{"id":34051,"date":"2019-10-31T21:56:10","date_gmt":"2019-10-31T18:56:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set\/"},"modified":"2019-10-31T21:56:10","modified_gmt":"2019-10-31T18:56:10","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","title":{"rendered":"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/4bc7a2511dcc5bb76581ddc03fff9f32.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEfter att ha g\u00e5tt igenom de teoretiska grunderna, g\u00e5r vi vidare till beskrivningen av den h\u00e5rdvarudel som anv\u00e4nds i kabel-TV-n\u00e4t. Jag b\u00f6rjar ber\u00e4ttelsen fr\u00e5n abonnentens mottagare och kommer att g\u00e5 mer i detalj \u00e4n i <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">f\u00f6rsta delen<\/a><\/noindex> jag kommer att ber\u00e4tta om alla komponenter i n\u00e4tverket.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Inneh\u00e5ll i artikelserien<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Del 1: Allm\u00e4n arkitektur f\u00f6r KTV-n\u00e4tet<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Del 2: Inneh\u00e5ll och form av signalen<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Del 3: Analog komponent av signalen<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Del 4: Digital komponent av signalen<\/a><\/noindex><\/li>\n<li>Del 5: Koaxial distributionsn\u00e4t<\/li>\n<li>Del 6: RF-signal f\u00f6rst\u00e4rkare<\/li>\n<li>Del 7: Optiska mottagare<\/li>\n<li>Del 8: Optisk ryggradn\u00e4t<\/li>\n<li>Del 9: Huvudstation<\/li>\n<li>Del 10: Fels\u00f6kning inom KTV-n\u00e4t<\/li>\n<\/ul>\n<h1>Kablage<\/h1>\n<p>\nFj\u00e4rrkontrollen kopplas till en splitter inuti l\u00e4genheten, eller (om det bara finns en TV) till st\u00e5ngen i elsk\u00e5pet p\u00e5 trappan. Som bekant \u00e4r varje extra anslutning en potentiell felk\u00e4lla, s\u00e5 vid fels\u00f6kning b\u00f6r man uppm\u00e4rksamma varje koppling.<\/p>\n<p>Inuti l\u00e4genheten och fram till elsk\u00e5pet anv\u00e4nds vanligtvis den v\u00e4lk\u00e4nda koaxialkabeln av typ RG-6, som avslutas med enkla kontakter som vanligtvis har kontakt endast med sk\u00e4rmen, medan den centrala ledningen g\u00e5r in i enhetens eller adapterns kontakt \"som den \u00e4r\".<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/23ccaf1ad0b1209f3a9707a4e062c0fa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/995cd136708b021f9d9402d2e9e3347c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/137128c73e8f6c8068cabd4653216ea2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nF\u00f6r att dra huvudledningar anv\u00e4nds kabel RG-11, som har mindre d\u00e4mpning per l\u00e4ngdenhet och st\u00f6rre h\u00e5llbarhet. Det finns ocks\u00e5 en sj\u00e4lvb\u00e4rande version av denna kabel med en st\u00e5ltr\u00e5d i sk\u00e4rmen f\u00f6r installation av \"luftledningar\".<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/1a812cf4641a5d7ba3fb006713313f1b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDenna kabel \u00e4r tjockare och styvare, s\u00e5 f\u00f6r avslutning anv\u00e4nds mer avancerade kontakter: antingen liknande de mindre varianterna, pressade kontakter, eller industriniv\u00e5ers skruvanslutningar.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/05ffcf089b07695d53d29df53ec848cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAtt trycka p\u00e5 en kontakt p\u00e5 en s\u00e5dan kabel kan vara utmanande, och ofta uppst\u00e5r problem direkt efter installationen p\u00e5 grund av att standarden f\u00f6r avsk\u00e4rmningsl\u00e4ngd (6,3 mm f\u00f6r den centrala ledningen + 6,3 mm f\u00f6r sk\u00e4rmen) inte f\u00f6ljs, eller senare p\u00e5 grund av d\u00e5lig kontakt vid pressningen utan specialverktyg.