{"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\/pt\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-9-golovnaya-stantsiya","title":{"rendered":"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/e2ecba3816d8e6d1e6b4a29c70d864e1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA esta\u00e7\u00e3o principal coleta sinais de v\u00e1rias fontes, processa-os e transmite para a rede a cabo.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Conte\u00fado da s\u00e9rie de artigos<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Parte 1: Arquitetura geral da rede de televis\u00e3o por cabo<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Parte 2: Composi\u00e7\u00e3o e forma do sinal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Parte 3: Componente anal\u00f3gica do sinal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Parte 4: Componente digital do sinal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Parte 5: Rede de distribui\u00e7\u00e3o coaxial<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Parte 6: Amplificadores de sinal RF<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">Parte 7: Receptores \u00f3pticos<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">Parte 8: Rede de backbone \u00f3ptica<\/a><\/noindex><\/li>\n<li>Parte 9: Esta\u00e7\u00e3o cabe\u00e7a<\/li>\n<li>Parte 10: Diagn\u00f3stico e resolu\u00e7\u00e3o de falhas na rede de televis\u00e3o por cabo<\/li>\n<\/ul>\n<p>\nJ\u00e1 existe um \u00f3timo artigo no Habr sobre como funciona a esta\u00e7\u00e3o principal: <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/165643\/\">O que h\u00e1 dentro da esta\u00e7\u00e3o principal de televis\u00e3o a cabo<\/a><\/noindex>. N\u00e3o vou reescrever com minhas palavras e simplesmente recomendo que aqueles interessados leiam. A descri\u00e7\u00e3o do que est\u00e1 sob minha supervis\u00e3o seria menos interessante, pois n\u00e3o temos essa variedade de equipamentos, e todo o processamento dos sinais \u00e9 feito por chassi AppearTV com v\u00e1rios cart\u00f5es de expans\u00e3o, cuja diversidade permite acomodar todas as funcionalidades em poucos chassi de quatro unidades.<\/p>\n<p><img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/d3ab4fefde30a84e8e802842b8f9f8ef.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/19e9cdaa190310cb7aac5d37434b3550.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imagem do site <noindex><a rel=\"nofollow\" href=\"https:\/\/deps.ua\/katalog\/ip-strimeryi\/appear-tv-xc5000-5100.html\">deps.ua<\/a><\/noindex><\/i><\/p>\n<p>Esses dispositivos permitem controlar todos os processos por meio de uma interface web funcional, que depende do hardware do chassi.<br \/>\n<img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/7badb1d32aad8d76825aa8ca6ed91fc4.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAl\u00e9m disso, n\u00e3o coletamos o sinal de transmiss\u00e3o, portanto, o nosso posto de antena se parece com isso:<br \/>\n<img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/c01c936af6ece5a16f60f3f4321bcc7a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imagem do f\u00f3rum <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chipmaker.ru\/topic\/178360\/?do=findComment&amp;comment=3719772\">chipmaker.ru<\/a><\/noindex> n\u00e3o me foi permitido divulgar foto real da nossa esta\u00e7\u00e3o.<\/i><\/p>\n<p>Essa quantidade de antenas \u00e9 necess\u00e1ria para receber canais de v\u00e1rios sat\u00e9lites ao mesmo tempo.<\/p>\n<p>O sinal de sat\u00e9lite geralmente \u00e9 protegido por criptografia: \u00e9 um tipo de codifica\u00e7\u00e3o onde os s\u00edmbolos da sequ\u00eancia s\u00e3o embaralhados de acordo com um algoritmo definido. Isso n\u00e3o requer grande poder computacional e tempo para ser executado, portanto, o sinal \u00e9 processado sem atraso. Na vers\u00e3o hardware, o identificador do assinante (mesmo que este seja um provedor repassando o sinal para sua rede) \u00e9 o conhecido cart\u00e3o com chip, que \u00e9 inserido em um m\u00f3dulo de acesso condicional (CAM) com interface CI, igual ao de qualquer televis\u00e3o moderna.<br \/>\n<img decoding=\"async\" alt=\"Redes de TV a cabo para os mais pequenos. Parte 9: Esta\u00e7\u00e3o central\" src=\"\/wp-content\/uploads\/2019\/06\/5d54790c4165b47f783ee1457a2baabc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNa verdade, dentro do m\u00f3dulo \u00e9 onde toda a matem\u00e1tica \u00e9 realizada, e o cart\u00e3o cont\u00e9m um conjunto de chaves. O operador pode criptografar o fluxo com as chaves que o cart\u00e3o conhece (e que o pr\u00f3prio operador gravou no cart\u00e3o) e, assim, gerenciar o conjunto de assinaturas at\u00e9 a completa desconex\u00e3o do cart\u00e3o do sistema, alterando o identificador 'operacional' principal. Esta \u00e9 apenas uma descri\u00e7\u00e3o geral do funcionamento dos sistemas de acesso condicional; na verdade, existem muitos tipos diferentes: por um lado, eles est\u00e3o sempre sendo hackeados, e por outro, os algoritmos est\u00e3o sendo complicados, mas isso j\u00e1 \u00e9 uma hist\u00f3ria completamente diferente...<\/p>\n<p>Como o operador tamb\u00e9m fornece pacotes de canais pagos em sua rede, \u00e9 necess\u00e1rio codific\u00e1-los antes de transmiti-los na rede. Essa tarefa \u00e9 realizada pelo equipamento de um provedor externo do sistema de acesso condicional, que oferece este servi\u00e7o ao operador. O equipamento instalado na esta\u00e7\u00e3o cabe\u00e7al garante o funcionamento do sistema de acesso condicional ao conte\u00fado: tanto a criptografia quanto o controle das chaves registradas nos smart cards.<\/p>\n<p>P.S. Ningu\u00e9m me ajudou com o artigo sobre DOCSIS, se algu\u00e9m tiver interesse \u2014 ficarei feliz, entre em contato.<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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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