This 400G QSFP112 LR4 transceiver is a high-performance pluggable optical module optimized for 10km long-reach single-mode fiber transmission, ideal for data centers, enterprise backbones and 5G fronthaul/backhaul networks. Based on 4×100G PAM4 modulation technology and operating at 1295~1309nm C-band wavelengths, it delivers 400Gbps full-duplex data transmission, complying with IEEE 802.3cu and QSFP112 MSA industry standards. Featuring LC duplex connector, built-in DDM function, hot swap support and commercial temperature range (0°C~70°C), it enables real-time device status monitoring and easy on-site replacement. With low power consumption, compact QSFP112 form factor and wide OEM compatibility, this module offers a reliable, cost-effective 400G connectivity solution for high-density, long-distance optical network interconnection, supporting seamless network capacity expansion and upgrade.