BlueLAN 400G QSFP-DD to 4x 100G QSFP56 Direct Attach Breakout Cable, 2m, Passive, AWG26, Arista Compatible (CAB-D-4Q-400G-2M-BL)

In high-density data centers, network engineers need reliable 400G breakout connectivity to link next-generation switches to 100G servers and storage. The BlueLAN CAB-D-4Q-400G-2M-BL is a passive Direct Attach Copper (DAC) breakout cable that splits a single 400G QSFP-DD port into four independent 100G QSFP56 ports. With a 2-meter length and AWG26 twinax construction, it delivers low-latency, low-power connectivity for short-reach interconnects.

Key specifications

• Aggregate data rate: 400 Gbps (4x 100G channels)
• Connector A: QSFP-DD
• Connector B: 4x QSFP56
• Cable length: 2 m
• Wire gauge: AWG26
• Cable design: Passive
• Supported protocols: 400GBASE-CR4, 100GBASE-CR
• Compatibility: Arista Networks CAB-D-4Q-400G-2M equivalent

Why choose it

This cable is engineered for seamless integration with Arista Networks platforms, offering a cost-effective alternative to OEM cables without compromising performance. Its passive design consumes no additional power, reducing overall energy costs in dense rack environments. The breakout configuration simplifies cable management by consolidating four 100G links into a single high-density QSFP-DD port.

Ideal use cases

• Connecting 400G QSFP-DD switch ports to 100G QSFP56 server NICs
• High-performance computing clusters requiring low-latency interconnects
• Data center spine-leaf architectures with breakout needs

Good to know

Passive DAC cables are ideal for short distances up to 2 meters, providing reliable signal integrity without signal conditioning. The cable is compliant with SFF-8636 and SFF-8665 standards, ensuring interoperability with a wide range of networking equipment.