DWDM Network Tshaj Ntev Lawm Ntev
Li qub, peb tau saib xyuas qee cov ntsiab lus ntawm DWDM networks. Hauv ntu no, peb yuav los xam ob nqe lus nug: DWDM yog dab tsi? Cov khoom ntawm DWDM networks yog dab tsi?
Daim duab 1: DWDM tes hauj lwm
DWDM (Dense Wavelength Division Multiplexing) yog ib qho kev sib txuas ntawm kev sib txuas ntawm qhov muag. Nws muaj peev xwm muab cov ntawv xov xwm tawm los ntawm ntau qhov chaw ua ke ntawm ib tus khoos phis kho ob qho tib si, nrog txhua lub teeb tsa ib txhij nqa ntawm nws tus kheej cais lub teeb ntaj wavelength. Nrog DWDM, mus txog 160 wavelengths nrog ib qho kev sib kis ntawm 0.8 / 0.4 nm (100 GHz / 50 GHz daim phiaj) cais cov wavelengths los yog raws cov ntaub ntawv tuaj yeem xa dua ib zaug xwb qhov muag fiber ntau.
Ua ke, rau DWDM tes hauj lwm, muaj plaub qho khoom siv raws li hauv qab no uas nquag siv los ntawm IT neeg ua haujlwm:
Optical transmitters / receivers
DWDM mux / demux cov ntxaij lim dej
Optical ntxiv / xa multiplexers (OADMs)
Optical amplifiers transponders (wavelength converters)
DWDM Networks Tshaj Lawm Ntev Cov Kev Sib Tham Cov Kev Sib Tham
Xam 2: 40 km DWDM Network
Rau qhov no, 80 km DWDM SFP + modules thiab 40ch DWDM Mux / Demuxs tau pom zoo siv. Txij li 80km DWDM SFP + modules tau txhawb 10G kis hla 40 km, tsis muaj cov cuab yeej siv ntxiv hauv qab no.
Daim duab 3: 80km DWDM Network
Deploying no 80 km DWDM network, peb tseem yuav siv 80km DWDM SFP + modules thiab 40ch DWDM Mux / Demuxs. Lub teeb ci ntawm 80km DWDM SFP + modules yuav tsis muaj peev xwm los txhawb qhov kev ncua ntev xws li kev sib kis, vim muaj tej zaum lub teeb poob thaum lub sij hawm kis tau tus mob. Hauv qhov no, pre-amplifier (PA) feem ntau yog muab tso ua ntej qhov chaw A thiab qhov chaw B kom zoo siab rau lub receiver sensitivity thiab cuag teeb liab kis DWDM nrug. Lub caij no, tus txheej txheem faib cov nyiaj faib tawm (DCM) tuaj yeem raug ntxiv rau qhov txuas no los daws cov kab chromatic dispersion tsis xa me nyuam rov thiab hloov tshiab qhov txuas ntawm qhov txuas. Daim duab saum toj no qhia tias txoj kev xa tawm ntawm qhov 80km DWDM network.
Daim duab 4: 100 km DWDM Network
Hauv qab no, qhov kev siv siv hauv scenario 2 tseem yuav tsum nyob twj ywm. Txij li thaum cov kis tau kis dua lawm, lub hwj huam yuav raug qis dua. Dhau li ntawd, koj tseem yuav tau siv EDFA (BA) kom nrov loj tshaj qhov kev sib tw kho qhov teeb meem ntawm 80km DWDM SFP + modules.
Los ntawm txoj kev, yog tias koj xav kom ncua DWDM kis nrug, koj tuaj yeem nyeem daim ntawv no rau cov kev daws teeb meem: Ncua DWDM Network Kev Sib Tham Nrog Ntau Hom Kev Pab Thauj Tsheb.
Yam Lom Los Yuav Tau Xav Txog Kev Tso Tawm Ntawm DWDM Networks
1. Ua tau raws li muaj fiber ntau tsob nroj. Qee hom fiber ntau tsis tsim nyog siv DWDM. Tam sim no, tus qauv hu ua standard singlemode (G. 652) rau feem ntau ntawm cov khoom siv fais fab, txhawb DWDM hauv cheeb tsam nroog.
2. Muaj qhov kev tsiv tag nrho thiab kev npaj rau kev npaj. Vim hais tias DWDM muaj peev xwm txhawb nqa kev loj hlob hauv kev xav tau ntawm kev siv bandwidth lub sij hawm tsis muaj cov hloov khoom dua tshiab forklift, nws sawv cev rau cov sij hawm ntev. Koj cov nyiaj txiag yuav tsum tso cai rau kev ntxiv cov ntshav, xws li OADMs, kom tau raws li cov kev xav tau ntawm cov neeg siv khoom thiab kev siv.
3. Cov cuab yeej tswj tsev network. Yuav tsum muaj cov cuab yeej tswj cov cuab yeej sib txuas rau cov ntaub ntawv, kev ua haujlwm, kev saib xyuas, kev txheeb xyuas qhov tseeb thiab kev cais tawm, thiab kev kho mob. Xws li lub cuab tam yuav tsum ua raws li cov qauv (SNMP, piv txwv) thiab muaj peev xwm los koom tes nrog kev ua hauj lwm uas twb muaj lawm. Piv txwv, FMT DWDM cov kev daws los ntawm FS.COM muaj peev xwm los txhawb hom kev tswj network, nrog rau NMU kab-card, saib hauv internet, cuab yeej yooj yim, thiab SNMP.
4. Cov teeb meem sib txuas nrog. Vim tias DWDM siv cov kab txuas rau kev sib kis mus rau, kev siv DWDM wavelengths yuav tsum yog tib yam ntawm qhov xaus ntawm txhua qhov kev sib txuas. Tsis tas li ntawd, lwm cov teeb meem ntawm kev sib txuas lus kuj yuav tsum tau xav txog, nrog rau kev tswj fais fab, kev sib txuas ntawm kev sib txuas ntawm kev sib tshuam hauv nruab nrab thiab kev sib txuas lus, PMD (polarization hom dispersion), thiab hom fibre. Tag nrho cov no ua rau cov teeb meem ntawm kev sib kis ntawm ntau lub nruab ntawm Layer 1.
5. Zoo rau kev tiv thaiv thiab kho kom zoo. Tej zaum yuav muaj kev tsis sib haum (khoom lag luam, xws li laser lossis photodetector, thiab ntau cov phom sij) thiab cov teeb meem poob muag xws li teeb liab degradation (piv txwv li, tsis tsim nyog BER). Yog li, koj yuav tsum muaj kev tiv thaiv zoo thaum tab tom npaj lub DWDM network.
6. Kev siv nyiaj siv hluav taws xob los yog kev siv nyiaj txuas. Vim tias tej zaum yuav muaj qhov teeb meem kho qhov muag tsis dhau qhov kev sib kis tau ntev ntev, nws tseem ceeb heev uas yuav tsum muaj peev xwm siv nyiaj txuas ua ntej.
Lus xaus
Nqa zoo tshaj plaws scalability thiab yooj rau tes hauj lwm fiber ntau, DWDM tes hauj lwm daws qhov tseeb obviously nyiam kom txaus, uas yog qhov tseem muaj pov thawj rau yav tom ntej. Hauv no ncej, peb ua ib qho kev tshwm sim ntawm DWDM-based network dhau kev kis mus rau qhov ntev. Tsis tas li ntawd, qee qhov kev qhia rau kev faib ib lub DWDM network kuj tau koom rau koj qhov kev siv.
