I-OTN (i-Optical Transport Network) iyinethiwekhi yokudlulisa ehlela amanethiwekhi kungqimba lwe-optical ngokusekelwe kubuchwepheshe be-multiplexing division wavelength.

Kuyinethiwekhi yokudlulisa umgogodla wesizukulwane esilandelayo. Kalula nje, iyinethiwekhi yokuthutha yesizukulwane esilandelayo esekelwe kubude besikhathi.

I-OTN iyinethiwekhi yezokuthutha esekelwe kubuchwepheshe bokuhlukaniswa kwamaza obubanzi obuhlela inethiwekhi kungqimba olubonakalayo, futhi iyinethiwekhi yokuthutha eyinhloko yesizukulwane esilandelayo. I-OTNiyisizukulwane esisha "sesistimu yokudlulisa yedijithali" kanye "nesistimu yokudlulisa ye-optical" elawulwa uchungechunge lwezincomo ze-ITU-T ezifana ne-G.872, G.709, kanye ne-G.798. Izoxazulula inkinga yokungabi nezinsizakalo ze-wavelength/sub-wavelength kumanethiwekhi endabuko e-WDM. Izinkinga ezifana nokukwazi ukuhlela okubi, ikhono lokuxhumana elibuthakathaka, kanye nekhono lokuvikela elibuthakathaka. I-OTN ixazulula uchungechunge lwezinkinga eziningana zezinhlelo zendabuko ngochungechunge lwezinqubo.
I-OTN ihlanganisa isizinda sikagesi sendabuko (ukudluliselwa kwedijithali) kanye nesizinda se-optical (ukudluliselwa kwe-analog), futhi iyindinganiso ehlanganisiwe yokuphatha izizinda zikagesi neze-optical.
Inhloso eyisisekelo yalokhu Ukucutshungulwa kwe-OTNibhizinisi elisezingeni lamaza, eliqhubekisela phambili inethiwekhi yezokuthutha iye esigabeni senethiwekhi yangempela ye-optical enamaza amaningi. Ngenxa yokuhlanganiswa kwezinzuzo zesizinda se-optical kanye nokucutshungulwa kwesizinda sikagesi, i-OTN inganikeza umthamo omkhulu wokudlulisa, ukuxhumana okusobala ngokuphelele kwe-wavelength/sub-wavelength kusukela ekuqaleni kuya ekugcineni kanye nokuvikelwa kwesigaba sokuthwala, futhi ubuchwepheshe obuhle kakhulu bokudlulisa izinsizakalo ze-broadband ezinkulu.

inzuzo eyinhloko

Inzuzo enkulu ye-OTN ukuthi ihambisana ngokuphelele emuva, ingakhela emisebenzini yokuphatha ye-SONET/SDH ekhona, ayinikezi nje kuphela ukucaca okuphelele kwezinqubo zokuxhumana ezikhona, kodwa futhi ihlinzeka ngokuxhumana kusukela ekuqaleni kuze kube sekupheleni kanye namakhono okuxhumana e-WDM, Ihlinzeka ngemininingwane yokuxhumana kwezingqimba ze-optical ze-ROADM, futhi inezela amandla okuhlanganisa nokulungisa amagagasi angaphansi. Amandla okuxhumana kusukela ekuqaleni kuze kube sekupheleni kanye namakhono okuxhumana asungulwa kakhulu ngesisekelo se-SDH, futhi kunikezwe imodeli yesendlalelo se-optical.

Umqondo we-OTN uhlanganisa ungqimba olubonakalayo kanye nenethiwekhi yongqimba kagesi, futhi ubuchwepheshe bawo buzuza izinzuzo ezimbili ze-SDH kanye ne-WDM. Izici zobuchwepheshe ezibalulekile yilezi ezilandelayo:

