He aha ka GPON?
ʻO ka ʻenehana GPON (Gigabit-Capable PON) ka hanauna hou loa o ka broadband passive optical integrated access standard ma muli o ke kūlana ITU-TG.984.x.He nui kona mau pono e like me ka bandwidth kiʻekiʻe, ka hana kiʻekiʻe, ka uhi nui, a me nā mea hoʻohana waiwai.Manaʻo ka hapa nui o nā mea hoʻohana he ʻenehana kūpono e ʻike ai i ka broadband a me ka hoʻololi piha ʻana o nā lawelawe pūnaewele ʻike.
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 ke ʻano kumu o nā lako e pili ana i ka ʻenehana GPON e like me ka PON e kū nei.Hoʻokumu pū ʻia ʻo ia me OLT (optic line terminal) ma ke keʻena kikowaena a me ONT/ONU (optic network terminal a i kapa ʻia ʻo optical network unit) ma ka ʻaoʻao mea hoʻohana.ʻO ODN (Optical Distribution Network) i haku ʻia me SM fiber a me passive splitter (Splitter) a me kahi ʻōnaehana hoʻokele pūnaewele.
No nā kūlana PON ʻē aʻe, hāʻawi ka maʻamau GPON i ka bandwidth kiʻekiʻe i ʻike ʻole ʻia, me ke kahe o lalo a hiki i 2.5Gbit / s, a hiki i kona mau hiʻohiʻona asymmetric ke hoʻololi maikaʻi i ka mākeke lawelawe data broadband.Hāʻawi ia i ka hōʻoia piha o ka QoS, a lawe i nā keena ATM a (a i ʻole) GEM i ka manawa like.Loaʻa iā ia ka mana maikaʻi e hāʻawi i nā pae lawelawe, kākoʻo i ka hōʻoia QoS a me ke komo ʻana i ka lawelawe piha.I ka lawe ʻana i nā kiʻi GEM, hiki ke hoʻopaʻa ʻia nā lawelawe TDM i nā kiʻi GEM, a hiki i nā kiʻi maʻamau 8kHz (125μs) ke kākoʻo pololei i nā lawelawe TDM.Ma ke ʻano he maʻamau ʻenehana pae kelepona, hōʻike pū ʻo GPON i ka mīkini pale a hoʻopau i nā hana OAM ma ka pae o ka ʻoihana.
Ma ke kūlana GPON,ʻo nāʻano o nā lawelawe e pono e kākoʻoʻia me nā lawelaweʻikepili (nā lawelawe Ethernet, me nā lawelawe IP a me nā kahawai wikiō MPEG), nā lawelawe PSTN (POTS, nā lawelawe ISDN), nā laina i hoʻolaʻaʻia (T1, E1, DS3, E3, a me nā lawelawe ATM).) A me nā lawelawe wikiō (kiʻi wikiō).Hoʻopili ʻia nā lawelawe lehulehu ma GPON i nā kelepona ATM a i ʻole nā kiʻi GEM no ka hoʻouna ʻana, hiki ke hāʻawi i nā hōʻoia QoS kūpono no nā ʻano lawelawe like ʻole.