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action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/hqlevel/public_html/wp-includes/functions.php on line 6121Televiziunea prin cablu, sau CATV, este un sistem de difuzare programelor TV, radio FM, cu ajutorul semnalelor de radio-frecvenţă, transmise spre aparatele de recepţie prin intermediul unei reţele fixe realizată cu fibră optică oricu cablu coaxial. O retea CATV este formata dintr-un terminal principal siFDM ( frequency-division multiplexing), care este amplificat si distribuit de ctre reteau de calbu.
Din punct de vedere tehnic, o reţea CATV presupune distribuirea unui număr de canale de televiziune într-o locaţie , spre abonaţii unei comunităţi, prin intermediul unei reţele ramificate realizată cu fibre optice şi/sau cu cabluri coaxiale.
CATV a fost creat ca un mediu unidirecţional pentru transmiterea programelor TV unui numar maxim de abonati, la cel mai mic cost posibil. Difuzarea televiziunii analogice prin cablu este realizata printr-o transmisie de banda larga.
O retea CATV moderna este compusa din:
CCTV sau Closed-circuit television se refera la folosirea unor camere video ce transmit semnalul catre un loc specific intr-o circuit inchis, fara a permite accesul din exteriorul sistemului.