Monga njira yolankhulirana yogwira mtima yomwe imagwiritsidwa ntchito nthawi zambiri.EPON imagwiritsidwa ntchito ndi ogwiritsa ntchito kuti agwirizane ndi intaneti yofikira.Mu pepala ili, teknoloji yaikulu ya EPON ikufotokozedwa mwachidule, ndipo kugwiritsa ntchito EPON mukulankhulana kwa kuwala kumayambitsidwa mwatsatanetsatane, ndipo mfundo yake yaukadaulo ikuwunikidwa.
1.Theimawu oyambapa EPON
PON ndi contraction ya Passive Optical Network, yomwe ndiukadaulo wofikira wowoneka bwino womwe umapangidwa kuti uthandizire ntchito za point-to-multipoint.PON ili ndi Optical Line Terminal (OLT), Optical Network Unit (ONU) ndi Optical Distribution Network (ODN) . Chofunika kwambiri ndi chakuti ODN yonse imapangidwa ndi zipangizo zopanda pake, ndipo chizindikirocho chimabalalitsidwa kuchokera ku Chingwe chimodzi Chogawidwa kwa wogwiritsa ntchito aliyense kupyolera mu splitter.Dongosololi limatchedwa Passive Optical Network chifukwa ndilosiyana ndi kugwirizana kwachikhalidwe pakati pa pakati ofesi ndi kasitomala, ndi gwero zipangizo zamagetsi ndi pakati pa mwayi network.Kuphatikiza pa ubwino kupulumutsa CHIKWANGWANI chuma, PON akhoza kwambiri wosalira ntchito ndi kukonza maukonde dongosolo, amene amathandiza kwambiri kuchepetsa yomanga ndi ntchito cost.Moreover , kapangidwe ka media koyera komanso mawonekedwe owoneka bwino a fiber burodibandi network zimatsimikizira chitetezo chaukadaulo pakukulitsa bizinesi yamtsogolo.
Tekinoloje ya EPON imaphatikiza ukadaulo wa Ethernet ndi ukadaulo wa PON kuti uzindikire kupezeka kwa fiber fiber point-to-multipoint high-speed Ethernet fiber mu njira yosavuta. ndi TDMA mode ntchito upline, amene angathe kuzindikira njira ziwiri kufala deta.
2.Kupanga kwa EPON
Monga ukadaulo wofikira pamitundu yambiri, Passive Optical Network (PON) imakhala ndi Optical Line Terminal (OLT), mbali ya Optical Network Unit (ONU) ndi Optical Distribution Network (ODN).
2.1 OLT
Nthawi zambiri, OLT imayikidwa m'chipinda chapakati cha makina.Amapereka chowiringula cha fiber optical cha passive optical network kumunsi, GE, 10baes-t, 100base-t, 10gbase-x ndi malo ena opita kumtunda, ndipo OLT imathandizira mawonekedwe a EI kuti azindikire kupezeka kwa mawu a TDM.
2.2 ONU/ONT
ONU/ONT imayikidwa kumapeto kwa ogwiritsa ntchito, makamaka pogwiritsa ntchito Ethernet protocol kuzindikira kusamutsa kowonekera kwa data ya ogwiritsa.Zambiri zitha kutumizidwa pakati pa OLT ndi ONU.
2.3 ODN
Monga nthambi ya fiber yopanda kanthu, ODN imagwirizanitsa zida zogwiritsira ntchito za OLT ndi ONU.Ntchito yaikulu ya ODN ndi kugawa deta ya downlink ndikuyika data ya uplink pakati.Chifukwa ndi ntchito yokhazikika, kugawa kwapang'onopang'ono kumasintha kwambiri komanso koyenera kumadera ambiri.Mwachidziwitso, POS iliyonse ili ndi chiwerengero cha 8, 16, 32 kapena 64, ndipo akhoza kulumikizidwa pamagulu angapo.
