Nuburyo bwiza bwo gutumanaho bukoreshwa kenshi. EPON ikoreshwa nabakoresha kugirango bahuze umuyoboro winjira.Muri iyi nyandiko, tekinoroji yingenzi ya EPON isobanuwe muri make, kandi ikoreshwa rya EPON mugutumanaho kwa optique ryatangijwe muburyo burambuye, kandi ihame ryubuhanga rirasesengurwa.
1.Uwitekaintroductionya EPON
PON ni igabanywa rya Passive Optical Network, nubuhanga bwa optique bwo gutezimbere bwatezimbere kugirango bushyigikire ingingo-kuri-kugwiza.PON igizwe na Optical Line Terminal (OLT), Umuyoboro wa Optical Network Unit (ONU. iratandukanye no guhuza gakondo hagati yibiro bikuru nu mukiriya, kandi ibikoresho bya elegitoroniki bituruka hagati yuru rubuga. Usibye ibyiza byo kuzigama ibikoresho bya fibre, PON irashobora koroshya cyane imikorere no gufata neza sisitemu y'urusobe, aribyo byiza cyane mukugabanya ibiciro byubwubatsi nibikorwa.Ikindi kandi, imiterere yibitangazamakuru byiza bya optique hamwe numuyoboro mugari wa optique fibre umuyoboro mugari byemeza umutekano wa tekiniki yo kwagura ubucuruzi.
Ikoranabuhanga rya EPON rihuza tekinoroji ya Ethernet hamwe na tekinoroji ya PON kugirango tumenye ingingo-kuri-kugwiza umuvuduko mwinshi wa Ethernet fibre uburyo bworoshye.Uburyo bwa point-to-multipoint topology nuburyo bwuburyo bwemejwe na EPON, mugihe uburyo bwo gutangaza bukoreshwa kumurongo wo hasi na TDMA uburyo bukoreshwa murwego rwo hejuru, rushobora kumenya uburyo bubiri bwo kohereza amakuru.
2.Ibigize EPON
Nka point-to-multipoint fibre tekinoroji, Passive Optical Network (PON) igizwe na Optical Line Terminal (OLT), umukoresha-uruhande rwa Optical Network Unit (ONU) hamwe na Optical Distribution Network (ODN).
2.1OLT
Igihe kinini,OLTishyirwa mucyumba cyimashini hagati. Itanga fibre optique urwitwazo rwa optique ya optique muburyo bwo kumanuka, GE, 10baes-t, 100base-t, 10gbase-x nandi masura mucyerekezo cyo hejuru, naOLTishyigikira interineti ya EI kugirango umenye amajwi ya TDM.
2.2ONU/ ONT
ONU/ ONT ishyizwe kumpera yumukoresha, cyane cyane ikoresha protocole ya Ethernet kugirango tumenye neza kohereza amakuru yumukoresha. Amakuru arashobora koherezwa hagatiOLTnaONU.
2.3 ODN
Nka fibre fibre ishami, ODN ihuza ibikoresho bya passiyo yaOLTnaONU. Igikorwa nyamukuru cya ODN nugukwirakwiza amakuru yamanutse no guhuza amakuru ya uplink.Kubera ko ari imikorere ya passiyo, kohereza pasiporo igabanya ibintu byoroshye kandi bikwiranye nibidukikije byinshi.Mu buryo busanzwe, buri POS ifite igipimo cya 8, 16, 32 cyangwa 64, kandi irashobora guhuzwa murwego rwinshi.
