DWDM thiab OTN yog ob lub tshuab kev tsim kho tshiab los ntawm kev siv tshuab wavelength division transmission hauv xyoo tas los no: DWDM tuaj yeem suav tias yog PDH yav dhau los (point-to-point transmission), thiab cov kev pabcuam online thiab offline tau ua tiav ntawm ODF los ntawm cov jumpers nyuaj; OTN zoo li SDH (ntau hom Networking), nrog rau kev ua haujlwm ntawm kev sib txuas (seb nws yog kev sib txuas ntawm cov txheej hluav taws xob lossis cov txheej optical).
Nrog rau kev ua kom nrawm nrawm ntawm cov txheej txheem ntawm ALL IP, tam sim no, tsis hais lub teb chaws tus txha nraub qaum, lub xeev tus txha nraub qaum lossis lub zos WDM system, OTN yog lub hauv paus tseem ceeb thaum xaiv cov khoom siv hauv theem pib ntawm kev tsim kho network. Cov khoom siv OTN tau hloov maj mam DWDM cov khoom siv nrog nws cov txiaj ntsig tshwj xeeb (Zoo ib yam li SDH cov khoom siv hloov PDH cov khoom siv). Raws li cov thev naus laus zis tshiab thiab cov khoom tshiab, OTN tau dhau los ua qhov tseem ceeb ntawm kev lag luam tam sim no. Tsab xov xwm no yuav tshuaj xyuas thiab piv DWDM, OTN cov khoom siv thiab thev naus laus zis.
1 Cov ntsiab lus yooj yim ntawm DWDM thiab OTN
Nrog rau kev hloov pauv ntawm cov kev xav tau kev pabcuam thiab qhov sib txawv, nws yog qhov tsim nyog los ua kom muaj ntau yam kev pabcuam loj-granularity los ntawm cov fibers optical (ib-fiber lossis dual-fiber) thiab tom qab ntawd faib lawv mus rau hauv ntau qhov wavelengths rau kev sib kis mus deb. Lub tshuab wavelength division multiplexing tshwm sim raws li lub sijhawm xav tau.
DWDM yog wavelength division multiplexing (Wavelength Division Multiplexing), uas multiplexes cov teeb liab optical ntawm cov wavelengths sib txawv rau hauv tib lub fiber rau kev sib kis. WDM thev naus laus zis yog ib qho kev siv tshuab wavelength division uas paub tab heev rau ntau tshaj kaum xyoo. Nws tuaj yeem muab faib ua ob qho kev qhia tshwj xeeb: sparse wavelength division multiplexing (CWDM), nrog lub sijhawm wavelength loj (20nm); dense wavelength division multiplexing (DWDM), nrog lub sijhawm wavelength me me (tsawg dua lossis sib npaug rau 0.8nm). Vim yog qhov kev sib kis luv luv ntawm CWDM, ntau lub cuab yeej DWDM tau xa mus rau hauv cov tes hauj lwm sib kis uas twb muaj lawm ntawm ntau tus neeg teb xov tooj.
Lub kaw lus DWDM qhib muaj cov ntu hauv qab no: OTM ua tiav kev pabcuam thauj khoom thiab tshem tawm rau qhov chaw nres tsheb kab kho qhov muag, OA ua tiav cov txheej txheem kho qhov muag relay amplification ntawm cov teeb liab multiplexed rau qhov chaw nres tsheb kab kho qhov muag, thiab OTU ua tiav cov teeb liab wavelength tsis yog tus qauv kom tau raws li G .694.1 (2) wavelength hloov pauv ntawm cov teeb liab wavelength txheem, OMU / ODU: ua tiav multiplexing / demultiplexing ntawm G.694.1 (2) teeb liab wavelength ruaj khov, OBA (lub zog amplifier) txhim kho lub zog ntawm cov teeb liab kho qhov muag ua ke los ntawm kev nce , yog li ua rau lub zog kho qhov muag tso zis ntawm txhua qhov wavelength, thiab OPA (pre-amplification) txhim kho qhov kev txais tos ntawm txhua qhov wavelength los ntawm kev nce lub zog kho qhov muag ntawm cov teeb liab multiplexed.
