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 yekuona yakagadziridzwa kutsigira point-to-multipoint application.PON ine Optical Line Terminal (OLT), Optical Network Unit (ONU) uye Optical Distribution Network (ODN). Chinhu chakakosha ndechekuti ODN yese inoumbwa nezvishandiso zvepasi, uye chiratidzo chinoparadzirwa kubva kune imwechete Shared optical fiber kune mumwe nemumwe mushandisi kuburikidza ne splitter.Iyi system inodaidzwa kuti Passive Optical Network nekuti yakasiyana neyechinyakare kubatana pakati pepakati. hofisi uye mutengi, uye sosi yemidziyo yemagetsi iri pakati peiyi network yekuwana.Kuwedzera kune zvakanakira kuchengetedza fiber zviwanikwa, PON inogona kurerutsa zvakanyanya kushanda nekuchengetedza network system, iyo inoshanda zvakanyanya mukuderedza kuvaka nekushandisa mari. , 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-side Optical Network Unit (ONU) uye Optical Distribution Network (ODN).
2.1 OLT
Nguva zhinji, OLT inoiswa mukamuri yepakati yemuchina.Inopa optical fiber excuse ye passive optical network munzira yekudzika, GE, 10baes-t, 100base-t, 10gbase-x uye mamwe mainterface ari kumusoro kumusoro, uye OLT inotsigira EI interface kuti ione TDM izwi rekupinda.
2.2 ONU/ONT
ONU/ONT inoiswa pamagumo emushandisi, kunyanya ichishandisa Ethernet protocol kuona kuendesa kwakajeka kwe data yemushandisi.Data inogona kuendeswa mberi pakati peOLT neONU.
2.3 ODN
Sebazi rinopfuura refiber, ODN inobatanidza zvigadziriso zveOLT neONU.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 dzinowanzoita, 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 che bandwidth haisi yakakwirira, kune rumwe rutivi, kugoverwa kwehuwandu hwemagetsi huchavandudza kushandiswa kwebhanwidth yehurongwa.Kamwe kamwe basa rinodiwa reONU. inogona kuwanikwa neDBA.Dynamic bandwidth kugadziriswa pakati peONU inogona kuvandudza kushanda kwePON upline bandwidth.Nekuda kwekuvandudzwa kwekushandisa bandwidth, vashandisi veW vakawanda vanogona kuwedzerwa paPON iripo, uye bandwidth peak kukosha iyo vashandisi veW vanogona kusvika inogona kuenzaniswa kana kunyange. kudarika bandwidth yetsika yekugovera yunifomu nzira.
Centralized control inzira ye dynamic bandwidth allocation.Iyi nzira ndeye ose ONU uplink meseji, inoshandiswa kuOLT ye bandwidth, ipapo OLT maererano nechikumbiro chemvumo yeONU maererano nealgorithm yakakodzera yebroadband yakaverengerwa kuW. Pfungwa huru yekugovera maitiro algorithm ndeyekuti yega yega ONU lee uplink inogona kupatsanura nguva yekugoverwa kwekusvika kwesero uye kukumbira bandwidth.Maererano nechikumbiro cheONU yega yega, OLT inogovera bandwidth nenzira kwayo uye zvine musoro, uye inobata kugadzirisa kuwandisa, kodhi yekukanganisa ruzivo, sero. kurasikirwa, nezvimwewo.
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 - division multiplexing ine zvimwe zvinokanganisa.Semuyenzaniso, kana imwe yenguva isina kushandiswa, inotora imwe bandwidth, kuitira kuti iyo yakanyanya kuputika kwesevhisi kuchinjika haina kusimba zvakakwana.ONU inoda kuwiriranisa uye dzimwe nzira dzekuwana pasina a imwe nguva yekuwana.Saka, nhamba yenguva yekuparadzanisa kuwanda kwekuwana multiplexing inowanzoshandiswa mushure mekuenzanisa kuperevedza kwezviviri.Kana chiratidzo cheuplink chichiendeswa, Ethernet frame inotumirwa munguva iyo iyo ONU yakagoverwa, uye ukuru hwe. iyo data inopiwa nehuwandu hwehuwandu hunoshandiswa kushandura saizi yenguva.
3.3 Tekinoroji yeOLT yekutangira nekunonoka muripo uye ONU plug-and-play tekinoroji
Nekuda kwekuti chiteshi chekumusoro cheEPON SHANDISA TDMA, kuwana-mapoinzi akawanda kunoita kuti data furemu inonoke yeONU yega yega yakasiyana, saka tekinoroji yekubhadhara uye kunonoka inounzwa kudzivirira kudhumhana kwedata munguva.Kuitira kudzivirira kudhumhana kwenguva. domain data, kuyera kureba uye nguva yekunonoka kubhadhara tekinoroji inofanira kushandiswa kuwiriranisa iyo network network gap yese.Nenzira iyi, mapaketi anosvika pane yakatsanangurwa nguva yakatarwa maererano neiyo DBA algorithm uye inotsigira plug uye tamba yeONU.Kuyera chinhambwe kubva kune imwe neimwe. ONU kuOLT nenzira yakarurama uye kugadzirisa kunonoka kwekufambisa kweONU zvakanyatsonaka kunogona kuderedza nguva pakati pekutumira Windows yeONU, kuvandudza kushandiswa kweuplink channel uye kuderedza kunonoka.Iyo EPON inotangira uye inopedzwa panguva imwechete iyo OLT inopfuura, kumaka nguva imwechete iyo plug uye kutamba kweONU kunoonekwa.
3.4Kutumira uye kugamuchira zviratidzo zvekuputika
Sezvo chiratidzo chekuputika kweONU yega yega inogamuchirwa neOLT, OLT inoda kuona kuwiriranisa kwechikamu kwenguva yenguva uye yozogamuchira data.Izvi zvinoda kushandiswa kwemichina yemaziso inokwanisa kutsigira zviratidzo zvinoputika muONU neOLT.Mazhinji midziyo yemaziso haigoni kusangana. ichi chinodiwa, uye nhamba shoma yeburst mode optical device ine kukurumidza kushanda kweinenge 155M, iyo inenge yakakwirira mumutengo.Saka, kuitira kuti uone kuputika kwemaitiro zvinobudirira, maitiro anokosha anoshandiswa pakuguma kwekugamuchira.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
Iyo ONU inogona 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 yakafanana neFTTH.Iyi nzira yekuwana inowanzoitwa mune corridor switch.
Mhedziso
Tekinoroji yeEPON ine zvakawanda zvakanakira, senge kuvharika kwevashandisi, kumhanya kwepamusoro uye kudzika kwemvura, maitiro ekutapurirana zvakanaka kwemaziso, kuchengetedza zviwanikwa zvefiber kubva padanho kuenda kune-multi-point network uye zvichingodaro. -level oparesheni yakasarudzwa tekinoroji yekuvaka, asi zvakare ine passive, isina electromagnetic mwaranzi simba rekuchengetedza uye kuchengetedzwa kwezvakatipoteredza.Seye optical communication tekinoroji, EPON tekinoroji yakakosha zvikuru.Seimwe yehunyanzvi hwemazuva ese 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.