab ntawm lub network, cov neeg siv xov tooj tau xaiv PON (passive optical network) thev naus laus zis.Cov thev naus laus zis no tseem tuaj yeem siv rau kev saib xyuas kev ruaj ntseg network.
PON (PassiveOpticalNetwork) yog ib qho kev sib txuas lus kho qhov muag.Lub network passive kho qhov muag suav nrog cov kab hluav taws xob kho qhov muag (OLT) tau teeb tsa hauv qhov chaw tswj hwm hauv nruab nrab, thiab cov txheej txheem sib txuam kho qhov muag (ONU) tau teeb tsa hauv cov neeg siv khoom.Optical distribution network (ODN) ntawm OLT thiab ONU muaj cov fibers optical thiab passive optical splitters lossis couplers.
Lub passive optical network tsis muaj cov khoom siv ua haujlwm los ntawm qhov chaw mus rau cov neeg nyob hauv lub network.Hloov chaw, cov khoom siv kho qhov muag tsis pom kev tau muab tso rau hauv lub network thiab cov kev sib kis tau raug coj los ntawm kev sib cais lub zog ntawm qhov muag qhov ntev ntawm txoj kev.Qhov kev hloov pauv no tshem tawm qhov xav tau rau cov neeg siv khoom siv thiab tswj cov khoom siv hauv lub voj voog sib kis, uas txuag cov neeg siv cov nqi zoo heev.Passive optical splitters thiab couplers tsuas yog ua lub luag haujlwm ntawm kev xa tawm thiab txwv lub teeb, tsis xav tau lub zog hluav taws xob thiab cov ntaub ntawv ua haujlwm, thiab muaj lub sijhawm tsis txwv lub sijhawm ntawm kev ua tsis tiav, uas tuaj yeem txo tus nqi kho txhua txoj hauv kev.
Qhov zoo ntawm PON thev naus laus zis yog qhov tseem ceeb hauv cov hauv qab no:
1. Optical fiber nkag network yog cov kev daws teeb meem zoo tshaj plaws rau kev txhim kho yav tom ntej, tshwj xeeb tshaj yog PON thev naus laus zis tau raug pov thawj tias nws yog ib qho txiaj ntsig zoo hauv kev sib xyaw ua ke broadband tam sim no.
2. Vim yog siv PON thev naus laus zis, tag nrho cov khoom siv kho qhov muag pom tau zoo, thiab cov khoom siv kho qhov muag passive yog qhov me me thiab yooj yim hauv cov khoom siv.Piv nrog rau tooj liab cable tes hauj lwm, PON tuaj yeem txo tus nqi txij nkawm thiab kev ua haujlwm, thiab zam kev cuam tshuam ntawm electromagnetic cuam tshuam thiab xob laim cuam tshuam.
3. Lub passive ONU (optical network unit) ntawm PON tsis xav tau cov khoom siv hluav taws xob, uas tsis tsuas yog tshem tawm cov teeb meem ntawm cov khoom siv hluav taws xob, tab sis kuj muaj kev ntseeg tau zoo dua li cov khoom siv.
4. Vim tias cov khoom siv passive tau siv thiab cov khoom siv kho qhov muag fiber ntau tau sib koom, cov nqi peev ntawm tag nrho cov khoom siv kho qhov muag yog tsawg.
5. PON yog pob tshab rau cov kab ke sib kis tau siv rau qee qhov, thiab nws yooj yim rau kev hloov kho.
PON thev naus laus zis tau dhau los ua kev lag luam thawj qhov kev xaiv rau fiber-to-the-tsev (FTTH).PON thev naus laus zis siv cov point-to-multipoint topology, thiab downlink thiab uplink xa cov ntaub ntawv los ntawm TDM thiab TDMA feem.Qhov kev ncua deb ntawm OLT thiab ONU tuaj yeem ncav cuag 20km, tus nqi sib kis yog bidirectional symmetrical 1Gbps, thiab qhov siab tshaj plaws sib cais feem ntau txhawb 1:32 lossis siab dua.Nws tuaj yeem muab faib ua ib theem lossis ntau qhov sib cais hauv cascade.
Kev siv PON thev naus laus zis tuaj yeem daws qhov teeb meem network saib xyuas bandwidth thiab kev txwv deb.Cov khoom siv OLT ntawm lub chaw ua haujlwm sab yog muab tso rau hauv chav ua haujlwm ntawm chav ua haujlwm sab.Multi-level optical splitting yog siv los paub txog kev xa tawm yooj yim ntawm cov ntsiab lus.ONU + lub koob yees duab network yog siv los ua lub davhlau ya nyob twg ua ke.ONU tuaj yeem yog PoE hloov nrog PON muaj nuj nqi.Rau cov neeg siv khoom saib xyuas chav thiab chaw cia khoom.Nws tuaj yeem raug saib xyuas hauv chav saib xyuas hauv lub sijhawm tiag tiag, thiab cov ntaub ntawv video raug xa mus rau lub chaw khaws cia tib lub sijhawm, uas pab txhawb kev sau cov pov thawj tom qab qhov tseeb.
Niaj hnub no, "kev nce qib kho qhov muag thiab kev tshem tawm tooj liab", kev siv dav dav ntawm PON thev naus laus zis yog qhov tseem ceeb tshwj xeeb.Fengrunda tau pib OLT thiab ONU cov cuab yeej, nrog rau kev txhawb nqa PON kev ruaj ntseg kev daws teeb meem, thiab thawj zaug pib hloov PoE nrog PON muaj nuj nqi, uas ua rau qhov sib txawv ntawm ONU tsis muaj PoE hauv kev ua lag luam tam sim no.Cov chaw taws teeb saib xyuas cov txheej txheem siv Pon tshuab tsim kho cov teeb meem ntawm cov teeb meem tuab thiab ua kom cov fiber ntau hauv lub nroog niaj hnub.Nws muaj qhov zoo sib xws hauv ntau yam xws li kev teeb tsa network, cov peev txheej fiber ntau, video zoo, thiab kev ntseeg tau.Txoj kev loj hlob ntawm kev lag luam tej thaj chaw deb video soj ntsuam cov kev pab cuam muab qhov zoo tshaj plaws network daws teeb meem.