ʻO ka PON e pili ana i kahi pūnaewele fiber optical passive, kahi ala koʻikoʻi no ka lawe ʻana i nā lawelawe ʻoihana ākea ākea.
Ua hoʻomaka ʻia ka ʻenehana PON i ka makahiki 1995. Ma hope mai, e like me ka ʻokoʻa ma waena o ka pae loulou data a me ka papa kino, ua hoʻokaʻawale ʻia ka ʻenehana PON i APON, EPON, a me GPON.I waena o lākou, ua hoʻopau ʻia ka ʻenehana APON e ka mākeke ma muli o kona kumukūʻai kiʻekiʻe a me ka bandwidth haʻahaʻa.
1、EPON
ʻenehana PON e pili ana i ka Ethernet.Hoʻohana ia i ka hoʻolālā point-to-multipoint a me ka passive optical fiber transmission e hāʻawi i nā lawelawe he nui ma Ethernet.Hoʻonohonoho ʻia ka ʻenehana EPON e IEEE802.3 EFM hui hana.Ma kēia maʻamau, hoʻohuiʻia nāʻenehana Ethernet a me PON, hoʻohanaʻia kaʻenehana PON i ka papa kino, hoʻohanaʻia ka protocol Ethernet i ka papa loulouʻikepili, a hoʻohanaʻia ka topology PON eʻike i ke komoʻana o Ethernet.
ʻO nā mea maikaʻi o ka ʻenehana EPON he haʻahaʻa haʻahaʻa, bandwidth kiʻekiʻe, scalability ikaika, kūpono me ka Ethernet i loaʻa, a me ka hoʻokele maʻalahi.
ʻO nā modula optical EPON maʻamau ma ka mākeke:
(1) EPON OLT PX20+/PX20++/PX20+++ optical module, kūpono no ka ʻāpana pūnaewele optical a me ka laina laina laina, ʻo kona mamao hoʻouna ʻo 20KM, hoʻokahi-mode, SC interface, kākoʻo DDM.
(2) 10G EPON ONU SFP + optical module, kūpono no ka ʻāpana pūnaewele optical a me ka laina laina laina.ʻO ka mamao o ka hoʻounaʻana he 20KM, hoʻokahi mode, SC interface, a me ke kākoʻo DDM.
Hiki ke hoʻokaʻawale ʻia ʻo 10G EPON i ʻelua mau ʻāpana e like me ka helu: ke ʻano asymmetric a me ke ʻano symmetric.ʻO ka helu downlink o ke ʻano asymmetric he 10Gbit/s, ʻo ka uplink rate he 1Gbit/s, a ʻo ka uplink a me ka downlink rate o ka symmetric mode ʻelua 10Gbit/s.
2、GPON
Ua noi mua ʻia ʻo GPON e ka hui FSAN i Kepakemapa 2002. Ma kēia kumu, ua hoʻopau ʻo ITU-T i ka hoʻokumu ʻana o ITU-T G.984.1 a me G.984.2 i Malaki 2003, a ua hoʻopau iā G.984.1 a me G.984.2 i Pepeluali a me Iune. 2004. 984.3 hoʻohālikelike.No laila ua hoʻokumu ʻia ka ʻohana maʻamau o GPON.
ʻO ka ʻenehana GPON ka hanauna hou loa o ka broadband passive optical integrated access standard ma muli o ke kūlana ITU-TG.984.x.Loaʻa iā ia nā pono he nui e like me ka bandwidth kiʻekiʻe, ka hana kiʻekiʻe, ka uhi nui, nā mea hoʻohana waiwai, a manaʻo ʻia e ka hapa nui o nā mea hoʻohana e like me ka ʻike ʻana ʻO ka ʻenehana kūpono no nā lawelawe ʻoihana ākea ākea a me ka hoʻololi piha.
ʻO nā modules optical GPON maʻamau ma ka mākeke:
(1) GPON OLT CLASS C +/C++/C+++ optical module, kūpono no ka laina laina laina, ʻo 20KM ka mamao o ka lawe ʻana, ʻo 2.5G / 1.25G ka helu, hoʻokahi mode, SC interface, kākoʻo DDM.
(2) GPON OLT CLASS B + optical module, kūpono no ka laina laina laina, ʻo 20KM ka mamao o ka lawe ʻana, ʻo 2.5G / 1.25G ka wikiwiki, hoʻokahi mode, SC interface, kākoʻo DDM.
