Intambo ye-coaxial (ngemuva kwalokhu ebizwa ngokuthi "i-coax") iyikhebula ehlanganisa amakhondatha amabili ensimbi eyi-coaxial kanye ne-insulated ukuze yakhe iyunithi eyisisekelo (i-coaxial pair), bese kuba ngamapheya angama-coaxial amaningi.Isetshenziswe isikhathi eside ukudlulisa idatha nezimpawu zevidiyo.Ingenye yemidiya yokuqala ukusekela i-10BASE2 kanye ne-10BASE5 Ethernet, futhi ingafinyelela ukudluliselwa kwe-10 Mb/s kwamamitha angu-185 noma amamitha angu-500 ngokulandelana.Igama elithi "coaxial" lisho ukuthi umqhubi omaphakathi wekhebula kanye nongqimba oluvikelayo kune-eksisi efanayo noma indawo emaphakathi.Amanye amakhebuli angama-coaxial angase abe nezendlalelo eziningi ezivikelayo, njengezintambo ezinezivikelo eziqinile ezinezivikelo eziqinile.Ikhebula liqukethe izendlalelo ezimbili zokuvikela, futhi ungqimba ngalunye lwesivikelo lwakhiwe nge-aluminium foil esongwe nge-wire mesh.Lesi sici esivikelayo sekhebula le-coaxial siyenza ibe nekhono eliqinile lokuphazanyiswa yi-anti-electromagnetic futhi ingadlulisela amasignali amaza aphezulu ebangeni elide.Kunezinhlobo eziningi ezahlukene zezintambo ze-coaxial ezisekela uhla olubanzi lwezicelo zobungcweti, njengokuxhumana ngesathelayithi, izicelo zezimboni, ezempi nezasolwandle.Izinhlobo ezintathu ezijwayeleke kakhulu zezintambo ezingezona ezezimboni yi-RG6, RG11 kanye ne-RG59, i-RG6 yazo esetshenziswa kakhulu ezinhlelweni ze-CCTV ne-CATV ezindaweni zamabhizinisi.I-conductor emaphakathi ye-RG11 ijiyile kune-RG6, okusho ukuthi ukulahlekelwa kokufakwa kwayo kuphansi futhi nebanga lokudlulisela isignali nalo lide.Kodwa-ke, ikhebula eliwugqinsi le-RG11 libiza kakhulu futhi aliguquki kakhulu, okuyenza ingakufanelekeli ukuthunyelwa ezinhlelweni zangaphakathi, kodwa ifaneleke kakhulu ukufakwa kwangaphandle okude noma izixhumanisi zomgogodla oqondile.Ukuvumelana nezimo kwe-RG59 kungcono kunaleyo ye-RG6, kodwa ukulahlekelwa kwayo kuphezulu, futhi ayivamisile ukusetshenziswa kwezinye izinhlelo zokusebenza ngaphandle komkhawulokudonsa ophansi, izinhlelo zokusebenza zevidiyo ye-analogi ephansi (amakhamera abuka ngemuva ezimotweni) anebanga elifushane futhi anomkhawulo. isikhala slot.I-impedance yezintambo ze-coaxial nazo ziyahlukahluka - ngokuvamile 50, 75, kanye no-93 Ω.Intambo ye-coaxial engu-50 Ω inamandla aphezulu okucubungula futhi isetshenziselwa ikakhulukazi izidluliseli zomsakazo, ezifana nemishini yomsakazo wenganekwane, i-civil band radio (CB) kanye ne-walkie-talkie.Ikhebula elingu-75 Ω lingakwazi ukugcina amandla esignali kangcono futhi lisetshenziselwa ngokuyinhloko ukuxhuma izinhlobo ezahlukene zezinto zokwamukela, njengezimukeli zikamabonakude wekhebula (CATV), amasethi kamabonakude anencazelo ephezulu neziqopha zevidiyo zedijithali.Intambo engu-93 Ω coaxial yasetshenziswa kunethiwekhi ye-IBM mainframe ngeminyaka yawo-1970s nasekuqaleni kwawo-1980, ngezinhlelo zokusebenza ezimbalwa kakhulu futhi ezibizayo.Nakuba i-75 Ω i-impedance yekhebula le-coaxial ivame ukuhlangatshezwana nayo ezinhlelweni eziningi namuhla, kufanele kuqashelwe ukuthi zonke izingxenye zesistimu yekhebula le-coaxial kufanele zibe nokuvinjwa okufanayo ukuze kugwenywe ukubonakala kwangaphakathi endaweni yokuxhuma okungase kubangele ukulahleka kwesignali futhi kunciphise ikhwalithi yevidiyo.Isignali yedijithali engu-3 (DS3) esetshenziselwa isevisi yokudlulisa yehhovisi elimaphakathi (eyaziwa nangokuthi umugqa we-T3) iphinde isebenzise izintambo ze-coaxial, okufaka phakathi u-75 Ω 735 no-734. Ibanga lokumboza lekhebula elingu-735 lifika kumamitha angu-69, kuyilapho lokho yekhebula engu-734 ifinyelela kumamitha ayi-137.Ikhebula le-RG6 lingasetshenziswa futhi ukudlulisa amasiginali e-DS3, kodwa ibanga lokuvala lifushane.
Idizayini ye-DB inamasethi agcwele ekhebula le-coaxial kanye nokuhlanganisa, okungasiza ikhasimende ukuthi lihlanganise isistimu yalo.Sicela uchofoze isixhumanisi esingezansi ukuze ukhethe imikhiqizo.Ithimba lethu labadayisi lihlezi likhona ngenxa yakho.
Isikhathi sokuthumela: Jan-17-2023