EPON yog PON thev naus laus zis raws li Ethernet. Nws siv PON thev naus laus zis ntawm lub cev txheej txheej, Ethernet raws tu qauv ntawm cov ntaub ntawv txuas txheej, Ethernet nkag tau siv PON topology, thiab kev pabcuam tag nrho nkag mus rau cov ntaub ntawv, suab, thiab video siv optical fiber.
EPON khoom piav qhia:
EPON xa thiab tau txais cov cim ntawm ib qho fiber ntau. Qhov no mechanism yog hu ua ib leeg-fiber bidirectional kis tau tus mob mechanism. Siv WDM wavelength division multiplexing thev naus laus zis, ib leeg-fiber bidirectional kis tau tus mob ua tiav nrog cov wavelengths sib txawv (kem qis 1490nm, nce 1310nm), thiab cov ntaub ntawv ntws thiab cov dej ntws tawm ib txhij kis ntawm ib qho fiber ntau yam tsis muaj kev cuam tshuam rau ib leeg.
Nyob rau tib lub sijhawm, 1000 BASE-PX-10 U yog txhais / D thiab 1000 BASE-PX-20 U / D PON optical interfaces txhawb nqa qhov siab tshaj plaws kis tau tus mob ntawm 10 km thiab 20 km raws li.EPON tuaj yeem muab 1.25 Gbit / s ntws. thiab downstream bandwidth. Nws yog passive optical network raws li Ethernet. CovOLTtxais Ethernet encapsulation thiab xa cov Ethernet thav duab qauv. Yog li, EPON yog raws li 802.3 ncej hom.
Raws li kev pom zoo ntawm IEEE802.3ah-2004: lub zog xa hluav taws xob ntawmOLTsab yog ntau dua 2dBm, thiab qhov tau txais rhiab heev yog <-27dBm; rau covONUKev xa hluav taws xob ntau dua -1dBm, qhov kev nkag siab tau yog <-24dBm, qhov poob ntawm tag nrho cov kev sib txuas kho qhov muag yog mus txog <24dB, nqes mus rau <23.5dB. Qhov poob ntawm EPON upstream 1310nm thiab downstream 1490nm wavelengths hauv G.652 fiber ntau yog li 0.3dB / km. Hauv cov ntsiab lus, cov peev nyiaj siv hluav taws xob yog qhov tseem ceeb tshaj plaws rau EPON nyob deb.
EPON khoom nta
①1.25Gbps symmetric ib fiber bidirectional cov ntaub ntawv txuas
②3.3V ua haujlwm voltage
③DDM digital kuaj xyuas kev ua haujlwm
④ Anti-electromagnetic cuam tshuam, nrog kev tiv thaiv zoo li qub
⑤ Ua raws li IEC-60825 Class 1 laser kev nyab xeeb tus qauv
⑥ Kev ua haujlwm kub: 0 ℃ ~ 70 ℃
EPON technology thov
① Rau cov neeg siv pej xeem, daim ntawv thov hom xws li FTTH thiab FTTB / C / Cab tuaj yeem siv.
②Rau cov neeg siv kev lag luam, cov qauv siv sib txawv xws li FTTO, FTTB, lossis FTTC tuaj yeem txais yuav raws li cov kev xav tau ntawm kev lag luam sib txawv thiab cov neeg siv teev.
③ "Lub Ntiaj Teb Qhov Muag" thiab lwm yam kev siv uas yuav tsum tau muaj bandwidth siab heev (tshwj xeeb tshaj yog nyob rau hauv lub bandwidth) tuaj yeem siv EPON raws li txoj kev nkag. PON hloov cov txheej txheem qub 2 / txheej 3hloovnyob rau hauv cov kev daws teeb meem analog network, thaum tseem txuag tau ntau fiber ntau transceivers, thiab tsis tas yuav siv cov khoom siv kho qhov muag optical transceiver.
④ Nyob rau hauv cov ntaub ntawv ntawm kev tsis txaus ntawm cov khoom siv fiber ntau, xws li cov phiaj xwm hauv zos hauv zos, cov phiaj xwm kho qhov muag nrog ntau theem sib cais thiab tsis sib npaug ntawm lub zog sib cais tuaj yeem siv tau, uas yog, lub zog tsis sib npaug thaum tsuas muaj ib lossis ob peb cores. optical splitters converge point los ntawm point.
EPON ua tau raws li qhov xav tau ntawm bandwidth ntawm kev nkag mus rau cov neeg siv khoom siv network, thiab tuaj yeem hloov pauv thiab hloov pauv hloov pauv raws li cov neeg siv xav tau, ua rau lub neej ntawm cov neeg nyob hauv zej zog tau yooj yim dua, nyab xeeb thiab yooj yim.