NVR IP CAMERA CCTV Installation
NVR is Network Video Recorder using IP cameras for network.NVR does not process video and all encoding and processing done by the IP camera itself.
Then the IP camera streams the video on network.
PoE Powe On Ethernet switches used to connect IP cameras , as NVR has got no video inputs. NVR with built in POE also available, but very costly and is for only small networks.