FTTH Access Network Raws li GPON
Cov xav tau kev pab rau cov ntaub ntawv txuas cov ntaub ntawv tshiab thiab ntau yam kev siv bandwidth tau coj ua rau cov neeg lag luam sib txuas lus kom xav tau cov xov tooj cua fiber ntau. Pab kom ceev nrig ntawm lub computer, fiber ntau rau hauv tsev (FTTH) zoo nkaus li yog qhov kev xaiv zoo tshaj plaws kom ua tau raws li cov xav tau hauv lub sijhawm ntev.
FTTH, yog ib hom kev sib txuas lus ntawm fiber-optic, hais txog kev siv thiab kev siv fiber ntau ntawm lub hauv paus taw tes ncaj qha mus rau ib tus neeg lub tsev. Hauv FTTH lub network, fiber ntau ncav cuag tus ciaj ciam ntawm qhov chaw nyob, zoo li lub thawv sab nrauv ntawm ib lub tsev. FTTH lub network ua rau kev txo qis thiab zoo tshaj bandwidth ntau tshaj ib hom fibers tau. Muaj ob lub tswv yim tseem ceeb rau FTTH network: nquag siv fais fab network (AON) thiab kev kho qhov muag pom zoo (PON). Cov ncej no feem ntau hais txog FTTH access network raws li Gigabit tsis kho qhov muag network (GPON) uas yog ib daim ntawv ntawm PON.
GPON txhais los ntawm ITU-T kev pom zoo series G.984.1 txog G.984.6. Nws ua rau ntau cov khoom siv technology uas nthuav dav thiab txhim kho rau yav dhau los ntawm PON. Zoo li nws cov thawjcoj, GPON yog qhov point-to-multipoint technology uas qhov chaw nres nkoj kho qhov muag (optical kab davhlau ya nyob twg, OLT) txuas lus nrog ntau yam khoom siv (qhov chaw seem hauv qhov dav hlau, ONT) Nyob rau hauv GPON-raws li FTTH access network, nruab nrab ntawm cov khoom siv fais fab tsis tau siv los ua kom muaj fiber ntau ntau los pab ntau qhov chaw, feem ntau ntawm 64-128.
Muaj peb yam tseem ceeb hauv GPON-raws li FTTH access network: lub hauv paus chaw ua haujlwm, hu ua OLT, ib los yog ntau tus neeg siv cov node, hu ua qhov chaw ua haujlwm ntawm ONS lossis ONTs, thiab kho qhov muag. Feem ntau cov OLT raug muab tso rau hauv qhov chaw sib txauv hauv zos thiab nws yog lub cav uas tsav lub FTTH system. Cov haujlwm tseem ceeb ntawm ib lub OLT yog kev teem tsheb thauj neeg, kev tswj tsis tau thiab kev faib nyiaj txiag. ONTs yog muab tso rau hauv tus neeg lub tsev. Lawv txuas nrog OLT los ntawm kev siv fiber ntau qhov muag thiab tsis muaj cov ntsiab lus muaj nyob hauv qhov txuas. Ib qho chaw kho qhov muag, tseem hu ua PON splitter, yog siv los faib cov zog ntawm lub teeb liab. Feem ntau, qhov chaw kho qhov muag zoo tshaj plaws yuav pib ua hauj lwm wavelength ntau yam thiab txhawb kev muaj sia nyob thiab tiv thaiv txoj cai. Cov duab nram qab no qhia tau tias GPON tsim.
GPON raug xaiv rau FTTH access network vim nws cov nta nram qab no thiab qhov ua tau zoo.
Txij li ntawm GPON siv cov kev zoo ntawm qhov kho qhov muag optimum wavelength division multiplexing (WDM), ib lub tshuab fiber ntau yuav siv tau rau cov ntaub ntawv txuas mus rau sab nraud thiab qis dua. Upstream cov ntaub ntawv xa tawm ntawm ib lub caij nyoog ntawm 1310nm nrog ib tug ceev txog 1.25 Gbps. Cov ntaub ntawv nram qab no kis tau rau ib lub caij nyoog ntawm 1490nm nrog tus ceev txog 2.5 Gbps. Yog li, zoo tshaj bandwidth yog xa los ntawm GPON. Dhau li, fiber ntau split cim nyob rau hauv GPON network tej zaum kuj ncav cuag li 1: 128. Uas yog hais rau saum toj-hais zoo bandwidth yuav xa mus rau tej zaum 128 subscribers.
Tseemceeb, tus nqi uas muaj feem rau kev saib xyuas PON system tej zaum yuav qis qis dua, vim tsis muaj sijhawm tsawg uas lub chaw ua haujlwm hauv GPON yuav ua rau poob lossis ua yuam kev thaum lawv ua haujlwm. Dhau li ntawm, GPON tsim yog ib qho kev lag luam hauv txhawm rau ua kom lawv cov kev pab them nqi tsawg kawg nrog kev sib txuas, qhov no txo qhov muaj qhov muag fais fab.
FTTH network raws li GPON tuaj yeem muab kev daws teeb meem rau cov kev xav tau yav tom ntej, xws li kev pabcuam TV thiab video, online games thiab VoIP (Voice Over Internet Protocol). FOCC's GPON ONTs, OLTs thiab optical splitters yog txhua yam ntawm high-quality nrog kev ua tau zoo. Koj tuaj yeem mus saib FOCC kom paub ntau ntxiv txog GPON FTTH cov kev daws teeb meem
