The Genlock input on 3Play’s backplate is for connection of a ‘house sync’ or reference signal (often a ‘black burst’ signal intended specifically for this purpose). Many studios use this method to synchronize equipment in the video chain. Genlocking is commonplace in higher-end production environments, and genlock connections are usually found on professional gear.
If your equipment allows you to do so, you should genlock 3Play and all cameras you configure as sources for it (see your camera manual for details). To do so, supply the reference signal from the ‘house sync generator’ to 3Play’s Genlock input connector.
For more information please download the entire document at http://new.tk/rt-m3p