PON tam sim no tau dhau los ua cov npe nrov network thoob plaws lub ntiaj teb. Nws thawj zaug tau los nyob hauv xyoo 1995. Lub Koom Haum Sib Tham Hauv Tebchaws Thoob Ntiaj Teb (ITU) tau teeb tsa ob qho pib thawj PON - APON thiab BPON Thiab kev vam meej ntawm PON network yeej tsis tau tso tseg. Txog tam sim no, PON tus qauv tsis ntev los no ntawm NG-PON2 tau muab tso rau xyoo 2015 Nrog kev loj hlob ntawm PON, cov tib neeg tau yooj yim mus cuag cov tes hauj lwm niaj hnub no. Tiam sis PON txhais tau li cas? PON qhov sib xyaw ua ke yog dab tsi? Ntu nram qab no yuav muab cov lus teb rau koj.
PON, tseem hu ua passive optical network, yog thev naus laus zis hauv kev sib txuas xov tooj uas siv qhov taw tes-rau-tshaj tawm (P2MP) architecture. Cov khoom siv hluav taws xob tsis muaj fiber ntau yog siv los ua kom cov khoom siv hluav taws xob zoo ib leeg siv ntau qhov kawg ntawm cov neeg siv xws li cov neeg siv khoom tsis muaj cov khoom nruab nrab ntawm qhov chaw ua haujlwm nruab nrab (chaw ua haujlwm) thiab cov neeg siv khoom. Raws li kev txiav txim siab sib txawv ntawm PON, lub network system tuaj yeem muab faib ua fiber ntau-rau-tsev (FTTH), fiber ntau-rau-the-curb (FTTC), fiber-rau-the-curb (FTTB), thiab lwm yam. qhia tshwj xeeb, ib tus PON ua los ntawm kev kho qhov muag kab davhlau ya nyob twg (OLT) ntawm qhov chaw muab kev pabcuam thiab lub chaw tsim hluav taws xob (ONUs) lossis optical network terminals (ONTs) ze cov neeg siv khoom kawg. Thiab "passive" tsuas yog siv los piav qhia tias tsis muaj lub zog xav tau lossis cov khoom siv hluav taws xob tsis zoo suav nrog kev xa cov cim hauv lub system.
Hom PON Network
Nov yog qee cov PON uas tau siv thoob plaws xyoo:
Nws lub npe tag nrho yog asynchronous hloov hom (ATM) passive optical network. Raws li thawj PON system, APON siv cov thev naus laus zis thev naus laus zis los xa cov ntaub ntawv hauv pob ntawv lossis cov hlwb ntawm qhov loj me. Hauv APON, kev nqes dej ib kis yog qhov txuas txuas ntawm ATM ntws ntawm tus nqi ntawm 155 Mbps lossis 622 Mbps. Kev sib cuag tau hluav taws xob yog hauv hom kev tawg ntawm ATM hlwb ntawm 155 Mbps.
BPON, tseem hu ua broadband PON, yog qhov kev txhim kho ntawm APON. Nws siv cov txheej txheem sib faib yoj sib faib (WDM) rau cov nqes dej nrog qhov sib kis nce mus txog 622 Mbps. Nws tseem muab ntau txoj kev pabcuam broadband xws li ATM, Ethernet nkag tau thiab video faib tawm. Niaj hnub no, BPON tseem nrov dua APON.
EPON lossis Ethernet PON siv Ethernet pob ntawv hloov chaw ntawm ATM ATM. Cov dej tau thiab nqes dej ntawm EPON muaj peev xwm kom cuag tau txog 10 Gbps. Tam sim no dav siv rau FTTP lossis FTTH architecture kom haum rau cov neeg siv ntau yam. Nrog rau qhov zoo ntawm kev ua haujlwm tau yooj yim, yooj yim, multicast yooj yim thiab muaj peev xwm muab kev pabcuam puv ntoob, ntau thaj chaw Asian txais EPON rau lawv cov koom nrog.
Gigabit PON yog qhov kev txhim kho ntawm BPON. Nws txhawb ntau kis nqi nrog tib raws li kev cai. Cov ntaub ntawv siab tshaj plaws ntawm kev nqes dej yog 2.5 Gbps thiab ntws dej yog 1.25 Gbps. Nws kuj tseem siv dav rau FTTH tes hauj lwm. Tab sis piv nrog EPON, nws qhov ntau thiab tsawg tawg thiab lub cev txheej nyiaj siv ua haujlwm me dua.
Cov Zoo Dua Ntawm PON
Tus nqi qis, kev saib xyuas yooj yim, kev hloov pauv yooj yim thiab yooj yim txhim kho. Thiab tsis tas yuav muaj lub zog thaum lub sijhawm sib tsoo txuag tau ntau rau kev tswj xyuas lub sijhawm ntev.
Siv cov ntaub ntawv ntshiab network zam dhau qhov kev cuam tshuam ntawm xob laim thiab xaim hluav taws xob. Yog li PON network yog qhov tsim nyog rau cov cheeb tsam hauv qab mob hnyav.
Kev ua haujlwm tsawg ntawm cov chaw ua haujlwm hauv nruab nrab, qis qis kev nqis peev thiab siab tus nqi rov qab.
Raws li P2MP network, PON muaj peev xwm muab ntau yam kev pabcuam rau cov neeg siv ntau yam.
Xaus
PON network yog kom paub tseeb cov tshuaj zoo rau ntau tus neeg siv network. EPON thiab GPON yog cov feem ntau siv PON lub cev tam sim no. Txij li cov tib neeg tau nrhiav kom tau txais cov kab ntau ntxiv, cov peev xwm ntawm kev sib kis yuav zoo dua nyob rau yav tom ntej.