Direct-Attach-kaapeli BlueOptics QSFP28–4×SFP28, 10G-kaistat, 5 m, uros-uros

BlueOptics DAC-QSFP-4SFP-10G-5M-BL is a 5 m direct attach cable with a QSFP28 plug on one end and four SFP28 plugs on the other. It provides four independent 10G lanes for connecting a QSFP28 port to up to four SFP28 ports, enabling short-reach aggregation, breakout and server-to-switch links in racks and adjacent racks. The cable is a passive twinax copper assembly designed for low-latency electrical signal transmission over short distances and is intended for use with equipment that supports QSFP28-to-4×SFP28 DAC connections.

Advantages

The cable offers a compact, single-cable breakout solution that carries four 10G lanes in a 5 m length, reducing the number of separate cables required for multi-port connections. As a passive direct attach twinax cable it requires no additional power for signal conversion, resulting in low power consumption and minimal latency. The construction follows common MSA-compatible twinax practices for mechanical and electrical compatibility with supporting hardware.

Suitable for

• Short-reach aggregation between switches in the same rack or adjacent racks
• Breakout connections from a QSFP28 port to multiple SFP28 ports
• Server-to-switch links requiring four 10G lanes over a 5 m distance
• High-density rack installations where space and cable management are important

Key specifications

• Cable type: passive twinax copper direct attach
• Connectors: QSFP28 (male) to 4 × SFP28 (male)
• Aggregate lanes: 4 × 10G electrical lanes
• Length: 5 meters
• Wire gauge: 26 AWG
• Typical applications: Ethernet, FCoE, Fibre Channel and InfiniBand over short distances (protocol support depends on connected equipment)

How to use

Install the QSFP28 end into the source equipment QSFP28 port and plug the four SFP28 ends into the target SFP28 ports. Ensure both ends are fully seated and that the connected devices support passive QSFP28-to-4×SFP28 direct attach operation and the intended multi-lane breakout configuration. Avoid bending the cable sharply near the connectors and verify link status on the connected devices after insertion. Use appropriate ESD precautions when handling connectors.

Recommendations

For reliable operation, use this passive DAC only within short-reach applications up to 5 m and in hardware that explicitly supports QSFP28 to 4×SFP28 breakout cables. Maintain cable bend radius recommendations, keep connectors clean, and confirm firmware or port settings on your switches and servers to enable 10G lane breakout modes where required.