The 1/4-Channel Ethernet + 1 Bidirectional 485 Network Optical Transceiver is a versatile device that transmits both Ethernet data and industrial control signals (RS485) over a single fiber optic cable. It effectively extends network connectivity and serial communication up to 20km, featuring 100M adaptive Ethernet ports and robust, noise-immune data transmission. Key functionalities include converting electrical signals to optical for long-distance, lossless travel and providing a dedicated channel for bidirectional RS485 communication, commonly used in SCADA systems. This solution is ideally applied in industrial automation, intelligent transportation systems, remote security monitoring, and any scenario requiring reliable combined data and control signal transmission over long ranges.