Kramer Electronics 611R 611T and 611R are a high performance fiber optic transmitter and receiver for composite video signals. The 611T transmitter converts a composite video signal into a fiber optic signal and the 611T receiver will convert the fiber optic signal back into a composite video signal. Bandwidth - 55MHz (-3dB). Level (Gain) and EQ (Peaking) Controls (611T and 611R). Multi-Mode - 5km (3.1 miles). Compact Kramer TOOLS - 3 units can be rack mounted side-by-side in a 1U rack space with the optional RK-3T rack.