{"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\/et\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","title":{"rendered":"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/4bc7a2511dcc5bb76581ddc03fff9f32.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00e4ies l\u00e4bi teoreetilised alused, liikume edasi kaabeltelevisiooni kohtade kirjeldamise juurde. Alustan jutustust abonendi vastuv\u00f5tjast ja, detailsemalt, kui <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">esimeses osas<\/a><\/noindex> r\u00e4\u00e4gin k\u00f5igist v\u00f5rgustiku komponentidest.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklite seeria sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: Kaabli-TV v\u00f5rgu \u00fcldine arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja vorm<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Signaali analoogne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Signaali digitaalne komponent<\/a><\/noindex><\/li>\n<li>Osa 5: Koaksiaalne jaotamisv\u00f5rk<\/li>\n<li>Osa 6: RF-signaali v\u00f5imendid<\/li>\n<li>Osa 7: Optilised vastuv\u00f5tjad<\/li>\n<li>Osa 8: Optiline peav\u00f5rk<\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rgete k\u00f5rvaldamine kaabli-TV v\u00f5rgus<\/li>\n<\/ul>\n<h1>Kaablid<\/h1>\n<p>\nTelevisiooni pesa on \u00fchendatud jaoturiga korteris v\u00f5i (kui televisioon on ainult \u00fcks) \u2013 jaotuskilbi p\u00f5hipaneeliga. Nagu teada, iga \u00fcleliigne \u00fchendus on potentsiaalne rike, seet\u00f5ttu tasub probleemide leidmise ajal igale sidumisele erilist t\u00e4helepanu p\u00f6\u00f6rata.<\/p>\n<p>Korteri sees ja jaotuskilbini kasutatakse tavaliselt h\u00e4sti tuntud koaksiaalkaablit RG-6, mis on varustatud lihtsate pistikutega, millel on tavaliselt kontakt ainult plekkiooniga, samas kui keskmine s\u00fcdamik siseneb seadme v\u00f5i adapteri pistikusse \"nagu on\".<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/23ccaf1ad0b1209f3a9707a4e062c0fa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/995cd136708b021f9d9402d2e9e3347c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/137128c73e8f6c8068cabd4653216ea2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMagistraalide paigaldamiseks kasutatakse RG-11 kaablit, millel on v\u00e4iksem kadude pikkus ja suurem tugevus. Samuti on olemas isetoetav versioon sellest kaablist, millel on terasest k\u00f6is plekkioonis, et paigaldada \"\u00f5huliinid\".<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/1a812cf4641a5d7ba3fb006713313f1b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee kaabel on paksem ja j\u00e4igem, seet\u00f5ttu kasutatakse otstes keerukamaid konektoreid: need on kas sarnased v\u00e4iksematele surunurkhandid v\u00f5i t\u00f6\u00f6stuslikule varustusele iseloomulikud keeratavad konstruktsioonid.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/05ffcf089b07695d53d29df53ec848cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSellise kaabli konektori survetamine v\u00f5ib olla keeruline ning sageli tekivad probleemid kohe p\u00e4rast paigaldamist, sest ei j\u00e4rgita standardit kahjustuste pikkusel (6,3 mm keskjuhe + 6,3 mm varjestus), v\u00f5i hiljem, halva kontakti t\u00f5ttu, kui surutakse ilma spetsiaalsete t\u00f6\u00f6riistadeta.<\/p>\n<h1>Haru- ja jaotusseadmed<\/h1>\n<p>\nStendide ehitamiseks kasutatakse jaotusseadmeid ja haru-seadmeid.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/5a06616f0df2571db776fd45b9a21f79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNende sees on LC-ahelatest eraldamine, et harmoniseerida v\u00e4ljundite laineimpedantsi. Kui koaksiaalset kaablit ilma sellise seadmeta jagada, vaid lihtsalt keerdudes, siis paralleelselt \u00fchendamisega v\u00e4henenud igas haru takistus ei lase signaalil t\u00e4ielikult l\u00e4bi minna ning osa sellest peegeldub tagasi peajoonde, mis p\u00f5hjustab h\u00e4ireid ja m\u00fcra signaalis.