1. Kev sib txuas lus kev lag luam kev faib tawm
Raws li ntau hom kev pabcuam kev sib txuas lus, kev sib txuas lus tuaj yeem muab faib ua kev sib txuas lus hauv xov tooj, xov tooj sib txuas lus, cov ntaub ntawv sib txuas lus, thiab cov duab sib txuas lus.Vim hais tias kev sib txuas lus hauv xov tooj yog qhov tsim thiab nrov tshaj plaws, lwm cov kev pabcuam kev sib txuas lus feem ntau kis tau los ntawm kev sib txuas lus hauv xov tooj rau pej xeem, xws li kev sib txuas lus hauv xov tooj thiab cov ntaub ntawv nyob deb, tuaj yeem kis tau los ntawm cov xov tooj.Cov kev pabcuam kev sib txuas lus digital network yog tsim rau cov ntaub ntawv xa mus ntawm ntau hom kev pabcuam.
2. Modulation-raws li kev faib tawm
Raws li seb lub teeb liab kis tau tus mob nyob rau hauv cov channel yog modulated, cov kev sib txuas lus yuav muab faib mus rau hauv ib tug baseband kis tau tus mob system thiab ib tug bandpass kis system.Baseband kis tau tus mob yog qhov ncaj qha kis tau tus mob ntawm unmodulated signals, xws li hauv zos hu xov tooj thiab cable broadcasting;bandpass kis tau tus mob yog ib tug dav lub sij hawm rau modulated kis tau tus mob ntawm ntau yam teeb liab.Muaj ntau txoj hauv kev modulation.Table 1-1 teev qee qhov kev hloov kho uas siv tau.
3. Kev faib tawm raws li cov yam ntxwv ntawm lub teeb liab
Cov kev sib txuas lus tau muab faib ua ib qho kev sib txuas lus analog thiab cov kev sib txuas lus digital raws li seb lub teeb liab analogue lossis cov teeb liab digital kis tau hauv cov channel.
4. Kev faib tawm nruab nrab
Raws li kev sib kis nruab nrab, kev sib txuas lus tuaj yeem muab faib ua ob pawg: kev sib txuas lus hauv xov tooj thiab cov tshuab sib txuas lus wireless.Wired kev sib txuas lus siv cov xov hlau (xws li cov xov hluav taws xob overhead, coaxial cables, optical fibers, waveguides, thiab lwm yam) ua qhov nruab nrab ntawm kev sib txuas lus kom tiav, xws li xov tooj hauv zos, cable TV, submarine cable kev sib txuas lus, thiab lwm yam. electromagnetic nthwv dej yuav tsum taug kev los ntawm qhov chaw.Qhov no yog ua los ntawm luv-yoj ionospheric propagation, microwave kab-ntawm-pob pom propagation, thiab satellite relay, thiab lwm yam.
5. Kev faib ua haujlwm band
Cov khoom siv sib txuas lus tau muab faib ua kev sib txuas lus ntev-yoj, kev sib txuas lus nruab nrab-yoj, kev sib txuas lus luv luv, kev sib txuas lus deb-infrared, thiab lwm yam, raws li qhov zaus lossis wavelength uas nws ua haujlwm.
6. Kev faib tawm los ntawm cov teeb liab multiplexing
Muaj peb txoj hauv kev yooj yim multiplexing rau transmitting multiplexed signals, xws li zaus division multiplexing, time division multiplexing, thiab code division multiplexing.Zaus division multiplexing yog siv txoj kev hloov spectrum los ua cov cim sib txawv nyob ntawm qhov sib txawv ntau zaus;lub sij hawm faib multiplexing yog siv cov mem tes hloov txoj kev los ua cov cim sib txawv nyob ntawm lub sijhawm sib txawv;thiab code division multiplexing yog siv cov lej orthogonal los nqa cov cim sib txawv, raws li.Teeb liab.Kev faib ntau zaus multiplexing yog siv hauv kev sib txuas lus analogue.Nrog rau txoj kev loj hlob ntawm kev sib txuas lus digital, lub sij hawm sib faib multiplexing kev sib txuas lus tau dhau los ua ntau thiab ntau dua.Code division multiplexing feem ntau yog siv hauv kev sib txuas lus spectrum thiab kev sib txuas lus mobile rau kev sib txuas lus hauv chaw.Tsis tas li ntawd, muaj wavelength division multiplexing, thiab space division multiplexing.
Cov saum toj no yog tsab xov xwm "Kev faib tawm ntawm Kev Sib Txuas Lus" coj los rau koj los ntawm Shenzhen HDV phoelectron Technology Co., Ltd. vam tias tsab xov xwm no tuaj yeem pab koj kom koj paub ntau ntxiv.Dhau li ntawm tsab xov xwm no yog tias koj tab tom nrhiav rau lub tuam txhab kev sib txuas lus zoo fiber ntau cov khoom lag luam koj tuaj yeem xav txogtxog peb.
Shenzhen HDV phoelectron Technology Co., Ltd.feem ntau yog cov chaw tsim khoom ntawm cov khoom sib txuas lus.Tam sim no, cov cuab yeej tsim tawm npog lubONU series, Optical module series, OLT series, thiabtransceiver series.Peb tuaj yeem muab cov kev pabcuam customized rau cov xwm txheej sib txawv.Zoo siab txais tossab laj.