Senzira yekukurukurirana inoshanda inowanzoshandiswa. EPON inoshandiswa nevashandisi kuti vabatanidze kune network yekuwana.Mubepa rino, tekinoroji yakakosha yeEPON inotsanangurwa muchidimbu, uye kushandiswa kweEPON mukukurukurirana kwemaziso kunounzwa zvakadzama, uye nheyo yayo yehunyanzvi inoongororwa.
1.TheiNhanganyayaye EPON
PON chibvumirano chePassive Optical Network, inova tekinoroji yekuona yakagadziridzwa kutsigira point-to-multipoint application.PON ine Optical Line Terminal (OLT), Optical Network Unit (ONU) uye Optical Distribution Network (ODN) .Chinhu chayo chakakosha ndechekuti ODN yese inoumbwa nepassive devices, uye chiratidzo chinoparadzirwa kubva kune imwechete Shared optical fiber kune mumwe nemumwe mushandisi kuburikidza nekupatsanurwa.Iyi system inonzi Passive Optical Network nekuti zvakasiyana nehukama hwechinyakare pakati pehofisi yepakati uye mutengi, uye sosi yemidziyo yemagetsi iri pakati peiyi network yekuwana.Kuwedzera kune zvakanakira kuchengetedza fiber zviwanikwa, PON inogona kurerutsa zvakanyanya kushanda nekuchengetedza network network, inova. inoshanda zvikuru mukuderedza mari yekuvaka nekushanda. Uyezve, chimiro che pure optical media uye transparent optical fiber Broadband network inovimbisa kuchengetedzwa kwehunyanzvi kwekuwedzera kwebhizinesi remangwana.
Tekinoroji yeEPON inosanganisa tekinoroji yeEthernet nePON tekinoroji kuona point-to-multipoint high-speed Ethernet fiber access nenzira iri nyore.Point-to-multipoint topology ndiyo nzira yezvimiro inotorwa neEPON, ukuwo nzira yekutepfenyura ichishandiswa kudownlink. uye TDMA modhi inoshandiswa kune upline, iyo inogona kuona nzira mbiri dzekufambisa data.
2.Kuumbwa kweEPON
Senge point-to-multipoint fiber yekuwana tekinoroji, Passive Optical Network (PON) ine yemuno Optical Line Terminal (OLT), mushandisi-rutivi Optical Network Unit (ONU) uye Optical Distribution Network (ODN).
2.1OLT
Nguva zhinji,OLTinoiswa muimba yepakati yemuchina. Inopa optical fiber chikonzero chepassive optical network munzira yakadzika pasi, GE, 10baes-t, 100base-t, 10gbase-x uye mamwe mainterface ari kumusoro kumusoro, uyeOLTinotsigira EI interface kuona TDM izwi rekupinda.
2.2ONU/ONT
ONU/ONT inoiswa mumagumo emushandisi, kunyanya ichishandisa Ethernet protocol kuona kuendesa kwakajeka kwe data yemushandisi. Data inogona kutumirwa pakatiOLTuyeONU.
2.3 ODN
Sebazi rinopfuura refiber, ODN inobatanidza passive midziyo yeOLTuyeONU. Basa guru reODN nderekuparadzira data yedownlink uye centralize uplink data.Nekuda kwekuti ibasa rekuita, passive splitter deployment inoshanduka zvikuru uye yakakodzera kune dzakawanda zvakatipoteredza.Mupfungwa dzinozivikanwa, POS imwe neimwe ine chiyero chekuparadzanisa che8, 16, 32 kana 64, uye inogona kubatanidzwa pamatanho akawanda.
