Lub tshuab hluav taws xob (passive optical network) (PON) feem ntau yog tsim los ntawm cov kab kho qhov muag kab (OLT) ntawm chaw ua haujlwm nruab nrab thiab chaw sib txuas haujlwm kho qhov muag (ONU) ntawm tus neeg siv kawg. Nws yog qhov sib kis-sib txuas nrog network nrog hom kev tshaj tawm hauv cov downlink thiab lub sijhawm sib faib ntau yam nkag rau hauv uplink Nws tuaj yeem yoog raws tsob ntoo, lub hnub qub, lub tsheb loj thiab lwm yam ntawm sab saum toj. Tsuas yog yooj yim kho qhov muag cov ntsia hlau uas yuav tsum tau muab nruab ntawm qhov chaw sib txuas ntawm qhov kho qhov muag. Yog li ntawd, nws muaj qhov zoo ntawm kev txuag cov khoom siv hluav taws xob cable, kev siv cov khoom siv bandwidth, txuag cov cuab yeej siv chav nyob, thiab tsim kom muaj qhov zoo ntawm kev siv network nrawm thiab qis tsim kev siv network.
Passive optical network (PON) kuj tseem tuaj yeem raug cais mus rau qhov dav dav passive optical network (BPON), gigabit passive optical network (GPON) thiab Ethernet passive optical network (EPON). Ntawm lawv, gigabit passive optical network (GPON) thiab Ethernet Passive Optical Network (EPON) muaj ntau dua.
Gigabit Passive Optical Network (GPON) yog qhov tseeb tshaj plaws passive optical network (PON) thev naus laus zis. Nws qhov nqes dej ntws tawm tuaj yeem ncav cuag li 2.48 Mbps, tuaj yeem sib koom los ntawm 64 cov neeg siv tag. Ntxiv rau, Gigabit Passive Optical Network (GPON) kuj tseem tuaj yeem txhawb nqa ntau qhov kev cai thiab ua raws li Ethernet, TDM thiab ATM qauv, thiaj li muab cov kev pabcuam kev lag luam ib txwm muaj, xws li TDM-based lub suab thiab tso kab, tsis hloov cov neeg siv khoom Cov.
Cov ntaub ntawv muaj peev xwm | Tus nqi qes qis yog 1.24 Mbps lossis 2.48 Mbps, thiab tus nqi uplink yog 622 Mbps lossis 1.24 Gbps |
Tus naj npawb ntawm cov neeg siv tag | Yog hais tias qhov kev ncua deb ntawm kab hluav taws xob davhlau ya nyob twg (OLT) thiab chav network kho qhov muag (ONU) yog 20 km, nws tuaj yeem txhawb 32 cov neeg siv; Yog tias qhov kev ncua deb li ntawm 12-15 km, 64 cov neeg siv tuaj yeem txhawb nqa; yog hais tias qhov kev ncua deb yog 30 km, tsuas yog 16 cov neeg siv tau txais kev txhawb nqa. |
Txhawb kev raws tu qauv | Ethernet, ATM thiab TDM |
Ethernet Passive Optical Network (EPON) yog lub tshuab passive optical network (PON) raws li Ethernet. Nws siv passive optical network (PON) thev naus laus zis nyob rau ntawm lub cev txheej, thiab siv Ethernet raws tu qauv ntawm qhov txuas txheej los siv passive cov topological qauv ntawm network kho qhov muag (PON) lees paub kev nkag mus ntawm Ethernet. Yog li, Ethernet Passive Optical Network (EPON) ua ke nrog qhov zoo ntawm passive optical network (PON) thev naus laus zis thiab Ethernet thev naus laus zis: tus nqi qis, bandwidth siab, muaj zog scalability, hloov tau yooj yim thiab ceev cov kev pabcuam, thiab kev sib raug zoo nrog Ethernet Kev Sib Tw, thiab lwm yam.
Cov ntaub ntawv muaj peev xwm | Cov nqi nce toj thiab nqes dej yog ob qho tib si 1.25Gbps |
Tus naj npawb ntawm cov neeg siv tag | Thaum qhov kev ncua deb ntawm kho qhov muag kab davhlau ya nyob twg (OLT) thiab chav kho qhov muag (ONU) yog 20 km, qhov siab tshaj ntawm 32 cov neeg siv tau txais kev txhawb nqa |
Txhawb kev raws tu qauv | Ethernet |
Cov khoom siv hluav taws xob nquag siv (cov khoom siv hluav taws xob photoelectric hloov, cov khoom siv optoelectronic, thiab cov khoom siv kho qhov muag, thiab lwm yam) tseem tau xa mus nruab nrab ntawm lub hauv paus chaw ua haujlwm kawg thiab cov neeg siv kawg ntawm cov nquag optical network (AON), uas tuaj yeem faib ua PDH-based thiab SDH-based active xa khoom. Network (AON), lub network kho qhov muag (AON) raws li SDH yog ib txwm siv tam sim no. Nws muaj tus nqi nkag tau mus los ntawm 155Mbs lossis 622Mbs, thiab qhov sib kis tau ntev mus txog 70 km yam tsis muaj dua daim. Sib txawv ntawm qhov ntsuas kub (passive optical network) (PON), cov teeb liab tau txais los ntawm cov khoos phis tawj network (ONU) hauv cov nquag kho qhov muag network (AON) yog cov teeb liab tom qab kho qhov muag-hluav taws xob-kho qhov muag ntawm lub tshuab ua kom nquag plias. Kev nquag optical network (AON) thev naus laus zis yog qhov paub tab heev, tab sis nws cov nqi xa tawm yog siab dua qhov ntawm qhov passive optical network (PON).
Passive optical network (PON) thiab cov nquag optical network (AON) muaj lawv tus kheej cov yam ntxwv. Tam sim no, passive optical network (PON) muaj ntau dua nyob rau hauv fiber ntau rau tsev (FTTH) network.