{"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\/sk\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","title":{"rendered":"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/4bc7a2511dcc5bb76581ddc03fff9f32.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPo prechode teoretick\u00fdmi z\u00e1kladmi sa presunieme k popisu hardv\u00e9rovej \u010dasti siet\u00ed k\u00e1blovej telev\u00edzie. Za\u010dnem rozpr\u00e1vanie od telev\u00edzneho prij\u00edma\u010da predplatite\u013ea a, podrobnej\u0161ie ne\u017e v <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">prvej \u010dasti<\/a><\/noindex> prerozpr\u00e1vam o v\u0161etk\u00fdch s\u00fa\u010dastiach siete.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Obsah s\u00e9rie \u010dl\u00e1nkov<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">\u010cas\u0165 1: V\u0161eobecn\u00e1 architekt\u00fara siete KTV<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">\u010cas\u0165 2: Zlo\u017eenie a tvar sign\u00e1lu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">\u010cas\u0165 3: Anal\u00f3gov\u00e1 zlo\u017eka sign\u00e1lu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">\u010cas\u0165 4: Digit\u00e1lna zlo\u017eka sign\u00e1lu<\/a><\/noindex><\/li>\n<li>\u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165<\/li>\n<li>\u010cas\u0165 6: RF zesil\u0148ova\u010de<\/li>\n<li>\u010cas\u0165 7: Optick\u00e9 prij\u00edma\u010de<\/li>\n<li>\u010cas\u0165 8: Optick\u00e1 magistr\u00e1lna sie\u0165<\/li>\n<li>\u010cas\u0165 9: Hlavn\u00e1 stanica<\/li>\n<li>\u010cas\u0165 10: H\u013eadanie a odstra\u0148ovanie por\u00fach v sieti KTV<\/li>\n<\/ul>\n<h1>K\u00e1ble<\/h1>\n<p>\nZ\u00e1suvka telev\u00edzora sa sp\u00e1ja s rozdelova\u010dom v byte, alebo (ak je telev\u00edzor len jeden) \u2014 so stojanom v skrinke na schodoch. Ako je zn\u00e1me, ka\u017ed\u00e9 zbyto\u010dn\u00e9 spojenie je potenci\u00e1lna porucha, preto pri h\u013eadan\u00ed probl\u00e9mov treba venova\u0165 pozornos\u0165 ka\u017ed\u00e9mu spojeniu.<\/p>\n<p>V byte a po dobu skrinky sa zvy\u010dajne kladie dobre zn\u00e1my koaxi\u00e1lny k\u00e1bel typu RG-6, ktor\u00fd sa ukon\u010duje nekomplikovan\u00fdmi konektormi, ktor\u00e9 maj\u00fa zvy\u010dajne kontakt len s opleten\u00edm, zatia\u013e \u010do centr\u00e1lna \u017eiv\u00e1 vedie do konektora zariadenia alebo adapt\u00e9ra \u201etak, ako je\u201c.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/23ccaf1ad0b1209f3a9707a4e062c0fa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/995cd136708b021f9d9402d2e9e3347c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/137128c73e8f6c8068cabd4653216ea2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNa pokl\u00e1dku hlavn\u00fdch tr\u00e1s sa pou\u017e\u00edva k\u00e1bel RG-11, ktor\u00fd m\u00e1 ni\u017e\u0161ie atenu\u00e1cie na d\u013a\u017eku a v\u00e4\u010d\u0161iu pevnos\u0165. Existuje aj samonosn\u00e1 varianta tak\u00e9ho k\u00e1bla so \u017eelezn\u00fdm lanom v opleten\u00ed na pokl\u00e1dku \u201evzdu\u0161iek\u201c.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/1a812cf4641a5d7ba3fb006713313f1b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTento k\u00e1bel je hrub\u0161\u00ed a rigidnej\u0161\u00ed, a preto sa na jeho ukon\u010denie pou\u017e\u00edvaj\u00fa zlo\u017eitej\u0161ie konektory: bu\u010f podobn\u00e9 t\u00fdm men\u0161\u00edm, lisovacie konektory, alebo vlastn\u00e9 priemyseln\u00e9mu vybaveniu zlo\u017een\u00e9 z\u00e1vitov\u00e9 kon\u0161trukcie.