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 ahaniniOLT(umurongo wa optique)ONU. Ni murwego rwo kugera kumurongo wurusobe kandi birakwiriye cyane cyane guhuza fibre optique ya serivise yagutse. Into.
Ibikoresho byurusobe rukora birimo ibikoresho byo mu biro bikuru (OLT) hamwe na optique y'urusobe (ONU). Igice cya optique (ONU) itanga abakoresha intera hagati yamakuru, videwo, numuyoboro wa terefone na PON. Uruhare rwambere rwaONUni kwakira ibimenyetso bya optique hanyuma ukabihindura muburyo busabwa numukoresha (Ethernet, IP isakaza, terefone, T1 / E1, nibindi).OLTibikoresho 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. UwitekaOLTishyirwa mu biro bikuru kugirango ikwirakwize kandi igenzure ihuza ry'umuyoboro, kandi ifite ibikorwa nyabyo byo gukurikirana, gucunga no gufata neza. UwitekaONUni Kuri i Umukoresha Uruhande, naOLTnaONUbahujwe 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 kumanura amakuru yoherejwe kuva kuriOLTKuri byinshiONUyoherejwe namakuru yo gutangaza amakuru. Ibyatanzwe Byanyuze Hasi Kuva iOLTKuri byinshiONUmuburyo bwa variable-uburebure bwamakuru paki. Buri paki yamakuru afite umutwe wumutwe wa EPON, ugaragaza bidasanzwe niba amakuru yamakuru yoherejweONU-1,ONU-2 cyangwaONU-3. Irashobora kandi gushyirwaho ikimenyetso cyo gutangaza amakuru yoherejwe kuri boseONUcyangwa kuri runakaONUitsinda (paketi yamakuru menshi). Iyo amakuru ageze kuriONU, iONUyakira kandi ikamenya amakuru yamapaki yoherejwe kuri aderesi ihuye, kandi ikajugunya amakuru yamapaki yoherejwe kubindiONU. LLID idasanzwe yatanzwe nyuma yaONUyanditswe; iOLTkugereranya LLID kwiyandikisha kurutonde mugihe wakiriye amakuru, nigihe iyoONUyakira amakuru, yakira gusa amakadiri cyangwa gutangaza amakadiri ahuye na LLID yayo.
(2) Hejuru yamakuru atemba akoresha tekinoroji ya TDMA. UwitekaOLTkugereranya urutonde rwa LLID mbere yo kwakira amakuru; buri umweONUKohereza amakuru kumurongo mugihe cyagenwe kimwe nibikoresho byo mubiro bikuruOLT; umwanya wagenwe (binyuze mu ikorana buhanga) yishyura icyuho kiri hagati ya buriONUkandi yirinda buri kimweONUKugongana hagati.