<\/p>\n<h1>Avledare och f\u00f6rdelare<\/h1>\n<p>\nVid konstruktion av st\u00e5ngen anv\u00e4nds f\u00f6rdelare och avledare.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/5a06616f0df2571db776fd45b9a21f79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nInuti utg\u00f6r de en avkoppling av LC-kretsar f\u00f6r att anpassa v\u00e5gmotst\u00e5ndet hos utg\u00e5ngarna. Om man delar den koaxiala kabeln utan en s\u00e5dan enhet, bara genom att tvinnas, s\u00e5 kommer det minskade motst\u00e5ndet vid parallellkoppling av de olika uttagen inte att l\u00e5ta signalen passera helt, och en del av den kommer att reflekteras tillbaka in i huvudledningen, vilket leder till st\u00f6rningar och brus i signalen.<\/p>\n<p>Den grundl\u00e4ggande skillnaden mellan avgrenare och splitter ligger i existensen eller fr\u00e5nvaron av en linj\u00e4r utg\u00e5ng (OUT). F\u00f6rluster vid en s\u00e5dan utg\u00e5ng \u00e4r minimala och uppg\u00e5r till cirka 1\u20135 dB beroende p\u00e5 nomineringen. F\u00f6rlusterna p\u00e5 abonnemangsavgreningarna (TAP) ligger mellan 8 och 30 dB eller mer. Detta \u00e4r n\u00f6dv\u00e4ndigt f\u00f6r att s\u00e4kerst\u00e4lla en j\u00e4mn signalniv\u00e5 p\u00e5 abonnemangsavgreningarna vid olika niv\u00e5er i stammen. <br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/d6a5f823729a7f5cc0382cfb711498e7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/2ca65e3dab99545dd741f22195f55530.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nOm vi i b\u00f6rjan av risern har en signal med niv\u00e5n 105 dB\u00b5V, s\u00e5 f\u00f6r att ge abonnenten fr\u00e5n grenen de avsedda 75 dB\u00b5V, m\u00e5ste vi installera en splitter som d\u00e4mpar 30 dB. Och till den avl\u00e4gsna \u00e4nden kan signalniv\u00e5n n\u00e5 mindre \u00e4n 85 dB, i s\u00e5 fall \u00e4r det n\u00f6dv\u00e4ndigt att installera en splitter vars f\u00f6rluster p\u00e5 grenarna \u00e4r minimala och f\u00f6r 4-v\u00e4gs splittern uppg\u00e5r till 8 dB. Den nominella d\u00e4mpningen och antalet utg\u00e5ngar \u00e4r praktiskt taget kodade av tillverkarna i m\u00e4rkningen av enheten: p\u00e5 bilden ovan ser vi till exempel 620 \u2014 6 abonnemangsavgreningar, som d\u00e4mpar 20 dB vardera och en f\u00f6rgreningspunkt. Beteckningarna TAH och SAH \u00e4r inte allm\u00e4nt accepterade, men de f\u00f6rekommer mycket ofta och betyder d\u00e4rf\u00f6r avgrenare (tap) eller splittrar (split).<\/p>\n<p>F\u00f6r att minska skillnaden i signalniv\u00e5 mellan avsnitten av risern m\u00e5ste man p\u00e5 h\u00f6ghus dela upp den i flera delar med hj\u00e4lp av huvudavgrenare. Detta m\u00f6jligg\u00f6r en minskning av sortimentet av abonnemangsavgrenare och s\u00e4kerst\u00e4ller en signalniv\u00e5 s\u00e5 n\u00e4ra den \u00f6nskade niv\u00e5n som m\u00f6jligt p\u00e5 abonnemangsavgreningarna.<\/p>\n<p>I diagrammet till v\u00e4nster har jag visat ett exempel p\u00e5 en riser som byggs uppifr\u00e5n och ner och uppdelad i tre delar (\"pilastrar\"). I de 12 v\u00e5ningarna anv\u00e4nds endast 5 typer av abonnemangsavgrenare. Om det inte hade funnits en uppdelning skulle man ha beh\u00f6vt anv\u00e4nda 12 olika typer med ett steg p\u00e5 2\u20133 dB. Och f\u00f6r den avl\u00e4gsna \u00e4nden skulle vi f\u00f6rmodligen \u00f6verhuvudtaget inte kunna hitta en splitter, eftersom \u00e4ven en som har endast tv\u00e5 utg\u00e5ngar, en \"halva\", d\u00e4mpar 4 dB, och med ett st\u00f6rre antal utg\u00e5ngar kanske vi inte klarar av att h\u00e5lla oss inom budgeten f\u00f6r d\u00e4mpningen.