<\/p>\n<p>Oluline erinevus jaoturite ja jaotuste vahel seisneb lineaarse v\u00e4ljundi (OUT) olemasolus v\u00f5i puudumises. Sellise v\u00e4ljundi kaod on minimaalsed, ulatudes umbes 1-5 dB, olenevalt nimiv\u00e4\u00e4rtusest. Tarbijate harudes (TAP) on kadu 8 kuni 30 ja rohkem dB. See on vajalik, et tagada \u00fchtlane signaalitase tarbijate harudes erineva tasemega peavoolus. <br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/d6a5f823729a7f5cc0382cfb711498e7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/2ca65e3dab99545dd741f22195f55530.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nKui r\u00f5hu alguses on meil signaal tasemega 105 dB\u03bcV, siis et anda tarbijale harust 75 dB\u03bcV, tuleb paigaldada jaotur, mis summutab 30 dB. Kaugemasse otsa v\u00f5ib peavoolus j\u00f5uda v\u00e4hem kui 85 dB, sel juhul tuleb paigaldada jaotur, mille kadud harudes on minimaalsed ja nelja v\u00e4ljundiga on need 8 dB. Kadu nimiv\u00e4\u00e4rtus ja v\u00e4ljundite arv on praktiliselt k\u00f5igil tootjatel kodeeritud seadme m\u00e4rgistuses: \u00fclaltoodud pildil n\u00e4eme n\u00e4iteks 620 \u2014 6 tarbijaharust, iga\u00fchel summutades 20 dB ning \u00fcks peavoolu v\u00e4ljund. TAH ja SAH t\u00e4hised ei ole \u00fcldiselt aktsepteeritud, kuid neid kohtab v\u00e4ga tihti ja need t\u00e4histavad vastavalt jaotureid (tap) v\u00f5i jaotureid (split).<\/p>\n<p>Signa tasandite erinevuse v\u00e4hendamiseks k\u00f5rghoonetes tuleb sellele jaotada mitmeks osaks peav\u00f5rgu harude abil. See v\u00f5imaldab v\u00e4hendada tellijate harude arvu ja tagada v\u00f5imalikult l\u00e4hedase taseme tellija harul.<\/p>\n<p>Vasakpoolsel skeemil n\u00e4itan n\u00e4idet vertikaalsest torustikust, mis on jagatud kolmeks osaks ('pilastrid'). 12-korruseliste jaoturite puhul kasutatakse vaid 5 erinevat tellijate haru. Kui jaotust ei oleks, tuleks kasutada 12 t\u00fc\u00fcpi sammu 2-3 dB. Ja kaugemas otsas ei suudaks me t\u00f5en\u00e4oliselt isegi jaoturit valida, kuna isegi vaid kahe v\u00e4ljundiga 'poolik' summutab 4 dB ning suurema v\u00e4ljundite arvu korral ei pruugi me mahtuda kadu eelarvesse.<\/p>\n<p>Juhul, kui s\u00fcsteemis kasutatakse seadmete kaugtoitmist (mille kohta r\u00e4\u00e4gin kindlasti j\u00e4rgmistes osades), n\u00e4evad peav\u00f5rgu harud v\u00e4lja natuke teistsugused:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/183a9636228617f04d67ab80b7607a24.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/745dc8dfbae376f7be48d3baeee028ed.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMassiivse korpuse ja l\u00e4bim\u00f5eldud konstruktsiooniga tagatakse parem isolatsioon nii juhtivate osade kui ka v\u00e4listest m\u00f5judest, samuti v\u00e4list keskkonnast suure voolu, mis v\u00f5ib juhtmes liikuda.<\/p>\n<h1>Kaitseelemendid<\/h1>\n<p>\nSeadmete kaitsmiseks v\u00f5imalike kaabliprobleemide eest ning tellijate kaitsmiseks aktiivse seadme t\u00f5rgete eest paigaldatakse kinnituspunktide alguses isolatsioonid, mis tagavad galvanilise lahutuse peamistest jaotustest.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/c163212a2fb7243055e7e843f50a17cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSignaali peegeldumise v\u00e4ltimiseks mitte\u00fchtlastelt v\u00e4ljunditelt (ehituslikult on need ainult l\u00e4bivad hargned, kuid on t\u00f5en\u00e4osus, et halva kvaliteedi t\u00f5ttu kokku pandud v\u00f5i jaoturi defekti t\u00f5ttu v\u00f5ivad tellija v\u00e4ljunditel samuti olla ringvoolu takistus, mis ei vasta n\u00f5utavale) tasub need blokeerida vastavatesse neelavatesse pistikutesse, millel on sageli ka 'salajase' funktsioon, kui elanikud s\u00f5lmivad teenuste osutamiseks individuaalsed lepingud.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 5: Koaksiaalne jaotusv\u00f5rk\" src=\"\/wp-content\/uploads\/2019\/05\/c0a3199785bbc1d5a3d9509993df3faa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>Allikas: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta 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