Difference Between Analog, IP Camera And IP Edge
David Norton The difference between the three options of analog DVR, IP NVR and IP direct storage cameras are found in the manner of signal transmission and resolution. In a CCTV system the analog video is streamed from the camera to the DVR over a coax cable. The DVR converts the analog stream to a digital stream. The coax cable is a one way delivery system of the analog video to the DVR.
The key difference here is that an IP camera is capable of streaming a digital signal from the IP Camera to the NVR or Network Video Recorder. There is no need for any conversion to take place. The cable used in transferring the video stream with an IP camera is an ethernet cable. This type of cable allows for two way data communications to take place.
The popularity of IP cameras is from the capability of the camera to capture and deliver high resolution pictures. Producing a very high quality picture even when it is zoomed. The cameras also use existing network infrastructure.
Currently there is a turn away from CCTV analog systems to IP video systems and it is reflected the global camera sales. High resolution cameras are more popular demonstrated by the growth in sales. While low resolution analog cameras continue to decline.
What is interesting about the two systems is the streaming of video is done in two different ways but the topology is the same. Both the NVR and the DVR have a video management software system installed representing the core of both systems. This management area operates all of the key functions of the NVR or the DVR thus it is the center or nucleus of each system.
There is another IP technology called Edge technology available. In Edge Technology the video management takes place at the IP Camera. By placing the software at the camera it solves the need for processing and the central location is eliminated. Thus storing data on a Hard Drive, SD Card, Flash Drive, or Network Attached Storage at the cameras location.This means the camera actually packages the video as sequences just like an NVR and stores the sequences as ready to access files by any digital media.
There are many advantages to this for example you could connect an external Hard Disk Drive or a Network Attached Storage Device and begin storing terabytes of megapixel data without consuming any network bandwidth. Using a standard web browser such as internet explorer or a viewing client users on the network can send video sequence searches based upon camera locations, event type, time and date directly from where the video is stored at the cameras location. Then play them back play them back directly from the storage media. The only time bandwidth is consumed is when a query is requested by a user.
It would be impossible to do this with an NVR or DVR because the video would have to be processed here at these locations first. When all data streams have to pass through an NVR it is a bottleneck waiting to happen. This can cause network and server overload especially when you have multiple cameras working simultaneously recording high definition video.