DAC Cable BlueOptics DAC-QSFP28-4SFP28-25G-3M-BL 3m QSFP28 to 4xSFP28

The BlueOptics DAC-QSFP28-4SFP28-25G-3M-BL is a 3 m direct attach copper (DAC) cable with a QSFP28 connector on one end and four SFP28 connectors on the other. Designed for short-reach, high-speed links in racks and between adjacent racks, this passive twinax cable supports aggregated 100GBase-CR4 and 4x25GBase-CR electrical transmission over a 3 meter distance. Manufactured to MSA guidelines and intended for use in hardware platforms that support QSFP28-to-4xSFP28 DACs, it provides a straightforward, low-latency connection option for switches, routers and storage systems requiring up to 100 Gbit/s aggregated throughput.

Advantages

This 3 m DAC cable delivers reliable short-distance connectivity with low power consumption and minimal latency because it uses a passive twinax copper design. Compliance with MSA form factors and use of established component suppliers ensure compatibility with major networking hardware that supports QSFP28 and SFP28 interfaces. The compact, fixed-length cable simplifies installation in dense rack environments and reduces the need for external transceivers, lowering both purchase and operating costs.

Suitable for

• High-density rack-to-rack links and intra-rack connections
• Aggregated 100GBase-CR4 or 4x25GBase-CR short-reach links
• Switch-to-switch, switch-to-router or switch-to-storage system connections
• Data center top-of-rack and spine-leaf architectures requiring low latency

Key specifications

• Cable length: 3 m
• Connector type (end 1): QSFP28
• Connector type (end 2): 4 × SFP28
• Cable type: Passive twinax copper (DAC)
• Transmission: up to aggregated 100 Gbit/s (100GBase-CR4 / 4 × 25GBase-CR)
• Conductor gauge: 26 AWG
• Product colour: Black and Silver
• Weight: 0.25 kg

How to use

Install the DAC by firmly inserting the QSFP28 connector into the QSFP28 port on the source device and inserting each SFP28 connector into the corresponding SFP28 ports on the destination device(s). Ensure both devices officially support passive QSFP28-to-4xSFP28 DAC connections and the chosen transmission modes (100GBase-CR4 or 4x25GBase-CR). Route the cable to avoid tight bends, excessive strain or pinch points and secure it within the rack to maintain proper airflow and cable management. No external power or configuration of the cable itself is required; the connected hardware negotiates link parameters according to supported standards.

Recommendations

For reliable operation, verify hardware compatibility with QSFP28-to-4xSFP28 passive DACs before deployment, keep the cable length within the specified 3 m for guaranteed signal performance, and avoid repeated flexing near the connector boots. Use in environments with appropriate ventilation and within the equipment manufacturer's recommended temperature range to maximize service life.