Using the Datavideo VP - 633 is quite straightforward. First, connect the SDI cable to the repeater. Make sure to use a high - quality SDI cable to get the best performance. The included 12v DC PSU should be plugged in to power the repeater. You can use up to 4 repeaters in a chain (1 VP - 633 and 3 VP - 634) for longer distances, but remember that for 3G, the maximum distance between repeaters is 100m. If you need to extend the distance further, add unpowered VP - 634 repeaters, one for every additional 200m. When it comes to maintenance, keep the repeater in a clean and dry place. Avoid exposing it to extreme temperatures or moisture. Also, check the connections regularly to make sure they are secure.