Yintoni ubume bothungelwano lweNethiwekhi yokuFikelela kwiOptical (OAN)
Inethiwekhi yokufikelela kwi-Optical (OAN) ibhekisa kusetyenziso lwefiber ebonakalayo njengeyona ndlela iphambili yokuhambisa ukuze kuqatshelwe umsebenzi wothumelo lolwazi womnatha wofikelelo. Iqhagamshelwe kwindawo yenkonzo nge-terminal yelayini yokukhanya (OLT), kwaye iqhagamshelwe kumsebenzisi ngeyunithi yenethiwekhi yamehlo (I-ONU). Uthungelwano lwefiber optical access network lubandakanya izixhobo ezikude-optical network unit and central office equipment-optical line terminal, ezidityaniswe ngezixhobo zothumelo.Amacandelo aphambili enkqubo ngawona.OLTkunye ne-remoteI-ONU.Bagqiba ukuguqulwa kweeprothokholi zomqondiso kwi-interface ye-node yenkonzo (SNI) kwi-interface yomsebenzisi yenethiwekhi (UNI) kuyo yonke inethiwekhi yokufikelela. Isixhobo sofikelelo ngokwaso sikwanesakhono sothungelwano kwaye sinokwenza iindlela ezahlukeneyo zetopology yothungelwano. Kwangaxeshanye, izixhobo zofikelelo nazo zinemisebenzi yogcino lwendawo kunye nokubeka iliso kwindawo esembindini, ukwenza uthungelwano lolawulo lolondolozo ngokusebenzisa transparent optical transmission, nokuluzisa kwiziko lolawulo lomnatha wolawulo olumanyeneyo ngeprotocol yolawulo lwenethiwekhi ehambelanayo.
Indima yeOLTkukubonelela ngojongano phakathi komsebenzi womnatha wofikelelo kunye nolobulalitshintsha, kwaye unxibelelane neyunithi yenethiwekhi ye-optical kwicala lomsebenzisi ngokusebenzisa ukuhanjiswa kwe-optical. Yahlula ngokupheleleyo umsebenzi wokutshintsha kwetshintshaukusuka ukufikelela komsebenzisi. I-terminal ye-optical line ibonelela ngolondolozo kunye nokubeka iliso ngokwayo kunye nesiphelo somsebenzisi. Inokuthi ibekwe ngokuthe ngqo kwi-ofisi yokutshintshiselana ekupheleni kunye notshintshiselwano lwendawo, okanye inokusetwa kwindawo ekude.
Umsebenzi weI-ONUkukubonelela ngojongano lwecala lomsebenzisi kuthungelwano lofikelelo. Inokudibaniswa kwii-terminals ezahlukeneyo zomsebenzisi, kwaye ngexesha elifanayo linomsebenzi wokuguqula i-photoelectric kunye nemisebenzi ehambelanayo yokugcinwa kunye nokubeka iliso. Umsebenzi ophambili weI-ONUkukuphelisa i-fiber optical kwiOLT, cwangcisa umqondiso we-optical kwaye unikeze ujongano lwenkonzo kumashishini amancinci amaninzi, abasebenzisi bamashishini kunye nabasebenzisi beendawo zokuhlala. Ukuphela kwenethiwekhi yeI-ONUlujongano olubonakalayo, kwaye isiphelo salo somsebenzisi lujongano lombane. Ngoko ke,I-ONUinemisebenzi yokuguqula i-optical/electric/optical. Ikwanayo nemisebenzi yedijithali / i-analog kunye ne-analog / idijithali yokuguqulwa kwengxoxo. II-ONUidla ngokubekwa kufutshane nomsebenzisi, kwaye indawo yayo inobubhetyebhetye obukhulu.
I-Optical Access Network (OAN) ihlulwe kwi-Active Optical Network (AON, i-Active Optical Network) kunye ne-Passive Optical Network (i-PON, i-Passive Optica Optical Network) ngokwemigaqo yokusabalalisa inkqubo.
Ubume be-topological bothungelwano lokufikelela kwifiber optical lubhekiselele kulungiselelo lwejometri yemigca yothumelo kunye neenodi. Ibonisa indawo ehambelanayo kunye noqhagamshelo lothungelwano lwenodi nganye kuthungelwano. Isakhiwo se-topological sothungelwano sinempembelelo ebalulekileyo kumsebenzi womnatha, iindleko kunye nokuthembeka. Izakheko ezintathu ezisisiseko ze-topological zezi: zimile okwebhasi, zimile okwesangqa kwaye zimile okwenkwenkwezi. Kule nto, i-bus-star, i-double-star, i-double-ring, ibhasi-ibhasi kunye nezinye iifom zesicelo ezidibeneyo zinokufumaneka. Ngamnye uneempawu zakhe kunye nokuncedisana.