3.Introductionof key tIkoranabuhangaof EPON
3.1Dbasfor dibyiringirobn'ubugariaAhantu
Igihe nyacyo (ms / us ubunini) gihindura uburyo bwogukwirakwiza umurongo wa buri OUN kuri EPON, uzwi nka dinamike ya bande ya algorithm.Muri EPON, niba umurongo wagabanijwe muburyo buhamye, noneho serivise yo kohereza amakuru kubitumanaho ntibikwiye.Niba Umuyoboro mugari watanzwe muburyo bwihuse, umurongo wa sisitemu yose uzaba unaniwe mugihe gito.W igipimo cyumuvuduko mwinshi ntabwo kiri hejuru, kurundi ruhande, kugabura kwagutse bizamura imikoreshereze yumurongo wa sisitemu.Ibisabwa bya serivisi bitunguranyeONUbirashobora kugerwaho na DBA. Umuyoboro mugari uhindagurika hagatiONUIrashobora kunoza imikorere ya PON hejuru yumurongo mugari.Kubera kunoza imikorere yumurongo mugari, abakoresha W benshi barashobora kongerwaho kuri PON ihari, kandi numurongo mugari wa W abakoresha bashobora kugeraho ushobora kugereranwa cyangwa no kurenza umurongo wa uburyo bwo kugabura imyenda gakondo.
Igenzura ryibanze nuburyo bwo kugabura kwaguka.Iyi nzira ni ya yoseONUkuzamura ubutumwa, bikoreshwa kuriOLTUmuyoboro mugari, hanyumaOLTukurikije icyifuzo cyaONUUruhushya rujyanye na algorithm ijyanye numuyoboro mugari wabaruwe kuri W.Igitekerezo cyibanze cyibipimo ngenderwaho byo kugabura algorithm ni uko buri ONU lee uplink ishobora kugabanya igihe cyo kugabura kwakagari no gusaba umurongo. Ukurikije icyifuzo cya buriONU, OLTKugenera umurongo mugari muburyo bwiza kandi bushyize mu gaciro, kandi ukemura ibibazo birenze urugero, amakuru yamakosa yamakuru, gutakaza selile, nibindi.
3.2Ongera ukoreshe tekinoroji ya uplink umuyoboro
Kugeza ubu, ishyirwa mu bikorwa ryingenzi ni igihe cyo kugabana inshuro nyinshi zo kugwiza (TDMA), zishobora gukoreshwa icyarimwe umwanya wo kugabana umwanya wo kugwiza, kugaburira igihe cyo kubara inshuro nyinshi kugwiza ibintu byinshi, uburyo butemewe nibindi.Nyamara, M - igihe - umwanya wigihe - kugabana kugwiza kugabanura bifite ibitagenda neza.Urugero, mugihe bimwe mubihe umwanya udakoreshwa, bifata umurongo mugari, kuburyo serivise yo hejuru yo guturika kwa serivise idakomeye bihagije.ONUikenera guhuza hamwe nubundi buryo butemewe bwo kubona nta gihe runaka cyo kugeraho.Nuko rero, igihe cyibarurishamibare kugabana inshuro nyinshi kugwiza inshuro nyinshi bikoreshwa nyuma yo kugereranya kubura kwa byombi.Iyo ikimenyetso cya uplink cyoherejwe, ikadiri ya Ethernet yoherejwe mugihe cyagenwe aho iONUyagabanijwe, kandi ingano yamakuru yatanzwe na statistique multiplexing ikoreshwa muguhindura ingano yigihe.
3.3 OLT iringaniza kandi itinda tekinoroji yindishyi kandiONUgucomeka no gukina
Kuberako umuyoboro wo hejuru wa EPON UKORESHA TDMA, ingingo-nyinshi zituma amakuru yatinze kuri buriONUzitandukanye, bityo tekinoroji yo gutinda no gutinza indishyi yatangijwe kugirango hirindwe kugwirirana kwamakuru mugihe cyagenwe.Mu rwego rwo kwirinda kugongana kwamakuru yamakuru yigihe, gupima intera no gutinda kwigihe cyo gukoresha indishyi bigomba gukoreshwa muguhuza icyuho cyigihe cyose. Muri ubu buryo, paki zigera kumwanya wagenwe ukurikije algorithm ya DBA hamwe nugucomeka no gukinaONU.Gupima intera iri hagati ya buriONUto OLTneza no guhindura itinda ryoherejwe ryaONUneza birashobora kugabanya intera iri hagati yo kohereza Windows yaONU, kunoza imikoreshereze yumuyoboro wa uplink no kugabanya gutinda. Urutonde rwa EPON rwatangijwe kandi rwuzuzwa icyarimwe koOLTirengana, ikimenyetso kimwe mugihe icomeka no gukina byaONUni.
