{"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\/cs\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","title":{"rendered":"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/4bc7a2511dcc5bb76581ddc03fff9f32.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPo prozkoum\u00e1n\u00ed teoretick\u00fdch z\u00e1klad\u016f se p\u0159esu\u0148me k popisu hardwarov\u00e9 \u010d\u00e1sti kabelov\u00fdch televizn\u00edch s\u00edt\u00ed. Za\u010dnu vypr\u00e1v\u011bt od p\u0159ij\u00edma\u010de p\u0159edplatitele a podrobn\u011bji ne\u017e v <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">prvn\u00ed \u010d\u00e1sti<\/a><\/noindex> v\u00e1m pov\u00edm o v\u0161ech slo\u017ek\u00e1ch s\u00edt\u011b.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Obsah s\u00e9rie \u010dl\u00e1nk\u016f<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">\u010c\u00e1st 1: Obecn\u00e1 architektura s\u00edt\u011b KTV<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">\u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">\u010c\u00e1st 3: Analogov\u00e1 slo\u017eka sign\u00e1lu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">\u010c\u00e1st 4: Digit\u00e1ln\u00ed slo\u017eka sign\u00e1lu<\/a><\/noindex><\/li>\n<li>\u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165<\/li>\n<li>\u010c\u00e1st 6: RF sign\u00e1ln\u00ed zesilova\u010de<\/li>\n<li>\u010c\u00e1st 7: Optick\u00e9 p\u0159ij\u00edma\u010de<\/li>\n<li>\u010c\u00e1st 8: Optick\u00e1 p\u00e1te\u0159n\u00ed s\u00ed\u0165<\/li>\n<li>\u010c\u00e1st 9: Hlavn\u00ed stanice<\/li>\n<li>\u010c\u00e1st 10: Diagnostika a \u0159e\u0161en\u00ed probl\u00e9m\u016f na KTV s\u00edti<\/li>\n<\/ul>\n<h1>Kabely<\/h1>\n<p>\nZ\u00e1suvka televizoru je p\u0159ipojena k rozd\u011blova\u010di uvnit\u0159 bytu, nebo (pokud je televizor pouze jeden) \u2014 k vertik\u00e1le ve sk\u0159\u00edni na schodi\u0161ti. Jak je zn\u00e1mo, ka\u017ed\u00e9 nadbyte\u010dn\u00e9 spojen\u00ed je potenci\u00e1ln\u00ed z\u00e1vadou, proto je p\u0159i hled\u00e1n\u00ed probl\u00e9m\u016f t\u0159eba v\u011bnovat pe\u010dlivou pozornost ka\u017ed\u00e9mu spojen\u00ed.<\/p>\n<p>Uvnit\u0159 bytu a a\u017e k rozvad\u011b\u010di se v\u011bt\u0161inou pokl\u00e1d\u00e1 dob\u0159e zn\u00e1m\u00fd koaxi\u00e1ln\u00ed kabel typu RG-6, kter\u00fd kon\u010d\u00ed jednoduch\u00fdmi konektory, je\u017e obvykle maj\u00ed kontakt pouze s opleten\u00edm, zat\u00edmco centr\u00e1ln\u00ed vodi\u010d vstupuje do konektoru za\u0159\u00edzen\u00ed nebo adapt\u00e9ru \u201ejak je\u201c.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/23ccaf1ad0b1209f3a9707a4e062c0fa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/995cd136708b021f9d9402d2e9e3347c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/137128c73e8f6c8068cabd4653216ea2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPro pokl\u00e1dku magistr\u00e1l se pou\u017e\u00edv\u00e1 kabel RG-11, kter\u00fd m\u00e1 men\u0161\u00ed \u00fatlum na d\u00e9lku a vy\u0161\u0161\u00ed pevnost. Existuje tak\u00e9 samonosn\u00e1 varianta tohoto kabelu se ocelov\u00fdm lanem v opleten\u00ed pro pokl\u00e1dku \u201evzduchem\u201c.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/1a812cf4641a5d7ba3fb006713313f1b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTento kabel je siln\u011bj\u0161\u00ed a tuh\u00fd, proto se pro koncovky u\u017e pou\u017e\u00edvaj\u00ed slo\u017eit\u011bj\u0161\u00ed konektory: bu\u010f podobn\u00e9 sv\u00fdm men\u0161\u00edm prot\u011bj\u0161k\u016fm krimpovac\u00ed konektory, nebo typick\u00e9 pro pr\u016fmyslov\u00e9 za\u0159\u00edzen\u00ed samostatn\u00e9 \u0161roubov\u00e9 konstrukce.