closed-circuit television

US /ˌkloʊzd ˌsɝː.kɪt ˈtel.ə.vɪʒ.ən/
UK /ˌkloʊzd ˌsɝː.kɪt ˈtel.ə.vɪʒ.ən/
"closed-circuit television" picture
1.

télévision en circuit fermé, vidéosurveillance

a television system in which the signal is not publicly broadcast but is distributed to a limited number of receivers, used for surveillance and security purposes

:
The bank uses closed-circuit television to monitor its premises 24/7.
La banque utilise la télévision en circuit fermé pour surveiller ses locaux 24h/24 et 7j/7.
Security cameras are part of a larger closed-circuit television system.
Les caméras de sécurité font partie d’un système de télévision en circuit fermé plus vaste.