Manetiweki eEPON anotora nzira yeFTTB kugadzira network, uye chikamu chikuru chenetiweki iOLT neONU.OLT inopa akawanda PON ports yepakati hofisi michina yekubatanidza ONU michina;ONU chishandiso chemushandisi chinopa data rinoenderana uye izwi rekupindirana kuti uone kuwana sevhisi yemushandisi.Nekuitwa kwekuwana masevhisi akasiyana, vashandisi vakasiyana uye masevhisi akasiyana anomakwa neakasiyana maVLAN tag kuti aendese pachena kune inoenderana sevhisi yekuwana sevhisi, uye anoenderana maVLAN tag anobviswa uye anotumirwa kune IP mutakuri network kuti itumirwe.
1. EPON network sumo
EPON (Ethernet Passive Optical Network) inyanzvi iri kubuda yefiber yekuwana network.Iyo inotora point-to-multipoint chimiro, passive optical fiber transmission mode, yakavakirwa pa-high-speed Ethernet papuratifomu uye TDM nguva yekuparadzanisa MAC (Media Access Control) midhiya yekuwana control mode., Broadband yekuwana tekinoroji inopa dzakasiyana siyana dzakabatanidzwa masevhisi.Iyo inonzi "passive" inoreva kuti ODN haina chero zvigadzirwa zvemagetsi zvinoshanda uye magetsi emagetsi, uye inoumbwa nemidziyo yepasi senge optical splitters (Splitter).Inotora tekinoroji yePON muchikamu chemuviri, inoshandisa Ethernet protocol muchikamu chekubatanidza, uye inoziva kuwanikwa kweEthernet nekushandisa topology chimiro chePON.Naizvozvo, inosanganisa zvakanakira zvePON tekinoroji uye Ethernet tekinoroji: mutengo wakaderera, wakakwira bandwidth, yakasimba scalability, inochinjika uye nekukurumidza sevhisi kurongeka, kuenderana neiyo iripo Ethernet, nyore maneja uye zvichingodaro.
EPON inogona kuona kubatanidzwa kwezwi, data, vhidhiyo uye nharembozha.Iyo EPON system inonyanya kuumbwa neOLT (optical line terminal), ONU (optical network unit), ONT (optical network terminal) uye ODN (optical distribution network).kupinda.
Active network midziyo inosanganisira yepakati hofisi rack michina (OLT) uye optical network unit (ONU).Optical Network Units (ONUs) inopa vashandisi chimiro pakati pe data, vhidhiyo uye telephony network nePON.Basa rekutanga reONU nderekugamuchira chiratidzo chenzira yekuona uye wochishandura kuita chimiro chinodiwa nemushandisi (Ethernet, IP nhepfenyuro, runhare, T1 / E1, nezvimwewo).Iyo OLT midziyo yakabatana neiyo IP core network kuburikidza neoptical fibers.Iko kuunzwa kweiyo optical access network, kuvharika kwayo kunosvika 20km, inova nechokwadi chekuti OLT inogona kukwidziridzwa kune yechinyakare metro convergence node kubva padanho rekutanga reiyo optical access network yekuvaka, nekudaro kurerutsa iyo network dhizaini yekuwana network convergence layer uye kuchengetedza. simba.nhamba yemahofisi ekupedzisira.Pamusoro pezvo, hunhu hwehukuru hukuru, hukuru hwekusvika bandwidth, kuvimbika kwepamusoro, uye yakawanda-sevhisi QoS nhanho yekutsigira kugona kweiyo optical access network inoitawo kuti shanduko yetiweki yekuwana ive yakabatana, yakachinjika, uye inoshanda yekubereka chikuva chokwadi.
2. Nheyo yekutanga yeEPON network
Iyo EPON sisitimu inoshandisa tekinoroji yeWDM kuona dhairekitori imwe-fiber bidirectional, uchishandisa uplink 1310nm uye downlink 1490nm wavelengths kufambisa data nezwi, nepo CATV masevhisi anoshandisa 1550nm wavelength kutakura.Iyo OLT inoiswa panzvimbo yepakati hofisi kupera kugovera uye kudzora kubatana kwechiteshi, uye ine chaiyo-nguva yekutarisa, manejimendi uye kugadzirisa mabasa.Iyo ONU inoiswa kudivi remushandisi, uye OLT neONU zvakabatanidzwa mune 1:16/1:32 modhi kuburikidza neinongoitika yekugovera network network.
Kuti uparadzanise zvikwangwani zvekufamba-famba zvevashandisi vakawanda pane imwe fiber, nzira mbiri dzinotevera dzekuwedzera dzinogona kushandiswa.
1) Iyo downlink data stream inotora tekinoroji yekutepfenyura.MuEPON, nzira yekufambisa data yakadzika kubva kuOLT kuenda kune akawanda ONU inotumirwa nenzira yekutepfenyura data.Data inotepfenyurwa yakadzika kubva kuOLT kuenda kune akawanda maONU nenzira yemapaketi akareba.Pakiti rega rega reruzivo rine musoro weEPON, unozivisa zvakasiyana kuti pakiti yeruzivo yakatumirwa kuONU-1, ONU-2 kana ONU-3.Iyo inogona zvakare kuzivikanwa seyekutepfenyura pakiti kune ese maONU kana kune chaiyo ONU boka (multicast mapaketi).Kana iyo data yasvika paONU, ONU inogamuchira uye inoziva mapepa emashoko anotumirwa kwairi kuburikidza nekero yekuenzanisa, uye inorasa mapepa emashoko anotumirwa kune mamwe maONU.Mushure mekunge ONU yanyoreswa seinoshanda, yakasarudzika LLID inopihwa;iyo OLT painogashira data, inofananidza iyo LLID yekunyoresa runyorwa.Kana ONU ikagamuchira data, inongogashira mafuremu kana nhepfenyuro dzinoenderana neLLID yayo.
2) Iyo yekumusoro data rukova inotora TDMA tekinoroji.Iyo OLT inoenzanisa iyo LLID yekunyoresa runyorwa isati yagamuchira data;ONU yega yega inotumira maforemu edata munguva yakagoverwa zvakafanana nemidziyo yepakati yehofisi OLT;iyo yakagoverwa nguva slot (kuburikidza nearanging tekinoroji) inotsiva mutsauko wedaro pakati peONU yega yega uye inodzivirira imwe neimwe yeONU kudhumhana pakati.
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