1.PON Intshayelelo
(1)Yintoni iPON
I-PON (i-passive optical network) iteknoloji (kubandakanywa ne-EPON, i-GPON) iyona teknoloji yophunyezo oluphambili lokuphuhliswa kweFTTx (i-fiber ukuya ekhaya). Inokugcina izibonelelo zefiber ye-backbone kunye namanqanaba enethiwekhi, kwaye inokubonelela ngeendlela ezimbini eziphezulu ze-bandwidth phantsi kweemeko zokuhambisa umgama omde. Kukho iintlobo ezityebileyo zeenkonzo zokufikelela, kwaye amandla ayo olawulo olukude kunye ne-passive optical distribution network structure inokunciphisa kakhulu iindleko zokusebenza kunye nokugcinwa, kwaye inokuxhasa iimeko ezininzi zesicelo.
(2) Uphuhliso lobuchwephesha bePON
Ukususela ekuveleni kwe-PON, sele iphuhlisa iminyaka emininzi, isenza uluhlu lweengcamango, iinkcukacha kunye nokulandelelana kwemveliso efana ne-APON, i-BPON, i-EPON, kunye ne-GPON.
I-APON (ATMPON)
I-ATM yi-cell-based transmission protocol. I-155Mb / s inkqubo ye-PON yenkcazo yezobugcisa, imigangatho ye-ITU-TG.983 yochungechunge;
I-BPON (BroadbandPON)
Umgangatho we-APON womelezwa kamva ukuxhasa izinga lothumelo lwe-622Mb / s, ngelixa ukongeza imisebenzi efana nolwabiwo lwe-bandwidth kunye nokukhusela.
I-EPON (i-Ethernet PON)
IGPON (GigabitPON)
(3) Itekhnoloji yokufikelela kwifiber ye-Optical
2.EPON intshayelelo
(1) Yintoni i-EPON?
I-EPON (i-Ethernet Passive Optical Network) luhlobo lwe-point-to-multipoint network structure, i-passive optical optical transmission method, esekelwe kwi-high-speed Ethernet iqonga kunye ne-TDM (ixesha lokwahlula i-multiplexing) ixesha lokwahlula i-MAC indlela yokulawula ukufikelela kwimidiya, ukubonelela ngee-multiple An. iteknoloji yenkonzo ehlanganisiweyo yokufikelela kwibroadband.
Inkqubo ye-EPON isebenzisa itekhnoloji ye-WDM ukuqonda ukuhanjiswa kwe-fiber enye ye-bidirectional.
(2) Umgaqo we-EPON
Ukuze ukwahlula izibonakaliso ezingenayo kunye neziphumayo zababini abasebenzisi abaninzi kwifiber efanayo, ezi ndlela zimbini zokuphindaphinda zisetyenziswa.
a. Umjelo wedatha osezantsi usebenzisa iteknoloji yokusasaza.
b. Umsinga wedatha onyukayo wamkela itekhnoloji yeTDMA.
(3)Umgaqo we-EPON-downstream
a. Yabela i-LLID eyodwa emva kweI-ONUibhaliswe ngempumelelo.
b. Yongeza i-LLID phambi kokuqala kwepakethi nganye ukuze ubuyisele iibhayithi ezimbini zokugqibela zentshayelelo ye-Ethernet.
c. Thelekisa uluhlu lobhaliso lwe-LLID xa iOLTifumana idatha. Xa iI-ONUifumana idatha, ifumana kuphela izakhelo okanye izakhelo zosasazo ezihambelana ne-LLID yayo.
(4) Umgaqo we-EPON-Uplink
a. Thelekisa uluhlu lobhaliso lwe-LLID phambi kweOLTifumana idatha.
b. NgamnyeI-ONUithumela isakhelo sedatha kwixesha elibekiweyo elinikezelwe ngokufanayo zizixhobo zeofisi.
c. Ixesha elabelwe ukufakwa libuyekeza umsantsa womgama phakathi kweIi-ONUkwaye inqanda ukungqubana phakathi kweIi-ONU.
