Here are some common terms specifically related to CCTV that you will hear used a lot! DVR - Digital Video Recorders, which is a recording device used with HD over COAX cameras. HD over COAX - COAX cable was used for analog cameras in the past, but today it is used to transmit a high-definition digital signal over the same cable to the DVR. *_Don't miss out – the offer ends tonight*_ To communicate: (Mobile number appears when you press the contact button) / (Mobile number appears when you press the contact button)