1. Ukuvalelwa kwesignali yeklayenti ehlukahlukene kanye nokudluliswa okusobala Isakhiwo sohlaka lwe-OTN esisekelwe ku-ITU-TG.709 singasekela ukumepha kanye nokudluliswa okusobala kwezibonakaliso zeklayenti ezahlukahlukene, njenge-SDH, i-ATM, i-Ethernet, njll. Ukuvalelwa okujwayelekile kanye nokudluliswa okusobala kungatholakala ku-SDH kanye ne-ATM, kodwa ukusekelwa kwe-Ethernet ngamanani ahlukene kuhlukile. I-ITU-TG.sup43 inikeza izincomo ezengeziwe zezinsizakalo ze-10GE ukuze kufezwe amazinga ahlukene okuvalelwa okusobala, kuyilapho ku-GE, 40GE, 100GE Ethernet, izinsizakalo zenethiwekhi ezizimele ze-Fibre Channel (FC) kanye nezinsizakalo zenethiwekhi yokufinyelela i-Gigabit Passive Optical Network (GPON) ), njll., indlela ejwayelekile yokumapha eya kuhlaka lwe-OTN okwamanje isaxoxwa.

2. Ukwelulwa kwe-bandwidth, ukugoqa kanye nokucushwa kwezinhlayiya ezinkulu Izinhlayiya ze-bandwidth zesendlalelo sikagesi ezichazwe yi-OTN ziyiyunithi yedatha yesiteshi se-optical (O-DUk, k=0,1,2,3), okuyi-ODUO(GE,1000M/S)ODU1 (2.5Gb/s), i-ODU2 (10Gb/s) kanye ne-ODU3 (40Gb/s), ubuningi be-bandwidth besendlalelo se-optical buyi-wavelength, uma kuqhathaniswa nobuningi beshejuli ye-SDH VC-12/VC-4, i-OTN multiplexing, i-crossover kanye nezinhlayiya ezilungiselelwe ngokusobala zinkulu kakhulu, okungathuthukisa kakhulu ukuzivumelanisa nezimo kanye nokusebenza kahle kokudlulisela kwezinsizakalo zamakhasimende zedatha ye-bandwidth ephezulu.

3. Amakhono okuphatha okungaphezulu kanye nokugcinwa kwe-OTN anamandla ahlinzeka ngamakhono okuphatha okungaphezulu afana ne-SDH, futhi isakhiwo sohlaka lwe-OTN sesendlalelo se-OTN Optical Channel (OCh) sithuthukisa kakhulu amakhono okuqapha edijithali alesi sendlalelo. Ngaphezu kwalokho, i-OTN iphinde inikeze umsebenzi wokuqapha uxhumano lwe-serial olunezingqimba ezi-6 (i-TCM), okwenza kube nokwenzeka ukwenza ukuqapha ukusebenza kwezingxenye eziningi kusukela ekuqaleni kuya ekugcineni ngesikhathi esifanayo ngesikhathi senethiwekhi ye-OTN. Ihlinzeka ngezindlela zokuphatha ezifanele zokudlulisela opharetha abahlukene.

4. Amakhono okuxhumana athuthukisiwe kanye nokuvikelwa Ngokusebenzisa isakhiwo sohlaka lwe-OTN, i-ODUk crossover kanye ne-multi-dimensional reconfigurable optical add-drop multiplexer (ROADM), amandla okuxhumana enethiwekhi yokuthutha ye-optical athuthukisiwe kakhulu, kanye ne-bandwidth yokuhlela ye-12/VC-4 esekelwe ku-SDHVC kanye nesimo samanje se-WDM point-to-point enikeza i-bandwidth yokudlulisa enamandla amakhulu. Ukwamukelwa kobuchwepheshe bokulungisa amaphutha phambili (FEC) kwandisa kakhulu ibanga lokudluliselwa kwengqimba ye-optical. Ngaphezu kwalokho, i-OTN izohlinzeka ngemisebenzi yokuvikela isevisi eguquguqukayo ngokusekelwe kungqimba kagesi kanye nengqimba ye-optical, njengokuvikelwa kokuxhumeka kwenethiwekhi ye-photonic esekelwe kungqimba ye-ODUk (SNCP) kanye nokuvikelwa kwenethiwekhi yendandatho eyabiwe, isiteshi se-optical esekelwe kungqimba ye-optical noma ukuvikelwa kwesigaba se-multiplex, njll. Kodwa ubuchwepheshe bendandatho eyabiwe abukakahlelwa.