Ungayihlula njani inethiwekhi yokufikelela kwe-optical OLT, ONU, ODN, ONT?

Inethiwekhi yokufikelela kwi-optical yinethiwekhi yokufikelela esebenzisa ukukhanya njengesixhobo sokudlulisa, endaweni yeengcingo zobhedu, kwaye isetyenziselwa ukufikelela kuyo yonke indlu. Inethiwekhi yokufikelela kwi-optical. Inethiwekhi yokufikelela kwi-optical ngokubanzi inamacandelo amathathu: i-optical line terminal OLT, iyunithi yenethiwekhi ye-optical ONU, inethiwekhi yokusasazwa kwe-optical ODN, phakathi kwazo i-OLT kunye ne-ONU zizinto eziphambili zenethiwekhi yokufikelela kwi-optical.

Yintoni i-OLT?

Igama elipheleleyo le-OLT yi-Optical Line Terminal, i-optical line terminal. I-OLT si-optical line terminal kunye nezixhobo zeofisi eziphambili zonxibelelwano. Isetyenziselwa ukudibanisa imigca ye-trunk ye-optical fiber. Isebenza njengeswitshi okanye i-router kwinethiwekhi yonxibelelwano yendabuko. Sisixhobo esisemnyango wenethiwekhi yangaphandle kunye nomnyango wenethiwekhi yangaphakathi. Ibekwe kwi-ofisi ephakathi, imisebenzi ebalulekileyo yolawulo kukucwangciswa kwethrafikhi, ulawulo lwe-buffer, kunye nokubonelela nge-interfaces yenethiwekhi ye-optical ejolise kumsebenzisi kunye nokwabiwa kwe-bandwidth. Ngamafutshane, kukufezekisa imisebenzi emibini. Kwi-upstream, igqibezela ukufikelela okuphezulu kwenethiwekhi ye-PON; kwi-downstream, idatha efunyenweyo ithunyelwa kwaye isasazwe kuzo zonke izixhobo ze-ONU user terminal ngenethiwekhi ye-ODN.

Yintoni i-ONU?

I-ONU yiYunithi yeNethiwekhi yoBuchule. I-ONU inemisebenzi emibini: ifumana ngokukhetha usasazo oluthunyelwe yi-OLT, kwaye iphendula kwi-OLT ukuba idatha ifuna ukufunyanwa; iqokelela kwaye ibeke idatha ye-Ethernet ekufuneka ithunyelwe ngumsebenzisi, kwaye iyithumele kwi-OLT ngokwefestile yokuthumela ebekelwe yona Thumela idatha egciniweyo.

Kwinethiwekhi ye-FTTx, iindlela ezahlukeneyo zokufikelela kwi-ONU nazo zahlukile, njenge-FTTC (Fiber To The Curb): I-ONU ibekwe kwigumbi lekhompyutha eliphakathi loluntu; I-FTTB (Fiber To The Building): I-ONU ibekwe kwikhorido ye-FTTH (Fiber To The Home): I-ONU ibekwe kumsebenzisi wasekhaya.

Yintoni i-ONT?

I-ONT yi-Optical Network Terminal, eyona yunithi yesiphelo se-FTTH, eyaziwa ngokuba yi-"optical modem", efana ne-electric modem ye-xDSL. I-ONT yi-optical network terminal, esetyenziswa kumsebenzisi wokugqibela, ngelixa i-ONU ibhekisa kwiyunithi yenethiwekhi ye-optical, kwaye kunokubakho ezinye iinethiwekhi phakathi kwayo nomsebenzisi wokugqibela. I-ONT yinxalenye ebalulekileyo ye-ONU.

Yintoni ubudlelwane phakathi kwe-ONU kunye ne-OLT?

I-OLT sisiphelo solawulo, kwaye i-ONU sisiphelo; ukusebenza kwenkonzo ye-ONU kukhutshwa nge-OLT, kwaye zombini zikwibudlelwane phakathi kwe-master-slave. Ii-ONU ezininzi zinokudityaniswa kwi-OLT enye nge-splitter.

Yintoni i-ODN?

I-ODN yi-Optical Distribution Network, inethiwekhi yokusasazwa kwe-optical, ngumjelo wokudlulisa optical phakathi kwe-OLT kunye ne-ONU, umsebenzi ophambili kukugqiba ukuhanjiswa kwemiqondiso ye-optical ngeendlela ezimbini, ngokuqhelekileyo ngeentambo ze-optical fiber, izihlanganisi ze-optical, izihluzi ze-optical kunye nokufakelwa ukuqhagamshela ezi. Icandelo lezixhobo ezixhasayo zesixhobo, elona candelo libalulekileyo yi-optical splitter.