What is the difference between DVR and NVR?

DVR (Digital Video Recorder) and NVR (Network Video Recorder) are two types of video recorders used in video surveillance systems. While both are designed to record and store surveillance footage, there are some key differences between them.

DVRs are an older technology that records analog video signals from cameras. They compress the video and store it on a hard drive. DVRs typically require a coaxial cable to connect to the cameras, and the number of cameras that can be connected is limited by the number of available inputs on the DVR.

NVRs, on the other hand, are a newer technology that records digital video signals from IP (Internet Protocol) cameras. They receive the video signals through a network cable and store the video on a hard drive. NVRs typically have a greater number of camera inputs, and they can be expanded by adding network switches to the network.

Here are some other key differences between DVR and NVR:

1. Video Quality: NVRs can record video at higher resolutions than DVRs. This is because IP cameras can transmit higher resolution video signals than analog cameras.

2. Remote Access: NVRs can be accessed remotely over the internet, while DVRs typically require a separate device, such as a multiplexer, to provide remote access.

3. Ease of Installation: NVRs are generally easier to install than DVRs, as they require less cabling and can be configured more easily.

4. Cost: NVRs are generally more expensive than DVRs, as they require higher-quality components to support the higher video resolution and network connectivity.

In summary, while both DVR and NVR are video recorders used in surveillance systems, NVRs are newer technology designed to record digital video signals from IP cameras, while DVRs record analog video signals from cameras. NVRs offer higher video resolution, remote access, ease of installation, and scalability, but they are generally more expensive than DVRs.