I-OTN (i-Optical Transport Network) yinethiwekhi yothumelo eququzelela iinethiwekhi kumaleko we-optical ngokusekelwe kwitekhnoloji yokwahlulahlula ubude be-wavelength.

Yinethiwekhi yothutho olusisiseko lwesizukulwana esilandelayo. Ngamafutshane, yinethiwekhi yothutho lwesizukulwana esilandelayo olusekelwe kumaza obude.

I-OTN yinethiwekhi yothutho esekelwe kwitekhnoloji yokwahlulahlula ubude be-wavelength ehlela inethiwekhi kwi-optical layer, kwaye yinethiwekhi yothutho olusisiseko lwesizukulwana esilandelayo. I-OTNsisizukulwana esitsha "senkqubo yokudlulisa yedijithali" kunye "nenkqubo yokudlulisa optical" elawulwa luluhlu lweengcebiso ze-ITU-T ezifana ne-G.872, G.709, kunye ne-G.798. Iya kusombulula ingxaki yokungabikho kweenkonzo ze-wavelength/sub-wavelength kwiinethiwekhi zemveli ze-WDM. Iingxaki ezinje ngokungakwazi ukucwangcisa kakuhle, ukungakwazi ukunxibelelana okubuthathaka, kunye nokungakwazi ukuzikhusela okubuthathaka. I-OTN isombulula uthotho lweengxaki ezininzi zeenkqubo zemveli ngothotho lweeprotocol.
I-OTN ibandakanya i-domain yombane yendabuko (uthumelo lwedijithali) kunye ne-domain ye-optical (uthumelo lwe-analog), kwaye ngumgangatho odibeneyo wokulawula i-domain yombane kunye ne-optical.
Injongo esisiseko Ukucutshungulwa kwe-OTNyishishini elikwinqanaba lobude be-wavelength, elityhala inethiwekhi yothutho ukuya kwinqanaba lenethiwekhi yokwenyani ye-multi-wavelength optical. Ngenxa yokudibanisa iingenelo ze-optical domain kunye ne-electrical domain processing, i-OTN inokubonelela ngomthamo omkhulu wothumelo, uqhagamshelo olucacileyo olupheleleyo lwe-wavelength/sub-wavelength ukusuka ekuqaleni ukuya ekupheleni kunye nokhuseleko lwe-carrier-class, kwaye yeyona teknoloji ifanelekileyo yokudlulisa iinkonzo ze-broadband large-particle.

inzuzo ephambili

Inzuzo ephambili ye-OTN kukuba ihambelana ngokupheleleyo nomva, inokwakhela kwimisebenzi yolawulo lwe-SONET/SDH ekhoyo, ayiboneleli kuphela ngokucaca okupheleleyo kweenkqubo zonxibelelwano ezikhoyo, kodwa ikwabonelela ngonxibelelwano oluvela ekupheleni ukuya ekupheleni kunye nobuchule bokunxibelelana kwi-WDM, Ibonelela ngeenkcukacha zonxibelelwano lwe-optical layer kwi-ROADM, kwaye yongeza amandla okuhlanganisa kunye nokulungisa amanqanaba angaphantsi. Amandla okudibanisa kunye nokunxibelelana asekwe ngokusisiseko kwi-SDH, kwaye imodeli ye-optical layer iyabonelelwa.

Ingcamango ye-OTN igubungela umaleko we-optical kunye nenethiwekhi yomaleko wombane, kwaye itekhnoloji yayo ifumana iingenelo ezimbini ze-SDH kunye ne-WDM. Iimpawu zobugcisa eziphambili zezi zilandelayo:

1. Ukufakwa kwemiqondiso eyahlukeneyo yabathengi kunye nokudluliselwa okucacileyo Ulwakhiwo lwesakhelo se-OTN olusekwe kwi-ITU-TG.709 lunokuxhasa ukumaphu kunye nokudluliselwa okucacileyo kwemiqondiso eyahlukeneyo yabathengi, njenge-SDH, i-ATM, i-Ethernet, njl. Ukufakwa kwesakhelo esiqhelekileyo kunye nokudluliselwa okucacileyo kunokufezekiswa kwi-SDH kunye ne-ATM, kodwa inkxaso ye-Ethernet ngamanani ahlukeneyo yahlukile. I-ITU-TG.sup43 inika iingcebiso ezongezelelweyo kwiinkonzo ze-10GE ukuze kufezekiswe amanqanaba ahlukeneyo okudluliselwa okucacileyo, ngelixa kwi-GE, 40GE, 100GE Ethernet, iinkonzo zenethiwekhi yabucala i-Fibre Channel (FC) kunye neenkonzo zenethiwekhi yokufikelela i-Gigabit Passive Optical Network (GPON) ), njl., indlela emiselweyo yokumaphu kwisakhelo se-OTN okwangoku iyaxoxwa.

2. Ukudibanisa i-bandwidth, i-crossover kunye noqwalaselo lwee-particles ezinkulu Ii-particles ze-bandwidth ze-layer layer ezichazwe yi-OTN ziiyunithi zedatha ye-optical channel (O-DUk, k=0,1,2,3), ezizezi i-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 multiplexing, i-crossover kunye nee-particles ezicwangcisiweyo ngokucacileyo zikhulu kakhulu, nto leyo enokuphucula kakhulu ukuguquguquka kunye nokusebenza kakuhle kokudlulisela iinkonzo zabathengi bedatha ye-bandwidth ephezulu.

3. Amandla okulawula i-overhead kunye nokugcinwa kwe-OTN anamandla okulawula i-overhead afana ne-SDH, kwaye isakhiwo sefreyimu ye-OTN yomaleko we-OTN Optical Channel (OCh) siphucula kakhulu amandla okujonga idijithali ale maleko. Ukongeza, i-OTN ikwabonelela ngomsebenzi wokujonga uqhagamshelo lwe-serial nested (TCM) olunezintlu ezi-6, okwenza kube nokwenzeka ukwenza ukujonga ukusebenza kwe-end-to-end kunye ne-multiple segment ngexesha elinye ngexesha lothungelwano lwe-OTN. Ibonelela ngeendlela ezifanelekileyo zolawulo zokudlulisela i-cross-operators.

4. Uphuhliso lwezakhono zothungelwano kunye nokukhusela Ngokusebenzisa ulwakhiwo lwesakhelo se-OTN, i-ODUk crossover kunye ne-multi-dimensional reconfigurable optical add-drop multiplexer (ROADM), amandla othungelwano lwenethiwekhi yothutho lwe-optical aphuculwe kakhulu, kwaye i-bandwidth yokuhlela ye-12/VC-4 esekelwe kwi-SDHVC kunye nemeko ye-WDM point-to-point ebonelela nge-bandwidth yothungelwano olukhulu. Ukwamkelwa kwetekhnoloji yokulungisa iimpazamo phambili (FEC) kwandisa kakhulu umgama wothungelwano lwe-optical layer. Ukongeza, i-OTN iya kubonelela ngemisebenzi yokhuseleko lwenkonzo eguquguqukayo ngakumbi ngokusekelwe kumaleko ombane kunye nomaleko obonakalayo, njengokhuseleko lonxibelelwano lwenethiwekhi ye-photonic olusekwe kumaleko e-ODUk (SNCP) kunye nokhuseleko lwenethiwekhi yeringi ekwabelwana ngayo, itshaneli ye-optical esekelwe kumaleko obonakalayo okanye ukhuseleko lwecandelo le-multiplex, njl. Kodwa itekhnoloji yeringi ekwabelwana ngayo ayikamiselwanga mgangatho.