DWDM thiab OTN yog ob txoj kev siv tshuab tsim los ntawm wavelength division transmission technology nyob rau hauv xyoo tas los no: DWDM tuaj yeem suav tau tias yog PDH yav dhau los (point-to-point kis tau tus mob), thiab cov kev pabcuam hauv online thiab offline tau ua tiav ntawm ODF los ntawm kev sib tw nyuaj;OTN zoo li SDH (ntau hom Networking), nrog rau kev ua haujlwm ntawm kev sib txuas (txawm tias nws yog qhov sib txuas ntawm hluav taws xob txheej lossis txheej txheej kho qhov muag).
Nrog rau kev nrawm nrawm ntawm cov txheej txheem ntawm TXHUA tus IP, tam sim no, tsis hais txog lub teb chaws qaum teb, lub xeev qaum teb lossis hauv zos network WDM system, OTN yog qhov tseem ceeb thaum xaiv cov cuab yeej hauv thawj theem ntawm kev tsim network.Cov cuab yeej OTN tau maj mam hloov DWDM cov cuab yeej nrog nws qhov zoo (zoo ib yam li cov khoom siv SDH hloov PDH cov cuab yeej).Raws li cov cuab yeej tshiab thiab cov khoom siv tshiab, OTN tau dhau los ua qhov tseem ceeb ntawm kev lag luam tam sim no.Kab lus no yuav txheeb xyuas thiab sib piv DWDM, OTN cov cuab yeej thiab thev naus laus zis.
1 Cov ntsiab lus tseem ceeb ntawm DWDM thiab OTN
Nrog rau kev hloov ntawm cov kev pab cuam thiab granularity, nws yog ib qho tsim nyog rau multiplex loj-granularity cov kev pab cuam los ntawm optical fibers (ib leeg-fiber los yog dual-fiber) thiab ces faib lawv mus rau hauv sib txawv wavelengths rau kev sib kis mus ntev.Lub wavelength division multiplexing technology tshwm sim raws li lub sijhawm xav tau.
DWDM yog wavelength division multiplexing (Wavelength Division Multiplexing), uas multiplexes optical signals sib txawv wavelengths rau tib fiber ntau rau kev sib kis.WDM thev naus laus zis yog ib qho kev paub zoo tshaj plaws ntawm kev sib faib wavelength technology rau ntau tshaj kaum xyoo.Nws tuaj yeem muab faib ua ob qhov tshwj xeeb: sparse wavelength division multiplexing (CWDM), nrog lub sijhawm wavelength loj (20nm);ntom wavelength division multiplexing (DWDM), nrog lub me me wavelength interval (tsawg dua los yog sib npaug rau 0.8nm).Vim yog qhov luv luv ntawm kev sib kis ntawm CWDM, ntau tus DWDM cov khoom siv tau muab tso rau hauv cov kev sib txuas uas twb muaj lawm ntawm ntau tus tswv.
Lub kaw lus qhib DWDM muaj cov hauv qab no: OTM ua tiav cov kev pabcuam thauj khoom thiab tshem tawm rau qhov chaw nres tsheb kho qhov muag, OA ua tiav qhov kev ua haujlwm ntawm optical relay amplification ua tiav ntawm cov teeb liab multiplexed rau optical kab amplifying chaw nres tsheb, thiab OTU ua tiav qhov tsis yog tus qauv. wavelength teeb liab lub teeb kom tau raws li G.694.1(2) wavelength conversion muaj nuj nqi ntawm tus qauv wavelength teeb liab teeb liab, OMU/ODU: ua kom tiav cov multiplexing/demultiplexing ntawm G.694.1(2) tsau wavelength teeb liab teeb, OBA (lub hwj chim amplifier) kev txhim kho Lub zog ntawm cov teeb liab sib xyaw ua ke los ntawm kev nce, yog li ua kom cov zis hluav taws xob kho qhov muag ntawm txhua lub wavelength, thiab OPA (pre-amplification) txhim kho qhov tau txais rhiab heev ntawm txhua lub wavelength los ntawm kev ua kom lub zog kho qhov muag ntawm cov tswv yim multiplexed teeb liab.
