EPON (Ethernet Passive Fiber Optical Network)
EPON yog kev sib txuas ntawm ntau cov txuj ci zoo tshaj plaws thiab cov cuab yeej network. EPON siv qhov ua kom pom kev-tsim-ntau lub chaw thiab muaj qhov xa hluav taws xob fiber ntau xa mus rau ntau cov kev pabcuam dua Ethernet. Tam sim no, IP / Ethernet cov ntawv thov suav tau ntau dua 95% ntawm tag nrho LAN kev sib txuas lus. EPON yuav dhau los ua cov qauv kev sib txuas lus zoo tshaj plaws rau kev sib txuas ntawm cov neeg siv kawg ntawm kev nkag mus rau lub network los ntawm kev siv tus qauv kev lag luam thiab txiaj ntsig saum toj no. EPON tsis tas yuav muaj cov txheej txheem nyuaj, cov cim kho qhov muag tuaj yeem raug xa mus rau cov neeg siv kawg, thiab cov ntaub ntawv los ntawm cov neeg siv kawg tuaj yeem xa mus rau central network. Ntawm lub cev txheej txheem, EPON siv 1000BASE Ethernet PHY, thiab tib lub sijhawm, hauv PON kis mechanism, tshiab MAC tswj kev tswj hwm tau siv los tswj thiab ua kom zoo tshaj qhov tawg ntawm cov ntaub ntawv kev sib txuas lus thiab kev sib txuas lus ntawm TDM ntawm txhua ONU thiab cov OLT. Ntawm theem ob ntawm kev cai, EPON siv cov thev naus laus zis puv-tshuab Ethernet thev naus laus zis. Nrog TDM, vim tias ONU xa cov datagrams hauv nws tus kheej lub sijhawm me me, tsis muaj kev sib tsoo thiab tsis muaj CDMA / CD yog qhov yuav tsum tau ua, kom qhov bandwidth siv tau zoo. Ntxiv rau, EP0N muab QoS zoo ib yam li APON los ntawm kev siv 802.1p hauv MAC txheej.
Ib txwm muaj Ethernet hla PON system muaj OLT, ONU, thiab POS. OLT (Optical Line Terminal) muab tso rau hauv chav siv khoom siv hauv tsev nruab nrab, thiab ONU (Optical Network Unit) muab tso ze lossis ua ke nrog chav sib txuas network. POS (Passive Optical Splitter) yog lub tshuab hluav taws xob passive optical fiber splitter. Nws yog cov khoom ntsuas dhau uas txuas OLT thiab ONU. Nws txoj haujlwm yog faib cov ntaub ntawv downlink thiab mloog zoo cov ntaub ntawv uplink. OLT yog ob qho tib si hloov lossis router thiab ntau qhov kev pabcuam pabcuam pabcuam uas muaj cov vev xaib fiber ntau mus rau lub network fiber ntau. Raws li tus qauv ntawm Ethernet mus rau cheeb tsam hauv nroog thiab thaj chaw loj hlob, ntau qhov Gbit / s thiab 10Gbit / s Ethernet cuam tshuam yuav muab ntawm OLT los txhawb WDM kev xa khoom. OLT kuj tseem txhawb ATM, FR, thiab SONET kev sib txuas ntawm tus nqi xws li OC3 / 12/48/192. Yog tias koj xav tau txhawb lub suab TDM tsoos, kab xov tooj zoo ib yam (POTS) thiab lwm yam kev sib txuas lus ntawm TDM (T1 / E1) tuaj yeem sib txuas thiab txuas nrog rau cov txuas nrog. Ntxiv nrog rau muab kev koom tes hauv lub network thiab nkag mus ua haujlwm, OLT kuj tseem tuaj yeem siv rau cov neeg siv. Txawv QoS / SLA qhov yuav tsum tau muaj rau kev faib cov bandwidth, network kev ruaj ntseg, thiab kev tswj hwm kev teeb tsa. OLT tuaj yeem teeb nrog ntau OLTs (Optical Line Card). Lub OLC txuas nrog ntau lub ONUs los ntawm POS. POS yog qhov khoom siv yooj yim. Nws tsis tas yuav muaj lub zog fais fab thiab tuaj yeem tso rau hauv qhov chaw txhua huab cua. Feem ntau, POS tus nqi sib faib yog 8, 16 lossis 32, thiab tuaj yeem txuas rau ntau qib. Hauv EPON, qhov kev ncua deb ntawm OLT thiab ONU tuaj yeem mus txog 20km. Yog tias siv lub tshuab ua fiber ntau (ua kom rov ua dua), qhov kev ncua deb tuaj yeem txuas ntxiv.
ONU hauv EPON txais qhov kev paub tab thiab kev ua haujlwm Ethernet raws tu qauv, thiab paub tseeb tus nqi qis Ethernet Txheej 2 Txheej 3 hloov ua haujlwm hauv nruab nrab bandwidth thiab bandwidth siab ONU. Hom ONU tuaj yeem ua cascaded muab kev qhia zoo bandwidth rau ntau tus neeg siv kawg. Vim tias Ethernet raws tu qauv siv, nyob rau hauv cov txheej txheem ntawm kev sib txuas lus, kev hloov pauv kev cai yog tsis xav tau, thiab ONU pob tshab kis cov neeg siv cov ntaub ntawv. ONU tseem txhawb nqa lwm cov kev cai TDM ib txwm tsis muaj kev ua kom nruj ntawm kev tsim thiab ua haujlwm. Nyob rau hauv qhov siab bandwidth ONUs, coob ntawm Ethernet interfaces thiab ntau yam T1 / E1 interfaces yuav muab. Tau kawg, rau kev siv fiber ntau-rau-tsev (FTTH), ONU thiab NIU tuaj yeem ua ke rau hauv cov khoom siv yooj yim uas tsis tas yuav hloov lub zog, pub rau cov neeg siv kawg tau faib cov qhov bandwidth ntawm tus nqi qis heev.
OPTICO KEV SIB TXUAS LUS (www.fiberopticom.com) tsom mus rau kev txhim kho offiber optic network sib txuas lus cov khoom kab thiab muab kev daws teeb meem zoo rau cov khoom siv sib txuas fiber ntau. Peb muab cov fiber ntau ua ke, xws li cov hlua fiber ntau, fiber ntau pigtail, PLC splitter, txuas txuas ceev, MTP / MPO, CWDM / DWDM, SFP, FTTH tov, Cov ntaub ntawv nruab nrog cov xov hluav taws xob, thiab lwm yam. kev tsim khoom thiab tshuaj xyuas, kom ntseeg tau tias muaj kev ua haujlwm zoo thiab ruaj khov khoom zoo, thiab kev nyab xeeb thiab kev ntseeg tau zoo kom ntseeg tau siv lub sijhawm ntev ntawm cov khoom.
Kom paub meej ntxiv, pls mus xyuas OPTICO lub vev xaib:www.fiberopticom.com.