400G QSFP-DD Passive Direct Attach Copper Cable — 2 Meter

Save up to 70% versus OEM pricing on this 400G QSFP-DD to QSFP-DD passive DAC cable. Ideal for high-bandwidth, short-range data center interconnects, this 2-meter twinax cable delivers 400 Gigabit Ethernet connectivity with zero power consumption and ultra-low latency. Backed by Reef Telecom's industry-leading 10-year warranty.

Technical Specifications

• Form Factor: QSFP-DD to QSFP-DD (Quad Small Form-factor Pluggable Double Density)
• Data Rate: Up to 400Gbps (8 x 50Gbps PAM4)
• Cable Type: Passive twinax copper (28AWG)
• Cable Length: 2 meters (7 feet)
• Power Consumption: Near zero (~0.1W per end)
• Compliance: QSFP-DD MSA, IEEE 802.3cd, SFF-8636, CMIS
• Operating Temperature: 0°C to 70°C
• Certification: CE, RoHS compliant

Key Benefits

• Massive cost savings vs. 400G optical transceivers and OEM DACs
• Zero latency — passive copper requires no signal processing
• Hot-pluggable for easy installation and maintenance
• Low insertion loss and low crosstalk for reliable signal integrity
• Ideal for Top-of-Rack (ToR), spine-leaf, and adjacent rack connections

Compatibility & Use Cases

This 400G DAC cable is compatible with Cisco (QDD-400-CU2M), Aruba, Juniper (QDD-400G-DAC-2M), NVIDIA/Mellanox, and other platforms with QSFP-DD 400G ports. Perfect for AI/ML clusters, high-performance computing (HPC), cloud data centers, and leaf-spine network architectures. Free shipping on orders over $300.

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.