Uthungelwano lwe-EPON lwamkela indlela ye-FTTB yokwenza uthungelwano, kwaye iyunithi esisiseko yothungelwano yi-OLT kunye ne-ONU.I-OLT ibonelela ngamazibuko e-PON amaninzi kwizixhobo zeofisi ephakathi ukuqhagamshela izixhobo ze-ONU;I-ONU sisixhobo somsebenzisi esibonelela ngedatha ehambelanayo kunye nojongano lwezwi ukuqonda ukufikelela kwenkonzo yomsebenzisi.Ukuphunyezwa kokufikelela kwiinkonzo ezahlukeneyo, abasebenzisi abahlukeneyo kunye neenkonzo ezahlukeneyo ziphawulwe ngeethegi ezahlukeneyo zeVLAN ukuhambisa ngokucacileyo kwi-server yokufikelela kwinkonzo ehambelanayo, kwaye iithegi zeVLAN ezihambelanayo ziyahluthwa kwaye zithunyelwe kwinethiwekhi ye-IP yokuhambisa.
1. Intshayelelo yenethiwekhi ye-EPON
I-EPON (i-Ethernet Passive Optical Network) yiteknoloji yofikelelo lwefiber yefiber evelayo.Yamkela i-point-to-multipoint structure, i-passive optical fiber transmission mode, esekelwe kwi-platform ye-Ethernet ye-high-speed kunye ne-TDM yecandelo lexesha le-MAC (i-Media Access Control) imodi yokulawula ukufikelela kwimidiya., iteknoloji yokufikelela kwi-Broadband ebonelela ngeenkonzo ezahlukeneyo ezidibeneyo.Into ebizwa ngokuba "yi-passive" ithetha ukuba i-ODN ayinayo nayiphi na i-electronic device esebenzayo kunye nombane osebenzayo, kwaye iqulunqwe izixhobo ezingabonakaliyo ezifana ne-optical splitters (Splitter).Yamkela iteknoloji ye-PON kwinqanaba lomzimba, isebenzisa i-Ethernet protocol kwi-link layer, kwaye iqonda ukufikelela kwe-Ethernet ngokusebenzisa i-topology structure ye-PON.Ngoko ke, idibanisa iingenelo zeteknoloji ye-PON kunye nobuchwepheshe be-Ethernet: ixabiso eliphantsi, i-bandwidth ephakamileyo, i-scalability eqinile, ukuguquguquka kunye nokulungelelaniswa kwenkonzo ngokukhawuleza, ukuhambelana ne-Ethernet ekhoyo, ulawulo olulula njalo njalo.
I-EPON inokuqonda ukudityaniswa kwelizwi, idatha, ividiyo kunye neenkonzo zeselula.Inkqubo ye-EPON iqulunqwe kakhulu yi-OLT (i-terminal ye-optical line), i-ONU (iyunithi yenethiwekhi ye-optical), i-ONT (i-terminal ye-optical network) kunye ne-ODN (inethiwekhi yokusabalalisa i-optical).ngena.
Izixhobo zenethiwekhi ezisebenzayo ziquka izixhobo zokubeka i-ofisi ephakathi (OLT) kunye neyunithi yenethiwekhi ye-optical (ONU).I-Optical Network Units (ONUs) ibonelela abasebenzisi nge-interface phakathi kwedatha, ividiyo kunye neenethiwekhi zocingo kunye ne-PON.Umsebenzi wokuqala we-ONU kukufumana isignali yendlela ye-optical kwaye uyiguqule kwifomathi efunwa ngumsebenzisi (i-Ethernet, ukusasazwa kwe-IP, umnxeba, T1 / E1, njl.).Izixhobo ze-OLT zixhunywe kwinethiwekhi ye-IP engundoqo ngokusebenzisa imicu ye-optical.Ukuqaliswa kwenethiwekhi yokufikelela kwi-optical access, i-coverage yayo ifikelela kwi-20km, iqinisekisa ukuba i-OLT inokuphuculwa kwi-metro convergence node yemveli ukusuka kwinqanaba lokuqala lolwakhiwo lwenethiwekhi yokufikelela kwi-optical, ngaloo ndlela ilula isakhiwo sothungelwano lwe-network access layer convergence layer kunye nokugcina. amandla.inani leeofisi zokuphela.Ukongezelela, iimpawu zomthamo omkhulu, i-bandwidth ephezulu yokufikelela, ukuthembeka okuphezulu, kunye ne-multi-service QoS yenkxaso yezinga lenkxaso yenethiwekhi yokufikelela kwi-optical access iphinda yenza ukuguquka kwenethiwekhi yokufikelela kwi-platform ye-bearing edibeneyo, edibeneyo, kunye neyokwenene.
