The sending card is a typical component in a synchronous system. This card is responsible for converting the input videosignal (HDMI/DVI) to a format that the screen can interpret. In most cases the output from these cards to the LED screen via a conventional CAT7/8 Network Cable . The sender Card takes video input and sends it over via ethernet to the receiver card . Sending data over ethernet allows the video source to run long distances to the LED wall.