The resolution of an old traditional analog camera (CVBS) is measured in TV lines, which is nothing more than the number of vertical lines that appears on a monitor. The higher the number of lines, the higher the resolution.
Note in the picture below that there are lines on the monitor screen that make up the image, depending on the number of lines the camera can generate it is considered a higher resolution camera, although it is an old technology, we still find cameras with resolutions of 480, 540, 600 and 1000 TV lines, however I do not recommend the use of such cameras.
