InfiniBand/fibre optic cable BlueOptics QSFP28-4SFP28-CABLE_3-BL 3 m 4xSFP28

The BlueOptics QSFP28-4SFP28-CABLE_3-BL is a 3-meter InfiniBand/fibre optic direct attach cable with a QSFP28 plug on one end and four SFP28 plugs on the other. This male-to-male cable is intended for short-range high-speed connections in racks and between adjacent racks. It supports electrical 100GBase-CR4 and 4x25GBASE-CR applications over a 3 m distance and is suitable for use in hardware platforms that accept QSFP28 to 4xSFP28 direct attach connections.

Advantages

The cable provides a consolidated 100 Gbps link split into four 25 Gbps channels, enabling flexible port aggregation and port breakout configurations. As a passive twinax direct attach solution with 26 AWG conductors, it offers low power consumption, low latency and a simple mechanical design that reduces failure points. The product is manufactured to industry MSA-compliant dimensions and uses high-quality components to support extended operational lifetimes in data centre environments.

Suitable for

• Short-range interconnects within racks and between adjacent racks
• Linking switches, routers and storage systems that support QSFP28 to 4xSFP28 DACs
• 100G Ethernet, FCoE, Fibre Channel and InfiniBand links up to 3 m
• Port breakout scenarios where one QSFP28 port is split into four SFP28 ports

Key specifications

• Cable length: 3 meters
• Connector type: QSFP28 (one end) to 4 × SFP28 (other end)
• Transmission: electrical twinax direct attach (passive DAC)
• Data rate: supports up to 100 Gbps (4 × 25 Gbps lanes)
• Conductor gauge: 26 AWG
• MSA-compliant mechanical and electrical design
• Typical use: short-distance, high-speed rack interconnects

How to use

Install the QSFP28 plug into a compatible QSFP28 port and plug the four SFP28 connectors into the corresponding SFP28 ports on the target equipment. Ensure that the host devices support passive DAC QSFP28-to-4xSFP28 breakout functionality and that port configuration (speed and lane mapping) is set appropriately in the switch or router firmware. Handle connectors carefully, avoid sharp bends and maintain the specified bend radius to prevent signal degradation.

Recommendations

Use this cable for short, fixed connections inside racks or between directly adjacent racks where electrical DAC is supported. Verify device compatibility and software support for passive QSFP28 breakout before deployment. For longer distances or optical transceiver requirements, choose appropriate active or fibre-optic solutions instead.