NVIDIA Mellanox® MMS4X00-NS400400Gb IB/ETH OSFP DR4 Transceiver: This next-generation OSFP optical transceiver is engineered for 400Gb/s connectivity in NVIDIA ConnectX-7 environments. Uniquely designed with a "Flat Top" shell, it utilizes the riding heatsink of the ConnectX-7 cage for superior thermal dissipation. This is a Dual Protocol module, supporting both InfiniBand (NDR) and Ethernet (400GbE) automatically based on the connected switch, making it a versatile component for AI and Cloud compute nodes.
🔧 Technical Specifications
OEM: NVIDIA / Mellanox
P/N: MMS4X00-NS400
Form Factor: OSFP (Flat Top)
Protocol: InfiniBand (NDR) & Ethernet (400GbE) Auto-Sensing
Interface: 400GBASE-DR4 (MPO-12/APC)
Modulation: 100G-PAM4 (4-Channels)
Reach: 100 Meters on Single Mode Fiber (OS2)
Power Consumption: 9W (4-Ch) / 5W (2-Ch / 200G Mode)
🌐 Engineering Context: The MMS4X00-NS400 represents the shift to OSFP for better thermal management in high-density servers. Unlike QSFP-DD, the OSFP form factor provides better cooling for 400G/800G optics. This "DR4" variant uses parallel Single Mode Fiber (SMF) to achieve 100m reach, critical for pod-to-pod connectivity. Uniquely, when connected to a 1:2 splitter, it detects the link partner and automatically down-trains to 200G, powering down unused lanes to reduce consumption to 5W.
🧠 Typical Use Cases
Primary uplink for NVIDIA ConnectX-7 OSFP Network Adapters.
AI Training Clusters requiring 400Gb/s bandwidth with low latency.
"Twin-Port" architectures where a switch port is split to two ConnectX-7 cards.
Environments requiring flexible deployment between InfiniBand and Ethernet fabrics without changing hardware.
 
✅ Compatible With: NVIDIA ConnectX-7 OSFP Adapters (Flat Top Cage), NVIDIA Quantum-2 InfiniBand Switches, and Spectrum-4 Ethernet Switches. (Requires MPO-12 APC cabling and OSFP cages designed for riding heatsinks)
❌ NOT Compatible With: Standard QSFP-DD or QSFP112 ports (Physical mismatch); OSFP cages requiring "Finned" transceivers (Integrated Heatsink); Multi-Mode Fiber (Aqua/OM4); Standard UPC (Blue) MPO connectors.
 
🛠️ Installation & Optical Logic
Connector Alert (APC): This transceiver utilizes an MPO-12 APC (Angled Polish Connector). You must use fiber cables with Green connectors. Using Blue (UPC) connectors will cause an air gap, resulting in high insertion loss and permanent damage to the laser lens.
Thermal Design: This is a Flat Top unit. It relies on the heatsink built into the ConnectX-7 adapter cage ("Riding Heatsink") to cool the 9W load. Do not use in cages that lack this thermal interface mechanism.
Dual Speed/Power: The firmware is adaptive. If you connect a 200G splitter cable, the unit disables 2 of the 4 lanes and drops power draw from 9W to 5W, reducing thermal load on the PCIe card.
 
🤝 Why Choose T.E.S IT-SOLUTIONS? We specialize in enterprise-grade NVIDIA networking solutions. Every unit is strictly validated for 400Gb/s OSFP performance in our lab. We offer expert consultation, fast worldwide shipping, and a comprehensive warranty to ensure your data center infrastructure runs without compromise.