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/05ffcf089b07695d53d29df53ec848cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLisovanie konektora na takom k\u00e1bli m\u00f4\u017ee by\u0165 obtia\u017ene a probl\u00e9my sa \u010dasto objavuj\u00fa hne\u010f po mont\u00e1\u017ei kv\u00f4li nedodr\u017eaniu \u0161tandardu d\u013a\u017eky odizolovania (6,3 mm centr\u00e1lna \u017eiv\u00e1 + 6,3 mm opletenie), alebo nesk\u00f4r, kv\u00f4li zl\u00e9mu kontaktu pri lisovan\u00ed bez \u0161peci\u00e1lneho n\u00e1radia.<\/p>\n<h1>Odp\u00edna\u010de a rozdeli\u010de<\/h1>\n<p>\nPri budovan\u00ed stojanu sa pou\u017e\u00edvaj\u00fa rozdeli\u010de a odp\u00edna\u010de.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/5a06616f0df2571db776fd45b9a21f79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVo vn\u00fatri predstavuj\u00fa rozpojenie z LC-obvodov pre zos\u00faladenie vlnov\u00e9ho odporu v\u00fdstupov. Ak by sa koaxi\u00e1lny k\u00e1bel rozdelil bez tak\u00e9ho zariadenia, a len skrutkami, zn\u00ed\u017een\u00fd odpor ka\u017ed\u00e9ho z odvodov pri paralelnom pripojen\u00ed neumo\u017en\u00ed sign\u00e1lu plne prech\u00e1dza\u0165 a jeho \u010das\u0165 sa odraz\u00ed sp\u00e4\u0165 do hlavnej l\u00ednie, \u010do sp\u00f4sob\u00ed vznik ru\u0161enia a \u0161umu v sign\u00e1le.<\/p>\n<p>Hlavn\u00fd rozdiel medzi odbo\u010dova\u010dmi a rozde\u013eova\u010dmi spo\u010d\u00edva v pr\u00edtomnosti alebo nepr\u00edtomnosti line\u00e1rneho v\u00fdstupu (OUT). Straty na takomto v\u00fdstupe s\u00fa minim\u00e1lne a predstavuj\u00fa asi 1-5 dB v z\u00e1vislosti od nomin\u00e1lnej hodnoty. Pri odbo\u010dk\u00e1ch pre z\u00e1kazn\u00edkov (TAP) sa \u00fatlmy pohybuj\u00fa od 8 do 30 a viac dB. Je to potrebn\u00e9 na zabezpe\u010denie rovnak\u00e9ho \u00farovne sign\u00e1lu na z\u00e1kazn\u00edckych odbo\u010dk\u00e1ch pri r\u00f4znych \u00farovniach v hlavnej l\u00ednii. <br \/>\n<img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/d6a5f823729a7f5cc0382cfb711498e7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/2ca65e3dab99545dd741f22195f55530.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nAk na za\u010diatku st\u00fapa m\u00e1me sign\u00e1l s \u00farov\u0148ou 105 dBmV, aby sme dodali z\u00e1kazn\u00edkovi z odbo\u010dky po\u017eadovan\u00fdch 75 dBmV, je potrebn\u00e9 nain\u0161talova\u0165 rozde\u013eova\u010d, ktor\u00fd zni\u017euje 30 dB. A na \u010fal\u0161\u00ed koniec hlavnej l\u00ednii m\u00f4\u017ee dorazi\u0165 menej ako 85 dB, v takom pr\u00edpade je potrebn\u00e9 umiestni\u0165 rozde\u013eova\u010d, ktor\u00e9ho straty na odbo\u010dk\u00e1ch s\u00fa minim\u00e1lne a pre 4-v\u00fdstupov\u00fd vykazuj\u00fa 8 dB. Nomin\u00e1lna strata a po\u010det v\u00fdstupov s\u00fa prakticky u v\u0161etk\u00fdch v\u00fdrobcov zak\u00f3dovan\u00e9 v ozna\u010den\u00ed zariadenia: na obr\u00e1zku vy\u0161\u0161ie vid\u00edme napr\u00edklad 620 \u2014 6 z\u00e1kazn\u00edckych odbo\u010diek so stratou 20 dB ka\u017ed\u00e1 a jeden hlavn\u00fd. Ozna\u010denie TAH a SAH nie je be\u017ene pou\u017e\u00edvan\u00e9, ale \u010dasto sa vyskytuje a znamen\u00e1 odbo\u010dova\u010de (tap) alebo rozde\u013eova\u010de (split).