3.INhanganyayaof key technologiesof EPON
3.1Dbasfor dynamicbandwidthamugove
Real-time (ms/us magnitude) inoshandura uplinking bandwidth mechanism yeOUN yega yega paEPON, inozivikanwa se dynamic bandwidth allocation algorithm.MuEPON, kana bandwidth yakagoverwa statically, ipapo basa rekufambisa kwekufambisa kwemashoko harina kufanira zvikuru. bandwidth inogoverwa statically pahupamhi hwepamusoro, iyo yose system bandwidth ichave yakaneta munguva pfupi.W chiyero chebhanhire haisi yakakwirira, kune rumwe rutivi, kugoverwa kwemagetsi kunovandudza kushandiswa kwehuwandu hwehurongwa.ONUinogona kuwanikwa neDBA. Dynamic bandwidth kugadzirisa pakatiONUNekuda kwekuvandudzwa kwekushandisa bandwidth, vashandisi vakawanda veW vanogona kuwedzerwa paPON iripo, uye iyo bandwidth peak kukosha iyo W vashandisi vanogona kusvika inogona kuenzaniswa kana kutopfuura bandwidth ye. tsika yekugovera yunifomu nzira.
Centralized control inzira ye dynamic bandwidth allocation.Iyi nzira ndeyevoseONUuplink mameseji, anoiswa kuneOLTye bandwidth, ipapoOLTmaererano nechikumbiro chaJehovhaONUmvumo inoenderana neakakodzera algorithm yebroadband yakaverengerwa W. Pfungwa yekutanga yekugovera maitiro algorithm ndeyekuti yega yega ONU lee uplink inogona kupatsanura nguva yekugoverwa kwekusvika kwesero uye kukumbira bandwidth.Maererano nechikumbiro cheumwe neumwe.ONU, OLTinogovera bandwidth zvakaringana uye zvine musoro, uye inobata kugadzirisa kuwandisa, ruzivo rwekukanganisa kodhi, kurasikirwa kwesero, nezvimwe.
3.2Shandisa zvakare tekinoroji yeuplink chiteshi
Parizvino, iyo huru yekushandiswa inguva yekuparadzanisa kuwanda kwekuwana multiplexing (TDMA), iyo inogona kushandiswa panguva imwechete slot nguva division multiplexing, statistical time division multiple access multiplexing, random access and so on.Zvisinei, M - nguva - slot time Semuyenzaniso, kana imwe nguva isingashandiswe, inotora imwe bandwidth, kuitira kuti iyo yakanyanya kuputika kwesevhisi kuchinjika haina kusimba zvakakwana.ONUinoda kuwiriranisa uye dzimwe nzira dzekuwana dzisina kurongeka pasina imwe nguva yekuwana. Naizvozvo, nhamba yenguva yekukamura kuwanda kwekuwana multiplexing inowanzoshandiswa mushure mekuenzanisa kuperevedza kwezviviri. Kana iyo uplink chiratidzo ichitumirwa, Ethernet frame inotumirwa munguva iyo theONUyakagoverwa, uye saizi yedata yakapihwa nenhamba yehuwandu hunoshandiswa kushandura saizi yenguva slot.
3.3 OLT's kubva uye kunonoka muripo tekinoroji uyeONUplug-uye-kutamba tekinoroji
Nekuti iyo chiteshi chekumusoro cheEPON INOSHANDISA TDMA, akawanda-mapoinzi kuwana anoita kuti data furemu inonoke yeimwe neimweONUzvakasiyana, saka tekinoroji yekubhadhara uye kunonoka inotangwa kudzivirira kudhumhana kwedata munguva domain.Kuitira kudzivirira kudhumhana kwenguva domain data, kuyerwa kwechinhambwe uye nguva yekunonoka muripo tekinoroji inofanira kushandiswa kuwiriranisa iyo yese network nguva gap. Nenzira iyi, mapaketi anosvika pane yakatsanangurwa nguva slot zvinoenderana neiyo DBA algorithm uye inotsigira plug uye tamba yeONU.Kuyera chinhambwe kubva pane chimwe nechimweONUto OLTnemazvo uye kugadzirisa kunonoka kutapurirana kweONUchaizvo inogona kuderedza nguva pakati pekutumira Windows yeONU, kunatsiridza kushandiswa kweuplink channel uye kuderedza kunonoka.Iyo EPON inotangira uye inopedzwa panguva imwe chete iyoOLTinopfuura, ichimaka nguva imwechete iyo plug uye kutamba kweONUyaonekwa.
