A matsayin ingantacciyar hanyar sadarwa wacce galibi ana amfani da ita. Ana amfani da EPON ta hanyar masu amfani don haɗawa zuwa hanyar sadarwar shiga. A cikin wannan takarda, an bayyana mahimmin fasahar EPON a takaice, kuma an gabatar da aikace-aikacen EPON a cikin sadarwar gani dalla-dalla, kuma ana nazarin ka'idojin fasaha.
1.TheigabatarwaFarashin EPON
PON ƙanƙara ce ta hanyar sadarwa ta hanyar gani, wanda fasaha ce ta hanyar gani da aka ƙera don tallafawa aikace-aikacen aya-zuwa-multipoint.PON ya ƙunshi Terminal Layin gani (Optical Line Terminal).OLT), Na'urar sadarwa ta gani (ONU) da Optical Distribution Network (ODN) .Muhimmin fasalinsa shine cewa ODN duk yana kunshe da na'urori masu wucewa, kuma siginar yana tarwatsa daga fiber na gani guda ɗaya zuwa kowane mai amfani ta hanyar splitter.Wannan tsarin ana kiransa Passive Optical Network saboda ya bambanta da haɗin gwiwar gargajiya tsakanin ofishin tsakiya da abokin ciniki, kuma tushen na'urorin lantarki suna tsakanin wannan hanyar sadarwa ta hanyar sadarwa. Baya ga fa'idodin adana albarkatun fiber, PON na iya sauƙaƙe aiki da kiyaye tsarin cibiyar sadarwa, wanda shine. mai matukar tasiri wajen rage farashin gini da aiki.Bugu da kari, tsarin tsaftataccen kafofin watsa labarai na gani da kuma hanyar sadarwa na fiber na gani na gani yana tabbatar da tsaron 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 Terminal Layin Layi na gida (OLT), Na'ura mai ba da hanya tsakanin hanyoyin sadarwa na gefen mai amfani (ONU) da kuma Cibiyar Rarrabawar gani (ODN).
2.1OLT
Yawancin lokaci,OLTan sanya shi a cikin dakin injin tsakiya. Yana ba da uzuri na fiber na gani don cibiyar sadarwa mai ƙarfi a cikin hanyar ƙasa, GE, 10baes-t, 100base-t, 10gbase-x da sauran musaya a cikin jagorar sama, daOLTyana goyan bayan ƙirar EI don gane damar muryar TDM.
2.2ONU/ONT
ONU/ONT ana sanya shi a ƙarshen mai amfani, galibi ta amfani da ka'idar Ethernet don fahimtar canja wurin bayanan mai amfani. Ana iya tura bayanai tsakaninOLTkumaONU.
2.3 ODN
A matsayin reshe na fiber m, ODN ya haɗu da kayan aiki marasa amfani naOLTkumaONU. 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 da aka kasaftawa statically a ganiya gudun, dukan tsarin bandwidth za a gaji a cikin wani gajeren lokaci.W kudi na bandwidth ba high, a daya hannun, tsauri bandwidth kasafi zai inganta da bandwidth yin amfani da tsarin.Sai gaggawa bukatun na sabis.ONUza a iya gane ta DBA. Daidaita bandwidth mai ƙarfi tsakaninONUZa a iya inganta ingancin bandwidth upline na PON.Saboda inganta ingantaccen amfani da bandwidth, ƙarin masu amfani da W za a iya ƙarawa akan PON da ke akwai, kuma ƙimar kololuwar bandwidth wanda masu amfani da W zasu iya kaiwa na iya zama kwatankwacin ko ma wuce bandwidth na Hanyar rabon uniform na gargajiya.
Ƙarƙashin sarrafawa hanya ce ta rarraba bandwidth mai ƙarfi.Wannan hanyar ita ce ga dukONUsaƙonnin uplink, ana amfani da suOLTdon bandwidth, toOLTbisa ga bukatar daONUizni daidai da dacewa algorithm don broadband lissafin W.Ainihin ra'ayi na ƙayyadaddun ma'auni algorithm shi ne cewa kowane ONU lee uplink zai iya raba lokacin rarraba tantanin halitta da kuma buƙatar bandwidth. Bisa ga buƙatar kowane.ONU, OLTyana rarraba bandwidth cikin gaskiya kuma cikin hankali, kuma yana ɗaukar nauyin sarrafa nauyi, lambar kuskuren bayanai, asarar tantanin halitta, 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 shi da karfi isa.ONUyana buƙatar daidaitawa da sauran hanyoyin samun damar bazuwar ba tare da takamaiman lokacin samun dama ba.Saboda haka, ana amfani da tsarin ƙididdiga na lokaci rabon samun dama da yawa bayan an kwatanta ƙarancin biyun.Lokacin da aka watsa siginar haɓakawa, ana aika firam ɗin Ethernet a cikin ramin lokaci zuwa wanda. daONUan kasaftawa, kuma ana amfani da girman bayanan da aka bayar ta hanyar kididdigar ƙididdiga don canza girman ramin lokaci.
3.3 OLT's jeri da jinkirta fasahar ramuwa daONUfasahar toshe-da-wasa
Saboda tashar sama ta EPON tana AMFANI da TDMA, samun dama ga maƙasudai da yawa yana sa tsarin bayanan kowane ya jinkirtaONUdaban-daban, don haka an gabatar da kewayon da jinkirin fasahar ramuwa don hana haɗuwar bayanai a cikin yanki na lokaci.Domin guje wa karon bayanan yankin lokaci, yakamata a yi amfani da ma'aunin nesa da fasahar ramuwa na lokaci don daidaita dukkan gibin lokacin hanyar sadarwa. Ta wannan hanyar, fakiti suna zuwa a ƙayyadadden ramin lokaci bisa ga DBA algorithm da goyan bayan toshe da wasa donONU.Auna nisa daga kowaneONUto OLTdaidai da daidaita jinkirin watsawa naONUdaidai zai iya rage tazara tsakanin aika Windows naONU, inganta amfani da tashar uplink da rage jinkiri. An ƙaddamar da ƙaddamar da EPON kuma an kammala shi a lokaci guda cewaOLTwucewa, yin alama daidai lokacin da filogi da wasan naONUan gano.
3.4Aika da karɓar fashe sigina
Tun bayan fashewar siginar kowanneONUana karɓa taOLT, OLTyana buƙatar gane aiki tare na lokaci na ɗan lokaci sannan a karɓi bayanai.ONUkumaOLT.Mafi yawan na'urorin gani ba za su iya cika wannan buƙatun ba, kuma ƙananan ƙananan na'urori masu amfani da na'urori masu kyan gani suna da saurin aiki na kimanin 155M, wanda ya fi dacewa da farashi. karbar karshen. 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
TheONUza a iya saita shi a gefen abokin ciniki (FTTH) ko a kan corridor (FTTB), amma wannan yana cikin yanayin samun damar sel. A cikin 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. Gabaɗaya ana yin wannan hanyar samun dama a cikin corridorcanza.
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.