400G ACC Cables

Short-Range 400G for AI & Cloud Fabrics

Overview

The NSComm 400G Active Direct Attach Copper (ACC) collection is built for ultra-high bandwidth, short-reach interconnects in modern data centers. Using active twinax copper with integrated 400G pluggable ends, these cables deliver low latency, simple plug-and-play deployment, and a cost-effective alternative to optics for in-rack and adjacent-rack links.

400G ACC is widely used to connect GPU/AI servers to ToR (leaf) switches, and to build leaf-spine uplinks where you need high throughput with minimal complexity.

Broad Compatibility (NVIDIA Options Available)

• QSFP112 ACC is positioned as a generic/multi-vendor option for broad switch/NIC ecosystems.

• QSFP-DD ACC and breakouts can be provided with vendor coding options, including NVIDIA/Mellanox-focused selections for mainstream AI networking.

Need help matching your switch/NIC/DPU? Contact our engineers for quick compatibility guidance.

Product Range

This collection covers both straight-through 400G links and breakout options for mixed-speed environments:

1. 400G QSFP112 ACC (up to 3m)

Best for high-density in-rack 400G connections-clean cabling and low-latency links between servers/NICs and ToR.

2. 400G QSFP-DD ACC (up to 5m)

A flexible 400G copper interconnect for ToR-to-spine or switch-to-switch short runs, especially when you need longer reach inside a row or across adjacent racks.

3. 400G QSFP-DD → 2×200G QSFP56 Breakout ACC (up to 5m) - NVIDIA/Mellanox Focus

Designed for deployments where 400G ports must connect to 200G endpoints. Common in AI clusters migrating between 200G and 400G fabrics, keeping port usage efficient.

4. 400G QSFP-DD → 4×100G QSFP56 Breakout ACC (up to 5m)

Ideal for breaking out a 400G switch port into four 100G links-useful for GPU node uplinks, mixed-generation racks, or gradual upgrades from 100G to 400G.

Key Benefits

• Ultra-high throughput: 400G bandwidth for demanding east-west traffic.

• Low latency: Direct electrical interconnect-great for AI training fabrics.

• Simpler cabling: No separate optics or patch cords; fewer failure points.

• Upgrade-ready breakouts: Connect 400G ports to 200G/100G endpoints cleanly.

• Cost-effective short links: Strong ROI for in-rack and adjacent-rack runs.

Buying Guide

• Choose your form factor:

  • QSFP112 for broad, generic 400G deployments

  • QSFP-DD for wider breakout ecosystems and flexible 400G port planning

• Pick straight vs breakout:

  • Straight 400G for leaf-spine uplinks or server-to-ToR at 400G

  • Breakout for connecting one 400G port to 2×200G or 4×100G

• Match the topology:

  • Server/GPU → ToR (leaf): in-rack 400G links

  • Leaf ↔ spine: adjacent-rack short uplinks

  • 400G switch port → 100G/200G endpoints: breakout for mixed-speed racks

Conclusion

The 400G Active Direct Attach Copper Cable Collection gives you practical 400G connectivity for AI and cloud data centers-supporting QSFP112, QSFP-DD, and breakout paths to 200G and 100G. If you're scaling leaf-spine or building GPU racks, NSComm 400G ACC keeps links fast, clean, and cost-efficient.

⚡ Deploy 400G the simple way-NSComm ACC for AI racks and leaf-spine uplinks.