3.4Kohereza no kwakira ibimenyetso biturika
Kuva ibimenyetso biturika bya buriONUni Byakiriwe naOLT, OLTikeneye kumenya guhuza icyiciro mugihe runaka hanyuma ikakira amakuru.Ibi bisaba gukoresha ibikoresho bya optique bishobora gushyigikira ibimenyetso biturika muriONUnaOLT.Ibikoresho byinshi bya optique ntibishobora kuzuza iki gisabwa, kandi umubare muto wibikoresho bya optique biturika bifite umuvuduko wakazi wa 155M, bikaba biri hejuru cyane kubiciro. Kubwibyo, kugirango tumenye uburyo bwo guturika neza, tekinoroji idasanzwe ikoreshwa kuri kwakira iherezo. Amashanyarazi ya optique yaturika agomba kuba ashoboye gufunga no gufungura byihuse kandi agashyiraho ibimenyetso byihuse.Niyo mpamvu, moderi gakondo ya electro-optique ihindura moderi ikoresha igenzura ryikora ryikora hamwe nibitekerezo ntigikwiriye gukoreshwa, ariko gisaba lazeri hamwe nigisubizo cyihuse. kwakira iherezo ryakira ibimenyetso byurumuri imbaraga za buri mukoresha biratandukanye ndetse birahinduka. Kubwibyo, muguturika kwakirwa, urwego rwo kwakira (urwego) rugomba guhinduka igihe cyose ikimenyetso gishya cyakiriwe.
4.Gukoresha itumanaho rya fibre optique muri selire
UwitekaONUIrashobora gushirwa kuruhande rwabakiriya (FTTH) cyangwa kuri koridor (FTTB), ariko ibi biri mubireba selile. Muburyo bwa FTTH, umubare wabakoresha nturamenyekana. Muri iki kibazo, kugirango tunoze igipimo cyo gukoresha ibikoresho, kugabanya ibiciro no koroshya kubungabunga. Igenamiterere rya optique igabanya cyane, hamwe no gukoresha urwego rwo gukwirakwiza urumuri, gushyiraho ibintu byinshi muri mudasobwa icyumba cyabaturage cyangwa umuganda imbere mumasanduku yohereza urumuri. Nyuma yubwubatsi muri ubwo buryo, uko umubare wabakoresha wiyongera cyangwa ugabanuka, imikoreshereze yibikoresho irashobora kwiyongera. Ariko, mugihe umubare wabakoresha ari munini, gukenera kubona fibre optique nabyo biziyongera cyane.Mu gihe muburyo bwa FTTB, OMU yashyizwe muri koridor, naho optique igashyirwaho muburyo bumwe na FTTH. Ubu buryo bwo kugera bukorwa muri koridorhindura.
Umwanzuro
Ikoranabuhanga rya EPON rifite ibyiza byinshi, nko gukwirakwiza kwagutse kubakoresha, umuvuduko mwinshi wo hejuru no kumanuka, uburyo bwiza bwo gukwirakwiza optique, kubika umutungo wa fibre kuva kumurongo kugeza kumurongo uhuza ingingo nyinshi nibindi.Ku makuru yijwi, amashusho menshi ya serivise hamwe nabatwara -igikorwa cyiza cyagenewe imyubakire ya tekiniki, ariko kandi ifite pasiporo, nta mashanyarazi yumuriro wa elegitoroniki yumuriro no kurengera ibidukikije.Nkubu buryo bwikoranabuhanga ryitumanaho ryiza, tekinoroji ya EPON ifite akamaro gakomeye.Nkimwe mubikoranabuhanga bikuru bizaza, ikoranabuhanga rya EPON rifite ibiranga yo guhuza n'imihindagurikire y’ibidukikije byoherezwa, kwizerwa cyane no kubungabunga ibidukikije, bigahinduka amahitamo meza yo kubaka umuyoboro mugari uzaza.