l Compliant with 100GBASE-LR4 l Support line rates from 103. 81 Gbps l Integrated LAN WDM TOSA / ROSA for up to 10 km reach over SMF l Digital Diagnostics Monitoring Interface l Duplex LC optical receptacle l No external reference clock l Single 3. 3 V power . The QSFP28 LR4 is a hot-pluggable, four-channel, and full-duplex optical transceiver module designed for long-distance transmission up to 10 km in the 100G Ethernet network with a working bandwidth of 1295nm to 1310nm. It is widely used in data centers, enterprise core networks, and telecom. FS offers a growing portfolio of 100G QSFP28 modules. The 100G QSFP28 module solution provides high-performance 100GbE connectivity for data centres, enterprise core & distribution layers, computing networks and service provider applications.