<\/p>\n<p>I fall d\u00e4r distansmatning av utrustningen till\u00e4mpas i systemet (detta kommer jag definitivt att ber\u00e4tta om i kommande delar) ser huvudavgrenarna lite annorlunda ut:<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/183a9636228617f04d67ab80b7607a24.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/745dc8dfbae376f7be48d3baeee028ed.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTack vare det massiva chassit och den genomt\u00e4nkta konstruktionen s\u00e4kerst\u00e4lls den b\u00e4sta isoleringen b\u00e5de mellan de str\u00f6mf\u00f6rande delarna och yttre p\u00e5verkan, samt att den yttre milj\u00f6n skyddas fr\u00e5n den betydande str\u00f6m som kan ledas genom kabeln.<\/p>\n<h1>Skyddselement<\/h1>\n<p>\nF\u00f6r att skydda utrustningen fr\u00e5n m\u00f6jliga incidenter p\u00e5 kabeln samt abonnenterna fr\u00e5n fel p\u00e5 den aktiva utrustningen installeras isolatorer i b\u00f6rjan av st\u00e4llverken, vilka ger en galvanisk \u00e5tskiljning mellan huvudlinjen och distributionen.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/c163212a2fb7243055e7e843f50a17cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nF\u00f6r att undvika signalreflektioner fr\u00e5n osynkroniserade uttag (konstruktionen \u00e4r endast f\u00f6r genomg\u00e5ende avledningar, men det finns en risk f\u00f6r att abonnenternas skulle ha en v\u00e5gimpedans som skiljer sig fr\u00e5n den som kr\u00e4vs vid d\u00e5lig montering eller fel p\u00e5 splittern) b\u00f6r de blockeras med synkroniserade absorberande pluggar, som ofta ocks\u00e5 har funktionen \"hemlighet\" i fall d\u00e4r avtalen med boende \u00e4r individuella.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de minsta. Del 5: Koaxialf\u00f6rdelningsn\u00e4t\" src=\"\/wp-content\/uploads\/2019\/05\/c0a3199785bbc1d5a3d9509993df3faa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u0439\u0434\u044f\u0441\u044c \u043f\u043e \u0442\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043e\u0441\u043d\u043e\u0432\u0430\u043c, \u043f\u0435\u0440\u0435\u0439\u0434\u0451\u043c \u043a \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u044e \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u0441\u0435\u0442\u0435\u0439 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f. \u041d\u0430\u0447\u043d\u0443 \u0440\u0430\u0441\u0441\u043a\u0430\u0437 \u043e\u0442 \u0442\u0435\u043b\u0435\u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a\u0430 \u0430\u0431\u043e\u043d\u0435\u043d\u0442\u0430 \u0438, \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e, \u0447\u0435\u043c \u0432 \u043f\u0435\u0440\u0432\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u0432\u0441\u0435\u0445 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u0435\u0442\u0438. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u0427\u0430\u0441\u0442\u044c 1: \u041e\u0431\u0449\u0430\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0430 \u0441\u0435\u0442\u0438 \u041a\u0422\u0412 \u0427\u0430\u0441\u0442\u044c 2: \u0421\u043e\u0441\u0442\u0430\u0432 \u0438 \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 3: \u0410\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 4: \u0426\u0438\u0444\u0440\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25705,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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