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. This comprehensive guide explores the. QSFP28 LR4 is a crucial technology for delivering reliable, long-distance 100G connectivity in enterprise and data center networks. The market is complex, and choosing the right module that meets your cost, performance, and compatibility needs is difficult. 3ba standard for 100G Ethernet. Unlike the QSFP28 SR4, it adopts Wavelength Division Multiplexing (WDM) technology, which multiplexes optical signals of different wavelengths from 4 channels onto a single fiber for transmission. This guide provides a comprehensive breakdown of 100G QSFP28 transceiver types, highlighting their key technical.