675R/T 4K60 4:4:4 HDMI Extender Kit over Ultra–Reach MM/SM Fiber Optic675R T is a highperformance HDMI fiber extender kit for ultrareach extension of 4K@60Hz (4: 4: 4) HDMI signals. 675T converts the HDMI input signal to an optical signal that is transmitted over a fiber optic cable to 675R, which converts it back to an HDMI signal. 675R T includes 2 multimode SFP+ transceivers, but can be used with any Kramer certified SFP+ transceiver, such as a singlemode SFP+ transceiver. High Performance Standard Fiber Extender Kit