OTN yog Optical Transport Network (Optical Transport Network), tseem hu ua OTH (Optical Transport Hierarchy) hauv ITU-T.Nws tau tsim los ntawm kev faib cov wavelength ib txwm muaj thiab ua ke qhov zoo ntawm DWDM thiab SDH.Nws koom ua ke qhov zoo ntawm cov khoom siv kho qhov muag thiab cov khoom siv hluav taws xob ua haujlwm, muab lub peev xwm sib kis tau loj, pob tshab kawg-rau-kawg wavelength / sub-wavelength kev twb kev txuas thiab cov cab kuj-theem kev tiv thaiv, thiab yog ib qho zoo heev technology rau kev xa xov broadband loj-particle cov kev pab cuam.Hauv tsib xyoos dhau los, cov neeg ua haujlwm tau siv cov cuab yeej OTN ntawm qhov loj hauv ntau qhov sib txuas sib txuas.
2 Kev sib piv ntawm cov yam ntxwv ntawm DWDM thiab OTN
Txawm hais tias DWDM system zoo heev txhim kho kev sib kis ntawm cov khoom siv kho qhov muag thiab txhawb nqa kev sib kis ntawm cov kev pabcuam loj-granularity, vim muaj kev txwv ntawm kev faib tshuab wavelength, wavelengths tau teeb tsa hauv daim ntawv point-to-point thiab tsis tuaj yeem hloov kho dynamically.Kev siv cov peev txheej tsis siab, thiab qhov hloov pauv ntawm kev pabcuam tsis txaus.Kev khiav lag luam tau hloov pauv, thiab nws yog qhov nyuaj heev los kho.Lub sijhawm teem sijhawm ntawm DWDM cov kev pabcuam yog feem ntau lub sijhawm teem sijhawm ntawm ODF.Kev tswj xyuas lub network tsuas yog saib xyuas kev ua haujlwm ntawm cov txheej txheem kho qhov muag (lub network tswj bytes tsawg tsawg thiab cov ntaub ntawv tswj hwm lub network yooj yim), thiab muaj ob peb txoj hauv kev daws teeb meem thiab kev saib xyuas nyuaj.
OTN tau txais txiaj ntsig loj-muaj peev xwm kis tau tus mob ntawm DWDM thiab muaj qhov hloov pauv hloov kho optoelectronic sib koom ua ke thiab muaj peev xwm tiv thaiv.Los ntawm kev qhia txog ROADM thev naus laus zis, OTH thev naus laus zis, G.709 encapsulation thiab tswj lub dav hlau, nws daws qhov teeb meem ntawm cov tsoos WDM tes hauj lwm yam tsis muaj wavelength/sub-wavelength kev pab cuam teem sij hawm muaj peev xwm., Kev sib txuas tsis muaj peev xwm, kev tiv thaiv tsis muaj zog thiab lwm yam teeb meem.Cov txheej txheem hluav taws xob siv sijhawm teem caij raws li cov wavelengths (xws li GE, 2.5G, 10G, 40G, 100G hais), thiab cov txheej txheem kho qhov muag feem ntau yog raws li 10G, 40G lossis 100G wavelengths, nrog kev siv bandwidth siab;nws muaj ntau tshaj nyiaj siv ua haujlwm bytes, thiab nws OAM Cov haujlwm / P muaj zog dua WDM.
Tsis tas li ntawd, OTN thiab DWDM tuaj yeem siv tau ntau yam ntawm cov txheej txheem kho qhov muag, qhov txawv yog tias OTN muaj cov txheej txheem hluav taws xob subframe.Yog li ntawd, qee cov khoom siv DWDM ntawm lub network uas twb muaj lawm tau ntxiv nrog cov khoom siv hluav taws xob sib txuas sib txuas thiab hloov kho rau OTN.
3 DWDM thiab OTN network sib piv
Kev sib xyaw ua ke ntawm OTN thiab DWDM yuav poob qhov zoo ntawm OTN (cov qauv qauv txawv ntawm WDM ib txwm muaj, thiab kev sib txuas yuav muaj kev cuam tshuam).
