A matsayin ingantacciyar hanyar sadarwa wacce galibi ana amfani da ita.Masu amfani da EPON suna amfani da EPON don haɗi zuwa hanyar sadarwar shiga. A cikin wannan takarda, an bayyana mahimmin fasaha na EPON a takaice, kuma an gabatar da aikace-aikacen EPON a cikin sadarwa na gani daki-daki, kuma ana nazarin ka'idojin fasaha.
1.TheigabatarwaFarashin EPON
PON wani ƙanƙancewa ne na Cibiyar Sadarwar Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙadda ) ne da aka ƙera don tallafawa aikace-aikace na batu-zuwa-multipoint.PON ya ƙunshi Optical Line Terminal (OLT), Optical Network Unit (ONU) da Optical Distribution Network (ODN) .Its Siffa mai mahimmanci ita ce ODN duk tana kunshe da na'urori masu wucewa, kuma siginar yana tarwatsewa daga siginar Fitar gani guda ɗaya zuwa kowane mai amfani ta hanyar splitter.Wannan tsarin ana kiransa Passive Optical Network saboda ya bambanta da haɗin al'ada tsakanin tsakiyar tsakiya. ofis da abokin ciniki, da kuma tushen na'urorin lantarki suna tsakanin wannan hanyar sadarwa ta hanyar sadarwa. Baya ga fa'idodin adana albarkatun fiber, PON na iya sauƙaƙa aiki da kiyaye tsarin cibiyar sadarwa sosai, wanda ke da tasiri sosai wajen rage farashin gini da aiki. , Tsarin kafofin watsa labarai masu tsafta da ingantaccen hanyar sadarwa ta hanyar sadarwa ta fiber mai fa'ida ta tabbatar da tsaro na fasaha na fadada kasuwancin nan gaba.
Fasahar EPON ta haɗu da fasahar Ethernet tare da fasahar PON don gane ma'ana-zuwa-multipoint high-gudun Ethernet fiber access a cikin hanya mai sauƙi.Tsarin-zuwa-multipoint topology shine tsarin tsarin da EPON ya karɓa, yayin da ake amfani da yanayin watsa shirye-shirye don downlink. kuma ana amfani da yanayin TDMA don haɓakawa, wanda zai iya fahimtar watsa bayanai ta hanyoyi biyu.
2.Haɗin gwiwar EPON
A matsayin fasaha-zuwa-multipoint fiber access technology, Passive Optical Network (PON) ya ƙunshi na gida Optical Line Terminal (OLT), mai amfani-gefen Optical Network Unit (ONU) da Optical Distribution Network (ODN).
2.1 OLT
Yawancin lokaci, ana sanya OLT a cikin ɗakin injin na tsakiya.Yana ba da uzuri na fiber na gani don hanyar sadarwa mai ƙarfi a cikin hanyar ƙasa, GE, 10baes-t, 100base-t, 10gbase-x da sauran musaya a cikin jagorar sama, kuma OLT yana goyan bayan ƙirar EI don gane damar muryar TDM.
2.2 ONU/ONT
Ana sanya ONU/ONT a ƙarshen mai amfani, galibi ta hanyar amfani da ka'idar Ethernet don fahimtar canja wurin bayanan mai amfani.Ana iya tura bayanai tsakanin OLT da ONU.
2.3 ODN
A matsayin reshe na fiber m, ODN yana haɗa kayan aiki na OLT da ONU.Babban aikin ODN shine rarraba bayanan downlink da kuma daidaita bayanan haɓakawa.Saboda aiki ne mai sauƙi, ƙaddamarwa mai rarrabawa yana da sauƙi kuma ya dace da yawancin yanayi. ko 64, kuma ana iya haɗa shi a matakai da yawa.
3.Igabatarwaof key tilmin halittaoda EPON
3.1Dbasfor dmbda fadiawuri
Real-time (ms/us magnitude) yana canza tsarin bandwidth mai haɓakawa na kowane OUN akan EPON, wanda aka sani da tsayayyen bandwidth kasafi algorithm. bandwidth an kasafta shi a tsaye a cikin sauri mafi girma, duk tsarin bandwidth na tsarin zai ƙare a cikin ɗan gajeren lokaci.W adadin bandwidth ba shi da yawa, a gefe guda, ƙaddamar da bandwidth mai ƙarfi zai inganta amfani da bandwidth na tsarin.Buƙatun sabis na ONU na gaggawa za a iya gane ta DBA.Daidaitawar bandwidth mai ƙarfi tsakanin ONU na iya haɓaka haɓakar haɓakar bandwidth na sama na PON.Saboda ingantaccen ingantaccen amfani da bandwidth, ana iya ƙara ƙarin masu amfani da W akan PON da ke akwai, kuma ƙimar ƙimar bandwidth ɗin da masu amfani da W za su iya kaiwa na iya zama kwatankwacin ko ma. wuce bandwidth na gargajiya uniform kasafi hanya.
Ƙarƙashin sarrafawa hanya ce ta rarraba bandwidth mai ƙarfi.Wannan hanyar ita ce ga duk saƙonnin haɓakawa na ONU, ana amfani da su zuwa OLT don bandwidth, sannan OLT bisa ga buƙatun izinin ONU daidai da daidaitaccen algorithm don faɗaɗa faɗaɗa don lissafin W.The ainihin ra'ayi na ka'idojin rarraba algorithm shine cewa kowane ONU lee uplink zai iya raba lokacin rarrabawar cell zuwa da buƙatar bandwidth. Bisa ga buƙatar kowane ONU, OLT yana rarraba bandwidth daidai da hankali, kuma yana sarrafa nauyin aiki, lambar kuskuren bayanai, tantanin halitta. asara, da sauransu.
