691 4K60 4:2:0 HDMI MM/SM Fiber Optic Transmitter with USB, Ethernet, RS–232, IR & Stereo Audio Embedding over Ultra–Reach HDBaseT 2.0691 is a highperformance HDBaseT 2. 0 fiber transmitter for ultrareach extension of 4K60Hz (4: 2: 0) HDMI, USB, Ethernet, RS232, IR and stereo audio signals over either multimode or singlemode fiber optic. 691 converts all input signals to an HDBaseT 2. 0 signal that is transmitted over a fiber optic cable to a compatible receiver that converts it back to the HDMI, USB, Ethernet, RS232, IR and stereo audio signals. It extends video signals to up to