Nws yog lub network xa xov tseem ceeb ntawm tiam tom ntej. Hais yooj yim xwb, nws yog lub network xa xov ntawm tiam tom ntej uas siv wavelength.
OTN yog ib lub network thauj mus los raws li wavelength division multiplexing technology uas teeb tsa lub network ntawm optical layer, thiab yog lub backbone transport network ntawm tiam tom ntej. OTNyog ib tiam tshiab ntawm "digital transmission system" thiab "optical transmission system" uas tswj hwm los ntawm cov lus pom zoo ntawm ITU-T xws li G.872, G.709, thiab G.798. Nws yuav daws qhov teeb meem ntawm tsis muaj wavelength/sub-wavelength cov kev pabcuam hauv WDM networks ib txwm muaj. Cov teeb meem xws li kev teem sijhawm tsis zoo, kev sib txuas lus tsis zoo, thiab kev tiv thaiv tsis zoo. OTN daws tau ntau yam teeb meem ntawm cov kab ke ib txwm muaj los ntawm ntau cov txheej txheem.
OTN npog thaj chaw hluav taws xob ib txwm muaj (kev xa xov digital) thiab thaj chaw kho qhov muag (kev xa xov analog), thiab yog tus qauv sib koom ua ke rau kev tswj hwm thaj chaw hluav taws xob thiab kho qhov muag.
Lub hom phiaj tseem ceeb ntawm Kev ua haujlwm OTNyog kev lag luam theem wavelength, uas thawb lub network thauj mus rau theem ntawm lub network optical ntau-wavelength tiag tiag. Vim yog kev sib xyaw ua ke ntawm cov txiaj ntsig ntawm optical domain thiab kev ua haujlwm hluav taws xob, OTN tuaj yeem muab lub peev xwm xa xov loj heev, kev sib txuas wavelength / sub-wavelength pob tshab tag nrho thiab kev tiv thaiv carrier-class, thiab yog cov thev naus laus zis zoo tshaj plaws rau kev xa cov kev pabcuam broadband loj.
qhov zoo tshaj plaws
Qhov zoo tshaj plaws ntawm OTN yog tias nws yog qhov sib xws tag nrho, nws tuaj yeem tsim los ntawm cov haujlwm tswj hwm SONET / SDH uas twb muaj lawm, nws tsis tsuas yog muab kev pom tseeb ntawm cov txheej txheem sib txuas lus uas twb muaj lawm, tab sis kuj muab kev sib txuas kawg-rau-kawg thiab kev sib txuas lus rau WDM, Nws muab cov lus qhia ntawm kev sib txuas ntawm cov txheej txheem optical rau ROADM, thiab ntxiv rau cov peev xwm sib sau ua ke thiab kev tu cev. Qhov txuas kawg-rau-kawg thiab kev sib txuas lus muaj peev xwm feem ntau yog tsim los ntawm SDH, thiab tus qauv ntawm cov txheej txheem optical yog muab.
Lub tswv yim OTN npog cov txheej txheem kho qhov muag thiab cov txheej txheem hluav taws xob, thiab nws cov thev naus laus zis tau txais txiaj ntsig ob qho ntawm SDH thiab WDM. Cov yam ntxwv tseem ceeb yog raws li nram no:
1. Ntau yam kev teeb tsa ntawm cov neeg siv khoom thiab kev xa tawm pob tshab Cov qauv OTN thav duab raws li ITU-TG.709 tuaj yeem txhawb nqa kev kos duab thiab kev xa tawm pob tshab ntawm ntau yam teeb liab ntawm cov neeg siv khoom, xws li SDH, ATM, Ethernet, thiab lwm yam. Kev kos duab txheem thiab kev xa tawm pob tshab tuaj yeem ua tiav rau SDH thiab ATM, tab sis kev txhawb nqa rau Ethernet ntawm cov nqi sib txawv yog txawv. ITU-TG.sup43 muab cov lus qhia ntxiv rau 10GE cov kev pabcuam kom ua tiav ntau qib ntawm kev xa tawm pob tshab, thaum rau GE, 40GE, 100GE Ethernet, cov kev pabcuam network ntiag tug Fibre Channel (FC) thiab nkag mus rau cov kev pabcuam network Gigabit Passive Optical Network (GPON)), thiab lwm yam, txoj kev kos duab txheem rau OTN thav duab tam sim no tab tom tham txog.
2. Bandwidth multiplexing, crossover thiab configuration ntawm cov khoom loj Cov khoom siv hluav taws xob bandwidth txhais los ntawm OTN yog cov khoom siv optical channel data units (O-DUk, k = 0,1,2,3), uas yog ODUO (GE, 1000M / S) ODU1 (2.5Gb / s), ODU2 (10Gb / s) thiab ODU3 (40Gb / s), qhov bandwidth granularity ntawm cov txheej optical yog wavelength, piv rau qhov teem sijhawm granularity ntawm SDH VC-12 / VC-4, OTN multiplexing, crossover thiab Cov khoom teeb tsa yog qhov loj dua, uas tuaj yeem txhim kho qhov kev hloov pauv thiab kev sib kis ntawm cov kev pabcuam cov neeg siv khoom siab bandwidth.
3. Muaj peev xwm tswj hwm kev siv hluav taws xob thiab kev saib xyuas zoo OTN muab cov peev xwm tswj hwm kev siv hluav taws xob zoo ib yam li SDH, thiab cov qauv OTN ntawm OTN Optical Channel (OCh) txheej ua rau muaj peev xwm saib xyuas digital ntawm txheej no zoo heev. Tsis tas li ntawd, OTN kuj muab 6-txheej nested serial connection monitoring (TCM) function, uas ua rau nws muaj peev xwm ua tiav qhov kawg-rau-kawg thiab ntau ntu kev ua haujlwm saib xyuas tib lub sijhawm thaum OTN networking. Muab cov txhais tau tias tswj hwm kom zoo rau kev sib kis hla-tus neeg teb xov tooj.
4. Kev txhim kho kev sib txuas lus thiab kev tiv thaiv peev xwm Los ntawm kev qhia txog OTN thav duab qauv, ODUk crossover thiab ntau-dimensional reconfigurable optical add-drop multiplexer (ROADM), lub peev xwm sib txuas lus ntawm lub network thauj khoom optical tau txhim kho zoo heev, thiab SDHVC-based 12/VC-4 scheduling bandwidth thiab qhov xwm txheej ntawm WDM point-to-point muab cov peev xwm loj bandwidth kis tau tus mob. Kev siv cov thev naus laus zis kho qhov yuam kev pem hauv ntej (FEC) ua rau qhov deb ntawm kev sib kis txheej optical ntau ntxiv. Tsis tas li ntawd, OTN yuav muab cov haujlwm tiv thaiv kev pabcuam yooj yim dua raws li txheej hluav taws xob thiab txheej optical, xws li ODUk txheej-raws li photonic network connection protection (SNCP) thiab kev sib koom ua ke network protection, optical txheej-raws li optical channel lossis multiplex section protection, thiab lwm yam. Tab sis kev sib koom ua ke ring technology tseem tsis tau raug standardized.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-01-2022