3.2Sake amfani da fasaha na tashar uplink
A halin yanzu, babban aiwatarwa shine lokacin rarraba abubuwa da yawa (TDMA), wanda za'a iya amfani dashi a lokaci guda damar samun damar yin amfani da mahara guda ɗaya, lokaci ɗaya. – division multiplexing yana da wasu shortcomings.Misali, lokacin da wasu daga cikin lokaci ramummuka ba a yi amfani da, shi ya mamaye wani bandwidth, sabõda haka, high fashe kudi adaptability ba da karfi isa.The ONU yana bukatar aiki tare da sauran bazuwar hanyoyin samun damar ba tare da. Wasu lokuta samun damar.Saboda haka, ƙididdigar lokaci rarraba mahara damar yin amfani da yawa ana amfani da su gabaɗaya bayan kwatanta ƙarancin biyun.Lokacin da aka aika siginar haɓakawa, ana aika firam ɗin Ethernet a cikin lokacin da aka keɓe ONU, da girman girman. ana amfani da bayanan da aka bayar ta hanyar ƙididdige yawan ƙididdiga don canza girman ramin lokaci.
3.3 OLT ta kewayo da jinkirta fasahar ramuwa da fasahar toshe-da-wasa ta ONU
Domin tashar EPON ta sama tana AMFANI da TDMA, samun dama ga maƙasudi da yawa yana sanya jinkirin tsarin bayanan kowane ONU ya bambanta, don haka ana gabatar da kewayon da jinkirin fasahar ramuwa don hana haɗarin bayanai a cikin yanki na lokaci.Don guje wa karon lokaci. Ya kamata a yi amfani da bayanan yanki, ma'aunin nisa da fasahar ramuwa na lokaci don daidaitawa gabaɗayan gibin lokacin hanyar sadarwa.Ta wannan hanyar, fakiti suna zuwa a ƙayyadadden ramin lokaci bisa ga DBA algorithm kuma suna goyan bayan toshe da wasa don ONU.Aunawa nesa daga kowane. ONU zuwa OLT daidai da daidaitawa jinkirin watsawa na ONU daidai zai iya rage tazara tsakanin aika Windows na ONU, inganta yin amfani da tashar uplink kuma rage jinkiri. An ƙaddamar da jeri na EPON kuma an kammala shi a daidai lokacin da OLT ya wuce, alama daidai lokacin da aka gano toshe da wasan ONU.
3.4Aika da karɓar fashe sigina
Tun da fashewar siginar kowane ONU ya karɓi ta OLT, OLT yana buƙatar gane aiki tare na lokaci na ɗan lokaci sannan kuma karɓar bayanai. wannan buƙatun, da ƙananan na'urori masu gani na yanayin fashe suna da saurin aiki na kusan 155M, wanda yake da ƙarancin farashi.Saboda haka, don gane fashe yanayin yadda ya kamata, ana amfani da fasaha na musamman don ƙarshen karɓar.The Tantancewar fashe watsa kewaye yana buƙatar samun damar rufewa da buɗewa da sauri da kuma kafa sigina da sauri.Saboda haka, al'ada na al'ada na lantarki ta hanyar amfani da ikon sarrafa atomatik tare da amsawa bai dace da amfani ba, amma yana buƙatar lasers tare da amsa mai sauri. Karɓar ƙarshe yana karɓar ikon hasken siginar kowane mai amfani ya bambanta kuma ma ya fi muni.Don haka, a cikin da'irar karɓar fashe, matakin karɓa (ƙofa) yana buƙatar daidaitawa duk lokacin da aka karɓi sabon sigina.
4.Application na fiber optic sadarwa a cikin cell
Ana iya saita ONU a gefen abokin ciniki (FTTH) ko a kan corridor (FTTB), amma wannan yana cikin yanayin samun damar sel. A yanayin FTTH, adadin masu amfani ba shi da tabbas.A wannan yanayin, don inganta ƙimar amfani da kayan aiki, rage farashi da sauƙaƙe kulawa.Tsarin rarrabawar gani yana da mahimmanci, da kuma amfani da matakin rarraba haske, saitin wurin abubuwa da yawa a cikin kwamfutar. dakin al'umma ko al'umma a cikin akwatin mika haske.Bayan ginin ta irin wannan hanyar, komai yawan masu amfani ya karu ko raguwa, ana iya ƙara yawan amfani da kayan aiki.Duk da haka, lokacin da yawan masu amfani ya yi girma, buƙatar samun damar yin amfani da fiber na gani zai kara da yawa. Yayin da yake cikin yanayin FTTB, an saita OMU a cikin corridor, kuma an saita mai rarraba na gani kamar yadda FTTH.Ana aiwatar da wannan yanayin shiga gabaɗaya a cikin maɓalli na corridor.
Kammalawa
Fasahar EPON tana da fa'idodi da yawa, irin su fa'idar ɗaukar hoto na masu amfani, babban saurin sama da ƙasa, ingantaccen halayen watsawa na gani, adana albarkatun fiber daga aya zuwa cibiyar sadarwa da yawa da sauransu.Don bayanan murya, ɗaukar hoto da yawa na bidiyo da mai ɗaukar hoto. -level aiki tsara fasahar gine-gine, amma kuma yana da m, babu electromagnetic radiation makamashi ceto da muhalli halaye.A matsayin Tantancewar sadarwa fasahar, EPON fasahar ne mai girma muhimmanci.A matsayin daya daga cikin na al'ada fasahar a nan gaba, EPON fasahar yana da halaye. na daidaitawa mai ƙarfi ga yanayin ƙaddamarwa, babban abin dogaro da rashin kulawa, zama mafi kyawun zaɓi don gina hanyar sadarwa ta hanyar sadarwa ta zamani mai zuwa.