3.Imawu oyambaof key tlusoof EPON
3.1Dbasifor dzamphamvubndi m'lifupiamalo
Nthawi yeniyeni (ms/us magnitude) imasintha njira yokwezera bandwidth ya OUN iliyonse pa EPON, yomwe imadziwika kuti dynamic bandwidth allocation algorithm.Mu EPON, ngati bandwidth imagawidwa motsatira ndondomeko, ndiye kuti ntchito yotumizira mauthenga okhudzana ndi deta ndi yosayenera kwambiri. bandwidth imaperekedwa statically pa liwiro lalikulu, dongosolo lonse la bandwidth lidzatheratu mu nthawi yochepa.W mlingo wa bandwidth siwokwera, komano, kugawa kwamphamvu kwa bandwidth kudzapititsa patsogolo kugwiritsa ntchito bandwidth ya dongosolo.Zofunikira za utumiki wadzidzidzi za ONU zitha kuzindikirika ndi DBA.Kusintha kwamphamvu kwa bandwidth pakati pa ONU kumatha kupititsa patsogolo mphamvu ya PON upline bandwidth. kupitilira bandwidth ya njira yachikhalidwe yogawa yunifolomu.
Ulamuliro wapakati ndi njira yogawa bandwidth.Njirayi ndi ya mauthenga onse a ONU uplink, omwe amagwiritsidwa ntchito ku OLT kwa bandwidth, ndiye OLT malinga ndi pempho la chilolezo cha ONU malinga ndi ndondomeko yoyenera ya burodibandi yowerengera W. Lingaliro lofunikira la algorithm ya kugawika kwa magawo ndikuti aliyense wa ONU lee uplink akhoza kugawa nthawi yogawa ma cell ndikupempha bandwidth. Malinga ndi pempho la ONU iliyonse, OLT imagawira bandwidth mwachilungamo komanso momveka bwino, ndikusamalira kuchulukitsitsa, nambala yolakwika yazidziwitso, selo. kutaya, etc.
3.2Gwiritsaninso ntchito ukadaulo wa uplink channel
Pakalipano, kukhazikitsa kwakukulu ndi nthawi yogawanitsa multiplexing (TDMA), yomwe ingagwiritsidwe ntchito nthawi imodzi yogawanitsa nthawi yogawanitsa, kugawa nthawi yowerengera maulendo angapo, kupeza mwachisawawa ndi zina zotero.Komabe, M - nthawi - slot nthawi Mwachitsanzo, pamene mipata ina ya nthawi sikugwiritsidwa ntchito, imakhala ndi bandwidth inayake, kotero kuti kusinthasintha kwakukulu kwa utumiki kulibe mphamvu zokwanira. Nthawi zina zopezera nthawi.Chifukwa chake, kugawikana kwa nthawi yowerengera kambirimbiri kumagwiritsidwa ntchito pambuyo poyerekezera kusowa kwa awiriwo.Pamene chizindikiro cha uplink chikufalikira, chimango cha Ethernet chimatumizidwa mu nthawi yomwe ONU imaperekedwa, ndi kukula kwa deta yoperekedwa ndi chiwerengero cha multiplexing imagwiritsidwa ntchito kusintha kukula kwa nthawi.
3.3 Tekinoloje ya chipukuta misozi ya OLT yoyambira ndikuchedwa komanso ukadaulo wa ONU plug-and-play
Chifukwa njira yopita kumtunda ya EPON AMAGWIRITSA NTCHITO TDMA, kupeza malo ambiri kumapangitsa kuchedwa kwa data kwa ONU iliyonse kukhala yosiyana, kotero kuti ukadaulo wolipiridwa ndi kuchedwetsa umayambitsidwa kuti mupewe kugunda kwa data mu nthawi. Domain deta, kuyeza mtunda ndi nthawi kuchedwa chipukuta teknoloji ayenera kugwiritsidwa ntchito kulunzanitsa lonse netiweki nthawi gap.Mwa njira imeneyi, mapaketi kufika pa lodziwika nthawi kagawo malinga ndi DBA aligorivimu ndi thandizo pulagi ndi kusewera kwa ONU.Kuyeza mtunda kuchokera aliyense. ONU kupita ku OLT molondola ndikusintha kuchedwa kwa kufalitsa kwa ONU molondola kungachepetse nthawi pakati pa kutumiza Windows ya ONU, kupititsa patsogolo kugwiritsa ntchito njira ya uplink ndikuchepetsa kuchedwa.Kuyambira kwa EPON kumayambika ndikumalizidwa nthawi yomweyo yomwe OLT idutsa, kuyika chizindikiro nthawi yomweyo yomwe pulagi ndi kusewera kwa ONU kumapezeka.
