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 i-ONU ifumana idatha, ifumana kuphela izakhelo okanye izakhelo zosasazo ezihambelana ne-LLID yayo.
(4) Umgaqo we-EPON-Uplink
a.Thelekisa uluhlu lobhaliso lwe-LLID phambi kokuba i-OLT ifumane idatha.
b.I-ONU nganye ithumela isakhelo sedatha kwixesha le-slot elabiwe ngokufanayo zizixhobo zeofisi.
c.Ixesha elibekiweyo elibekiweyo libuyekeza isithuba somgama phakathi kwee-ONU kwaye sinqanda ukungqubana phakathi kwee-ONU.
(5) Inkqubo yokusebenza kwenkqubo ye-EPON
Ukusebenza kweOLT
a.Yenza imiyalezo yesitampu sexesha ngexesha lereferensi yexesha.
b.Yabela i-bandwidth ngokusebenzisa izakhelo zeMPCP.3. Yenza imisebenzi eyahlukahlukeneyo.
c.Lawula ubhaliso lwe-ONU.
Ukusebenza kwe-ONU
a.I ONU ingqamanisa ne OLT ngokusebenzisa isitampu sexesha sesakhelo solawulo ezantsi.
b.I-ONU ilinda isakhelo sokufunyanwa.
c.I-ONU yenza inkqubo yokufumanisa, kubandakanywa: ukusuka, ukucacisa i-ID yomzimba kunye ne-bandwidth.
d.I-ONU ilindele ukugunyaziswa, i-ONU inokuthumela kuphela idatha ngexesha eligunyazisiweyo.
(6) Uyilo lwenkqubo yolawulo lwenethiwekhi ye-EPON
Inkqubo yolawulo lwenethiwekhi ye-EPON ihlukaniswe kwiimodyuli ezine ngokwemisebenzi yolawulo lwenethiwekhi: ulawulo lokucwangciswa, ulawulo lwentsebenzo, 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
Usasazo lwe-GPON ezantsi-kusasaza
Imowudi ye-GPONS enyukayo-TDMA
I-topology yenethiwekhi ye-passive optical fiber transmission mode iqulunqwe kakhulu yi-OLT (i-terminal ye-optical line), i-ODN (inethiwekhi yokusabalalisa i-optical), kunye ne-ONU (iyunithi yenethiwekhi ye-optical network).
I-ODN ibonelela ngeendlela zokuhanjiswa kwe-optical kwi-OLT kunye ne-ONU.Iqulathe i-passive optical splitter kunye ne-passive optical combineer.Sisixhobo sokwenziwa esidibanisa i-OLT kunye ne-ONU.
(3) GPON umgaqo-phezulu
a.Ukuhanjiswa kwedatha enyukayo kulawulwa ngokufanayo yiOLT.
b.I-ONU idlulisela idatha yomsebenzisi ngokwexesha elibekwe yi-OLT ukuphepha iingxabano zokuhanjiswa kwedatha eziveliswa yi-ONU.
c.I-ONU ifaka idatha ye-uplink kwi-slot yayo yexesha ngokuhambelana nesakhelo solwabiwo lwe-slot, ukuqonda ukwabelana nge-bandwidth yesiteshi se-uplink phakathi kwee-ONU ezininzi.
(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 ingene kwi-splitter, ixhunywe ngokuthe ngqo kumsebenzisi we-ONU.I-ONU isetyenziswe kuphela ngumsebenzisi omnye, kunye ne-bandwidth ephezulu kunye neendleko eziphezulu, kwaye ngokuqhelekileyo ijolise kubasebenzisi abaphezulu kunye nabasebenzisi bezorhwebo.
b.I-FTTB + LAN isebenzisa i-fiber ukufikelela kwisakhiwo, kwaye idibanisa iinkonzo ezahlukeneyo kubasebenzisi abaninzi ngokusebenzisa i-ONU enkulu (ebizwa ngokuba yi-MDU).Ke ngoko, abasebenzisi abaninzi babelana ngemithombo ye-bandwidth ye-ONU enye, 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, kwaye isebenzisa i-ADSL ukudibanisa iinkonzo kubasebenzisi abaninzi, kwaye abasebenzisi abaninzi babelana nge-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.