3.4Kutumira uye kugamuchira zviratidzo zvekuputika
Kubva pakaputika chiratidzo cheumwe neumweONUinogamuchirwa naOLT, OLTinoda kuona kuwiriranisa kwechikamu kwenguva yenguva uye wozogamuchira data.Izvi zvinoda kushandiswa kwemichina yekuona inokwanisa kutsigira zviratidzo zvinoputika mukati.ONUuyeOLT.Most optical devices haigone kusangana nezvinodiwa izvi, uye nhamba shoma yeburst mode optical device ine kukurumidza kushanda kweinenge 155M, iyo inodhura zvakanyanya mumutengo.Naizvozvo, kuitira kuti uone kuputika mode zvakanyanya, maitiro anokosha anoshandiswa kugamuchira kupera. The optical burst transmission circuit inoda kukwanisa kuvhara uye kuzarura nekukurumidza uye kuisa zviratidzo nokukurumidza.Saka, iyo yemazuva ano electro-optical conversion module inoshandisa automatic power control ine mhinduro haichakodzeri kushandiswa, asi inoda lasers nekukurumidza mhinduro.The kugamuchira kuguma kunogamuchira chiratidzo chechiedza simba remushandisi wega wega rakasiyana uye rakatonyanya kushanduka. Naizvozvo, muchikamu chinoputika chekugamuchira, iyo yekugamuchira nhanho (chikumbaridzo) inoda kugadziridzwa nguva dzese kana chiratidzo chitsva chinogamuchirwa.
4.Kushandiswa kwefiber optic communication muchitokisi
TheONUinogona kuiswa padivi revatengi (FTTH) kana pamukoto (FTTB), asi izvi zviri munyaya yekuwana maseru.Mu FTTH mode, nhamba yevashandisi haina chokwadi. Muchiitiko ichi, kuitira kuti uvandudze chiyero chekushandiswa kwemidziyo, kuderedza mari uye kufambisa kugadzirisa.Kugadzika kwe optical divider kunenge kwakanyanyisa, uye kushandiswa kwechiyero chekugovera chiedza, kuiswa kwenzvimbo yezvinhu zvakawanda mukombiyuta. kamuri yenharaunda kana nharaunda mukati mechiedza chekupa bhokisi. Mushure mekuvaka nenzira yakadai, zvisinei kuti nhamba yevashandisi inowedzera kana kuderera, kushandiswa kwemidziyo kunogona kukwidziridzwa. Zvisinei, kana nhamba yevashandisi yakakura, kudiwa kwekuwana fiber optical kuchawedzerawo zvakawanda.Panguva yeFTTB mode, OMU inogadziriswa mukoridhi, uye optical splitter inogadziriswa nenzira imwecheteyo seFTTH. Iyi nzira yekuwana inowanzoitwa mukoridhochinja.
Mhedziso
Tekinoroji yeEPON ine zvakawanda zvakanakira, senge kuvharika kwevashandisi, kumhanya kukuru kwekumusoro uye kudzika kwemvura, hunyanzvi hwekutapurirana maziso, kuchengetedza zviwanikwa zvefiber kubva padanho kuenda kune-multi-point network uye zvichingodaro. -level oparesheni yakasarudzwa tekinoroji yekuvaka, asi zvakare ine passive, isina electromagnetic nemwaranzi simba rekuchengetedza uye kuchengetedzwa kwezvakatipoteredza.Seye optical communication tekinoroji, EPON tekinoroji yakakosha zvikuru.Seimwe yetekinoroji huru mune ramangwana, EPON tekinoroji ine maitiro. yekuchinjika kwakasimba kune nharaunda yekutumirwa, kuvimbika kwepamusoro uye kuchengetedza-isina, kuve sarudzo yakanakisa yekuvakwa kwechizvarwa chinotevera Broadband access network.