I-PON ibhekisela kunethiwekhi ye-fiber optical fibre, okuyindlela ebalulekile ukuze kuqhutshekwe nezinsiza zenethiwekhi yokufinyelela ku-broadband.
Ubuchwepheshe be-PON baqala ngo-1995. Kamuva, ngokusho komehluko phakathi kwesendlalelo sokuxhumanisa idatha nesendlalelo esibonakalayo, ubuchwepheshe be-PON bahlukaniswa kancane kancane ku-APON, EPON, ne-GPON. Phakathi kwabo, ubuchwepheshe be-APON buye baqedwa yimakethe ngenxa yezindleko zayo eziphakeme kanye nomkhawulokudonsa ophansi.
1, i-EPON
Ubuchwepheshe be-PON obusekelwe ku-Ethernet. Yamukela ukwakheka kwe-point-to-multipoint kanye nokudluliswa kwe-fiber optical passive ukuhlinzeka ngezinsizakalo eziningi ku-Ethernet. Ubuchwepheshe be-EPON bulinganiswa yiqembu elisebenzayo le-IEEE802.3 EFM. Kuleli zinga, ubuchwepheshe be-Ethernet kanye ne-PON buyahlanganiswa, ubuchwepheshe be-PON busetshenziswa ongqimbeni olubonakalayo, iphrothokholi ye-Ethernet isetshenziswa ungqimba lwesixhumanisi sedatha, kanti i-PON topology isetshenziselwa ukubona ukufinyelela kwe-Ethernet.
Izinzuzo zobuchwepheshe be-EPON yizindleko eziphansi, umkhawulokudonsa ophezulu, ukukala okuqinile, ukuhambisana ne-Ethernet ekhona, nokuphatha okulula.
Amamojula avamile we-EPON optical emakethe yilawa:
(1) I-EPONOLTI-PX20+/PX20++/PX20+++ optical module, ilungele iyunithi yenethiwekhi ye-optical kanye ne-optical line terminal, ibanga layo lokudlulisela liyi-20KM, imodi eyodwa, isikhombimsebenzisi se-SC, i-DDM yokusekela.
(2) 10G EPONI-ONUI-SFP + optical module, ilungele iyunithi yenethiwekhi ye-optical kanye nesiphetho somugqa wokukhanya. Ibanga lokudlulisela lingu-20KM, imodi eyodwa, isikhombimsebenzisi se-SC, nokusekelwa kwe-DDM.
I-10G EPON ingahlukaniswa ngezigaba ezimbili ngokuya ngesilinganiso: imodi ye-asymmetric kanye nemodi yokulinganisa. Izinga le-downlink ephansi yemodi ye-asymmetric ngu-10Gbit/s, izinga lokukhuphuka kwe-uplink ngu-1Gbit/s, futhi izinga lokuxhumanisa phezulu nelokwehlisa lemodi ye-symmetric kokubili ngu-10Gbit/s.
2, GPON
I-GPON yahlongozwa okokuqala yinhlangano ye-FSAN ngoSepthemba 2002. Ngalesi sisekelo, i-ITU-T yaqeda ukwakhiwa kwe-ITU-T G.984.1 kanye ne-G.984.2 ngo-March 2003, futhi yaqeda i-G.984.1 kanye ne-G.984.2 ngoFebhuwari nangoJuni. 2004. 984.3 ukumiswa. Ngakho ekugcineni wakha umndeni ojwayelekile we-GPON.
Ubuchwepheshe be-GPON yisizukulwane sakamuva sezinga lokufinyelela elihlanganisiwe le-broadband passive optical elisekelwe ezingeni le-ITU-TG.984.x. Inezinzuzo eziningi ezifana nomkhawulokudonsa ophezulu, ukusebenza kahle okuphezulu, ukumbozwa okukhulu, izixhumanisi zabasebenzisi abacebile, futhi ithathwa abaningi opharetha njengokuqaphela Ubuchwepheshe obufanele bezinsizakalo zenethiwekhi yokufinyelela kwe-broadband kanye noguquko oluphelele.
Amamojula ajwayelekile we-GPON optical emakethe yilawa:
(1) I-GPONOLTI-CLASS C+/C++/C+++ optical module, ilungele ukuphela komugqa, ibanga layo lokudlulisela liyi-20KM, izinga lingu-2.5G/1.25G, imodi eyodwa, isikhombimsebenzisi se-SC, i-DDM yokusekela.
(2) I-GPONOLTI-CLASS B + optical module, ilungele ukuphela komugqa wokukhanya, ibanga layo lokudlulisela liyi-20KM, isivinini ngu-2.5G/1.25G, imodi eyodwa, isikhombimsebenzisi se-SC, i-DDM yokusekela.
