QUADS AND MULTIPLEXERS INFO Multiplexers are available with 4, 8, 9 or 16 video inputs. When using a multiplexer you are able to view your cameras any way you want and record while viewing. You can see each camera individually and multi cameras on the screen, in intervals. The playback, allows viewing the cameras in any form you like. A Quad allows you to view the cameras during playback in the same manner they were recorded.