OTN yog ib lub Optical Transport Network (Optical Transport Network), tseem hu ua OTH (Optical Transport Hierarchy) hauv ITU-T. Nws tau tsim los ntawm kev faib wavelength ib txwm muaj thiab ua ke cov txiaj ntsig ntawm DWDM thiab SDH. Nws koom ua ke cov txiaj ntsig ntawm optical domain thiab kev ua haujlwm hluav taws xob, muab lub peev xwm xa xov loj heev, kev sib txuas wavelength / sub-wavelength pob tshab thiab kev tiv thaiv theem nqa khoom, thiab yog ib qho thev naus laus zis zoo heev rau kev xa cov kev pabcuam broadband loj. Hauv tsib xyoos dhau los, cov neeg teb xov tooj tau xa cov khoom siv OTN ntawm qhov loj hauv ntau lub network xa xov.
2 Kev sib piv ntawm cov yam ntxwv ntawm DWDM thiab OTN
Txawm hais tias lub kaw lus DWDM txhim kho qhov kev ua haujlwm ntawm cov fibers optical thiab txhawb nqa kev xa cov kev pabcuam loj-granularity, vim muaj kev txwv ntawm cov thev naus laus zis faib wavelength, wavelengths tau teeb tsa hauv daim ntawv taw tes-rau-taw tes thiab tsis tuaj yeem hloov kho dynamically. Tus nqi siv cov peev txheej tsis siab, thiab qhov yooj ywm ntawm kev hloov kho kev pabcuam tsis txaus. Kev ntws ntawm kev lag luam tau hloov pauv, thiab nws nyuaj heev rau kev hloov kho. Kev teem sijhawm ntawm DWDM cov kev pabcuam yog feem ntau yog kev teem sijhawm lub cev ntawm ODF. Kev tswj hwm network tsuas yog saib xyuas kev ua haujlwm ntawm cov txheej txheem optical (cov bytes tswj hwm network yog ob peb thiab cov ntaub ntawv tswj hwm network yog yooj yim), thiab muaj ob peb txoj hauv kev daws teeb meem thiab kev nyuaj siab txij nkawm.
OTN tau txais kev ua haujlwm xa xov loj ntawm DWDM thiab muaj kev sib koom ua ke optoelectronic thiab kev tiv thaiv. Los ntawm kev qhia txog ROADM thev naus laus zis, OTH thev naus laus zis, G.709 encapsulation thiab tswj dav hlau, nws daws qhov teeb meem ntawm cov tes hauj lwm WDM ib txwm tsis muaj wavelength / sub-wavelength kev pabcuam teem sijhawm. , Kev muaj peev xwm sib txuas lus tsis muaj zog, kev tiv thaiv tsis muaj zog thiab lwm yam teeb meem. Cov txheej hluav taws xob siv kev teem sijhawm raws li sub-wavelengths (xws li GE, 2.5G, 10G, 40G, 100G particles), thiab kev teem sijhawm txheej optical feem ntau yog raws li 10G, 40G lossis 100G wavelengths, nrog kev siv bandwidth siab; nws muaj ntau overhead bytes, thiab nws OAM Lub luag haujlwm /P muaj zog dua WDM.
Ntxiv mus, OTN thiab DWDM siv tau ua ke 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 subframes hluav taws xob sib txuas thiab hloov kho rau OTN.
3 Kev sib piv ntawm DWDM thiab OTN networking
Kev sib xyaw ua ke ntawm OTN thiab DWDM yuav poob qhov zoo ntawm OTN (cov qauv thav duab txawv ntawm WDM ib txwm muaj, thiab kev sib txuas yuav muaj kev cuam tshuam).
