Analog DVR
    In the traditional analog CCTV application, security cameras capture an analog video signal and transfer that
    signal over coax cable (or Cat 5 with Baluns) to the Digital Video Recorder (DVR).
    Each camera may be powered by plugging in the power supply right at the camera or by using RG59 Siamese
    cable which bundles the video and the power cables.
    At the DVR, the images are converted from an analog signal into a digital format to be stored on a hard drive.  
    This is the most important part of the chain.  The greatest most powerful camera will not be effective if the image
    is compressed down to nothing by the DVR.  The two most popular DVR resolution types are CIF and D1.  CIF
    is defined as 320×240 pixels and D1 is 720×480.  As you can tell, D1 is 4 times larger than CIF.  That means
    that the raw analog signal of the camera will be compressed less, giving you better detail.

    Intelligence is built into the DVR to handle such things as scheduling, motion detection, and digital zoom.
    Monitors for viewing the video are connected to the DVR, or it can be set up to publish over an internal network
    for viewing on PCs.

    The DVR can also be set up to broadcast over the Internet and can add password protection and other features.
    When broadcasting over the Internet, the video for all of the cameras is transmitted as one stream (one IP
    address). Therefore, it is very efficient.
 
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