676R 4K60 4:4:4 HDMI and RS–232 Receiver over Ultra–Reach MM/SM Fiber Optic676R is a highperformance HDMI fiber receiver for ultrareach extension of 4K@60Hz (4: 4: 4) HDMI signals. 676R receives the transmitted optical signal from a compatible transmitter and converts it to an HDMI and RS232 signals. 676R includes a multimode SFP+ transceiver, but can be used with any Kramer certified SFP+ transceiver, such as a singlemode SFP+ transceiver. High Performance Standard Fiber Extender HDMI fiber receiver for providing ultrareach