The DSR4x1 provides dependable signal routing of four HD or SD SDI video signals, between 143Mbps and 1.5Gbps, to a selected output. There are four LED switches mounted on the front panel to select among the inputs. For remote control, there is an optional RS232 serial port that uses simple ASCII commands for input selection. The included serial control makes for a very economical remote-access SDI switcher. The DSR4x1 is housed in Burst Electronics standard aluminum and steel enclosures that can be either desktop- or rack-mounted in a 1U rail. Power is supplied by any 9-15 Vac/dc power source using a 2.1mm circular connector (5Vdc optional). The units are polarity immune – perfect for vehicular and portable applications.