Txij li thaum OTN optical cross-connect yog tsuas yog siv los ntawm ROADM module (loaded nrog WSS hloov), xav txog tus nqi siab ntawm ROADM, OM / OD thiab OADM yog siv los tsim lub nplhaib network thiab cov saw hlau hauv OTN networking.
Rau cov chained tes hauj lwm (xws li cov kab ntev-ntev kab), qhov zoo ntawm OTN tsis tas yuav tsum tau tshwm sim vim yog cov kev pabcuam nruab nrab thiab kev tiv thaiv, tab sis tseem muaj qhov zoo ntawm qee yam (siab channel efficiency ua rau cov nqi qis dua. tsoos WDM), lub cev lub cev tam sim no feem ntau siv DWDM thiab OTN rau kev sib txuas lus superimposed.
Rau lub network hauv zos, txij li cov kev pabcuam yuav tsum tau txuas nrog ntau zaus, cov qauv network tau hloov pauv ntau zaus thiab teem sijhawm, thiab txoj kev tiv thaiv yuav tsum tau hloov pauv hloov pauv, cov tsoos WDM yuav tsum ua tsis tau.Qhov zoo ntawm kev siv OTN networking yog qhov tseeb ntawm tus kheej.
OTN muab lub peev xwm los tswj txhua qhov wavelength ntawm txhua fiber ntau, thiab OTN tuaj yeem hloov kho kom zoo dua rau kev txhim kho network yav tom ntej.
4 Kev sib piv ntawm DWDM thiab OTN Bearer Services
Qhov kev thov rau OTN hluav taws xob crossover los ntawm qhov tshwm sim ntawm ib leeg-yoj 10G tus nqi.Thaum lub channel ncav cuag 10G, nws OTU tuaj yeem nqa 4 * 2.5G lossis 8 txog 9 GEs;DWDM siv txoj kev taw tes rau-taw tes.Yog tias qhov kev thov kev pabcuam me me, OTU peev zoo li khib nyiab.Txog rau qhov kawg no, nws yog ib qho tsim nyog los qhia txog kev sib txuas ua haujlwm zoo ib yam li SDH ntawm DWDM, txhawm rau txhim kho cov hluav taws xob sib txuas ntawm OTN.
OTN muaj hluav taws xob crossover muaj peev xwm, uas yog, sub-rate crossover peev xwm ib channel (ntau npaum li SDH).Nyob rau tib lub sij hawm, optical cross-connection thiab hluav taws xob cross-connection yog ywj siab ntawm ib leeg.Yog tias muaj kev sib txuas ntawm optical tab sis tsis muaj hluav taws xob sib txuas, lossis kev sib txuas hluav taws xob tsis muaj kev sib txuas ntawm optical, nws tuaj yeem hu ua OTN.
Vim qhov sib txawv ntawm kev tsim qauv hauv network (tus nqi, kev pabcuam particle thiab ntws cov kev taw qhia), txoj kev siv hluav taws xob crossover feem ntau yog siv nyob rau hauv Suav teb, thiab optical crossover txoj kev yog feem ntau siv txawv teb chaws.
5 Kev xaus
Los ntawm kev txheeb xyuas thiab kev sib piv saum toj no, nws tuaj yeem pom tau tias OTN thiab DWDM yog qhov sib txawv ntawm cov cuab yeej thiab kev siv.Los ntawm qhov kev xav ntawm kev sib txuas muaj peev xwm, kev pabcuam granularity thiab kev sib txuas yooj yim, OTN muaj zog heev thiab tuaj yeem ua tau raws li qhov xav tau ntawm kev sib txuas hauv network yav tom ntej.
Vim lub pob tshab ntawm OTN qhov kev pab cuam kis tau tus mob, muaj peev xwm kho qhov yuam kev, hloov kho qhov muag / hluav taws xob txheej txheej txheej txheem, kev tswj xyuas muaj peev xwm thiab scalability ntawm cov cuab yeej muaj peev xwm (80 * 100G cov cuab yeej yog tam sim no ua lag luam), ntau yam kev sib txuas lus Kev taw qhia ntawm OTN cov cuab yeej muaj ua inevitable.
Post lub sij hawm: Oct-25-2022