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/05ffcf089b07695d53d29df53ec848cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKonektorov\u00e1n\u00ed takov\u00e9ho kabelu m\u016f\u017ee b\u00fdt obt\u00ed\u017en\u00e9 a \u010dasto probl\u00e9my vznikaj\u00ed ihned po mont\u00e1\u017ei v d\u016fsledku nedodr\u017een\u00ed standardu d\u00e9lky holen\u00ed (6,3mm centr\u00e1ln\u00ed vodi\u010d + 6,3mm opleten\u00ed), nebo pozd\u011bji, kv\u016fli \u0161patn\u00e9mu kontaktu p\u0159i krimpov\u00e1n\u00ed bez speci\u00e1ln\u00edho n\u00e1stroje.<\/p>\n<h1>Odbo\u010dova\u010de a rozbo\u010dova\u010de<\/h1>\n<p>\nP\u0159i stavb\u011b vertik\u00e1ln\u00edho veden\u00ed se pou\u017e\u00edvaj\u00ed rozbo\u010dova\u010de a odbo\u010dova\u010de.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/5a06616f0df2571db776fd45b9a21f79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUvnit\u0159 p\u0159edstavuj\u00ed odd\u011blen\u00ed z LC obvod\u016f pro p\u0159izp\u016fsoben\u00ed vlnov\u00e9ho odporu v\u00fdstup\u016f. Pokud se koaxi\u00e1ln\u00ed kabel rozd\u011bl\u00ed bez takov\u00e9ho za\u0159\u00edzen\u00ed, t\u0159eba jednodu\u0161e zkroucen\u00edm, pak sn\u00ed\u017een\u00e9 odpor ka\u017ed\u00e9ho z odvod\u016f p\u0159i paraleln\u00edm zapojen\u00ed neumo\u017en\u00ed sign\u00e1lu \u00fapln\u011b proj\u00edt a \u010d\u00e1st z n\u011bj se odraz\u00ed zp\u011bt do magistr\u00e1ly, co\u017e povede k v\u00fdskytu zpo\u017ed\u011bn\u00ed a \u0161umu v sign\u00e1lu.<\/p>\n<p>Hlavn\u00ed rozd\u00edl mezi odbo\u010dkami a rozbo\u010dova\u010di spo\u010d\u00edv\u00e1 v p\u0159\u00edtomnosti nebo nep\u0159\u00edtomnosti line\u00e1rn\u00edho v\u00fdstupu (OUT). Ztr\u00e1ty na takov\u00e9m v\u00fdstupu jsou minim\u00e1ln\u00ed a \u010din\u00ed p\u0159ibli\u017en\u011b 1-5 dB v z\u00e1vislosti na jmenovit\u00e9 hodnot\u011b. Na odb\u011brn\u00fdch odbo\u010dk\u00e1ch (TAP) dosahuj\u00ed \u00fatlumy od 8 do 30 a v\u00edce dB. To je nezbytn\u00e9 pro zaji\u0161t\u011bn\u00ed stejn\u00e9 \u00farovn\u011b sign\u00e1lu na odb\u011brn\u00fdch odbo\u010dk\u00e1ch p\u0159i r\u016fzn\u00fdch \u00farovn\u00edch na trase. <br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/d6a5f823729a7f5cc0382cfb711498e7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/2ca65e3dab99545dd741f22195f55530.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPokud na za\u010d\u00e1tku stojanu m\u00e1me sign\u00e1l s \u00farovn\u00ed 105 dBmV, pak abychom dodali odb\u011brateli z odbo\u010dky p\u0159edepsan\u00fdch 75 dBmV, je nutn\u00e9 nainstalovat rozbo\u010dova\u010d s \u00fatlumem 30 dB. A na dal\u0161\u00edm konci trasy m\u016f\u017ee b\u00fdt \u00farove\u0148 sign\u00e1lu ni\u017e\u0161\u00ed ne\u017e 85 dB, v takov\u00e9m p\u0159\u00edpad\u011b je nutn\u00e9 pou\u017e\u00edt rozbo\u010dova\u010d, jeho\u017e ztr\u00e1ty na odbo\u010dk\u00e1ch jsou minim\u00e1ln\u00ed a pro \u010dty\u0159v\u00fdstupov\u00fd \u010din\u00ed 8 dB. Jmenovit\u00e9 \u00fatlumy a po\u010det v\u00fdstup\u016f jsou u t\u00e9m\u011b\u0159 v\u0161ech v\u00fdrobc\u016f zak\u00f3dov\u00e1ny v ozna\u010den\u00ed za\u0159\u00edzen\u00ed: na obr\u00e1zku naho\u0159e vid\u00edme nap\u0159\u00edklad 620 \u2014 6 odb\u011brn\u00fdch odbo\u010dek s \u00fatlumem 20 dB ka\u017ed\u00e1 a jedno trasov\u00e9. Ozna\u010den\u00ed TAH a SAH nen\u00ed standardizovan\u00e9, p\u0159esto se \u010dasto vyskytuje a odpov\u00edd\u00e1 odbo\u010dk\u00e1m (tap) nebo rozbo\u010dova\u010d\u016fm (split).