<\/p>\n<p>Aby sme zn\u00ed\u017eili rozdiel v \u00farovni sign\u00e1lu medzi sekciami st\u00fapa, v vysokopodla\u017en\u00fdch budov\u00e1ch je potrebn\u00e9 rozde\u013eova\u0165 ho na nieko\u013eko \u010dast\u00ed pomocou hlavn\u00fdch odbo\u010dova\u010dov. To umo\u017e\u0148uje zn\u00ed\u017ei\u0165 po\u010det z\u00e1kazn\u00edckych odbo\u010dova\u010dov a zabezpe\u010di\u0165 maxim\u00e1lne bl\u00edzky po\u017eadovanej \u00farovni na z\u00e1kazn\u00edckej odbo\u010dke.<\/p>\n<p>Na sch\u00e9me v\u013eavo som uk\u00e1zal pr\u00edklad st\u00fapa, postaven\u00e9ho zdola nahor a rozdelen\u00e9ho na tri \u010dasti (\u201epilastre\u201c). Na 12 poschod\u00ed sa pou\u017e\u00edvaj\u00fa iba 5 druhov z\u00e1kazn\u00edckych odbo\u010dova\u010dov. Keby nebolo rozdelenia, museli by sme pou\u017ei\u0165 12 r\u00f4znych druhov s rozdielom 2-3 dB. A pre \u010fal\u0161\u00ed koniec by sme pravdepodobne ani nemohli vybra\u0165 rozde\u013eova\u010d, preto\u017ee aj odbo\u010dova\u010d so len dvoma v\u00fdstupmi (\u201epopolamka\u201c) zni\u017euje 4 dB a pri v\u00e4\u010d\u0161om po\u010dte v\u00fdstupov u\u017e nemus\u00edme splni\u0165 rozpo\u010det na \u00fatlm.<\/p>\n<p>V pr\u00edpade, \u017ee v syst\u00e9me sa pou\u017e\u00edva dia\u013ekov\u00e9 nap\u00e1janie zariadenia (o tom ur\u010dite poviem v \u010fal\u0161\u00edch \u010dastiach), vyzeraj\u00fa hlavn\u00e9 odbo\u010dova\u010de trochu inak:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/183a9636228617f04d67ab80b7607a24.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/745dc8dfbae376f7be48d3baeee028ed.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMas\u00edvny korpus a premyslen\u00e1 kon\u0161trukcia zais\u0165uj\u00fa najlep\u0161iu izol\u00e1ciu ako vodiv\u00fdch \u010dast\u00ed od vonkaj\u0161\u00edch vplyvov, tak aj vonkaj\u0161ieho prostredia od zna\u010dn\u00e9ho pr\u00fadu, ktor\u00fd m\u00f4\u017ee pr\u00fadi\u0165 k\u00e1blom.<\/p>\n<h1>Ochrann\u00e9 prvky<\/h1>\n<p>\nNa ochranu zariadenia pred mo\u017en\u00fdmi incidentmi na k\u00e1bli, ako aj pred poruchami akt\u00edvneho zariadenia, s\u00fa na za\u010diatku sto\u017eiarov in\u0161talovan\u00e9 izol\u00e1tory, ktor\u00e9 zabezpe\u010duj\u00fa galvanick\u00e9 oddelenie medzi hlavn\u00fdm a rozde\u013eovac\u00edm veden\u00edm.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/c163212a2fb7243055e7e843f50a17cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAby sa zabr\u00e1nilo odrazu sign\u00e1lu z nezhodn\u00fdch v\u00fdstupov (kon\u0161trukt\u00edvne s\u00fa to len priechodn\u00e9 odbo\u010dky, ale existuje pravdepodobnos\u0165, \u017ee pri nekvalitnej mont\u00e1\u017ei alebo defekte rozdvojky bud\u00fa ma\u0165 aj predplatite\u013esk\u00e9 pripojenia vlnov\u00fa impedanciu odli\u0161n\u00fa od po\u017eadovanej), mali by sa blokova\u0165 zos\u00faladite\u013en\u00fdmi absorb\u010dn\u00fdmi z\u00e1tkami, ktor\u00e9 \u010dasto plnia aj \u00falohu 'tajn\u00e9ho' k\u013e\u00fa\u010da v pr\u00edpade, \u017ee s obyvate\u013emi sa uzatv\u00e1raj\u00fa individu\u00e1lne zmluvy o poskytovan\u00ed slu\u017eieb.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1blov\u00e9 telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/c0a3199785bbc1d5a3d9509993df3faa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>Zdroj: <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: 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