Lub cim tshiab ntawm OTN thev naus laus zis yog tsim los ntawm lub hauv paus ntawm kev sib txuas lus qub. Raws li WDM thev naus laus zis, OTN nthuav qhia SDH lub zog ua haujlwm, kev saib xyuas, kev tswj hwm thiab kev ua haujlwm (OAM) muaj peev xwm los ntawm kev muaj peev xwm kis tau tus mob loj, thiab ua rau SDH tsis muaj lub luag haujlwm thiab kev tswj xyuas nyiaj siv ua haujlwm thaum ntsib cov txheej txheem sib kis. OTN tau txais txiaj ntsig zoo dua ntawm SDH thiab WDM, thiab tuaj yeem zam cov teeb meem hauv cov kab ke ib txwm muaj. Tam sim no,OTNtau dhau los ua cov ntaub ntawv siv ntau tshaj plaws rau cov neeg siv khoom broadband.
OTN Network yog dab tsi?
Lub sij hawm OTN (optical transmission network) yog txhais los ntawm International telecommunication union telecommunications standardization unit (ITU-T). OTN thev naus laus zis tuaj yeem ua tiav kev sib kis, rov siv dua thiab saib xyuas cov cim lag luam hauv qhov chaw kho qhov muag, thiab ua kom nws cov txiaj ntsig kev ua tau zoo thiab muaj sia nyob. Ntau SDH thiab WDM kis tau tus mob network ua haujlwm thiab lub hauv paus ntsiab lus tuaj yeem hloov mus rau OTN network.
Txawm hais tias 0TN coj los ua ke tag nrho cov txiaj ntsig ntawm SDH thiab WDM network thev naus laus zis thiab muaj peev xwm hloov SDH thiab WDM ntawm nws tus kheej, nws cov txheej txheem daim ntawv thov tseem tsis zoo tag nrho, yog li nws yog qhov tsim nyog los tswj kev sib koom ua ke thiab kev sib koom tes ntawm OTN. , SDH and WDM. Txhawm rau kom paub txog kev sib koom ua ke ntawm peb lub thev naus laus zis, digital ntim tshuab hauv OTN ua lub luag haujlwm tseem ceeb. Raws li cov cuab yeej tshiab hauv OTN, nws tsis tuaj yeem ua tiav kev tswj hwm kev thauj mus los ntawm "encapsulating" cov ntaub ntawv qub, tab sis kuj tsim OTN tus neeg siv khoom (xws li SONET / SDH, IP, ATM) kev sib txuas hauv nroog loj thiab cov tub ntxhais network.
Tsib qhov zoo ntawm OTN network
OTN networksmuab cov txiaj ntsig zoo ntawm kev tsim kho qhov muag thiab hluav taws xob ua kom muaj peev xwm kis tau tus mob loj rau lub wavelength / sub wavelength, kev sib txuas pob tshab, thiab kev tiv thaiv cov cab kuj. Nws lub ntsiab zoo yog raws li nram no:
(1) Standard hierarchy: OTN hierarchy muaj xws li multiplexing hierarchy, uas txhais raws nraim li cas tus nqi qis yuav pub rau tus nqi siab dua. Qhov no ua rau WDM platform tau xa ncaj qha mus rau cov kev pabcuam qis qis hauv 10Gbps, 40Gbps, lossis 100Gbps kis tau tus mob network yam tsis tas yuav tsum muaj kev sib txuas sab nraud wavelength demultiplexing thiab phau ntawv sib txuas.
(2) Transmission muaj peev xwm nthuav dav: OTN networkk tuaj yeem siv tau los ntawm cov neeg ua haujlwm kom siv qhov tsawg tshaj plaws network infrastructure, ua tiav cov kev pabcuam zoo, rau LAN, txiv neej thiab broadband nkag network los muab cov peev txheej muaj peev xwm.
(3) Kev txo nqi: OTN network tuaj yeem xa ntau tus neeg siv khoom ntawm ib lub wavelength, thiab khaws nws cov kev cai tshwj xeeb, uas tuaj yeem txo tus nqi xa tawm tag nrho thaum ua kom muaj txiaj ntsig zoo siv bandwidth.
(4) Teem sijhawm yooj yim: kev tsim kho ntawm OTN network tuaj yeem tsis tsuas yog txhawb nqa lub network kis tau tus mob tam sim no, tab sis kuj raws li cov kev xav tau ntawm kev lag luam los npaj rau yav tom ntej, los ntawm qhov kawg-rau-kawg teem tau yooj yim txuas mus rau lub nplhaib network thiab mesh. network.
(5) Transparent thauj: pob tshab thauj khoom tseem ceeb heev rau cov neeg muab kev pabcuam muab kev pabcuam ntau yam. Transparency ntawmOTNenables lub network los tuav ib qho kev pabcuam, suav nrog Ethernet, cia, digital video, thiab SONET / SDH, tsis muaj kev cuam tshuam lub sijhawm ntawm tus neeg siv khoom.