<\/p>\n<p>Aby se sn\u00ed\u017eil rozd\u00edl v \u00farovni sign\u00e1lu mezi \u010d\u00e1stmi stojanu, u vysok\u00fdch budov je nutn\u00e9 jej rozd\u011blit na n\u011bkolik \u010d\u00e1st\u00ed pomoc\u00ed trasov\u00fdch odbo\u010dek. To umo\u017e\u0148uje zkr\u00e1tit sortiment odb\u011brn\u00fdch odbo\u010dek a zajistit co nejbli\u017e\u0161\u00ed \u00farove\u0148 na odb\u011brn\u00e9 odbo\u010dce.<\/p>\n<p>Na sch\u00e9matu vlevo jsem uk\u00e1zal p\u0159\u00edklad stojanu postaven\u00e9ho shora dol\u016f, rozd\u011blen\u00e9ho na t\u0159i \u010d\u00e1sti (\u201epilastry\u201c). Na 12 podla\u017en\u00edch krabic\u00edch se pou\u017e\u00edv\u00e1 pouze 5 typ\u016f odb\u011brn\u00fdch odbo\u010dek. Kdyby nebylo d\u011blen\u00ed, bylo by nutn\u00e9 pou\u017e\u00edt 12 typ\u016f s krokem 2-3 dB. A pro dalek\u00fd konec bychom pravd\u011bpodobn\u011b v\u016fbec nena\u0161li rozbo\u010dova\u010d, proto\u017ee i dvouv\u00fdstupov\u00e1 \u201ep\u016flka\u201c ztr\u00e1c\u00ed 4 dB, a p\u0159i v\u011bt\u0161\u00edm po\u010dtu v\u00fdstup\u016f bychom se u\u017e nemuseli vej\u00edt do rozpo\u010dtu na \u00fatlum.<\/p>\n<p>V p\u0159\u00edpad\u011b, \u017ee se v syst\u00e9mu pou\u017e\u00edv\u00e1 vzd\u00e1len\u00e9 nap\u00e1jen\u00ed za\u0159\u00edzen\u00ed (o tom se ur\u010dit\u011b zm\u00edn\u00edm v dal\u0161\u00edch \u010d\u00e1stech), vypadaj\u00ed trasov\u00e9 odbo\u010dky pon\u011bkud jinak:<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/183a9636228617f04d67ab80b7607a24.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/745dc8dfbae376f7be48d3baeee028ed.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVzhledem k robustn\u00ed konstrukci a promy\u0161len\u00e9mu designu je zaji\u0161t\u011bna nejlep\u0161\u00ed izolace jak elektrick\u00fdch \u010d\u00e1st\u00ed od vn\u011bj\u0161\u00edho vlivu, tak i vn\u011bj\u0161\u00edho prost\u0159ed\u00ed od zna\u010dn\u00e9ho proudu, kter\u00fd m\u016f\u017ee proudit kabelem.<\/p>\n<h1>Ochrann\u00e9 prvky<\/h1>\n<p>\nAby bylo za\u0159\u00edzen\u00ed chr\u00e1n\u011bno p\u0159ed mo\u017en\u00fdmi incidenty na kabelu a tak\u00e9 aby se p\u0159edch\u00e1zelo poruch\u00e1m aktivn\u00edho za\u0159\u00edzen\u00ed, instaluj\u00ed se na za\u010d\u00e1tc\u00edch stoupa\u010dek izol\u00e1tory, kter\u00e9 zaji\u0161\u0165uj\u00ed galvanick\u00e9 odd\u011blen\u00ed mezi hlavn\u00edm veden\u00edm a distribu\u010dn\u00ed \u010d\u00e1st\u00ed.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165\" src=\"\/wp-content\/uploads\/2019\/05\/c163212a2fb7243055e7e843f50a17cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAby se vylou\u010dilo odra\u017een\u00ed sign\u00e1lu z nekoherentn\u00edch v\u00fdvod\u016f (konstruk\u010dn\u011b se jedn\u00e1 pouze o pr\u016fchoz\u00ed odbo\u010dky, ale existuje pravd\u011bpodobnost, \u017ee p\u0159i nekvalitn\u00edm sestaven\u00ed nebo vad\u011b rozbo\u010dova\u010de i abonenti budou m\u00edt vlnov\u00fd odpor odli\u0161n\u00fd od po\u017eadovan\u00e9ho), je dobr\u00e9 je blokovat koherentn\u00edmi pohlcuj\u00edc\u00edmi z\u00e1tkami, kter\u00e9 \u010dasto pln\u00ed tak\u00e9 funkci \u201ez\u00e1mku\u201c, v p\u0159\u00edpad\u011b, \u017ee se s obyvateli uzav\u00edraj\u00ed individu\u00e1ln\u00ed smlouvy na poskytov\u00e1n\u00ed slu\u017eeb.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\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 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\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 5.0.3 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/cs\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | 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