400G QSFP-DD Passive Direct Attach Copper (DAC) Twinax Cable — 1 Meter

Upgrade your data center interconnects with this 400G QSFP-DD to QSFP-DD passive DAC cable. Delivering full 400 Gigabit Ethernet bandwidth over cost-effective copper, this 1-meter twinax cable eliminates the need for expensive transceivers — just plug in and connect at 400G with zero power consumption.

Specifications

• Data Rate: 400Gbps (8 x 50Gbps PAM4 lanes)
• Connector: QSFP-DD on both ends
• Cable Type: Passive twinax copper, 30AWG
• Length: 1 meter (3.3 ft)
• Standards: QSFP-DD MSA, IEEE 802.3cd, SFF-8636 compliant
• Compliance: RoHS compliant, lead-free
• Power: Zero power consumption (passive design)
• Temperature: 0°C to 70°C operating range

Compatibility

Compatible with all major 400G QSFP-DD switch platforms including Cisco, Arista, Juniper, Dell, NVIDIA/Mellanox, and more. Ideal for top-of-rack (ToR) switch-to-switch, switch-to-server, and GPU cluster interconnects in data centers and AI/HPC environments.

Why Buy from Reef Telecom?

• Industry-leading 10-year warranty on all equipment
• Free shipping on orders over $300
• Every cable tested for signal integrity before shipping
• Volume pricing available for spine/leaf deployments

Also available in 2m lengths. Need a different length or breakout configuration? Contact us for custom solutions.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.