E tohu ana te PON ki te whatunga muka whatu hāngū, he huarahi nui mo te kawe i nga ratonga whatunga uru aunui.
Ko te hangarau PON i puta mai i te 1995. I muri mai, i runga i te rereketanga i waenga i te paparanga hononga raraunga me te paparanga tinana, ka wehewehea te hangarau PON ki te APON, EPON, me te GPON.I roto ia ratou, kua whakakorehia te hangarau APON e te maakete na te utu nui me te iti o te bandwidth.
1, EPON
Hangarau PON-a-Itarangi.Ka tango i te hanganga tohu-ki-maha me te tuku muka whatu hāngū ki te whakarato ratonga maha i runga i te Ethernet.Ko te hangarau EPON kua whakatauhia e te roopu mahi IEEE802.3 EFM.I roto i tenei paerewa, ka whakakotahihia nga hangarau Ethernet me te PON, ka whakamahia te hangarau PON i roto i te paparanga tinana, ka whakamahia te kawa Ethernet i roto i te paparanga hononga raraunga, ka whakamahia te topology PON ki te mohio ki te uru o Ethernet.
Ko nga painga o te hangarau EPON he iti te utu, he nui te bandwidth, he kaha tauine, he hototahi ki te Ethernet o naianei, me te whakahaere ngawari.
Ko nga waahanga whakaata EPON noa i runga i te maakete ko:
(1) EPON OLT PX20+/PX20++/PX20+++ kōwae whatu, e tika ana mō te kōwae whatunga whatu me te kāpeka raina whatu, tona tawhiti tuku ko 20KM, kotahi-aratau, atanga SC, tautoko DDM.
(2) 10G EPON ONU SFP + kōwae whatu, e tika ana mō te kōwae whatunga whatu me te kāpeka raina whatu.Ko te tawhiti tuku ko te 20KM, te aratau kotahi, te atanga SC, me te tautoko DDM.
Ka taea te wehea te 10G EPON ki nga waahanga e rua kia rite ki te reiti: aratau hangarite me te aratau hangarite.Ko te reiti whakararo o te aratau hangarite he 10Gbit/s, ko te reiti hono whakarunga ko te 1Gbit/s, a ko te reiti hono me te heke o te aratau hangarite he 10Gbit/s.
2, GPON
Ko te GPON te tuatahi i tonohia e te whakahaere FSAN i te marama o Hepetema 2002. I runga i tenei kaupapa, ka oti te hanganga o ITU-T G.984.1 me te G.984.2 i te Maehe 2003, ka oti te G.984.1 me te G.984.2 i te Hui-tanguru me Hune. 2004. 984.3 te whakarite paerewa.Na te mutunga i hanga te whanau paerewa o GPON.
Ko te hangarau GPON te reanga hou o te paerewa urunga whakauru whatu whanui whanui i runga i te paerewa ITU-TG.984.x.He maha nga painga penei i te bandwidth teitei, te kaha nui, te kapinga nui, te whai rawa o nga atanga kaiwhakamahi, a ka whakaarohia e te nuinga o nga kaiwhakahaere he tino mohio Ko te hangarau pai mo nga ratonga whatunga uru whanui me te panoni matawhānui.
Ko nga waahanga whakaata GPON noa i runga i te maakete ko:
(1) GPON OLT CLASS C +/C++/C+++ kōwae whatu, e tika ana mo te kāpeka raina whatu, tona tawhiti tuku ko 20KM, auau ko 2.5G / 1.25G, aratau kotahi, atanga SC, tautoko DDM.
(2) GPON OLT CLASS B + kōwae whatu, e tika ana mo te kāpeka raina whatu, tona tawhiti tuku ko 20KM, tere ko 2.5G / 1.25G, aratau kotahi, atanga SC, tautoko DDM.
