NVIDIA MMA4Z00-NS400 400G OSFP SR4 Transceiver for High-Speed Server Connectivity

The MMA4Z00-NS400 delivers flexible, high-bandwidth connectivity for NVIDIA ConnectX-7 host adapters. Its key innovation is dual-speed operability: it functions natively as a 400Gb/s device but automatically scales down to a 200Gb/s NIC card when connected via 1:2 splitter cables, simultaneously reducing power consumption. Designed with a flat-top OSFP shell to interface with the cooling solution on ConnectX-7 cards, it serves as the perfect optical counterpart to the high-density mq9700 series switches, enabling efficient scaling of AI and HPC clusters.

The NVIDIA MMA4Z00-NS400 is a 400 Gigabit per second (Gb/s), single-port, OSFP form-factor, multimode (SR4) optical transceiver. It is specifically designed to be inserted into ConnectX-7-based PCIe network interface cards (NICs), providing the optical interface to connect to upstream switches equipped with 800G twin-port OSFP transceivers.

This transceiver is a core component in building end-to-end NDR InfiniBand or 400GbE networks. It shares identical internal electronics with its QSFP112 counterpart, differing only in the physical shell to fit the OSFP cage on ConnectX-7 adapters.

• Dual-Protocol, Auto-Sensing: Supports both NDR InfiniBand and 400Gb Ethernet. The correct firmware is activated based on the connected switch's protocol.
• Adaptive Dual-Speed Operation:
  • 400Gb/s Mode: Uses all 4 lanes with straight MPO cables.
  • 200Gb/s (NDR200) Mode: Activated automatically with 1:2 splitter cables, using only 2 lanes.
• Optimized Power Profile: Maximum power is 8.5W in 400G mode and only 5.5W in 200G mode, thanks to automatic channel deactivation.
• Short-Reach Multimode Optics: 850nm VCSEL-based design supporting up to 50m over OM4 fiber and 30m over OM3.
• Flat-Top Thermal Design: Shell is designed to mate with the riding heat sink integrated into the ConnectX-7 adapter cage for effective cooling.
• Comprehensive Management: Compliant with OSFP MSA and CMIS 4.0 standards, featuring full Digital Diagnostic Monitoring (DDM).

This advanced network card component is built on several industry standards and NVIDIA innovations:

• Form Factor & Management: OSFP MSA Specification Rev. 1.12 compliant. Managed via the Common Management Interface Specification (CMIS) 4.0.
• Modulation & Signaling: Employs 100Gbaud PAM4 (Pulse Amplitude Modulation, 4-level) per lane for both electrical and optical interfaces.
• Optical Design: Uses a reliable 850nm VCSEL array for multimode transmission. Features an MPO-12/APC (Angled Physical Contact) connector to minimize optical back-reflection.
• Diagnostics: Integrated microcontroller provides real-time DDM for parameters like temperature, voltage, laser bias current, and TX/RX optical power per lane.

The transceiver acts as an electro-optical gateway for the ConnectX-7 NIC card. It receives four lanes of 100G-PAM4 electrical signals from the adapter, converts them to optical signals via its VCSEL array, and transmits them over four multimode fibers.

Connection Scheme: The MMA4Z00-NS400 is typically connected to one port of an 800G twin-port transceiver (like the MMA4Z00-NS) in a switch. This requires a Type-B crossover fiber cable (e.g., MFP7E10 for 400G, MFP7E20 for 200G). This cable internally crosses transmit and receive fibers to ensure the transmitter of one module aligns with the receiver of the other.

The speed is determined by the cable type: a 4-channel straight cable enables 400G; a 1:2 splitter cable activates only 2 channels in the transceiver, creating a 200G link.

• High-Density AI/ML Server Connectivity: Connect individual servers equipped with ConnectX-7 network cards to 800G-capable spine switches (e.g., mq9700 platforms) in GPU clusters.
• Flexible Cluster Scaling:
  • One switch twin-port can connect to two 400G servers (using straight cables).
  • One switch twin-port can connect to four 200G servers (using splitter cables), optimizing port utilization.
• High-Performance Computing (HPC) Fabrics: Provide low-latency, high-bandwidth links for compute nodes within InfiniBand-based supercomputing environments.
• Consolidated Data Center Networks: Serve as the server-side optical interface in next-generation 400GbE leaf-spine architectures.

• Intelligent Power Scaling: Unique auto-negotiation reduces power by ~35% when operating in 200G mode, directly lowering OPEX and thermal load in server chassis.
• Deployment Flexibility: One transceiver SKU supports two common speed tiers (400G and 200G), simplifying sparing and allowing for graceful network bandwidth scaling.
• Ecosystem Optimization: As part of the NVIDIA end-to-end solution, it is rigorously validated with ConnectX-7 adapters and Quantum-2/Spectrum-4 switches (mq9700 series), ensuring plug-and-play reliability.
• Superior Thermal Integration: The flat-top design is specifically engineered for the thermal management system of ConnectX-7 cards, ensuring stable operation under full load.
• Future-Proof Protocol Support: Dual-protocol firmware eliminates the need for separate InfiniBand and Ethernet transceiver inventories.

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• Warranty: Full manufacturer's warranty. Inquire about extended service level agreements (SLAs).
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