1. Intangiriro y'urusobe rwa EPON
EPON. Tanga uburyo butandukanye bwo gukoresha umurongo mugari wa serivisi zihuriweho.Ibyo bita "pasiporo" bivuze ko ODN idafite ibikoresho bya elegitoroniki bikora nibikoresho bitanga ingufu, kandi byose bigizwe nibikoresho bya pasiporo nka optique ya optique (Splitter).Ikoresha tekinoroji ya PON kurwego rwumubiri, protocole ya Ethernet kumurongo uhuza, kandi ikoresha topologiya ya PON kugirango igere kuri Ethernet.Kubwibyo, ikomatanya ibyiza byikoranabuhanga rya PON hamwe na tekinoroji ya Ethernet: igiciro gito, umurongo mwinshi, kwaguka gukomeye, kuvugurura serivisi byihuse kandi byihuse, guhuza na Ethernet ihari, gucunga neza, nibindi.
EPON irashobora kumenya guhuza amajwi, amakuru, videwo, na serivisi zigendanwa.Sisitemu ya EPON igizwe ahanini na OLT (umurongo wa optique),ONU.Ni murwego rwo kugera kumurongo wurusobe kandi birakwiriye cyane cyane guhuza fibre optique ya serivise yagutse.Into.
Ibikoresho bifatika byurusobe birimo ibikoresho byo mu biro bikuru (OLT) hamwe nuyoboro wa optique (ONU).Igice cya optique (ONU) gitanga abakoresha intera hagati yamakuru, videwo, numuyoboro wa terefone na PON.Uruhare rwambere rwa ONU nukwakira ibimenyetso bya optique hanyuma ukabihindura muburyo busabwa numukoresha (Ethernet, IP isakaza, terefone, T1 / E1, nibindi).Ibikoresho bya OLT bihujwe numuyoboro wa IP ukoresheje fibre optique.Itangizwa rya optique yo kubona imiyoboro ifite ubwirinzi bugera kuri 20km, byemeza koOLTIrashobora kuzamurwa kuri gakondo ya metropolitan ihuza node kuva murwego rwambere rwo kubaka imiyoboro ya optique, bityo byoroshya imiterere y'urusobekerane rw'urwego rwo guhuza imiyoboro no kuzigama Umubare wibiro byanyuma.Mubyongeyeho, ibiranga imiyoboro ya optique igera kumurongo munini, kwaguka kwinshi, kwizerwa cyane, hamwe na serivise nyinshi za QoS urwego rwo gufashanya nabyo byatumye ihindagurika ryurusobe rwinjira rugana kumurongo uhuriweho, uhuriweho, kandi ukora neza.
2. Amahame shingiro yumurongo wa EPON
Sisitemu ya EPON ikoresha tekinoroji ya WDM kugirango imenye icyerekezo kimwe cya fibre fibre imwe, ikoresheje epfo na ruguru 1310nm no kumanuka wa 1490nm uburebure bwumurongo wohereza amakuru nijwi, kandi serivisi za CATV zikoresha uburebure bwa 1550nm.OLT ishyirwa mu biro bikuru kugirango ikwirakwize kandi igenzure imiyoboro ihuza, kandi ifite ibikorwa nyabyo byo gukurikirana, gucunga no gufata neza.ONU ishyirwa kuruhande rwabakoresha, kandi OLT na ONU bihujwe muburyo bwa 1: 16/1: 32 binyuze mumurongo wo gukwirakwiza optique.Kugirango utandukanye ibimenyetso nabakoresha benshi kuri fibre imwe, tekinike ebyiri zikurikira zirashobora gukoreshwa.
(1) Inzira yo hasi yamakuru ikoresha tekinoroji yo gutangaza.Muri EPON, inzira yo kohereza amakuru yoherejwe kuva OLT kuri ONU nyinshi yoherejwe no gutangaza amakuru.Amakuru yatangajwe hepfo kuva OLT kugeza kuri ONU nyinshi muburyo bwimpinduka-ndende yamakuru.Buri paki yamakuru afite umutwe wumutwe wa EPON, ugaragaza bidasanzwe niba paki yamakuru yoherejwe kuri ONU-1, ONU-2 cyangwa ONU-3.Irashobora kandi gushyirwaho ikimenyetso cyo gutangaza amakuru yoherejwe kuri ONU zose cyangwa mumatsinda yihariye ya ONU (packet yamakuru menshi).Iyo amakuru ageze kuri ONU, ONU yakira kandi ikamenya paki yamakuru yoherejwe kuri aderesi ihuza, kandi ikajugunya amakuru yamakuru yoherejwe kubandi ONU.LLID idasanzwe yatanzwe nyuma yuko ONU yiyandikishije;OLT igereranya urutonde rwa LLID mugihe rwakira amakuru, kandi iyo ONU yakiriye amakuru, yakira gusa amakadiri cyangwa ikadiri yo gutangaza ihuye na LLID yayo.
(2) Hejuru yamakuru atemba akoresha tekinoroji ya TDMA.OLT igereranya urutonde rwa LLID mbere yo kwakira amakuru;buri ONU yohereza amakuru kumurongo mugihe cyagenwe kimwe nibikoresho byo mubiro bikuru OLT;umwanya wagenwe (binyuze mu ikoranabuhanga rinini) wishyura icyuho kiri hagati ya buri ONU kandi wirinda guhura kwa ONU hagati.
