Choosing CCTV Video Recorders
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The video recorder is where the video from your camera gets processed for storing & viewing.
Types of video recorders
DVR (Digital Video Recorder)
- DVRs work well with traditional analog cameras.
- The DVR processes analog videos into digital formats for recording and viewing.
NVR (Network Video Recorder)
- NVRs are best for using with modern IP (Internet Protocol) cameras.
- NVRs obtain video via digital signals from the cameras via a shared network.
Comparing DVR and NVR
|Cameras||Analog or coaxial cable based cameras||IP camera|
|Image Quality||Usually Lower - Available in 720p, 2MP (1080p)||Usually Higher - Available in 2MP, 4MP, 5MP and 12MP (4K)|
|Wiring||• Needs power cable as well as audio/video cable (Coaxial or Siamese cable)
• Each camera needs to be wired to the DVR
• Signal range limited to about 1000 ft.
|• Wireless or via Ethernet Cable
• Same wire for audio, video and power
• Signal over network, not limited by wiring
|Installation||Relatively complex||Relatively easy|
|Cost||Lower for DVR, high for wiring||Higher for NVR, low for wiring|
|Channels||Usually comes with 8, 16 or 36 channels||• Usually comes with 4, 8 or 16 channels
• Number of cameras supported may be more than channels, depending on network bandwidth and video specifications
|Scalability||Number of cameras is limited to available ports||• Easy to add more cameras
• More than one camera can be added to a single port using a POE (Power over Ethernet) switch
Go for a recorder with more ports than you currently require, in case you plan to scale. This would make it easier and cost-effective to add more cameras in the future. In this case, do make sure your recorder can be linked to more storage devices.