Nrog rau kev txhim kho txuas ntxiv ntawm kev tsim kho kev lag luam siab thiab xav tau los tsim kom muaj lub neej ntse digital raws li "peb gigabit" network muaj peev xwm, cov neeg ua haujlwm xav tau kev sib kis ntev dua, bandwidths siab dua, muaj kev ntseeg tau zoo thiab kev lag luam qis dua (OPEX), thiab GPON txhawb ntau lub zog kom tau raws li cov neeg siv khoom xav tau.
GPON yog dab tsi?
GPON yog cov ntawv luv ntawm Gigabit Passive Optical Network, txhais los ntawm ITU-T cov lus pom zoo series G.984.1 txog G.984.6.GPON tuaj yeem xa tsis tau tsuas yog Ethernet xwb, tab sis kuj ATM thiab TDM (PSTN, ISDN, E1 thiab E3) kev khiav tsheb.Nws lub ntsiab feature yog kev siv cov passive splitters nyob rau hauv lub optical fiber faib network, nrog ib tug point-to-multipoint access mechanism, siv ib tug incoming optical fiber los ntawm qhov chaw nruab nrab ntawm lub network muab kev pab rau ntau tsev neeg thiab cov neeg siv lag luam me.
GPON, EPON thiab BPON
EPON (Ethernet Passive Optical Network) thiab GPON muaj cov ntsiab lus zoo sib xws.Lawv yog ob qho tib si PON tes hauj lwm thiab ob qho tib si siv optical cables thiab tib lub qhov muag zaus.Tus nqi ntawm ob lub tes hauj lwm nyob rau hauv cov kev taw qhia txog dej yog kwv yees li 1.25 Gbits / s.Thiab BPON (Broadband Passive Optical Network) thiab GPON kuj zoo sib xws.Lawv ob leeg siv optical fibers thiab tuaj yeem muab kev pabcuam rau 16 txog 32 tus neeg siv.BPON specification ua raws li ITU-T G983.1, thiab GPON ua raws li ITU-T G984.1.Thaum PON daim ntawv thov pib pib, BPON yog qhov nrov tshaj plaws.
GPON yog qhov nrov heev hauv kev lag luam fiber ntau optical.Ntxiv nrog rau nws cov thev naus laus zis siab heev, nws tseem muaj cov txiaj ntsig hauv qab no:
1.Range: Ib hom fiber ntau tuaj yeem xa cov ntaub ntawv los ntawm 10 mus rau 20 mais, thaum cov khoom siv tooj liab feem ntau txwv rau ntau yam ntawm 100 meters.
2.Speed: Lub downstream kis tus nqi ntawm EPON yog tib yam li nws upstream tus nqi, uas yog 1.25 Gbit / s, thaum lub downstream kis tus nqi ntawm GPON yog 2.48 Gbit / s.
3.Security: Vim muaj kev sib cais ntawm cov teeb liab nyob rau hauv optical fiber, GPON yog qhov tseem ceeb ntawm kev nyab xeeb.Vim tias lawv kis tau nyob rau hauv lub kaw lus kaw thiab muaj encryption, GPON tsis tuaj yeem raug nyiag los yog tapping.
4.Affordability: GPON fiber optic cables pheej yig dua li tooj liab LAN cables, thiab tseem tuaj yeem zam kev nqis peev hauv kev xaim thiab lwm yam khoom siv hluav taws xob, yog li txuag nqi.
5.Kev txuag hluav taws xob: Contrary to the standard tooj liab hlau nyob rau hauv feem ntau tes hauj lwm, lub zog efficiency ntawm GPON yog nce los ntawm 95%.Ntxiv nrog rau kev ua tau zoo, gigabit passive optical tes hauj lwm tseem muab cov kev daws teeb meem qis uas tuaj yeem ua rau cov neeg siv ntau ntxiv los ntawm cov splitters, uas yog nrov heev hauv thaj chaw muaj neeg coob.