(5) Inkqubo yokusebenza kwenkqubo ye-EPON
OLTukusebenza
a. Yenza imiyalezo yesitampu sexesha ngexesha lereferensi yenkqubo.
b. Yabela i-bandwidth ngokusebenzisa izakhelo zeMPCP. 3. Yenza imisebenzi eyahlukahlukeneyo.
c. UlawuloI-ONUubhaliso.
I-ONUukusebenza
a. II-ONUingqamanisa neOLTngokusebenzisa isitampu sexesha lesakhelo solawulo esisezantsi.
b. I-ONUilindele isakhelo sokufunyanwa.
c. I-ONUyenza inkqubo yokufumanisa, kubandakanywa: ukusuka, ukucacisa i-ID yomzimba kunye ne-bandwidth.
d. I-ONUilindele ugunyaziso,I-ONUingathumela kuphela idatha ngexesha eligunyazisiweyo.
(6) Uyilo lwenkqubo yolawulo lwenethiwekhi ye-EPON
Inkqubo yolawulo lwenethiwekhi ye-EPON ihlukaniswe kwiimodyuli ezine ngokwemisebenzi yolawulo lwenethiwekhi: ulawulo lokucwangciswa, ukulawulwa kokusebenza, ulawulo lwempazamo kunye nolawulo lokhuseleko.
(7) Ukufezekiswa kwenkqubo yolawulo lwenethiwekhi ye-EPON
a. Ukufezekiswa kwenkqubo yolawulo lwenethiwekhi ye-EPON kubandakanya ukufezekiswa kwesoftware yolawulo lwenethiwekhi yesitishi solawulo kunye nokufezekiswa kwesoftware yesitishi searhente.
b. Inkqubo yolawulo lwenethiwekhi yesitishi solawulo liziko lolawulo elibonelela abasebenzisi nge-interface esebenzayo enobuhlobo kwaye isebenzisa iprotocol ye-SNMP yokulawula inkqubo ye-arhente.
c. Ukufezekiswa kwe-SNMP kwisikhululo se-ejenti ikakhulu kubandakanya ukufezekiswa kwenkqubo ye-agent software kunye noyilo kunye nombutho we-MIB.
3. Intshayelelo yeGPON
(1) Yintoni iGPON?
IGPON (I-Gigabit-CapablePON ye-Gigabit Passive Optical Network) ubuchwephesha sesona sizukulwana samva nje ibroadband passive optical access idityanisiwe umgangatho wofikelelo osekwe kwi-ITU-TG.984.x (International Telecommunication Union TG.984.x) umgangatho, kunye ne-bandwidth ephezulu, Ukusebenza okuphezulu, ukugubungela okukhulu, ujongano lomsebenzisi otyebileyo kunye nezinye ezininzi. Izibonelelo zithathwa ngabasebenzisi abaninzi njengobuchwephesha obufanelekileyo bokuqonda ibroadband kunye nenguqu ebanzi yokufikelela kwiinkonzo zenethiwekhi.
(2）umgaqo weGPON
GPON usasazo ezantsi-kusasaza transmission
Imowudi ye-GPONS enyukayo-TDMA
I-topology yenethiwekhi ye-passive optical fiber transmission mode yenziwa ikakhuluOLT(i-terminal yomgca we-optical), i-ODN (inethiwekhi yokusabalalisa i-optical), kunyeI-ONU(iyunithi yenethiwekhi ebonakalayo).
I-ODN ibonelela ngeendlela zokuhanjiswa kwe-optical forOLTkwayeI-ONU. Iqulathe i-passive optical splitter kunye ne-passive optical combineer. Sisixhobo sokwenziwa esidibanisayoOLTkwayeI-ONU.
(3) GPON umgaqo-phezulu
a. Ukuhanjiswa kwedatha enyukayo kulawulwa ngokufanayo yiOLT.
b. II-ONUihambisa idatha yomsebenzisi ngokwexesha elibekiweyo elinikezelwe yiOLTukuphepha ungquzulwano lothumelo lwedatha oluveliswa yiI-ONU.
c. II-ONUifaka idatha ye-uplink ngexesha layo lokubeka ngokuhambelana nesakhelo sokwabiwa kwexesha, ukuqonda ukwabelana nge-bandwidth yesitishi se-uplink phakathi kwezinto ezininzi.Ii-ONU.
