OLTiyitheminali yomugqa optical,I-ONUiyunithi yenethiwekhi yokubona (I-ONU), zonke ziyimishini yokuxhuma inethiwekhi yokudlulisa amehlo. Kungamamojula amabili adingekayo ku-PON: I-PON (Inethiwekhi ye-Passive Optical: inethiwekhi yokubona engenzi lutho). I-PON (inethiwekhi ye-passive optical) ibhekisela ku-(inethiwekhi yokusabalalisa optical) ayiqukethe noma yiziphi izisetshenziswa zikagesi namandla kagesi, i-ODN yakhiwe ngamadivayisi angenzi lutho njenge-optical splitter (Splitter), ayidingi imishini kagesi esebenzayo ebizayo. Inethiwekhi ye-passive optical ihlanganisa itheminali yomugqa obonakalayo (OLT) efakwe esiteshini sokulawula esimaphakathi, kanye nenqwaba yamayunithi enethiwekhi optical asekelayo (Ama-ONU) efakwe endaweni yomsebenzisi. Inethiwekhi yokusabalalisa ebonakalayo (ODN) phakathi kwe-OLTfuthiI-ONUiqukethe imicu yokubona kanye nezihlukanisi ezingenzi lutho noma ama-couplers.
Amaruthafuthiamaswishiimishini yokushintshanisa idatha.
I-ODN (Optical Distribution Network) iyinethiwekhi yekhebula ye-FTTH esekelwe kumishini ye-PON. Indima yayo ukuhlinzeka ngesiteshi sokudlulisa amehlo phakathi kweOLTkanye neI-ONU. Ngokombono wokusebenza, i-ODN ingahlukaniswa ibe izingxenye ezine: i-subsystem yekhebula ye-feeder optical, i-subsystem yekhebula yokusabalalisa, i-subsystem yekhebula yangaphakathi ye-optical cable kanye ne-subsystem ye-fiber optical terminal kusukela ekupheleni kwehhovisi kuya ekugcineni komsebenzisi.
I-ONT iyingxenye ebalulekile yeI-ONU.
I-FTTB “fiber optical to the building”, 16Ama-ONUzibekwe ebhokisini leyunithi ephaseji. Kukhona 16 ONTs kuI-ONU. I-ONT ngayinye ikhipha ikhebuli yenethiwekhi (isignali kagesi) futhi ifinyelela ekugcineni komsebenzisi ngamunye ngentambo yenethiwekhi ephaseji.
I-FTTH “fiber-to-the-home”, ibeka isihlukanisi esingu-1 kuye ku-16 ebhokisini leyunithi emhubheni, bese ifinyelela kumsebenzisi ngamunye ngefayibha emboziwe ephaseji, futhi umsebenzisi ngamunye unqamula i-ONT. Kufana nokudiliza i-I-ONU, ukuze okokusebenza kwetheminali kusondele kakhulu kumsebenzisi.
I-ONT ingaqondwa njenge-I-ONUenechweba elilodwa kuphela.