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 ndi ukadaulo wofikira wowoneka bwino womwe umapangidwa kuti uthandizire ma point-to-multipoint applications.PON ili ndi Optical Line Terminal (OLT), Optical Network Unit (ONU) ndi Optical Distribution Network (ODN) .Chinthu chake chofunikira ndi chakuti ODN yonse imapangidwa ndi zipangizo zopanda kanthu, ndipo chizindikirocho chimabalalitsidwa kuchokera kumodzi Shared optical fiber kwa aliyense wogwiritsa ntchito pogwiritsa ntchito splitter.Dongosololi limatchedwa Passive Optical Network chifukwa ndizosiyana ndi kugwirizana kwachikhalidwe pakati pa ofesi yapakati ndi kasitomala, ndipo gwero la zipangizo zamagetsi zili pakati pa intaneti iyi. Kuphatikiza pa ubwino wopulumutsira fiber, PON ikhoza kuchepetsa kwambiri ntchito ndi kukonza dongosolo la intaneti, lomwe ndi zothandiza kwambiri pochepetsa ndalama zomanga ndi zogwirira ntchito.Kuphatikizansopo, 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 tekinoloje yolumikizira fiber point-to-multipoint, Passive Optical Network (PON) imakhala ndi Optical Line Terminal.OLT), mawonekedwe a Optical Network Unit (ONU) ndi Optical Distribution Network (ODN).
2.1OLT
Nthawi zambiri,OLTimayikidwa m'chipinda chapakati cha makina. Amapereka chowiringula cha fiber optical cha passive optical network kupita pansi, GE, 10baes-t, 100base-t, 10gbase-x ndi ma interfaces ena kumtunda, ndiOLTimathandizira mawonekedwe a EI kuti azindikire kupezeka kwa mawu a TDM.
2.2ONU/ONT
ONU/ONT imayikidwa kumapeto kwa ogwiritsa ntchito, makamaka pogwiritsa ntchito Ethernet protocol kuzindikira kusamutsa kowonekera kwa data ya ogwiritsa. Deta ikhoza kutumizidwa pakatiOLTndiONU.
2.3 ODN
Monga nthambi ya fiber yopanda kanthu, ODN imalumikiza zida zongokhalaOLTndiONU. 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 kugwiritsidwa ntchito kwa bandwidth kwa dongosolo.ONUzitha kuzindikirika ndi DBA. Kusintha kwamphamvu kwa bandwidth pakatiONUChifukwa cha kupititsa patsogolo kagwiritsidwe ntchito ka bandwidth, ogwiritsa ntchito ambiri a W akhoza kuwonjezeredwa pa PON yomwe ilipo, ndipo chiwerengero chapamwamba cha bandwidth chomwe ogwiritsa ntchito angafikire akhoza kufananizidwa kapena kupitirira bandwidth ya njira yachikhalidwe yogawa mayunifolomu.
Ulamuliro wapakati ndi njira yogawa bandwidth.Njira iyi ndi ya onseONUuplink mauthenga, amagwiritsidwa ntchito kwaOLTkwa bandwidth, ndiyeOLTmonga mwa pempho la aONUchilolezo mogwirizana ndi aligorivimu yoyenera kwa burodibandi mlandu W. Lingaliro loyambirira la njira zogawira zowerengera ndikuti aliyense ONU lee uplink akhoza kugawa nthawi yogawa ma cell ndikupempha bandwidth. Malinga ndi pempho la aliyenseONU, OLTimagawa bandwidth mwachilungamo komanso momveka bwino, ndikuwongolera kuchulukirachulukira, nambala yolakwika yazidziwitso, kutayika kwa ma cell, ndi zina zambiri.
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 sikuli kokwanira.ONUamafunikira kulunzanitsa ndi zina mwachisawawa njira zopezera popanda nthawi ndithu kupeza.Choncho, ziwerengero nthawi kugawikana multiplexing kupeza zambiri ntchito pambuyo poyerekeza kusowa kwa awiriwo.Pamene chizindikiro uplink imafalitsidwa, chimango Efaneti amatumizidwa mu nthawi imene. ndiONUimaperekedwa, ndipo kukula kwa deta yoperekedwa ndi kuchulukitsa kwa chiwerengero kumagwiritsidwa ntchito kusintha kukula kwa nthawi.
3.3 OLT's kuyambira ndikuchedwetsa chipukuta misozi ndiONUukadaulo wa pulagi-ndi-sewero
Chifukwa tchanelo cham'mwamba cha EPON AMAGWIRITSA NTCHITO TDMA, kupeza malo ambiri kumapangitsa kuti chimango cha data chichedweONUzosiyana, kotero kuti ukadaulo wolipiridwa ndi kuchedwa umayambitsidwa kuti mupewe kugunda kwa data mu domain.In kuti mupewe kugundana kwa data yanthawi yayitali, kuyeza mtunda ndi ukadaulo wolipirira nthawi yochedwa uyenera kugwiritsidwa ntchito kulumikiza kusiyana kwa nthawi yapaintaneti. Mwanjira imeneyi, mapaketi amafika pa nthawi yodziwika molingana ndi algorithm ya DBA ndi pulagi yothandizira ndikusewera.ONU.Kuyeza mtunda kuchokera pa chilichonseONUto OLTmolondola ndi kukonza kuchedwa kufala kwaONUndendende amatha kuchepetsa nthawi pakati pa kutumiza Windows yaONU, kukonza kagwiritsidwe ntchito ka njira ya uplink ndikuchepetsa kuchedwa.Kuyambira kwa EPON kumayambika ndikumalizidwa nthawi yomweyoOLTamadutsa, cholemba nthawi yomweyo kuti pulagi ndi sewero laONUwapezeka.
3.4Kutumiza ndi kulandira zizindikiro zophulika
Popeza kupasuka chizindikiro cha aliyenseONUimalandiridwa ndiOLT, OLTimayenera kuzindikira kulumikizana kwa gawo kwa nthawi yayitali ndikulandila data.ONUndiOLTZipangizo zambiri zowoneka bwino sizingakwaniritse izi, ndipo zida zocheperako zophulika zimakhala ndi liwiro logwira ntchito pafupifupi 155M, lomwe ndi lamtengo wapatali kwambiri. kulandira mapeto. 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
TheONUikhoza kukhazikitsidwa kumbali ya kasitomala (FTTH) kapena pakhonde (FTTB), koma izi ndizochitika za 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 m'kholakusintha.
Mapeto
Tekinoloje ya EPON ili ndi maubwino ambiri, 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.