Me ka hoʻomau mau ʻana o ke kūkulu ʻana i ka ʻoihana pūnaewele kiʻekiʻe a me ka pono e kūkulu i kahi ola akamai kikohoʻe e pili ana i ka hiki ʻana o ka pūnaewele "ʻekolu gigabit", pono nā mea hoʻohana i nā mamao hoʻouna lōʻihi, nā bandwidth kiʻekiʻe, ʻoi aku ka hilinaʻi ikaika a me nā uku hana ʻoihana haʻahaʻa (OPEX), a Kākoʻo ʻo GPON i nā hana he nui e hoʻokō i nā pono o ka mea kūʻai aku.
He aha ka GPON?
ʻO GPON ka pōkole o Gigabit Passive Optical Network, i wehewehe ʻia e ka ITU-T manaʻo ʻōlelo G.984.1 a i G.984.6. ʻAʻole hiki i ka GPON ke hoʻouna i ka Ethernet wale nō, akā ʻo ATM a me TDM (PSTN, ISDN, E1 a me E3) kaʻa. ʻO kāna hiʻohiʻona nui ka hoʻohana ʻana i nā mea hoʻokaʻawale passive i loko o ka pūnaewele hoʻolaha fiber optical, me kahi mekanikini komo point-to-multipoint, e hoʻohana i hoʻokahi fiber optical e komo mai ana mai ke kikowaena o ka mea hoʻolako pūnaewele e lawelawe i nā hale he nui a me nā mea hoʻohana liʻiliʻi.
GPON, EPON a me BPON
EPON (Ethernet Passive Optical Network) a me GPON he mau manaʻo like loa. ʻO lāua nā pūnaewele PONʻelua a hoʻohanaʻelua i nā kaula opitika a me ka frequency optical like. A ʻo BPON (Broadband Passive Optical Network) a me GPON he mea like loa. Hoʻohana lāua i nā fiber optical a hiki ke hāʻawi i nā lawelawe no 16 a 32 mau mea hoʻohana. ʻO ka ʻōlelo kikoʻī BPON ma hope o ITU-T G983.1, a ʻo GPON ma hope o ITU-T G984.1. I ka hoʻomaka ʻana o nā noi PON, ʻo BPON ka mea kaulana loa.
Ua kaulana loa ʻo GPON i ka mākeke fiber optical. Ma waho aʻe o kāna ʻenehana kiʻekiʻe, loaʻa iā ia nā pōmaikaʻi penei:
1.Range: Hiki i ka fiber mode hoʻokahi ke hoʻouna i nāʻikepili mai ka 10 a hiki i ka 20 mau kilomita,ʻoiaiʻo nā kaula keleawe maʻamau i kaupalenaʻia i kahi o 100 mika.
2.Speed: ʻO ka wikiwiki o ka hoʻouna ʻana i lalo o EPON e like me kona upstream rate, ʻo ia ka 1.25 Gbit / s, ʻoiai ʻo ka downstream transmission rate o GPON he 2.48 Gbit / s.
3.Security: Ma muli o ka hoʻokaʻawale ʻana o nā hōʻailona ma ka fiber optical, ʻo GPON kahi ʻōnaehana palekana. No ka mea ua hoʻouna ʻia lākou i loko o kahi kaapuni paʻa a loaʻa i ka hoʻopunipuni, ʻaʻole hiki ke hack a paʻi ʻia ʻo GPON.
4.Affordability: ʻOi aku ka liʻiliʻi o nā kaula fiber optic GPON ma mua o nā kaula LAN keleawe, a hiki nō hoʻi ke pale i ka hoʻokomo ʻana i ka wili a me nā lako uila pili, a laila e mālama ai i nā kumukūʻai.
5.Energy saving: Kū'ē i ke kaula keleawe maʻamau i ka hapa nui o nā pūnaewele, ua hoʻonuiʻia ka ikaika o ka GPON e 95%. Ma waho aʻe o ka maikaʻi, hāʻawi pū ka gigabit passive optical networks i kahi hopena haʻahaʻa haʻahaʻa e hiki ai ke hoʻonui i nā mea hoʻohana ma o nā splitters, i kaulana loa i nā wahi ākea.