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While this is fine for most security footage, you may lose out on some analytics applications, like tracking faces or license plates, because of the lower quality, which tends to be problematic for future use cases.Ĭon: Limited audio capabilities – Because audio transmission requires an RCA connection and DVR boxes have limited audio inputs, you are limited to the number of cameras that can capture audio.Ĭon: Lower coverage area – Because cameras must be placed within 300 feet of the DVR box, you are limited in the total coverage area of a single system.
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Some newer analog HD can provide up to 720p or 1080p video resolution, but these are less common. Because of the limited bandwidth of coax cables, most systems provide 4CIF resolution (704×480) at a frame rate of 7 to 15 fps at best.
However, if you already have coaxial cables installed, this can make DVR systems easier to set up.Ĭon: Lower-quality video – While analog camera and coax cable quality is constantly improving, DVR systems don’t provide the video quality or frame rates of NVR systems. There is also no option for wireless cameras. Pro: Camera interoperability – Whereas NVR systems often require you to have cameras made from the same brand, DVR systems allow you to have different types of analog security cameras, which can save you money if you need to replace a camera.Ĭon: Running cables – Running the coaxial and power cables is more challenging with a DVR system than with NVR systems, as the siamese cables are thicker and more rigid than ethernet cables. Therefore, the upfront costs of setting up a DVR are much lower.
Pro: Lower upfront cost – Because of their limited capabilities, the majority of analog CCTV cameras are more affordable than IP cameras, unless you’re aiming for a high-resolution analog camera. This encoding process allows the video to be viewed and stored. Optional: DVR recorder with AD encoder: Within the DVR recorder, there is an AD (analog-to-digital) encoder that converts the analog video signal into a digital signal. In general, it’s recommended that a camera is connected by fewer than 300 feet or 90 meters of cable, otherwise the video signal starts to degrade.
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However, the DVR has a limited number of audio ports, so only a limited number of cameras can record audio.Ĭoaxial cables are wider and more rigid than ethernet cables, which can make them more difficult to install in tight spaces. Standard coaxial cables don’t include audio, but there are variants with added RCA connections. Because coaxial cables don’t provide power, a second power cable is typically included within a single covering-known as a siamese cable. Although, analog cameras nowadays aren’t much cheaper than lower megapixel IP cameras.Ĭoaxial BNC cables: Each analog camera is connected to the DVR through a coaxial cable.
These cameras tend to have fewer features and transmit lower-quality video than IP cameras-however, for that reason, they are relatively more affordable. Because these cameras pass a raw video signal through to the recorder, there are fewer restrictions when it comes to mixing and matching analog cameras of different brands. You get to decide what you want.ĭVR systems are made of the following components:Īnalog cameras: DVR systems use analog security cameras, also known as CCTV cameras. The most important difference is mainly around the resolution, hence quality of video, you get from these 2 options.Īnalog has low resolution options, IP has very high resolution options. Here’s a summary of these key differences:įor further analysis on the difference between analog and IP video surveillance, check out this breakdown by Security Magazine. The processed stream is then transferred to the recorder via an ethernet cable. IP cameras process video directly from the camera itself. In an NVR system, video is captured with digital, or IP (Internet Protocol) cameras. The recorder processes the video into a digital format to be stored or accessed live. Because analog cameras are unable to process video at the source, they pass the raw video feed to the recorder via coaxial cables. In a DVR system, the camera stream is captured from analog cameras. The main difference between DVR and NVR systems is how they communicate and transmit video data. On the surface, both systems serve the same purpose: they capture video footage transmitted from the cameras and store that stream so you can play it back later. Digital video recorders (DVR) and network video recorders (NVR) are types of video recording systems used for security cameras.