The 400GBASE-VR4F OSFP module, MTP/MPO-12 connector, up to 50m over parallel OM4 multi-mode fiber. It is compliant with OSFP MSA, IEEE 802. 3ck protocol and 400GAUI-4 standards. The built-in digital diagnostics monitoring (DDM) allows access to real-time operating parameters. This specification defines the electrical connectors, electrical signals and power supplies, and mechanical and thermal requirements of the OSFP Module, connector, and cage systems. The OSFP Management interface is described in a separate document: “Common Management Interface Specification. Enter OSFP (Octal Small Form Factor Pluggable) — an open standard designed to deliver scalable, thermally optimized, and high-density optical connectivity for hyperscale, cloud, and AI-driven environments. OSFP was among the first form factors to support native 800G, making it a key enabler for ultra-high-speed deployments. It is designed to accommodate future networks' increasing data rate demands, specifically the 400G Ethernet. The OSFP transceiver is not just about.
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