Coaxial cable yog ib hom kev sib txuas lus cable. Cov txheej txheem cable yog cov khoom siv tooj liab thiab txheej ntawm cov khoom siv ntxig ntxig. Qhov txheej txheej ntawm cov ntaub thaiv insulating yog puag ncig los ntawm cov ntaub ntom ntom ntom zoo, thiab lub vas yog them nrog txheej txheej ntawm cov khoom pov tseg. Ob hom kev siv dav hlau coaxial yog 50 ohm cables, uas tau siv rau cov xov tooj digital. Vim tias lawv feem ntau siv rau kev sib kis hauv xov hluav taws xob, lawv tseem hu ua baseband coaxial cables; lwm qhov yog 75 ohm cables, uas tau siv rau kev xa xov hluav taws xob. Coaxial cable tuaj yeem txhawb nqa txoj kab nrig dav dav thiab muaj cov yam ntxwv suab nrov zoo tshaj plaws, yog li nws tuaj yeem xa cov ntaub ntawv, lub suab thiab video tib lub sijhawm. Muaj ob hom coaxial cables hauv Ethernet network, ib qho yog tuab cable (Thicknet) thiab lwm qhov yog Thin cable
Coaxial cable (Coaxial) yog hais txog txoj hlua hluav taws xob uas muaj ob qho kev sib tshooj, thiab tus neeg xyuas pib thiab cov txheej txheem thaiv cov sib faib ua tib lub axis. Feem ntau cov coaxial cable muaj ib tus neeg xyuas tooj tooj cais los ntawm ib cov khoom siv insulating. Sab nraud ntawm cov khoom siv sab hauv insulating yog lwm txheej ntawm cov nplhaib neeg xyuas pib thiab nws cov rwb thaiv tsev, thiab tom qab ntawd tag nrho cov xov yog them los ntawm polyvinyl chloride lossis Teflon cov khoom siv hnab riam. Cov.
Tam sim no, muaj ob hom xov tooj feem ntau siv coaxial: 50Ω thiab 75Ω coaxial cable.
75Ω coaxial cable feem ntau siv hauv CATV network, yog li nws hu ua CATV cable, thiab nws kis tau tus kab mob tuaj yeem ncav cuag 1GHz. Tam sim no, cov kab xa xov xa tawm ntawm kev siv ntau ntawm CATV cable yog 750MHz.
50Ω coaxial cable yog tsuas yog siv rau lub teeb liab bandband, thiab cov kab xa xov hluav taws xob kis yog 1 ～ 2OMHz. Hom npav Ethernet siv 50Ω coaxial cable. Hauv Ethernet, qhov ntau kis tau ntev tshaj ntawm 50Ω nyias coaxial cable yog 185 meters. Cov cable tuaj yeem ncav cuag 1000 meters.
