Kramer Electronics OC-1N OC-1N is a high performance optical isolator for video or sync signals. It provides complete isolation between devices thus eliminating video hum, ground loops, and DC offsets which can degrade picture quality. Bandwidth - 20MHz (-3dB). Channels - 1. Opto-Isolator Circuitry - Extremely linear response and wide frequency range compared to traditional transformer based units. Level (Gain) and EQ (Peaking) Controls. Floating Ground Selection - Input. Desktop Size - Compact size. Two units can be rack mounted side-by-side in a 1U rack space with the optional RK-50RN adapter.