(4) Imowudi yothungelwano lweGPON
IGPON isebenzisa ikakhulu iindlela ezintathu zothungelwano: FTTH/O, FTTB+LAN kunye neFTTB+DSL.
a. I-FTTH/O yifayibha ukuya ekhaya/eofisini. Emva kokuba i-fiber optical ingena kwi-splitter, ixhunywe ngokuthe ngqo kumsebenzisiI-ONU. AnI-ONUisetyenziswe kuphela ngumsebenzisi omnye, kunye ne-bandwidth ephezulu kunye neendleko eziphezulu, kwaye ngokuqhelekileyo ijoliswe kubasebenzisi abaphezulu kunye nabasebenzisi bezorhwebo.
b. I-FTTB + LAN isebenzisa ifayibha ukufikelela kwisakhiwo, kwaye emva koko idibanisa iinkonzo ezahlukeneyo kubasebenzisi abaninzi ngokusebenzisa umthamo omkhulu.I-ONU(ebizwa ngokuba yi-MDU). Ke ngoko, abasebenzisi abaninzi babelana ngemithombo ye-bandwidth yesinyeI-ONU, kwaye umntu ngamnye uhlala kwi-bandwidth ephantsi kunye neendleko eziphantsi. , Ngokuqhelekileyo kubasebenzisi beendawo zokuhlala eziphantsi kunye nabaphantsi kwezorhwebo.
c. I-FTTB + ADSL isebenzisa ifayibha ukufikelela kwisakhiwo, emva koko isebenzisa iADSL ukuqhagamshela iinkonzo kubasebenzisi abaninzi, kwaye abasebenzisi abaninzi babelaneI-ONU. I-bandwidth, iindleko kunye nesiseko somthengi ziyafana nezo ze-FTTB + LAN.
4. Ukuthelekisa i-GPON kunye ne-EPON ubuchwepheshe
Ngokujonga iimpawu ezahlukeneyo ze-GPON kunye ne-EPON teknoloji, uhlalutyo olulandelayo lunokwenziwa kwezi teknoloji zimbini.
(I-1) I-GPON ixhasa amanqanaba ahlukeneyo omgangatho, kwaye inokuxhasa i-asymmetric ephezulu kunye ne-downstream rates. I-GPON ine-leeway enkulu ekukhetheni amacandelo optical, ngokunciphisa iindleko.
(I-2) i-EPON ixhasa kuphela amanqanaba e-ODN eKlasi A kunye ne-B, ngelixa i-GPON inokuxhasa i-Class A, B kunye ne-C, ngoko ke i-GPON inokuxhasa ukuya kwi-128 ye-split ratio kunye ne-20km umgama wokudluliselwa.
(3） Thelekisa kuphela kwiprotocol, kuba umgangatho we-EPON usekelwe kwi-802.3 yesakhiwo senkqubo, ngoko xa kuthelekiswa nomgangatho we-GPON, i-protocol layering ilula kwaye ukuphunyezwa kwenkqubo kulula.
(4） I-ITU ilandele iikhonsepthi ezininzi zomgangatho we-APON G.983 kwinkqubo yokuqulunqa umgangatho we-GPON, ophelele ngakumbi kunomgangatho we-EPON oqulunqwe yi-EFM. Ubonelelo lwendlela yomaleko ye-TC esebenza kakhulu iya kuba ngundoqo kwi-ITU ekuqulunqeni imigangatho ye-GPON.
(5) Umgangatho we-GPON umisela ukuba i-sublayer ye-TC inokusebenzisa iindlela ezimbini zokuhlanganisa, i-ATM kunye ne-GFP. Indlela ye-GFP encapsulation ifanelekile ukuthwala i-IP / PPP kunye nezinye iiprotocol ezisekelwe kwipakethi ephezulu.