InfiniBand/fibre optic cable BlueOptics SFPPQSFP28-05-BL 5 m QSFP 4xSFP+

The BlueOptics SFPPQSFP28-05-BL is a 5 m InfiniBand / fibre optic direct attach cable with a QSFP connector on one end and four SFP+ connectors on the other. Designed for short-reach high-speed links in racks and between adjacent racks, this passive twinax-style assembly supports multi-lane connections and is intended for use where a compact, low-latency copper or compatible solution is required. The male-to-male configuration enables straightforward connectivity between switches, routers, storage systems and other hardware that accept QSFP to 4xSFP+ direct attach connections.

Advantages

The cable supports aggregated link speeds up to 40 Gbit/s over the 5 m length using a QSFP to 4xSFP+ topology suitable for InfiniBand, Ethernet and related protocols where the host hardware supports passive direct attach solutions. Its 26 AWG conductor size and MSA-compliant form factor provide predictable electrical characteristics for short-distance interconnects. Passive construction means no external power is required in the cable itself, resulting in low power consumption and reduced points of failure. Compatibility testing and use of quality components contribute to stable performance and a long service life.

Suitable for

• Short-reach interconnects in data center racks and between adjacent racks
• 40GBase-CR4 and 4x10GBASE-CR applications where QSFP to 4xSFP+ connectivity is required
• High-performance computing and InfiniBand networking links
• Connections between switches, routers, and storage systems supporting passive DAC assemblies

Key specifications

• Cable length: 5 metres
• Connector A: QSFP (male)
• Connector B: 4 × SFP+ (male)
• Maximum aggregated data rate: up to 40 Gbit/s over the 5 m link (4×10G lanes)
• Cable type: passive direct attach twinax-style copper assembly
• Conductor gauge: 26 AWG
• Form factor: MSA-compliant QSFP to 4×SFP+ breakout

How to use

Install the QSFP end into the QSFP port of the host device and insert the four SFP+ ends into the corresponding SFP+ ports of the receiving equipment, or vice versa depending on system design. Ensure both devices officially support passive QSFP-to-4xSFP+ direct attach connections and the intended protocol (for example 40GBase-CR4 or 4×10GBASE-CR). Route the cable to avoid sharp bends and mechanical stress, keeping the length within the specified 5 m range for reliable signal integrity. No additional power or transceiver modules are required in the cable itself; link configuration may require host-side settings or firmware that recognizes passive DAC connections.

Recommendations

Verify compatibility with the specific switch, router or storage model before installation and test the link after connecting. For best results, use the cable for short rack-to-rack or within-rack connections up to 5 m, avoid tight bends near the connectors, and confirm the network ports are configured for the intended aggregated link speed and protocol.