The HD-3521 digital video transceiver for remote-controlled cameras such as goal cams, surveillance/homeland security, distance learning, houses of worship, surgical video and specialty cameras. The HD-3521 system has everything from the 3500 system minus the audio and intercom functions. For customers looking for the capability to remotely control a distant camera with or without a PTZ (pan-tilt-zoom) head, this is the system for you. The system transports full resolution, uncompressed 3G HDTV from the camera and has two data paths for camera control, PTZ control and other accessories such as rain wipers. Use the GPIO's or Tally to trigger an integrated tally light at the camera or for any of a number of other convenient purposes. The HD-3521 is the cost-effective way to operate remote camera whether on the roof or across town.