I-EPON ne-GPON banokufaneleka kwabo.Kusukela kunkomba yokusebenza, i-GPON iphakeme kune-EPON, kodwa i-EPON inezinzuzo zesikhathi nezindleko.I-GPON iyabamba.Uma sibheke phambili emakethe yokufinyelela ye-broadband yesikhathi esizayo, kungase kungabi ukuthi ubani othatha indawo kabani, kufanele kuhlalisane futhi kuhambisane.Ukuze uthole umkhawulokudonsa, izinsizakalo eziningi, i-QoS ephezulu kanye nezidingo zokuphepha, kanye namakhasimende anobuchwepheshe be-ATM njengenethiwekhi yomgogodla, i-GPON izofaneleka kakhulu.Kumaqembu amakhasimende azwela izindleko, i-QoS, nazokuphepha eziphansi, i-EPON isihamba phambili.
Yini i-PON?
Ubuchwepheshe bokufinyelela ku-Broadband buyadlondlobala, bumiselwe ukuba yinkundla yempi lapho intuthu ingasoze yashabalala.Njengamanje, umkhakha wasekhaya usewubuchwepheshe be-ADSL, kodwa abakhiqizi bemishini abaningi ngokwengeziwe kanye nabaqhubi baphendule ukunaka kwabo kubuchwepheshe bokufinyelela kwenethiwekhi ye-optical.
Izintengo zethusi ziyaqhubeka nokukhuphuka, amanani entengo yekhebula yokubona ayaqhubeka nokwehla, futhi isidingo esikhulayo somkhawulokudonsa ovela ku-IPTV nezinsizakalo zegeyimu yevidiyo kuqhuba ukuthuthukiswa kwe-FTTH.Amathemba aqhakazile okushintsha izintambo ze-coaxial zethusi nezintambo ngezintambo zokubona, ucingo, i-cable TV, ne-broadband data triplet acaca kakhudlwana.
Inethiwekhi ye-PON (Inethiwekhi ye-Passive OpTIcal) iwubuchwepheshe obuyinhloko bokuthola ifayibha ye-FTTH ekhaya, ehlinzeka ngokufinyelela i-point-to-multipoint fiber.Njengoba kukhonjisiwe kuMfanekiso 1, uqukethe i-OLT (itheminali yomugqa obonakalayo) ohlangothini lwehhovisi kanye nohlangothi lomsebenzisi Ihlanganiswe i-ONU (Optical Network Unit) kanye ne-ODN (Optical Distribution Network).Ngokuvamile, indlela eya phansi isebenzisa ukusakaza kwe-TDM kanti eya phezulu isebenzisa i-TDMA (Isigaba Sesikhathi Sokufinyelela Okuningi) ukuze kwakhiwe i-topology yesihlahla esikhomba-kuya-kumaphuzu amaningi.I-PON, njengendawo enkulu ekhanyayo yobuchwepheshe bokufinyelela kokubona, “ayinalutho”.I-ODN ayinazo izisetshenziswa zikagesi ezisebenzayo kanye nempahla yamandla kagesi.Wonke akhiwe ngamadivaysi angenzi lutho njengama-optical splitters (Splitter).Izindleko zokuphatha, ukunakekela kanye nokusebenza ziphansi.
Izici zobuchwepheshe ze-EPON ne-GPON
I-EPON ihlose ukusebenzisana nobuchwepheshe bamanje be-Ethernet.Ukuqhubeka kwephrothokholi ye-802.3 kunethiwekhi yokufinyelela optical.Izuza ngokugcwele izinzuzo zamanani aphansi e-Ethernet, izivumelwano ezivumelana nezimo, nobuchwepheshe obuvuthiwe.Inemakethe ebanzi nokuhambisana okuhle.I-GPON ibekwe embonini yezokuxhumana ngezidingo zezinsizakalo eziningi, ukufinyelela kwenkonzo egcwele ngesiqinisekiso se-QoS, futhi ilwela ukuthola isisombululo esifanele esisekela zonke izinsizakalo futhi esisebenza kahle kakhulu, iphakamisa “ukucatshangelwa kabusha okuvulekile nokuphelele kwazo zonke izivumelwano ngokukhululekile. ”.
Izici zobuchwepheshe ze-EPON zimi kanje:
1) I-Ethernet iyisithwali esingcono kakhulu sokuphatha izinsizakalo ze-IP;
2) Ukugcinwa okulula, ukunwetshwa kulula, kulula ukuthuthukisa;
3) Imishini ye-EPON ivuthiwe futhi iyatholakala.I-EPON ibeke izigidi zemigqa e-Asia.Ama-chips esizukulwane sesithathu esethulwe.Izintengo zamamojula ahlobene optical kanye nama-chips ehle kakhulu, afinyelela esikalini sokusetshenziswa kwezentengiso, esingahlangabezana nezidingo zebhizinisi le-broadband zakamuva;
4) Iphrothokholi ye-EPON ilula futhi izindleko zokuqalisa ziphansi, futhi izindleko zemishini ziphansi.Ubuchwepheshe obufaneleke kakhulu buyadingeka kunethiwekhi yokufinyelela ku-metro, hhayi ubuchwepheshe obungcono kakhulu;
I-5) Ilungele kakhulu inethiwekhi yasekhaya, yedolobha elikhulu ngaphandle komthwalo wemishini ye-ATM noma ye-BPON;
I-6) Ifaneleka kakhulu ikusasa, i-IP iphatha zonke izinsizakalo, futhi i-Ethernet ithwala izinsizakalo ze-IP.
