NSComm NVIDIA/Mellanox Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Active Direct Attach Copper Cable up to 5m(16ft)
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400G QSFP-DD to 2 x 200G QSFP56 Ethernet Active Direct Attach Copper Breakout Cable (ACC/DAC), Active Twinax
Overview
The NSComm 400G QSFP-DD to 2 x 200G QSFP56 Active Direct Attach Copper (ACC/DAC) Breakout Cable is a high-performance, cost-effective solution that lets you split one 400G QSFP-DD port into two 200G links for short-reach connectivity. With integrated active copper and factory-terminated connectors, it simplifies deployment and reduces the need for separate optics and fiber patching in dense rack environments.
Because NVIDIA Ethernet platforms are now the most common choice for 200G/400G switching and AI cluster networking, NSComm supports NVIDIA (Ethernet) coding options on the product page-ideal for NVIDIA-based fabrics-while still offering selectable coding for other major vendors. This breakout cable supports stable high-speed signaling with a retimed 400GAUI-8 (850G PAM4) electrical interface, an 80mm minimum bend radius, and predictable power for rack deployments.
Compatibility Options (Coding) - NVIDIA Focus, Multi-Vendor Ready
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Recommended option: choose NVIDIA (Ethernet) coding for mainstream NVIDIA switch/NIC environments.
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Also available: selectable coding options for other major platforms (choose the matching option on the product page).
Not sure which coding you need? Contact our certified engineers and we'll help confirm the right option for your exact model.
Use Scenarios / Applications
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NVIDIA Ethernet fabric expansion: break out a 400G QSFP-DD switch port into 2 x 200G QSFP56 links for rack-level switching and server/NIC connectivity.
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Leaf/Spine short links (400G to 200G): connect spine or leaf switches to 200G-capable switches or endpoints in compact pods.
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GPU/AI racks (Ethernet): simplify cabling in high-density racks where 400G ports need to feed multiple 200G connections.
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Data center upgrades: migrate to 400G switching while keeping 200G endpoints during phased expansion.
Key Specifications
| Specification | Details |
|---|---|
| Vendor Name | NSComm |
| Product Type | 400G QSFP-DD to 2 x 200G QSFP56 Active Direct Attach Copper (ACC/DAC) Breakout Cable |
| Form Factor | QSFP-DD to 2 x QSFP56 |
| Max Data Rate | 400Gbps (2 x 200Gbps) |
| Cable Type | Active |
| Electrical Interface | 400G AUI-8 (8 x 50G PAM4, retimed) |
| Minimum Bend Radius | 80mm |
| Jacket Material | PVC |
| Temperature Range | 0 to 70C |
| Standards / Compliance | QSFP-DD MSA, SFF-8636, SFF-8679 |
| Power Consumption | 1.45W (QSFP-DD end), 0.62W (per QSFP56 end) |
| Warranty | 5 Years |
Why Choose NSComm 400G to 2 x 200G Breakout ACC/DAC?
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NVIDIA-ready: supports NVIDIA (Ethernet) coding for mainstream deployments.
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One 400G port, two 200G links: maximize port utilization and simplify rack cabling.
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Cost-effective: reduces optics + fiber patching cost for short reach.
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Stable signaling: retimed 400G AUI-8 PAM4 electrical interface for dense fabrics.
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Predictable power: clearly defined power per-end for capacity planning.
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Engineer-backed support: coding selection and topology guidance available on request.
Options
Available lengths: 1m, 2m, 3m, 5m
Coding options: select NVIDIA (Ethernet) or other vendor coding on the product page
More Details
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