Siyini isakhiwo senethiwekhi ye-Optical Access Network (OAN)
I-Optical access network (OAN) ibhekisela ekusetshenzisweni kwe-optical fibre njengendlela yokudlulisa eyinhloko ukuze kuqashwe umsebenzi wokudlulisa ulwazi wenethiwekhi yokufinyelela.Ixhunywe ku-node yesevisi ngokusebenzisa i-terminal optical line (OLT), futhi ixhunywe kumsebenzisi ngeyunithi yenethiwekhi yokubona (ONU).Inethiwekhi yokufinyelela i-fiber optical ihlanganisa iyunithi yenethiwekhi ye-remote-optical network kanye ne-central office equipment-optical line terminal, exhunywe ngemishini yokudlulisela.Izingxenye eziyinhloko zesistimu yi-OLT futhi zikudeI-ONU.Baqedela ukuguqulwa kwamaphrothokholi okusayina kusuka kusixhumi esibonakalayo se-service node (SNI) kuya ku-interface yenethiwekhi yomsebenzisi (UNI) kuyo yonke inethiwekhi yokufinyelela.Idivayisi yokufinyelela ngokwayo nayo inamakhono okuxhumana futhi ingakha izinhlobo ezihlukahlukene ze-topology yenethiwekhi.Ngesikhathi esifanayo, izinto zokufinyelela nazo zinemisebenzi yokunakekelwa kwendawo kanye nokuqapha okuphakathi nendawo, ukwakha inethiwekhi yokuphatha ukulungiswa ngokudluliswa kwe-optical transparent, nokuyiletha esikhungweni sokuphatha inethiwekhi yokuphatha okuhlangene ngokusebenzisa iphrothokholi yokuphatha inethiwekhi ehambisanayo.
Iqhaza le-OLT ukuhlinzeka ngesixhumi esibonakalayo phakathi kwenethiwekhi yokufinyelela kanye nokushintsha kwendawo, kanye nokuxhumana neyunithi yenethiwekhi yokubona ngasohlangothini lomsebenzisi ngokudluliswa kwe-optical.Ihlukanisa ngokuphelele umsebenzi wokushintsha wokushintsha ekufinyeleleni komsebenzisi.Itheminali ye-optical line inikeza ukunakekelwa nokuqapha yona kanye nesiphetho somsebenzisi.Ingabekwa ngokuqondile ekugcineni kwehhovisi lokushintshisana kanye nokushintshisana kwendawo, noma ingasethwa ekugcineni okukude.
Umsebenzi we-ONU ukuhlinzeka ngesixhumi esibonakalayo sohlangothi lomsebenzisi senethiwekhi yokufinyelela.Ingaxhunywa kumatheminali ahlukahlukene wabasebenzisi, futhi ngesikhathi esifanayo inomsebenzi wokuguqula isithombe sikagesi kanye nemisebenzi ehambisanayo yokugcinwa nokuqapha.Umsebenzi oyinhloko we-ONU ukunqamula i-fiber optical kusuka ku-OLT, ukucubungula isignali ye-optical kanye nokuhlinzeka ngokuxhumana kwesevisi kumabhizinisi amancane amaningi, abasebenzisi bebhizinisi nabasebenzisi bezindawo zokuhlala.Ukuphela kwenethiwekhi ye-ONU kuyisixhumi esibonakalayo esibonakalayo, futhi isiphetho saso somsebenzisi siyisixhumi esibonakalayo sikagesi.Ngakho-ke, i-ONU inemisebenzi yokuguqula i-optical/electric and electric/optical.Iphinde ibe nemisebenzi yedijithali/i-analogi kanye nokuguqulwa kwe-analogi/yedijithali kwengxoxo.I-ONU ivamise ukubekwa eduze nomsebenzisi, futhi indawo yayo inokuguquguquka okukhulu.
I-Optical Access Network (OAN) ihlukaniswe yaba yi-Active Optical Network (AON, Active Optical Network) kanye ne-Passive Optical Network (PON, Passive Optica Optical Network) ngokuya ngokusabalalisa uhlelo.
Isakhiwo se-topological senethiwekhi yokufinyelela i-fiber optical sibhekisela ekuhlelweni kwejometri yemigqa yokudlulisela kanye namanodi.Ibonisa ukuma okuhlangene kanye nesakhiwo sokuxhumana senodi ngayinye kunethiwekhi.Isakhiwo se-topological senethiwekhi sinethonya elibalulekile emsebenzini wenethiwekhi, izindleko nokuthembeka.Izakhiwo ezintathu eziyisisekelo ze-topological yilezi: okumise okwebhasi, okumise okwendandatho nokumise okwenkanyezi.Kulokhu, inkanyezi yebhasi, inkanyezi ephindwe kabili, i-double-ring, ibhasi-ibhasi namanye amafomu okufaka isicelo ahlanganisiwe angatholakala.Ngayinye inezici zayo kanye nesengezo esihambisanayo.