BlueLAN 400G QSFP-DD Direct Attach Cable, 2m, Passive Twinax, 26 AWG, Compatible with Mellanox MCP1660-W002E26

High-density data centers and HPC clusters constantly struggle to move massive amounts of data between switches, routers, and servers without adding latency, power draw, or complexity. This BlueLAN QSFP-DD Direct Attach Cable (DAC) solves that problem by delivering a full 400 Gbps link over a short 2-meter passive copper twinax assembly. It is engineered as a drop-in replacement for the Mellanox MCP1660-W002E26, so you can upgrade or expand your network without changing your existing infrastructure.

Who is it for

This cable is built for network engineers, data center operators, and system integrators who need reliable, high-bandwidth interconnects in racks and adjacent cabinets. It suits environments running Ethernet, InfiniBand, or converged fabrics where low latency and zero power consumption are critical. If you manage dense 400G spine-leaf architectures, AI/ML training clusters, or high-frequency trading systems, this DAC keeps your links stable and cost-effective.

Main features

• 400GBASE-CR4 passive copper twinax cable, 2 meters long, 26 AWG conductors for minimal signal loss.
• QSFP-DD to QSFP-DD connectors, hot-swappable, with a compact form factor that doubles port density versus QSFP28.
• Fully compatible with Mellanox/NVIDIA MCP1660-W002E26 part number, ensuring seamless integration with existing optics and firmware.
• Supports both Ethernet and InfiniBand protocols, making it versatile for converged or dedicated fabrics.
• Zero power consumption (passive design) reduces thermal load and operating costs.

Specifications

• Product Type: Direct Attach Cable (DAC)
• Connector Type: QSFP-DD to QSFP-DD
• Data Rate: 400 Gbps
• Ethernet Standard: 400GBASE-CR4
• Network Protocol Support: Ethernet, InfiniBand
• Cable Length: 2 Meter
• Wire Gauge (AWG): 26 AWG
• Cable Type: Passive Copper Twinax
• Form Factor: QSFP-DD
• Compatibility (OEM Part): Mellanox MCP1660-W002E26
• Brand Compatibility: Mellanox / NVIDIA
• Hot Swappable: Yes
• Number of Lanes: 4
• Application: Data Center Interconnect, High-Performance Computing (HPC)
• Power Consumption: 0W (Passive)

Tips

Use this DAC for short-reach, high-speed connections within the same rack or between adjacent racks. For longer distances, consider active optical cables (AOCs) or optical transceivers with fibre. Always verify compatibility with your specific switch or adapter firmware version before deployment.