2. Umgaqo osisiseko we-EPON network
Inkqubo ye-EPON isebenzisa iteknoloji ye-WDM ukuqonda ukuhanjiswa kwe-bidirectional ye-fiber enye, usebenzisa i-uplink 1310nm kunye ne-downlink 1490nm wavelengths ukuhambisa idatha kunye nezwi, ngelixa iinkonzo ze-CATV zisebenzisa i-1550nm wavelength ukuthwala.I-OLT ibekwe ekupheleni kwe-ofisi ephakathi ukuze isasaze kwaye ilawule uxhulumaniso lwejelo, kwaye inomsebenzi wexesha langempela lokubeka iliso, ulawulo kunye nokugcinwa.I-ONU ibekwe kwicala lomsebenzisi, kwaye i-OLT kunye ne-ONU zidibaniswe kwimodi ye-1:16 / 1:32 ngokusebenzisa inethiwekhi yokusabalalisa optical passive.
Ukuze ukwahlula imiqondiso yokuhamba nokubuya yabasebenzisi abaninzi kwifiber enye, ezi ndlela zimbini zilandelayo zokuphindaphinda zinokusetyenziswa.
1) I-downlink data stream ithatha iteknoloji yosasazo.Kwi-EPON, inkqubo yokuhanjiswa kwedatha ezantsi ukusuka kwi-OLT ukuya kwii-ONU ezininzi ithunyelwa ngokusasazwa kwedatha.Idatha isasazwa ezantsi ukusuka kwi-OLT ukuya kwii-ONU ezininzi ngendlela yeepakethi zobude obuguquguqukayo.Ipakethe nganye yolwazi ineheda ye-EPON, echonga ngokukodwa ukuba ipakethi yolwazi ithunyelwe ku-ONU-1, ONU-2 okanye ONU-3.Isenokuchongwa njengepakethi yosasazo kuzo zonke ii-ONU okanye kwiqela elithile le-ONU (iipakethe ezininzi).Xa idatha ifika kwi-ONU, i-ONU ifumana kwaye ibone iipakethi zolwazi ezithunyelwe kuyo ngokuhambelana nedilesi, kwaye ilahle iipakethi zolwazi ezithunyelwe kwezinye ii-ONU.Emva kokuba i-ONU ibhalisiwe njengesebenzayo, i-LLID eyodwa inikezelwe;xa i-OLT ifumana idatha, ithelekisa uluhlu lobhaliso lwe-LLID.Xa i-ONU ifumana idatha, ifumana kuphela izakhelo okanye izakhelo zosasazo ezihambelana ne-LLID yayo.
I-2) Umlambo wedatha onyukayo wamkela iteknoloji ye-TDMA.I-OLT ithelekisa uluhlu lobhaliso lwe-LLID ngaphambi kokufumana idatha;i-ONU nganye ithumela iifreyimu zedatha kwixesha le-slot elabelwe ngokufanayo zizixhobo ze-ofisi ephakathi OLT;ixesha elibekiweyo (ngokusebenzisa itekhnoloji eqalayo) ihlawulela umahluko womgama phakathi kwe-ONU nganye kwaye inqanda ukungqubana kwe-ONU nganye phakathi.
https://720yun.com/t/d3vkbl8hddl?scene_id=86634935
https://www.smart-xlink.com/products.html