PH-G series product is an industrial GE Genius data optical transceiver, communication rate is 153.6K, industrial terminal interface with single optical port/dual optical port chain network. Mounted on 35mm DIN rail, DC 9-30V power supply. PH-G221 supports one optical fiber interface, one data interface, PH-G222 supports two cascadable uplink and downlink optical fiber interfaces, and one data interface.