Network Cable BlueOptics 721064-B21-BL QSFP 4xSFP+ InfiniBand 3m Black

The BlueOptics 721064-B21-BL QSFP 4xSFP+ InfiniBand 3m is a 3-metre direct attach cable designed for short-range, high-speed connections in racks and between adjacent racks. It features a QSFP (Quad Small Form-factor Pluggable) male connector on one end and four SFP+ (Small Form-factor Pluggable Plus) male connectors on the other, supporting aggregated 40 Gbps links or four independent 10 Gbps channels. The cable uses passive twinax copper construction (30 AWG) suitable for electrical signal transmission over short distances and is offered in a durable black jacket for professional networking environments.

Advantages

This BlueOptics/BlueLAN compatible DAC offers a low-latency, low-power connection for high-density network setups. Being MSA-compliant and manufactured from components from established vendors, the cable provides predictable interoperability with major switch, router and storage platforms that support the original form factor and signalling standards. Its passive design reduces failure points and power consumption, while the compact QSFP-to-4xSFP+ form factor allows flexible deployment where a 40G port needs to be split into multiple 10G ports.

Suitable for

• Connecting 40G QSFP ports to four 10G SFP+ ports in data center racks
• Short-range links between adjacent racks or within the same rack
• Aggregated 40G Ethernet, FCoE, Fibre Channel or InfiniBand connections up to 3 m
• High-density switch, router and storage interconnects requiring low latency

Key specifications

• Cable length: 3 m
• Connector configuration: QSFP (male) to 4 × SFP+ (male)
• Transmission type: passive twinax copper (DAC), 30 AWG
• Supported data rates: up to 40 Gbps aggregate (4 × 10 Gbps channels)
• Typical applications: Ethernet, FCoE, Fibre Channel, InfiniBand
• Product colour: Black
• Weight: approx. 0.25 kg

How to use

Verify that both ends of the connected devices support passive QSFP-to-4xSFP+ direct attach cabling and the intended protocols (Ethernet, FCoE, Fibre Channel or InfiniBand). Insert the QSFP connector into the 40G QSFP port and plug the SFP+ connectors into the respective 10G SFP+ ports, ensuring proper seating and latch engagement. Route the cable to avoid sharp bends and excessive tension; observe normal ESD precautions when handling connectors. No external power or transceivers are required for passive operation—link activation and negotiation are handled by the connected hardware.

Recommendations

For reliable performance, use this DAC within the specified 3 m distance and in environments where the host hardware explicitly supports passive DAC twinax solutions. Avoid repeated flexing near the connector boot and maintain a clear airflow path in rack installations. If interoperability is critical, request a test sample or verify compatibility with your hardware vendor documentation before large deployments.