I-OTN (Optical Transport Network) iyinethiwekhi yokudlulisa ehlela amanethiwekhi kungqimba yokubona ngokusekelwe kubuchwepheshe bokuphindaphinda kwe-wavelength division.

Iwumgogodla wenethiwekhi yesizukulwane esilandelayo.Kalula nje, iyinethiwekhi yezokuthutha yesizukulwane esilandelayo esekwe yiwavelength.

I-OTN inethiwekhi yezokuthutha esekelwe kubuchwepheshe be-wavelength division multiplexing ehlela inethiwekhi endaweni yokukhanya, futhi iyinethiwekhi yokuthutha engumgogodla yesizukulwane esilandelayo. I-OTNiyisizukulwane esisha "sesistimu yokudlulisa idijithali" kanye "nesistimu yokudlulisa amehlo" elawulwa uchungechunge lwezincomo ze-ITU-T ezifana ne-G.872, G.709, ne-G.798.Izoxazulula inkinga yokungabikho kwezinsizakalo ze-wavelength/sub-wavelength kumanethiwekhi endabuko e-WDM.Izinkinga ezifana nekhono lokushejula elingalungile, amandla okuxhumana abuthakathaka, namandla okuvikela abuthakathaka.I-OTN ixazulula uchungechunge lwezinkinga ezimbalwa zezinhlelo zendabuko ngochungechunge lwamaphrothokholi.
I-OTN ihlanganisa isizinda sikagesi esivamile (ukudluliselwa kwedijithali) kanye nesizinda sokubona (ukudluliselwa kwe-analogi), futhi iyindinganiso ehlanganisiwe yokuphatha izizinda zikagesi nezibonayo.
Into eyisisekelo ye Ukucubungula kwe-OTNibhizinisi lezinga le-wavelength, eliphusha inethiwekhi yezokuthutha iye esigabeni senethiwekhi yeqiniso yamaza amaza amaningi.Ngenxa yenhlanganisela yezinzuzo zesizinda sokubona nokucutshungulwa kwesizinda sikagesi, i-OTN inganikeza umthamo omkhulu wokudlulisa, ukuxhumana okusobala ngokuphelele kwe-wavelength/sub-wavelength kanye nokuvikelwa kwesigaba senkampani yenethiwekhi, futhi iwubuchwepheshe obufanele bokudlulisa i-broadband enkulu. -izinkonzo zezinhlayiya.

inzuzo enkulu

Inzuzo enkulu ye-OTN ukuthi ihambisana ngokugcwele emuva, ingakha emisebenzini ekhona yokuphatha ye-SONET/SDH, ayinikezi nje kuphela ukucaca okuphelele kwezivumelwano zokuxhumana ezikhona, kodwa futhi inikeza ukuxhumana kokuphela nokuphela kanye namakhono okuxhumana e-WDM. , Inikeza ukucaciswa kokuxhumeka kongqimba lwe-optical lwe-ROADM, futhi yengeza ukuhlanganisa kwe-sub-wavelength namandla okuzilungisa.Isixhumanisi sokuphela-kuya-ekupheleni kanye namakhono okuxhumana asungulwa ngokuyinhloko ngesisekelo se-SDH, futhi imodeli ye-optical layer inikezwa.

Umqondo we-OTN uhlanganisa isendlalelo se-optical kanye nenethiwekhi yesendlalelo sikagesi, futhi ubuchwepheshe bayo buzuza njengefa izinzuzo ezimbili ze-SDH ne-WDM.Izici ezibalulekile zobuchwepheshe zimi kanje:

1. I-encapsulation yesignali yeklayenti ehlukahlukene kanye nokudlulisa okusobala Isakhiwo sohlaka lwe-OTN esisekelwe ku-ITU-TG.709 singasekela ukumepha nokudluliswa okusobala kwamasiginali ahlukahlukene wamaklayenti, njenge-SDH, i-ATM, i-Ethernet, njll. Ukuhlanganisa okujwayelekile nokudluliswa okusobala kungafinyelelwa ye-SDH ne-ATM, kodwa ukusekelwa kwe-Ethernet ngamanani ahlukene kuhlukile.I-ITU-TG.sup43 inikeza izincomo ezengeziwe zezinsizakalo ze-10GE ukuze kuzuzwe amazinga ahlukene okudlulisela okusobala, kuyilapho i-GE, 40GE, 100GE Ethernet, izinsizakalo zenethiwekhi yangasese i-Fiber Channel (FC) kanye nokufinyelela izinsizakalo zenethiwekhi i-Gigabit Passive Optical Network (GPON) ), njll. ., indlela emisiwe yokwenza imephu kuhlaka lwe-OTN isaxoxwa okwamanje.

2. Ukuphindaphindeka komkhawulokudonsa, ukuphambana kanye nokucushwa kwezinhlayiya ezinkulu Izinhlayiya zomkhawulokudonsa wengqimba kagesi ezichazwe yi-OTN zingamayunithi edatha wesiteshi optical (O-DUk, k=0,1,2,3), okuyi-ODUO(GE,1000M/S)ODU1 (2.5Gb/s), ODU2 (10Gb/s) kanye ne-ODU3 (40Gb/s), imbudumbudu ye-bandwidth yesendlalelo se-optical ingubude be-wavelength, uma kuqhathaniswa ne-granularity yokuhlela ye-SDH VC-12/VC-4, i-OTN multiplexing, crossover futhi Izinhlayiya ezimisiwe ngokusobala zinkulu kakhulu, ezingathuthukisa kakhulu ukuguquguquka nokusebenza kahle kokudluliselwa kwezinsizakalo zamakhasimende zedatha yomkhawulokudonsa ophezulu.

3. Amandla anamandla okuphatha phezu kwe-overhead kanye nokunakekela i-OTN inikeza amandla okuphatha okungaphezulu afana ne-SDH, futhi uhlaka lwe-OTN lohlaka lwesendlalelo se-OTN Optical Channel (OCh) luthuthukisa kakhulu amandla okuqapha edijithali alesi sendlalelo.Ukwengeza, i-OTN iphinde ihlinzeke ngomsebenzi wokuqapha uxhumano lwe-serial (TCM) olwendlalelo oluyisi-6, okwenza kube nokwenzeka ukwenza ukuqapha kokusebenza kwezingxenye eziningi kanye nezingxenye eziningi ngesikhathi esisodwa phakathi nenethiwekhi ye-OTN.Ihlinzeka ngezindlela zokuphatha ezifanele zokudlulisa ama-cross-opharetha.

4. Amakhono okuxhumana athuthukisiwe kanye nokuvikela Ngokusungulwa kwesakhiwo sefreyimu ye-OTN, i-ODUk crossover kanye ne-multi-dimensional reconfigurable optical add-drop multiplexer (ROADM), ikhono lokuxhumana lenethiwekhi yezokuthutha ezibonakalayo liye lathuthukiswa kakhulu, futhi i-SDHVC-based 12 /VC-4 ukuhlela umkhawulokudonsa kanye nesimo se-WDM point-to-point ehlinzeka nge-bandwidth yomthamo omkhulu wokudlulisa.Ukwamukelwa kobuchwepheshe bokulungiswa kwamaphutha angaphambili (i-FEC) kukhulisa kakhulu ibanga lokudluliswa kwezingqimba ze-optical.Ukwengeza, i-OTN izohlinzeka ngemisebenzi yokuvikela isevisi eguquguqukayo esekelwe kungqimba kagesi kanye nongqimba olubonayo, njengokuvikelwa kokuxhumeka kwenethiwekhi ye-photonic okusekelwe kungqimba ye-ODUk (SNCP) nokuvikelwa kwenethiwekhi yendandatho okwabelwana ngayo, isiteshi esibonakalayo esisekelwe kungqimba noma ukuvikelwa kwesigaba se-multiplex, njll. Kodwa ubuchwepheshe bendandatho eyabiwe abukamiswa.