Beijing Fibridge FSCRLE31-K02C QSFP56 200Gb/s FR4 2km DDM Optical Transceiver is compatible with FSCRLE31-K02C QSFP56 200Gb/s FR4 2km DDM Optical Transceiver. Its application includes 200GBASE-FR4 Ethernet, Switch & Router Connections, Data Center 200GE 2km SMF links and Other 200G Interconnect Requirements.