Sisitemu ya EPON igizwe nibice byinshi bya optique (ONU), umurongo wa optique (OLT), hamwe numuyoboro umwe cyangwa myinshi optique (reba Ishusho 1). Mu kwagura icyerekezo, ikimenyetso cyoherejwe naOLTni Byatanzwe Kuri ByoseONU. 8h Hindura imiterere yikadiri, ongera usobanure igice cyimbere, hanyuma wongere umwanya nibiranga logique (LLID)). LLID igaragaza buri kimweONUmuri sisitemu ya PON, na LLID isobanurwa mugihe cyo kuvumbura.
(1) Guhindagurika
Muri sisitemu ya EPON, intera igaragara hagati ya buriONUnaOLTmurwego rwo hejuru amakuru yohereza icyerekezo ntabwo angana. Sisitemu rusange ya EPON iteganya ko intera ndende hagatiONUnaOLTni 20km, naho intera ngufi ni 0km. Itandukaniro ryintera rizatera gutinda guhinduka hagati ya 0 na 200 natwe. Niba nta cyuho gihagije cyo kwigunga, ibimenyetso bitandukanyeONUirashobora kugera kumpera yanyuma yaOLTicyarimwe, bizatera amakimbirane yibimenyetso byo hejuru. Amakimbirane azatera amakosa menshi no gutakaza syncronisation, nibindi, bitera sisitemu kunanirwa gukora bisanzwe. Ukoresheje uburyo buringaniye, banza upime intera igaragara, hanyuma uhindure byoseONUKuri intera Yumvikana Nka iOLT, hanyuma ukore uburyo bwa TDMA kugirango ugere ku makimbirane. Kugeza ubu, uburyo bwakoreshwaga bukoreshwa burimo gukwirakwiza-gukwirakwiza ibintu, hanze ya bande no muri bande idirishya rifungura. Kurugero, igihe tagi itondekanya uburyo bukoreshwa mukubanza gupima ibimenyetso bya loop gutinda kuva kuri buriONUKuriOLT, hanyuma ushiremo uburinganire bwihariye gutinda Td agaciro kuri buriONU, kugirango loop itinde igihe cya byoseONUnyuma yo gushiramo Td (Yitwa kuringaniza loop gutinda agaciro Tequ) bingana, ibisubizo bisa nibyo buriONUni Byimuwe Kuri Intera I Nka NkaOLT, hanyuma ikadiri irashobora koherezwa neza ukurikije tekinoroji ya TDMA nta makimbirane. .
(2) Inzira yo kuvumbura
UwitekaOLTisangaONUmuri sisitemu ya PON yohereza Irembo MPCP ubutumwa buri gihe. Iyo wakiriye ubutumwa bw Irembo, utiyandikishijeONUAzategereza igihe kidasanzwe (kugirango wirinde icyarimwe kwiyandikisha byinshiONU), hanyuma wohereze ubutumwa bwanditse kuriOLT. Nyuma yo kwiyandikisha neza ,.OLTKugenera LLID KuriONU.
(3) Ethernet OAM
Nyuma yaONUyiyandikishije kuriOLT, Ethernet OAM kuriONUitangira inzira yo kuvumbura kandi ishyiraho ihuriro hamwe naOLT. Ethernet OAM ikoreshwa kuriONU/OLTamahuza kugirango ushakishe amakosa ya kure, utere kure gusubira inyuma, kandi umenye ubuziranenge bwihuza. Nyamara, Ethernet OAM itanga inkunga kubikorwa byihariye bya OAM PDUs, ibice byamakuru na raporo zigihe. BenshiONU/OLTabayikora bakoresha umugereka wa OAM kugirango bashireho imirimo idasanzwe yaONU. Porogaramu isanzwe ni ukugenzura umurongo wabakoresha ba nyuma hamwe nuburyo bwagutse bwagutse bwagutse muriONU. Iyi porogaramu idasanzwe ni urufunguzo rwikizamini kandi ihinduka inzitizi yo gutumanaho hagatiONUnaOLT.
(4) Kugenda kumanuka
IyoOLTifite traffic yohereza iONU, izatwara LLID amakuru yerekanweONUmu muhanda. Kubera gutangaza ibiranga PON, amakuru yoherejwe naOLTbizatangazwa kuri boseONU. Tugomba cyane cyane gutekereza kumiterere aho traffic traffic yohereza amashusho ya serivise. Bitewe nuburyo bwo gutangaza sisitemu ya EPON, mugihe umukoresha yihitiyemo porogaramu ya videwo, izashyikirizwa abakoresha bose, ikoresha umurongo mugari cyane.OLTmubisanzwe ishyigikira IGMP Snooping. Irashobora guhisha IGMP Kwinjira Gusaba ubutumwa no kohereza amakuru menshi kubakoresha bijyanye niri tsinda aho gutangaza kubakoresha bose, kugabanya traffic muri ubu buryo.
