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 ye-optical network (ONU).Inethiwekhi ye-fiber optical access ibandakanya izixhobo ezikude-iyunithi yenethiwekhi ye-optical kunye ne-ofisi ephakathi izixhobo-i-terminal ye-optical line, edityaniswe ngezixhobo zokuhambisa.I-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 ekude, ukwenza uthungelwano lolawulo lolondolozo ngokusebenzisa transparent optical transmission, nokuluzisa kwiziko lolawulo lomnatha wolawulo olumanyeneyo ngeprotocol yolawulo lwenethiwekhi ehambelanayo.
Indima ye-OLT kukubonelela nge-interface phakathi kwenethiwekhi yokufikelela kunye nokutshintsha kwendawo, kunye nokunxibelelana neyunithi yenethiwekhi ye-optical kwicala lomsebenzisi ngokusebenzisa ukuhanjiswa kwe-optical.Ikwahlula ngokupheleleyo umsebenzi wokutshintsha utshintshi ukusuka ekufikeleleni 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 we-ONU kukubonelela 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 oyintloko we-ONU kukuphelisa i-fiber optical evela kwi-OLT, inkqubo yesignali ye-optical kunye nokubonelela nge-interfaces yenkonzo kumashishini amancinci amaninzi, abasebenzisi bezoshishino kunye nabasebenzisi beendawo zokuhlala.Ukuphela kwenethiwekhi ye-ONU yi-interface ye-optical, kwaye isiphelo somsebenzisi sisixhobo sombane.Ngoko ke, i-ONU inemisebenzi yokuguqula i-optical / yombane kunye nombane / i-optical.Ikwanayo nemisebenzi yedijithali / i-analog kunye ne-analog / idijithali yokuguqulwa kwengxoxo.I-ONU ihlala ibekwe kufutshane nomsebenzisi, kwaye indawo yayo inokuguquguquka okukhulu.
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.