{"id":35405,"date":"2019-10-31T22:04:08","date_gmt":"2019-10-31T19:04:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-9-golovnaya-stantsiya\/"},"modified":"2019-10-31T22:04:08","modified_gmt":"2019-10-31T19:04:08","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-9-golovnaya-stantsiya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-9-golovnaya-stantsiya","title":{"rendered":"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/e2ecba3816d8e6d1e6b4a29c70d864e1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nHuvudstationen samlar signaler fr\u00e5n flera k\u00e4llor, bearbetar dem och s\u00e4nder ut dem i kabeln\u00e4tet.<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><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Del 5: Koaxial distributionsn\u00e4t<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Del 6: RF-signal f\u00f6rst\u00e4rkare<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">Del 7: Optiska mottagare<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">Del 8: Optisk ryggradn\u00e4t<\/a><\/noindex><\/li>\n<li>Del 9: Huvudstation<\/li>\n<li>Del 10: Fels\u00f6kning inom KTV-n\u00e4t<\/li>\n<\/ul>\n<p>\nDet finns redan en fantastisk artikel p\u00e5 Habr om hur en huvudstation fungerar: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/165643\/\">Vad som finns inuti en kabel-TV huvudstation<\/a><\/noindex>. Jag kommer inte att skriva om den med mina egna ord utan rekommendera de intresserade att l\u00e4sa den. Beskrivningen av vad jag har under min \u00f6vervakning skulle bli mindre intressant, eftersom vi inte har s\u00e5 stor variation i utrustningen, och all signalbehandling sk\u00f6ts av AppearTV-chassin med olika expansionskort, vars m\u00e5ngfald g\u00f6r att all funktionalitet f\u00e5r plats i n\u00e5gra fyrh\u00f6ga chassin.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/d3ab4fefde30a84e8e802842b8f9f8ef.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/19e9cdaa190310cb7aac5d37434b3550.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Bild fr\u00e5n webbplatsen <noindex><a rel=\"nofollow\" href=\"https:\/\/deps.ua\/katalog\/ip-strimeryi\/appear-tv-xc5000-5100.html\">deps.ua<\/a><\/noindex><\/i><\/p>\n<p>Dessa enheter m\u00f6jligg\u00f6r kontroll av alla processer genom ett funktionellt webbgr\u00e4nssnitt som beror p\u00e5 den h\u00e5rdvarukonfiguration som chassit har.<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/7badb1d32aad8d76825aa8ca6ed91fc4.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDessutom samlar vi inte in signals\u00e4ndningar, s\u00e5 v\u00e5r antennpost ser ungef\u00e4r ut s\u00e5 h\u00e4r:<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/c01c936af6ece5a16f60f3f4321bcc7a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Bild fr\u00e5n forumet <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chipmaker.ru\/topic\/178360\/?do=findComment&amp;comment=3719772\">chipmaker.ru<\/a><\/noindex> jag fick inte tillst\u00e5nd att publicera verkliga bilder p\u00e5 v\u00e5r station.<\/i><\/p>\n<p>Detta antal paraboler \u00e4r n\u00f6dv\u00e4ndigt f\u00f6r att ta emot kanaler fr\u00e5n flera satelliter samtidigt.<\/p>\n<p>Satellitsignalen \u00e4r vanligtvis skyddad med skramblering: detta \u00e4r en typ av kryptering d\u00e4r symbolerna i sekvensen blandas enligt en given algoritm. Detta kr\u00e4ver inte mycket ber\u00e4kningskraft eller tid f\u00f6r att genomf\u00f6ra, vilket inneb\u00e4r att signalen behandlas utan dr\u00f6jsm\u00e5l. I h\u00e5rdvaran \u00e4r abonnentidentifieraren (\u00e4ven om det \u00e4r en leverant\u00f6r som skickar signalen vidare i sitt n\u00e4t) ett bekant kort med chip, vilket s\u00e4tts in i en Conditional Access Module (CAM) med CI-gr\u00e4nssnitt, precis som i any modern TV.<br \/>\n<img decoding=\"async\" alt=\"Kabel-TV-n\u00e4t f\u00f6r de allra minsta. Del 9: Huvudstation\" src=\"\/wp-content\/uploads\/2019\/06\/5d54790c4165b47f783ee1457a2baabc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEgentligen utf\u00f6rs all matematik inuti modulen, och kortet inneh\u00e5ller en upps\u00e4ttning nycklar. Operat\u00f6ren kan kryptera fl\u00f6det med nycklar som kortet k\u00e4nner till (och dessa har operat\u00f6ren sj\u00e4lv skrivit in i kortet) och p\u00e5 s\u00e5 s\u00e4tt hantera upps\u00e4ttningen av prenumerationer \u00e4nda till fullst\u00e4ndig avst\u00e4ngning av kortet fr\u00e5n systemet genom att \u00e4ndra den prim\u00e4ra \"operat\u00f6rs\" identifieraren. Detta \u00e4r bara en allm\u00e4n beskrivning av hur systemen f\u00f6r betingad \u00e5tkomst fungerar; det finns m\u00e5nga olika system: \u00e5 ena sidan blir de st\u00e4ndigt hackade, \u00e5 andra sidan g\u00f6rs algoritmerna mer komplexa, men det \u00e4r en helt annan historia\u2026<\/p>\n<p>Eftersom operat\u00f6ren i sitt n\u00e4tverk ocks\u00e5 tillhandah\u00e5ller betalda paket med kanaler, \u00e4r det n\u00f6dv\u00e4ndigt att koda dem innan de \u00f6verf\u00f6rs i n\u00e4tverket. Denna uppgift utf\u00f6rs av utrustning fr\u00e5n en tredje part som tillhandah\u00e5ller system f\u00f6r villkorlig \u00e5tkomst, vilket operat\u00f6ren erbjuder som en tj\u00e4nst. Utrustningen som \u00e4r installerad p\u00e5 huvudstationen s\u00e4kerst\u00e4ller att systemet f\u00f6r villkorlig \u00e5tkomst till inneh\u00e5ll fungerar: b\u00e5de kryptering och kontroll av nycklar som \u00e4r angivna i smartkort.<\/p>\n<p>P.S. Ingen har hj\u00e4lpt mig med artikeln om DOCSIS, om n\u00e5gon har lust \u2013 jag ser fram emot att h\u00f6ra fr\u00e5n er.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455858\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u043e\u043b\u043e\u0432\u043d\u0430\u044f \u0441\u0442\u0430\u043d\u0446\u0438\u044f \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u0442 \u0441\u0438\u0433\u043d\u0430\u043b\u044b \u0441 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u0442 \u0438\u0445 \u0438 \u0432\u0435\u0449\u0430\u0435\u0442 \u0432 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u0443\u044e \u0441\u0435\u0442\u044c. \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 5: \u041a\u043e\u0430\u043a\u0441\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0441\u0435\u0442\u044c \u0427\u0430\u0441\u0442\u044c 6: \u0423\u0441\u0438\u043b\u0438\u0442\u0435\u043b\u0438 RF-\u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 7: \u041e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a\u0438 \u0427\u0430\u0441\u0442\u044c 8: \u041e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26561,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35405","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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