Kramer Electronics 621T 621T and 621R are optical transmitter and receivers for DVI signals up to 1600x1200 at 60 Hz. The 621T converts a DVI signal into an optical signal and the 621R converts the optical signal back to DVI. Max Data Rate - 1.65 Gbps. HDCP Compliant. System Range - Up to 100 meters (320). Power Connect System - Only one unit in a system, the transmitter or receiver, needs to be connected to a power source. All the systems units must have Power Connect to use this feature. Cable - UTP (unshielded twisted pair) such as CAT 5 and Fiber optic with 4 simplex or 2 duplex LC Fiber connectors. Compact Kramer TOOLS - 3 units can be rack mounted side-by-side in a 1U rack space with the optional RK-3T rack.