Bit Rate vs Baud Rate
Ob tus nqi me ntsis thiab baud tus nqi yog qhov ntsuas qhov nrawm ntawm cov ntaub ntawv hloov chaw. Txawm hais tias tus nqi me ntsis thiab baud tus nqi tuaj yeem yog tus nqi tib yam, qee zaum, ob nqe lus no muaj lub ntsiab lus sib txawv. Tus nqi me ntsis yog tus nqi ntawm cov khoom xa mus hauv ib lub sijhawm, qhov twg baud tus nqi yog tus lej ntawm cov cim tau pauv. Ib lub cim yuav muaj ib lossis ntau qhov me me.
Tus nqi qis
Bit yog chav tsev yooj yim ntawm kev ntsuas cov ntaub ntawv. Tus nqi ntawm me ntsis tuaj yeem yog '0' lossis '1' (lossis 'true' lossis 'false'). Piv txwv li, los sawv cev rau tus lej lej 6 hauv binary, peb xav tau 3 khoom, raws li rau yog 110 hauv binary.
Tus nqi yog tus nqi ntawm cov khoom xa tawm hauv ib ob, uas yog hu ua cov khoom ib ob lossis bps. Txij li kev sib txuas lus niaj hnub tuaj yeem hloov pauv cov ntaub ntawv ntau hauv ib ob, peb pom cov nqi me ntsis hauv kbps, Mbps, lossis Gbps. Piv txwv li, 'Gigabit Ethernet' kev sib txuas tuaj yeem hloov 109 khoom ib ob.
Baud Rate
Hauv kev sib txuas lus, baud tus nqi yog tus lej ntawm cov cim xa mus. Cov cim muaj cov ntaub ntawv sib txawv hauv cov thev naus laus zis sib txawv.
Piv txwv li, hauv cov txheej txheem hu ua 64QAM, muaj 64 qib uas tuaj yeem sawv cev hauv ib lub cim. Txij li thaum 64=26, peb xav tau 6 khoom los sawv cev 64 qib ntawm 000000 (0) txog 111111 (63). Yog li ntawd, lub cim sawv cev rau ib qho ntawm 64 qib yog sib npaug rau sawv cev 6 khoom. Li no, hloov 1 lub cim yog sib npaug rau hloov 6 khoom. Yog li ntawd, nws tuaj yeem muab tau tias tus nqi qis=6 x baud tus nqi rau 64QAM.
Dab tsi yog qhov txawv ntawm tus nqi qis thiab baud tus nqi?
1. Tus nqi me ntsis yog tus nqi ntawm cov khoom hloov pauv hauv ib thib ob, qhov baud tus nqi yog tus nqi ntawm cov cim pauv hauv ib ob.
2. Ib me ntsis tuaj yeem sawv cev tsuas yog ob theem, thiab lub cim tuaj yeem sawv cev ob lossis ntau qib. Yog li ntawd, tus nqi me ntsis ib txwm ntau dua lossis sib npaug rau baud tus nqi.
3. Hauv feem ntau ntawm cov thev naus laus zis tam sim no, tus nqi me ntsis siab dua tus nqi baud.
