ABC ntawm PON: To taub OLT, ONU, ONT thiab ODN
Nyob rau hauv xyoo tas los, Fiber rau lub tsev (FTTH) tau pib siv los ntawm cov tuam txhab kev sib txuas lus thoob plaws ntiaj teb, thiab kev siv cuab yeej ua haujlwm tau tsim kho sai heev. Muaj ob qho tseem ceeb ntawm cov tshuab uas ua rau FTTH broadband txuas tau. Cov no yog cov nquag optical tes hauj lwm (AON) thiab kev pom zoo cov kev sib txuas lus tes hauj lwm (PON). Los ntawm deb ntawm feem ntau ntawm FTTH kev xa tawm hauv kev npaj thiab hauv kev siv lub tshuab PON kom txuag tau cov nqi hluav taws xob. PON tau nyuam qhuav nyiam ntau xim vim nws cov nqi qis thiab kev ua haujlwm siab. Hauv no ncej, peb tab tom yuav ua kom paub cov ABC ntawm PON uas feem ntau ua nrog cov qauv thiab cov tshuab txuas nrog, xws li OLT, ONT, ONU thiab ODN.
Ua ntej tshaj, nws yog ib qhov tsim nyog yuav tsum muaj kev qhia luv luv ntawm PON. Nyob rau hauv sib piv rau AON, ntau tus neeg tau txais kev pab cuam rau ib qho kev sib tshuam nkaus xwb los ntawm txoj kev muaj ib ceg ntoo ntawm cov fibers thiab passive splitter / txuas units, kev khiav hauj lwm hauv qhov chaw kho qhov muag thiab tsis muaj hwj chim hauv PON. Muaj ob qho loj li cov qauv PON: Gigabit Passive Optical Network (GPON) thiab Ethernet Passive Optical Network (EPON). Tab sis tsis muaj teeb meem twg ntawm PONs, lawv muaj ib qho tib theem saum theem kev teeb tsa. Ib qhov Gigabit Ethernet Passive Optical Network (GEPON) yog feem ntau ntawm cov dav hlau kho qhov muag (OLT) ntawm qhov chaw muab kev pabcuam hauv chaw ua haujlwm thiab ntau lub xovtooj ntawm qhov chaw sib txuas (ONUs) lossis cov chaw qiv hluav taws xob (ONTs) nyob ze cov neeg siv kawg, thiab raws li qhov kho qhov muag splitter. Tsis tas li ntawd, lub tshuab ua kom pom qhov muag (ODN) siv thaum lub sijhawm kis ntawm OLT thiab ONU / ONT.
Optical Line Terminal (OLT)
OLT ib qho cuab yeej siv ua ke rau kev ua haujlwm L2 / L3 hauv GEPON system. Feem ntau, cov khoom lag luam muaj khib nyiab, CSM (Tswj thiab hloov Module), ELM (EPON Link Module, PON card), redundancy tiv thaiv -48V DC fais fab mov modules los yog 110 / 220V AC fais fab mov module, thiab kiv cua. Nyob rau hauv no, PON daim card thiab lub hwj huam mov yug kub swap thaum lwm module yog ua hauv. Lub ntsiab ntawm OLT yog tswj cov ntaub ntawv ntab thoob ODN, mus ob qho tib si qhia, thaum nyob hauv chaw ua haujlwm hauv paus loj. Qhov siab tshaj plaws txaus siab rau kev xa mus hla lub ODN yog 20 km. OLT muaj ob ntab ntawv qhia: ntws los ntawm kev sib tw (sib kis ntawm cov neeg siv cov ntaub ntawv thiab lub suab khiav tawm ntawm cov neeg siv) thiab nqes taw (tau txais cov ntaub ntawv, lub suab thiab video khiav tawm ntawm lub network metro lossis los ntawm ib lub network ntev thiab xa mus rau tag nrho ONT modules nyob rau hauv ODN.
