Inethiwekhi yokufikelela kwi-optical access network isebenzisa ukukhanya njengendlela yokuhambisa, ithatha indawo yeengcingo zobhedu, kwaye isetyenziselwa ukufikelela kwikhaya ngalinye. Uthungelwano lofikelelo lwamehlo ngokubanzi lunamacandelo amathathu: i-terminal yomgca wokukhanyaOLT, iyunithi yenethiwekhi yamehloI-ONU, kunye nenethiwekhi yokuhanjiswa kwe-optical ODN, apho amacandelo aphambili eOLTkwayeI-ONUinethiwekhi yokufikelela kumbono.
Yintoni iOLT?
Igama elipheleleyo leOLTyi-Optical Line Terminal, i-terminal ye-optical line.OLTyitheminali yomgca wokukhanya, kwaye sisixhobo se-ofisi esisembindini sonxibelelwano ngefowuni. Isetyenziselwa ukudibanisa i-optical fiber trunks. Isebenza njengetshintsha or umzilakuthungelwano lonxibelelwano lwemveli. Sisixhobo sokungena kwinethiwekhi yangaphandle kunye nokungena kunye nokuphuma kwenethiwekhi yangaphakathi. Ibekwe kwi-ofisi esembindini, eyona misebenzi ibalulekileyo yokwenziwa kukucwangciswa kwetrafikhi, ulawulo lwe-buffer, kunye nokubonelela ngojongano lwenethiwekhi ye-passive optical network kunye nokwabiwa kwe-bandwidth. Ngemigaqo elula, iphumeza imisebenzi emibini: phezulu, igqiba ukufikelela phezulu kwenethiwekhi yePON; kwaye ezantsi, ithumela idatha efunyenweyo kubo bonkeI-ONUisixhobo seterminal yomsebenzisi ngenethiwekhi yeODN.
Yintoni iI-ONU?
I-ONUyiYunithi yeNethiwekhi yokubona. II-ONUinemisebenzi emibini: Ngokukhethekileyo fumana usasazo oluthunyelwe yiOLT, kwaye ufumane impendulo kwiOLTukuba idatha kufuneka yamkelwe; qokelela kwaye cache data Ethernet ukuba umsebenzisi kufuneka ukuthumela, kwaye uyithumele kwiOLTngokwefestile yokuthumela eyabelweyo
Iindlela zokusasazwa kweIi-ONUkwiinethiwekhi ezahlukeneyo zeFTTx nazo zahlukile. Umzekelo, iFTTC (iFayibha ukuya kwiCurb):I-ONUibekwe kwigumbi lekhompyutha elisembindini yoluntu; I-FTTB (IFayibha ukuya kwiSakhiwo):I-ONUibekwe kwibhokisi yokuhlangana yepaseji; I-FTTH (IFayibha ukuya eKhaya):I-ONUibekwe kubasebenzisi basekhaya.
Yintoni i-ONT?
I-ONT yi-Optical Network Terminal, eyona yunithi yesiphelo ye-FTTH, eyaziwa ngokuba yi-"optical cat", efana ne-xDSL electric cat. I-ONT yi-terminal yenethiwekhi ye-optical kwaye isetyenziselwa abasebenzisi bokuphela.I-ONUibhekisa kwiyunithi yomsebenzi womnatha obonakalayo. Kusenokubakho ezinye iinethiwekhi phakathi kwayo kunye nomsebenzisi wokugqibela. I-ONT yinxalenye ebalulekileyo yeI-ONU.
Yintoni ubudlelwane phakathiI-ONUkwayeOLT?
IOLTsisiphelo solawulo, kwaye iI-ONUyitheminali; iI-ONUUbonelelo ngenkonzo lunikezelwa ngeOLT, yaye aba babini bakulwalamano lwenkosi nekhoboka. EzininziIi-ONUinokuxhonywa ngesiqhekeza phantsi kweOLT.
Yintoni iODN?
I-ODN yiNethiwekhi ye-Optical Distribution, eyijelo lomzimba losasazo lwe-optical phakathiOLTkwayeI-ONU. Umsebenzi oyintloko kukugqiba ukuhanjiswa kwe-bidirectional yezibonakaliso ze-optical. Ngokuqhelekileyo ezi ziqhagamshelwe ngeentambo zefiber optic, izihlanganisi zamehlo, i-optical splitters, kunye nofakelo. Izixhobo ezixhasayo zesixhobo ziqulunqwe ngama-splitter optical.
