691 is a high-performance HDBaseT 2.0 fiber transmitter for ultra-reach extension of 4K60Hz (4:2:0) HDMI, USB, Ethernet, RS-232, IR and stereo audio signals over either multi-mode or single-mode 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, RS-232, IR and stereo audio signals. It extends video signals to up to 33km (20.5 miles) over single-mode fiber at up to 4K at 60Hz (4:2:0) resolution. 691 includes a multimode OSP+ transceiver, but can be used with a single mode OSP+ transceiver and fiber as well.