Izici zobuchwepheshe ze-GPON zimi kanje:
1) Inethiwekhi yokufinyelela yemisebenzi ye-telecom;
I-2) Umkhawulokudonsa ophezulu: isilinganiso somugqa, phansi komfula 2.488Gb / s, umfula okhuphukayo 1.244Gb / s;I-3) Ukusebenza kahle kokudlulisa: ukuziphatha okuphansi kwe-94% (umkhawulokudonsa wangempela kuze kufike ku-2.4G) ukuziphatha okuphezulu kwe-93% (umkhawulokudonsa wangempela kuze kufike ku-1.1G);
3) Ukusekelwa kwesevisi ephelele: Izinga le-G.984.X lichaza ngokuqinile ukusekelwa kwezinsizakalo ezigcwele zebanga lenkampani yenethiwekhi (izwi, idatha nevidiyo);
I-4) Ikhono lokuphatha eliqinile: ngemisebenzi ecebile, isizinda se-OAM esanele sigcinwe esakhiweni sefreyimu, futhi amazinga e-OMCI ayakhiwa;
I-5) Ikhwalithi yesevisi ephezulu: amazinga amaningi we-QoS angaqinisekisa ngokuqinile umkhawulokudonsa kanye nezidingo zokulibaziseka kwebhizinisi;
6) Izindleko eziphelele eziphansi: Ibanga elide lokudlulisela kanye nesilinganiso sokuhlukaniswa okuphezulu, esabalalisa ngempumelelo izindleko ze-OLT futhi sinciphise izindleko zokufinyelela komsebenzisi.
Yikuphi okungcono, i-EPON vs GPON?
1. Izindinganiso ezithathwe yi-EPON kanye ne-GPON zihlukile.Kungashiwo ukuthi i-GPON ithuthuke kakhulu futhi ingadlulisela umkhawulokudonsa omningi, futhi ingaletha abasebenzisi abaningi kune-EPON.I-GPON yavela kubuchwepheshe bokuqala be-APON \ BPON bokuxhumana kwe-fiber optical, eyasungulwa kulokhu.Ifomethi yohlaka lwe-ATM isetshenziselwa ukudlulisa ukusakaza kwekhodi.I-E ye-EPON ibhekisela ku-Ethernet exhumene, ngakho-ke ekuqaleni kokuzalwa kwe-EPON, kwakudingeka ukuthi ikwazi ukuxhuma ngokuqondile nangokukhululekile ne-inthanethi, ukuze ukusakaza kwekhodi ye-EPON ifomethi yefreyimu ye-Ethernet.Yebo, ukuze uvumelane nokudluliswa kwe-fiber optical, ifomethi yefreyimu echazwe yi-EPON isongwe ngaphandle kohlaka lwefomethi yefreyimu ye-Ethernet.
2. Izinga le-EPON lithi IEEE 802.3ah.Umgomo oyisisekelo we-IEEE ukwenza izinga le-EPON ukulinganisa i-EPON ngaphakathi kwezakhiwo ezingu-802.3 ngangokunokwenzeka, futhi kwandiswe iphrothokholi ye-MAC ye-Ethernet evamile ibe sezingeni elincane.
3. Izinga le-GPON uchungechunge lwamazinga e-ITU-TG.984.Ukwakhiwa kwezinga le-GPON kucabangela ukusekelwa kwezinsizakalo ze-TDM ezivamile futhi kuyaqhubeka nokusebenzisa uhlaka olumisiwe lwe-125ms ukuze kugcinwe ukuqhubeka kwesikhathi kwe-8K.Ukuze kusekelwe amaphrothokholi amaningi njenge-ATM, i-GPON ichaza isakhiwo esisha sha sokufaka i-GEM: GPONEncapsulaTIonMethod.Idatha ye-ATM namanye amaphrothokholi ingaxutshwa futhi ihlanganiswe ibe ozimele.
4. Mayelana nesicelo, i-GPON inomkhawulokudonsa omkhulu kune-EPON, umphathi wayo wesevisi usebenza kahle kakhulu, futhi ikhono layo lokuhlukanisa i-optical linamandla.Ingakwazi ukudlulisa izinsizakalo ezinkulu zomkhawulokudonsa, ibone ukufinyelela okwengeziwe komsebenzisi, inake kakhulu isiqinisekiso se-QoS sezinsizakalo eziningi, kodwa ifinyelele okwengeziwe Iyinkimbinkimbi, okwenza izindleko zayo zibe phezulu kakhulu kune-EPON, kodwa ngokusetshenziswa okukhulu. yobuchwepheshe be-GPON, umehluko wezindleko phakathi kwe-GPON ne-EPON uyancipha kancane kancane.