{"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\/it\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-9-golovnaya-stantsiya","title":{"rendered":"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/e2ecba3816d8e6d1e6b4a29c70d864e1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLa stazione principale raccoglie segnali da pi\u00f9 fonti, li elabora e li trasmette alla rete cablata.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Contenuto della serie di articoli<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Parte 1: Architettura generale della rete via cavo<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Parte 2: Composizione e forma del segnale<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Parte 3: Componente analogica del segnale<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Parte 4: Componente digitale del segnale<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Parte 5: Rete di distribuzione coassiale<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Parte 6: Amplificatori di segnale RF<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">Parte 7: Ricevitori ottici<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">Parte 8: Rete ottica di backbone<\/a><\/noindex><\/li>\n<li>Parte 9: Stazione centrale<\/li>\n<li>Parte 10: Risoluzione dei problemi nella rete via cavo<\/li>\n<\/ul>\n<p>\nSu Habr \u00e8 gi\u00e0 presente un ottimo articolo sul funzionamento della stazione principale: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/165643\/\">Cosa c'\u00e8 dentro la stazione principale della televisione via cavo<\/a><\/noindex>. Non intendo riscriverla a parole mie e consiglio semplicemente di leggerla per chi \u00e8 interessato. La descrizione di ci\u00f2 che gestisco sarebbe meno interessante, poich\u00e9 non disponiamo della stessa variet\u00e0 di attrezzature, e tutto l'elaborazione dei segnali \u00e8 gestita dai chassis AppearTV con diverse schede di espansione, la cui diversit\u00e0 consente di raccogliere tutte le funzionalit\u00e0 in pochi chassis da quattro unit\u00e0.<\/p>\n<p><img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/d3ab4fefde30a84e8e802842b8f9f8ef.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/19e9cdaa190310cb7aac5d37434b3550.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Immagine dal sito <noindex><a rel=\"nofollow\" href=\"https:\/\/deps.ua\/katalog\/ip-strimeryi\/appear-tv-xc5000-5100.html\">deps.ua<\/a><\/noindex><\/i><\/p>\n<p>Questi dispositivi consentono di controllare tutti i processi tramite un'interfaccia web funzionale, che dipende dal riempimento hardware dello chassis.<br \/>\n<img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/7badb1d32aad8d76825aa8ca6ed91fc4.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nInoltre, non raccogliamo il segnale aereo, quindi il nostro palo dell'antenna appare pi\u00f9 o meno cos\u00ec:<br \/>\n<img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/c01c936af6ece5a16f60f3f4321bcc7a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Immagine dal forum <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chipmaker.ru\/topic\/178360\/?do=findComment&amp;comment=3719772\">chipmaker.ru<\/a><\/noindex> non mi \u00e8 stato permesso di pubblicare foto reali della nostra stazione.<\/i><\/p>\n<p>Tale numero di antenne \u00e8 necessario per ricevere canali da pi\u00f9 satelliti contemporaneamente.<\/p>\n<p>Il segnale satellitare \u00e8 solitamente protetto da scramblatura: un tipo di crittografia in cui i simboli di una sequenza vengono mescolati secondo un algoritmo specifico. Questo non richiede grande potenza di calcolo e tempo di esecuzione, il che significa che il segnale viene elaborato senza ritardi. Nell'hardware, l'identificatore dell'abbonato (anche se si tratta di un fornitore che trasmette ulteriormente il segnale nella propria rete) \u00e8 una carta con chip, comune a tutti, che si inserisce nel modulo di accesso condizionato (CAM) con interfaccia CI, proprio come in qualsiasi televisore moderno.<br \/>\n<img decoding=\"async\" alt=\"Reti di televisione via cavo per i pi\u00f9 piccoli. Parte 9: Stazione principale\" src=\"\/wp-content\/uploads\/2019\/06\/5d54790c4165b47f783ee1457a2baabc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAll'interno del modulo si svolge tutta la matematica, e la carta contiene un insieme di chiavi. L'operatore pu\u00f2 crittografare il flusso con le chiavi di cui la carta \u00e8 a conoscenza (e che sono state scritte nella carta dall'operatore stesso) e, in questo modo, gestire l'insieme degli abbonamenti fino a disabilitare completamente la carta dal sistema, cambiando l'identificatore principale \"operatori\". Questa \u00e8 solo una descrizione generale del funzionamento dei sistemi di accesso condizionato; in realt\u00e0 ce ne sono molti diversi: da un lato subiscono costantemente attacchi, mentre dall'altro i loro algoritmi vengono resi pi\u00f9 complessi, ma questa \u00e8 un'altra storia...<\/p>\n<p>Poich\u00e9 l'operatore offre pacchetti a pagamento anche nella propria rete, \u00e8 necessario codificarli prima della trasmissione in rete. Questo compito viene svolto da attrezzature di terze parti fornite dal sistema di accesso condizionato, che l'operatore offre come servizio. Le attrezzature installate nella stazione centrale assicurano il funzionamento del sistema di accesso condizionato ai contenuti: sia la crittografia che il controllo delle chiavi memorizzate nelle smart card.<\/p>\n<p>P.S. Nessuno mi ha aiutato con l'articolo su DOCSIS, se qualcuno \u00e8 interessato \u2014 sarei felice, scrivete.<br \/>\n<br \/>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u043e\u043b\u043e\u0432\u043d\u0430\u044f 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Parte 9: Stazione centrale | ProHoster","description":"La stazione centrale raccoglie segnali da pi\u00f9 fonti, li elabora e li trasmette nella rete via cavo. 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