This article will introduce the technical features and differences of 400G OSFP/QSFP-DD/QSFP112 modules, presenting the FS 400G module product list and application scenarios to meet various deployment needs. The explosive growth of global data volume has placed higher demands on the bandwidth and performance of data center networks, making 400G optical modules a critical component of modern network infrastructure. The product family includes 400G QSFP-DD, QSFP112 and OSFP optical transceivers, providing interconnection distances from 100m up to 40km for RoCE networking. The 400G optical module is an optical-electrical conversion module that supports high-speed data transmission of 400Gbps. It achieves high-speed interconnection in scenarios such as data centers through photoelectric. This guide provides a comprehensive comparison covering speed, compatibility, port density, applications, and deployment strategies, offering actionable insights for both current and future network designs. Among the most discussed options are OSFP, QSFP-DD, and QSFP112. Each of these standards represents a step forward in bandwidth, density, and efficiency.
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