The Hilink HL-QSFP28-100G-UD-20 provides 100GBase-BX throughput up to 20km over single-mode fiber (SMF) using a wavelength of 1290nm-TX/1310nm-RX via an LC connector. This hot-pluggable duplex transceiver converts 4 input channels of 25Gbps electrical data to 1 lane optical signal channel for 100Gb/s (PAM4) optical transmission.