Coaxial cable (tom qab no hu ua "coax") yog ib lub cable uas muaj ob lub coaxial thiab insulated cylindrical hlau conductors los tsim ib chav tsev (coaxial khub), thiab tom qab ntawd ib leeg lossis ntau coaxial khub.Nws tau siv los xa cov ntaub ntawv thiab cov teeb liab video rau lub sijhawm ntev.Nws yog ib qho ntawm thawj cov xov xwm txhawb nqa 10BASE2 thiab 10BASE5 Ethernet, thiab tuaj yeem ua tiav 10 Mb / s kis tau tus mob ntawm 185 meters lossis 500 meters raws.Lub sij hawm "coaxial" txhais tau hais tias lub hauv paus neeg xyuas pib ntawm lub cable thiab nws cov shielding txheej muaj tib axis los yog central point.Qee cov coaxial cables yuav muaj ntau txheej thaiv, xws li plaub-shielded coaxial cables.Lub cable muaj ob txheej tiv thaiv, thiab txhua txheej ntawm shielding yog tsim los ntawm txhuas ntawv ci qhwv nrog hlau mesh.Qhov kev tiv thaiv tus yam ntxwv ntawm coaxial cable ua rau nws muaj zog tiv thaiv hluav taws xob cuam tshuam muaj peev xwm thiab tuaj yeem xa cov teeb liab ntau zaus dhau mus ntev.Muaj ntau ntau hom coaxial cables uas txhawb nqa ntau yam kev siv, xws li kev sib txuas lus satellite, kev lag luam, kev ua tub rog thiab kev siv marine.Peb hom kab hluav taws xob feem ntau tsis yog kev lag luam coaxial yog RG6, RG11 thiab RG59, uas RG6 feem ntau siv hauv CCTV thiab CATV daim ntawv thov hauv kev lag luam ib puag ncig.Lub hauv paus tus neeg xyuas pib ntawm RG11 yog tuab dua RG6, uas txhais tau hais tias nws qhov kev nkag tsis tau qis dua thiab cov teeb liab kis tau tus mob ntev dua.Txawm li cas los xij, qhov tuab ntawm RG11 cable yog kim dua thiab hloov tau yooj yim, uas ua rau nws tsis haum rau kev xa mus rau hauv cov ntawv thov sab hauv, tab sis tsim nyog rau kev teeb tsa sab nraum zoov ntev lossis kev sib txuas ncaj nraim.Kev hloov pauv ntawm RG59 yog qhov zoo dua li ntawm RG6, tab sis nws qhov kev poob siab yog qhov siab, thiab nws tsis tshua siv rau lwm yam kev siv tshwj tsis yog rau cov bandwidth tsawg, tsawg zaus analog video daim ntawv thov (rov qab saib lub koob yees duab hauv tsheb) nrog luv luv thiab txwv. qhov chaw.Lub impedance ntawm coaxial cables kuj txawv - feem ntau 50, 75, thiab 93 Ω.50 Ω coaxial cable muaj lub zog ua haujlwm siab thiab feem ntau yog siv rau hauv xov tooj cua transmitters, xws li cov khoom siv hauv xov tooj cua, xov tooj cua pej xeem band (CB) thiab walkie-talkie.Lub 75 Ω cable tuaj yeem tswj tau lub teeb liab lub zog zoo dua thiab feem ntau yog siv los txuas ntau hom kev txais khoom, xws li cable TV (CATV) receivers, high-definition TV teeb thiab digital video recorders.93 Ω coaxial cable tau siv hauv IBM mainframe network hauv xyoo 1970s thiab thaum ntxov 1980s, nrog tsawg heev thiab kim daim ntawv thov.Txawm hais tias 75 Ω coaxial cable impedance feem ntau ntsib nyob rau hauv feem ntau daim ntawv thov niaj hnub no, nws yuav tsum tau muab sau tseg tias tag nrho cov Cheebtsam nyob rau hauv lub coaxial cable system yuav tsum muaj tib impedance kom tsis txhob muaj kev xav sab hauv ntawm qhov chaw txuas uas yuav ua rau lub teeb liab poob thiab txo cov video zoo.Cov teeb liab digital 3 (DS3) cov teeb liab siv rau kev pabcuam kev sib kis ntawm lub hauv paus chaw ua haujlwm (tseem hu ua T3 kab) kuj siv cov coaxial cables, suav nrog 75 Ω 735 thiab 734. Qhov kev pab cuam deb ntawm 735 cable yog txog 69 meters, thaum lub sijhawm ntawd. ntawm 734 cable yog mus txog 137 meters.RG6 cable kuj tseem siv tau los xa cov cim DS3, tab sis qhov kev pab cuam luv luv.
DB tsim muaj tag nrho cov txheej ntawm coaxial cable thiab sib dhos, uas tuaj yeem pab cov neeg siv khoom sib txuas lawv tus kheej.Thov nyem qhov txuas hauv qab no los xaiv cov khoom.Peb pab neeg muag khoom yog ib txwm nyob ntawm no rau koj.
Post lub sij hawm: Jan-17-2023