Qhov sib txawv ntawm XGPON thiab GPON hauv fiber ntau optic tes hauj lwm
GPON
Ob peb xyoos dhau los, PON cov qauv tau hloov pauv. Ua ntej, thaum xyoo 1990s, International Telecommunication Union tau thov APON rau kev sib txuas lus pob khoom siv Asynchronous Transfer Mode (ATM).
Tom qab ntawd, thaum ATM tsis siv lawm, lawv tau npaj lub tswv yim ntawm Broadband Passive Optical Network (BPON).
Niaj hnub no, txawm hais tias BPON tseem muaj txiaj ntsig zoo hauv ob peb lub tshuab, feem ntau cov khoom siv kho qhov muag tau pib siv Gigabit PON (GPON), thiab cov txheej txheem sib kis yog G.984, uas tuaj yeem ua tiav 2.488Gbits / s rub tawm tus nqi thiab 1.244Gbits / s upload. tus nqi.
GPON siv Wavelength Division Multiplexing (WDM) thev naus laus zis los ua kom uploading thiab rub tawm tib lub sijhawm. Feem ntau, 1490nm optical carrier yog siv rau rub tawm, thiab 1310nm optical carrier raug xaiv rau uploading tib lub sijhawm. Yog tias TV teeb liab yuav tsum tau xa mus, nws tseem yuav yog A 1550nm optical carrier siv.
Txawm hais tias txhua ONU tuaj yeem tau txais kev rub tawm ceev ntawm 2.488Gbits / s, GPON kuj tseem siv Lub Sijhawm Kev Sib Tw Ntau Nkag (TDMA) txhawm rau faib sijhawm qee lub sijhawm hauv lub sijhawm teeb tsa rau txhua tus neeg siv. Yog li ntawd, tus nqi rub tawm tau cuam tshuam rau txhua tus neeg siv lub davhlau ya nyob twg tsuas yog ib feem ntawm tag nrho tus nqi, xws li 100Mbits / s, nyob ntawm seb tus neeg siv kev sib txuas lus kho qhov muag faib li cas.
Nrog rau qhov kev thov ntau ntxiv rau video thiab OTT TV cov kev pabcuam, nws yog qhov tsim nyog yuav tsum tau nce tus nqi kom ua tiav cov ntaub ntawv loj ntawm cov yeeb yaj kiab siab, yog li cov tiam tshiab ntawm GPON tau los ua, hu ua XGPON lossis 10G-PON, Raws li ITU raws tu qauv yog G.987.
Qhov siab tshaj plaws rub tawm ntawm XGPON yog siab li 10Gbits / s, thiab tus nqi upload kuj yog 2.5Gbits / s. Nws kuj tau txais WDM thev naus laus zis, thiab lub wavelengths ntawm uplink thiab rub tawm cov khoom siv kho qhov muag yog 1270nm thiab 1577nm feem.
Vim tias qhov sib kis tau nce ntxiv, raws li tib cov ntaub ntawv hom, nws tuaj yeem txuas mus rau ntau ONUs, thiab qhov kev pab cuam siab tshaj plaws tuaj yeem ncav cuag 20km. Txawm hais tias XGPON tsis tau siv dav, nws muab txoj hauv kev txhim kho zoo rau cov neeg ua haujlwm kho qhov muag.