Vim tias OTN optical cross-connect feem ntau yog siv los ntawm ROADM module (loaded nrog WSS switch), xav txog tus nqi siab ntawm ROADM, OM/OD thiab OADM yog siv los tsim lub nplhaib network thiab saw network hauv OTN networking.
Rau cov tes hauj lwm chained (xws li cov kab ntev ntev), qhov zoo ntawm OTN tsis tas yuav tsum tau pom tag nrho vim yog cov kev pabcuam nruab nrab thiab kev tiv thaiv, tab sis tseem muaj qhov zoo hauv qee qhov (kev ua haujlwm siab channel ua rau cov nqi qis dua li WDM ib txwm muaj), lub network tam sim no feem ntau siv DWDM thiab OTN rau kev sib txuas lus superimposed.
Rau lub network hauv zos, vim tias cov kev pabcuam yuav tsum tau txuas nrog ntau zaus, cov qauv network feem ntau hloov pauv thiab teem sijhawm, thiab txoj kev tiv thaiv yuav tsum tau hloov pauv tau yooj yim, WDM ib txwm yuav tsum tsis tuaj yeem ua li ntawd. Qhov zoo ntawm kev siv OTN networking yog qhov pom tseeb.
OTN muab lub peev xwm los tswj txhua qhov wavelength ntawm txhua lub fiber, thiab OTN tuaj yeem hloov kho 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 hla los ntawm qhov tshwm sim ntawm ib-yoj 10G tus nqi. Thaum ib txoj kab mus txog 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, kev nqis peev OTU zoo li pov tseg. Txog qhov kawg no, nws yog qhov tsim nyog los qhia txog kev ua haujlwm hla-txuas zoo ib yam li SDH ntawm DWDM, yog li txhim kho kev ua haujlwm hla-txuas hluav taws xob ntawm OTN.
OTN muaj peev xwm hla hluav taws xob, uas yog, muaj peev xwm hla tus nqi qis dua ib channel (zoo ib yam li SDH). Tib lub sijhawm, kev sib txuas ntawm qhov muag thiab kev sib txuas ntawm hluav taws xob yog ywj pheej ntawm ib leeg. Yog tias muaj peev xwm hla kev sib txuas ntawm qhov muag tab sis tsis muaj kev sib txuas ntawm hluav taws xob, lossis kev sib txuas ntawm hluav taws xob yam tsis muaj kev sib txuas ntawm qhov muag, nws tuaj yeem hu ua OTN.
Vim muaj qhov sib txawv ntawm cov qauv tsim kho network (tus nqi, cov khoom siv pabcuam thiab kev taw qhia ntws), feem ntau siv txoj kev hla hluav taws xob hauv Suav teb, thiab txoj kev hla kho qhov muag feem ntau siv txawv teb chaws.
5 Xaus Lus
Los ntawm kev tshuaj xyuas thiab kev sib piv saum toj no, nws tuaj yeem pom tias OTN thiab DWDM sib txawv ntawm cov thev naus laus zis thiab daim ntawv thov. Los ntawm qhov kev xav ntawm kev sib txuas lus, kev pabcuam granularity thiab kev ywj pheej ntawm network, OTN muaj zog heev thiab tuaj yeem ua tau raws li qhov xav tau ntawm kev sib txuas lus network yav tom ntej.
Vim yog qhov pom tseeb ntawm OTN system kev pabcuam kis tau zoo, muaj peev xwm kho qhov yuam kev tau zoo, muaj peev xwm teem sijhawm kho qhov muag / hluav taws xob tau yooj yim, muaj peev xwm tswj kev txij nkawm thiab muaj peev xwm nthuav dav ntawm cov khoom siv (80 * 100G khoom siv tam sim no tau muag), ntau yam kev sib txuas lus sib txuas lus Kev qhia txog OTN cov khoom siv tau dhau los ua qhov tsis zam.
Lub sijhawm tshaj tawm: Lub Kaum Hli-25-2022