He aha ka GPON?
ʻO ka ʻenehana GPON (Gigabit-Capable PON) ka hanauna hou loa o ka broadband passive optical integrated access standard e pili ana i ka maʻamau ITU-TG.984.x. Loaʻa iā ia nā pono he nui e like me ka bandwidth kiʻekiʻe, ka hana kiʻekiʻe, ka uhi nui, ka mea hoʻohana waiwai, a me nā mea ʻē aʻe.
Ua noi mua ʻia ʻo GPON e ka hui FSAN i Kepakemapa 2002. Ma muli o kēia, ua hoʻopau ʻo ITU-T i ka hoʻomohala ʻana o ITU-T G.984.1 a me G.984.2 i Malaki 2003, a hoʻopau iā G. i Pepeluali a me Iune 2004. . No laila, ua hoʻokumu ʻia ka ʻohana maʻamau o GPON.
ʻO ke ʻano kumu o ka hāmeʻa e pili ana i ka ʻenehana GPON e like me ka PON e kū nei. ʻO ia hoʻi kaOLT(ka laina laina optika) o ke keena kikowaena, ka ONT/ONUo ka hopena o ka mea hoʻohana (ke kikowaena pūnaewele optical a i ʻole ka ʻāpana pūnaewele optical), a ua hoʻopili ʻia nā mea ʻelua ʻelua ma ke ʻano hoʻokahi. ʻO ka fiber optical (SM fiber) a me ka passive splitter (Splitter) i haku ʻia me kahi ODN (Optical Distribution Network) a me kahi ʻōnaehana hoʻokele pūnaewele.
No nā kūlana PON'ē aʻe, hāʻawi ka GPON maʻamau i ka bandwidth kiʻekiʻe loa me ka downlink rate a hiki i ka 2.5 Gbit / s, a ʻoi aku ka maikaʻi o kāna mau hiʻohiʻona asymmetric no ka mākeke lawelawe data broadband. a/a i ʻole nā papa GEM. Loaʻa iā ia ka pae lawelawe maikaʻi, 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 8 kHz (125 μs) ke kākoʻo pololei i nā lawelawe TDM. Ma ke ʻano he maʻamau ʻenehana kaʻa lawe, hōʻike pū ʻo GPON i nā mīkini pale a hoʻopau i nā hana OAM ma ka pae pūnaewele hiki.
Ma ke kūlana GPON, ua wehewehe maopopo ʻia nā ʻano lawelawe e pono ai ke kākoʻo: nā lawelawe data (nā lawelawe Ethernet, me nā lawelawe IP a me nā kahawai wikiō MPEG), nā lawelawe PSTN (POTS, ISDN lawelawe), a me nā laina i hoʻolaʻa ʻia (T1, E1, DS3, E3, a me nā lawelawe ATM). ) a me nā lawelawe wikiō (kiʻi wikiō). Hoʻopaʻa ʻia nā lawelawe lehulehu ma GPON i nā kelepona ATM a i ʻole nā kiʻi GEM no ka hoʻouna ʻana, e hāʻawi ana i nā hōʻoia QoS kūpono no nā ʻano lawelawe like ʻole.