I-OTN (i-Optical Transport Network) yinethiwekhi yothumelo eququzelela uthungelwano kwi-optical layer ngokusekelwe kwi-wavelength division multiplexing technology.

Ingumqolo wothungelwano lothungelwano lwesizukulwana esilandelayo.Ukubeka ngokulula, luthungelwano lwezothutho olusekwe kwisizukulwana esilandelayo.

I-OTN yinethiwekhi yezothutho esekwe kwi-wavelength division multiplexing technology eququzelela uthungelwano kwi-optical layer, kwaye yi-backbone transport network yesizukulwana esilandelayo. OTNsisizukulwana esitsha "senkqubo yokuhanjiswa kwedijithali" kunye "nenkqubo yokuhanjiswa kwe-optical" elawulwa luluhlu lweengcebiso ze-ITU-T ezifana ne-G.872, G.709, kunye ne-G.798.Iya kusombulula ingxaki yokungabikho kwe-wavelength / sub-wavelength iinkonzo kwiinethiwekhi ze-WDM zendabuko.Iingxaki ezifana nokungabinakho ukucwangciswa kakuhle, amandla othungelwano olubuthathaka, kunye nekhono lokukhusela elibuthathaka.I-OTN isombulula uthotho lweengxaki ezininzi zeenkqubo zemveli ngothotho lwemigaqo.
I-OTN idibanisa i-domain yemveli yombane (ukudluliselwa kwedijithali) kunye ne-optical domain (i-analog transmission), kwaye ngumgangatho odibeneyo wokulawula imimandla yombane kunye ne-optical.
Into esisiseko ye Uqhubekeko lwe-OTNlishishini lenqanaba lamaza, elityhalela uthungelwano lwezothutho ukuya kwinqanaba lenyani yothungelwano lwamaza amaza amaninzi.Ngenxa yokudityaniswa kwezinto ezilungileyo zesizinda sombane kunye nokusetyenzwa kwesizinda sombane, i-OTN inokubonelela ngomthamo omkhulu wothumelo, uqhagamshelo olucacileyo lokuya ekupheleni kwewavelength/sub-wavelength kunye nokhuseleko lodidi lomthwali, kwaye bubuchwephesha obugqwesileyo bokuhambisa ibroadband enkulu. -iinkonzo zamasuntswana.

inzuzo ephambili

Inzuzo ephambili ye-OTN kukuba ihambelana ngokupheleleyo ngasemva, inokwakha kwimisebenzi yolawulo ekhoyo ye-SONET / SDH, ayinikezeli nje kuphela ukucaca okupheleleyo kweeprothokholi zonxibelelwano ezikhoyo, kodwa ibonelela ngoqhagamshelwano olupheleleyo kunye nezakhono zokunxibelelana kwi-WDM. , Inika inkcazo ye-optical layer interconnection ye-ROADM, kwaye yongeza i-sub-wavelength aggregation kunye nobuchule bokuzilungisa.Ikhonkco ekupheleni kokuphela kunye nezakhono zokunxibelelana zisekwe ikakhulu kwisiseko se-SDH, kwaye imodeli ye-optical layer inikezelwa.

Ingcamango ye-OTN ihlanganisa i-optical layer kunye ne-network layer network, kwaye iteknoloji yayo izuza izibonelelo ezimbini ze-SDH kunye ne-WDM.Iimpawu eziphambili zobugcisa zezi zilandelayo:

1. Iintlobo ezahlukeneyo ze-encapsulation ye-client ye-encapsulation kunye nokuhanjiswa okucacileyo Isakhiwo se-OTN yesakhelo esisekelwe kwi-ITU-TG.709 sinokuxhasa imephu kunye nokuhanjiswa okucacileyo kweempawu ezahlukeneyo zabathengi, njenge-SDH, i-ATM, i-Ethernet, njl njl. ye-SDH kunye ne-ATM, kodwa inkxaso ye-Ethernet kumazinga ahlukeneyo ahlukile.I-ITU-TG.sup43 inikezela ngeengcebiso ezongezelelweyo kwiinkonzo ze-10GE ukufezekisa amanqanaba ahlukeneyo okudluliselwa okucacileyo, ngelixa i-GE, i-40GE, i-100GE Ethernet, iinkonzo zenethiwekhi yangasese yeFiber Channel (FC) kunye nokufikelela kwiinkonzo zenethiwekhi yeGigabit Passive Optical Network (GPON) ), njl. ., indlela esemgangathweni yokwenza imephu kwisakhelo seOTN iphantsi kwengxoxo.

2. I-Bandwidth multiplexing, i-crossover kunye nokucwangciswa kweenqununu ezinkulu Iinqununu ze-bandwidth layer yombane ezichazwe yi-OTN ziiyunithi zedatha ye-optical channel (O-DUk, k = 0,1,2,3), okuyi-ODUO (GE,1000M / S) ODU1 (2.5Gb / s), i-ODU2 (10Gb / s) kunye ne-ODU3 (40Gb / s), i-bandwidth granularity ye-optical layer yi-wavelength, xa kuthelekiswa ne-schedule granularity ye-SDH VC-12 / VC-4, i-OTN i-multiplexing, i-crossover kwaye Iinqununu ezicwangcisiweyo ngokucacileyo zikhulu kakhulu, ezinokuphucula kakhulu ukulungelelaniswa kunye nokusebenza kakuhle kokuhanjiswa kweenkonzo zabathengi bedatha ephezulu.

3. I-overhead enamandla kunye namandla okulawula ukugcinwa kwe-OTN inikezela ngezakhono zolawulo oluphezulu olufana ne-SDH, kunye nesakhiwo sesakhelo se-OTN soluhlu lwe-OTN Optical Channel (OCh) siphucula kakhulu ubuchule bokubeka iliso kwidijithali kolu luhlu.Ukongeza, i-OTN ikwabonelela nge-6-layer nested serial monitoring monitoring (TCM) function, eyenza kube lula ukwenza umsebenzi wokuphela-to-ekupheleni kunye namacandelo amaninzi ngexesha elinye ngexesha lothungelwano lwe-OTN.Ibonelela ngeendlela zolawulo ezifanelekileyo zothumelo lwe-cross-operator.

4. Ukuphuculwa kwenethiwekhi kunye namandla okukhusela Ngokusungulwa kwesakhiwo se-OTN yesakhelo, i-ODUk crossover kunye ne-multi-dimensional reconfigurable optical add-drop multiplexer (ROADM), ikhono lokunxibelelana kwenethiwekhi yothutho lwe-optical liye laphuculwa kakhulu, kwaye i-SDHVC-based 12 / I-VC-4 yokucwangcisa i-bandwidth kunye nemeko ye-WDM point-to-point ibonelela nge-bandwidth yomthamo omkhulu.Ukwamkelwa kwetekhnoloji yokulungiswa kwempazamo yangaphambili (i-FEC) kwandisa kakhulu umgama wokuhanjiswa kwe-optical layer.Ukongeza, i-OTN iya kubonelela ngemisebenzi yokukhusela yenkonzo eguquguqukayo esekelwe kumbane kunye nomgangatho wokukhanya, njenge-ODUk-based layer-based photonic network protection (SNCP) kunye nokukhusela inethiwekhi ye-ring ring, i-optical layer-based optical channel okanye ukhuseleko lwecandelo le-multiplex, njl. Kodwa itekhnoloji yeringi ekwabelwana ngayo ayikabekwa emgangathweni.