3.4Kutumiza ndi kulandira zizindikiro zophulika
Popeza chizindikiro chophulika cha ONU iliyonse chimalandiridwa ndi OLT, OLT ikuyenera kuzindikira kugwirizanitsa gawo kwa nthawi ndikulandira deta.Izi zimafuna kugwiritsa ntchito zipangizo zamakono zomwe zimatha kuthandizira zizindikiro zophulika mu ONU ndi OLT.Zipangizo zambiri za Optical sizingathe kukumana. chofunika ichi, ndi chiwerengero chochepa cha zida zamoto zophulika zimakhala ndi liwiro la ntchito pafupifupi 155M, zomwe zimakhala zokwera mtengo.Dongosolo la kufalikira kwa optical burst transmission liyenera kutseka ndikutsegula mwachangu kwambiri ndikukhazikitsa zizindikiro mwachangu.Chifukwa chake, gawo lachikhalidwe la electro-optical conversion module pogwiritsa ntchito mphamvu zodziwikiratu ndi mayankho siliyeneranso kugwiritsidwa ntchito, koma limafunikira ma lasers ndi mayankho mwachangu. kulandira mapeto amalandira chizindikiro mphamvu kuwala kwa wosuta aliyense ndi wosiyana ndipo ngakhale kusintha kwambiri.Choncho, mu dera lophulika lolandira, mlingo wolandira (pachiyambi) uyenera kusinthidwa nthawi zonse pamene chizindikiro chatsopano chikulandiridwa.
4.Kugwiritsa ntchito kuyankhulana kwa fiber optic mu selo
ONU ikhoza kukhazikitsidwa kumbali ya kasitomala (FTTH) kapena pa korido (FTTB), koma izi ziri mu nkhani ya ma cell.Mu FTTH mode, chiwerengero cha ogwiritsa ntchito sichidziwika.Pamenepa, pofuna kupititsa patsogolo kagwiritsidwe ntchito ka zipangizo, kuchepetsa ndalama ndikuthandizira kukonza.Kuyika kwa optical divider kumakhala kokhazikika, ndi kugwiritsa ntchito mlingo wa kugawa kuwala, kukhazikitsa malo a zinthu zambiri mu kompyuta. chipinda cha anthu ammudzi kapena anthu ammudzi mkati mwa bokosi lopereka kuwala.Pambuyo pomanga motere, ziribe kanthu kuti chiwerengero cha ogwiritsa ntchito chiwonjezeke kapena kuchepa, kugwiritsa ntchito zipangizo kumatha kukulitsidwa.Komabe, chiwerengero cha ogwiritsa ntchito chikachuluka, kufunikira kokhala ndi fiber optical kudzawonjezekanso kwambiri.Pamene mu FTTB mode, OMU imayikidwa mu khola, ndipo splitter optical imayikidwa mofanana ndi FTTH.Njira yolowera iyi nthawi zambiri imachitika munjira yosinthira.
Mapeto
Tekinoloje ya EPON ili ndi zabwino zambiri, monga kufalikira kwa ogwiritsa ntchito, kuthamanga kwambiri kumtunda ndi kunsi kwa mtsinje, mawonekedwe owoneka bwino, kupulumutsa zinthu za fiber kuchokera kumalo ochezera ambiri ndi zina zambiri. -Kugwira ntchito kwapadera kumapangidwira luso la zomangamanga, komanso kumakhalabe, kulibe mphamvu yopulumutsira mphamvu yamagetsi komanso chitetezo cha chilengedwe.Monga luso lamakono loyankhulana, teknoloji ya EPON ndiyofunikira kwambiri. kusinthasintha kwamphamvu kumalo otumizira, kudalirika kwakukulu komanso kusamalidwa, kukhala chisankho chabwino kwambiri pomanga maukonde amtundu wotsatira wa Broadband.