Optical Network Tsev (ONU)
ONU converts optical teeb liab kis tau los ntawm fiber ntau rau hluav taws xob teeb liab. Cov hluav taws xob hluav taws xob no mam li muab xa mus rau cov neeg tau txais kev pab. Feem ntau, yog ib qho kev ncua deb lossis lwm qhov kev nkag mus ntawm ONU thiab qhov kawg ntawm thaj chaw. Txuas ntxiv, ONU tuaj yeem xa, sib sau ua ke thiab nraug ntau hom ntaub ntawv los ntawm cov qhua tuaj noj thiab xa nws ntws los rau OLT. Kev tu plaub yog qhov txheej txheem uas optimizes thiab reorganises cov kwj ntawv cov ntaub ntawv ces nws yuav tau xa ntau zoo. OLT txhawb cov kev faib nyiaj bandwidth uas tso cai rau ua tus xa cov ntaub ntawv ntab rau OLT, feem ntau tuaj txog ntawm qhov qhua tuaj ntawm tus qhua tuaj noj mov. ONU yuav raug txuas los ntawm ntau txoj kev thiab kab hom, zoo li cov hlua khi tooj hlau, coaxial cable, optical fiber los yog Wi-nkaus.
Optical Network Terminal (ONT)
Ua tau, ONT yog tib yam li ONU hauv essence. ONT yog ib lub sijhawm ITU-T, uas yog ONU yog ib lub sijhawm IEEE. Nkawd ob leeg xam cov khoom siv rau hauv GEPON system. Tiam sis hauv kev xyaum, muaj me ntsis sib txawv ntawm ONT thiab ONU raws li lawv qhov chaw. ONT yog feem ntau ntawm cov neeg siv khoom.
Cov Chaw Muag Khoom Optical Distribution Network (ODN)
ODN, qhov tseem ceeb ntawm PON system, muab qhov nruab nrab ntawm kev sib kis kabmob rau kev sib txuas ntawm ONUs rau cov OLTs. Nws txoj kev ncav yog 20 km lossis deb tshaj. Nyob hauv ODN, cov kabmob fiber ntau, fiber optic connectors, cov khoom siv kho qhov muag, thiab cov khoom pabcuam koom tes nrog sib. Lub ODN tau muaj tsib ntu uas yog cov khoom noj muaj fiber ntau, qhov muag qhov muag, fiber ntau, qhov taw nkag qhov muag, thiab xa cov fiber ntau. Cov fais fab tuag pib ntawm qhov chaw luam tawm qauv ntawm ODF nyob rau hauv chav ua hauj lwm hauv chav ua hauj lwm (CO) chav sib txuas thiab xaus ntawm qhov chaw faib khoom kho qhov muag kom ntev-ntev. Cov khoom faib tawm ntawm cov khoom siv fais fab kis mus rau qhov chaw kho qhov muag tau pom qhov muab faib rau qhov chaw nyob sab hauv. Cov tis fiber ntau txuas cov kev taw qhia qhov muag tau pom kev rau cov qij nyug (ONTs), ua tiav qhov muag pom ntawm fiber ntau hauv cov tsev neeg. Ntxiv mus, ODN yog txoj hauv kev tseem ceeb heev rau PON cov ntaub ntawv kis tau thiab nws txoj kev ncaj qha cuam tshuam rau qhov kev ua tau zoo, kev cia siab, thiab scalability ntawm PON system.
Xaus
Muaj ntau ntau yam OLT, ONU, ONT khoom siv rau GEPON, uas yog cov cim tshiab PON equipments thiab cov khoom siv sib txuas lus ntawm FTTH qhov project. Tag nrho cov khoom siv no muaj nyob rau hauv fiberstore thiab muaj cov xeeb ceem ntawm kev sib txuam siab, yoog tau yooj yim, kev cia siab thiab muaj peev xwm ntawm kev QOS, web-management thiab kev ywj siab tshaj plaws. Yog xav paub ntxiv, thov hu rau peb ntawm focc@fiberfocc.com .
