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Closed-circuit television (CCTV), also known as video surveillance is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. Even though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring.
DVR Means Digital Video Recorders. DVR records security footage that your CCTV security camera captures, allowing you to watch it back when you need to. This is paramount to site security. In the case of a security threat or criminal attack, a DVR system will ensure you’ve got security footage as proof, and it will also enable you to identify the assailant. In fact, businesses of all sizes should make a habit of regularly backing up their data, as it safeguards you in the event of physical damage or theft.
A DVR converts analog footage into a digital format, while an NVR typically only works with digital footage. DVR systems process data at the recorder, while NVR systems encode and process data at the camera before transmitting it to the recorder for storage and remote viewing.
Video on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then streamed to the NVR for storage or remote viewing, additional processing may be done at the NVR, such as further compression or tagging with meta data.