(5) Inzira yo hejuru
Umwe gusaONUirashobora kohereza traffic mugihe runaka. UwitekaONUifite imirongo myinshi yibanze (buri murongo uhuye na QoS urwegoONUKohereza Raporo Ubutumwa KuriOLTgusaba kohereza amahirwe, arambuye uko buri murongo uhagaze. UwitekaOLTKohereza Irembo ubutumwa busubiza iONU, kubwira UwitekaONUigihe cyo gutangira cyoherejwe gikurikirahoOLTigomba gushobora gucunga umurongo wa ibisabwa kuri boseONU, kandi igomba gushyira imbere uruhushya rwo kohereza. Ukurikije ibyingenzi kumurongo no kuringaniza ibyifuzo bya benshiONU, iOLTigomba kuba ishobora gucunga umurongo mugari wa boseONU. Gutanga imbaraga zidasanzwe zo hejuru (ni ukuvuga DBA algorithm).
2.2 Ukurikije ibimenyetso bya tekiniki biranga sisitemu ya EPON, ibibazo byikizamini byahuye na sisitemu ya EPON
(1) Urebye igipimo cya sisitemu ya EPON
Nubwo IEEE802.3ah idasobanura umubare ntarengwa muri sisitemu ya EPON, umubare ntarengwa ushyigikiwe na sisitemu ya EPON ni kuva kuri 16 kugeza 128. BuriONUkwinjira muri sisitemu ya EPON bisaba icyiciro cya MPCP na OAM. Mugihe imbuga nyinshi zifatanije na EPON, ibyago byamakosa ya sisitemu biziyongera. Kurugero, buriONUikeneye kongera kuvumbura inzira, kwinjira no gutangira isomo rya OAM. Kubwibyo, igihe cyo kugarura sisitemu yose kiziyongera numubare waONU.
(2) Ikibazo cyo gutumanaho ibikoresho
Ibice bikurikira birasuzumwa cyane cyane muguhuza ibikoresho:
Dyn Dynamic bandwidth algorithm (DBA) itangwa nababikora batandukanye iratandukanye.
● Bamwe mubakora bakoresha "OrganizaTIon Ibintu Byihariye" bya OAM kugirango bashireho imyitwarire yihariye.
● Niba iterambere rya protokole ya MPCP rihuye rwose.
● Niba intera yo gupima intera yakozwe nababikora batandukanye ihuye nogutunganya amasaha.
(3) Ibyago byihishe mugukwirakwiza serivisi eshatu zo gukina muri sisitemu ya EPON
Bitewe no kwanduza ibiranga EPON, ibyago bimwe byihishe bizatangizwa mugihe cyohereza serivise eshatu zo gukina:
● Hasi yimyanda isesagura umurongo mwinshi: sisitemu ya EPON ikoresha uburyo bwo kohereza amakuru muburyo bwo hasi: buriONUizakira umubare munini wimodoka yoherejwe kubindiONU, guta umurongo mwinshi wo hasi.
Gutinda gutembera hejuru ni binini: Iyo iONUKohereza Ibyatanzwe KuriOLT, igomba gutegereza amahirwe yo kohereza yatanzwe naOLT. KubwibyoONUigomba guhagarika umubare munini wimodoka yo hejuru, izatera gutinda, jitter, no gutakaza paki.
3 Ikoranabuhanga rya EPON
Ikizamini cya EPON gikubiyemo ahanini ibintu byinshi nkikizamini cyimikoranire, ikizamini cya protocole, ikizamini cyo kohereza sisitemu, serivisi no kugenzura imikorere. Ikizamini gisanzwe cya topologiya cyerekanwe mubishushanyo 2. Ibicuruzwa bya IXN2X bya IXIA bitanga ikarita yikizamini cyabigenewe ya EPON, interineti yikizamini cya EPON, irashobora gufata no gusesengura protocole ya MPCP na OAM, irashobora kohereza traffic traffic, gutanga porogaramu yikizamini cyikora, kandi irashobora gufasha abakoresha kwipimisha. DBA algorithms.
