InfiniBand/fibre optic cable BlueOptics 844480-B21-BL 5 m SFP28 Male/Male

The BlueOptics 844480-B21-BL is a 5 m InfiniBand / fibre optic style direct attach cable with SFP28 connectors on both ends. Designed for short-range, high-speed interconnects in rack and adjacent-rack environments, this 25G-capable twinax copper direct attach cable (DAC) provides a straightforward physical link between SFP28 ports on switches, routers, storage systems and compatible host adapters. The cable follows MSA-compliant SFP28 connector form factor and supports electrical 25GBase-CR signalling over a 5 metre distance, enabling reliable data transmission for Ethernet, FCoE, Fibre Channel and InfiniBand applications where the connected hardware supports passive DAC operation.

Advantages

This 5 m SFP28 Male–Male cable offers a low-latency, low-power connection with passive twinax copper construction suitable for short links within or between racks. It is manufactured to MSA standards and assembled from high-quality components to ensure consistent signal integrity and long service life. The passive design eliminates active transceiver electronics in the cable, reducing heat and power consumption and simplifying installation in dense data centre deployments.

Suitable for

• High-speed 25G links between switches in the same rack or neighbouring racks
• Direct connections between servers and storage systems with SFP28 ports
• Ethernet, FCoE, Fibre Channel and InfiniBand short-reach interconnects up to 25 Gbps
• Environments requiring cost-effective, power-efficient cabling for predictable short distances

Key specifications

• Cable length: 5 metres
• Connector type: SFP28 male to SFP28 male
• Transmission: Passive twinax copper supporting 25GBase-CR
• Applicable protocols: Ethernet, FCoE, Fibre Channel, InfiniBand (up to 25 Gbps over 5 m)
• Wire gauge: 30 AWG (typical for twinax DAC)
• Form factor: MSA-compliant SFP28

How to use

Install the cable by inserting each SFP28 connector into the corresponding SFP28 port on your network devices until the latch engages. Ensure both devices officially support passive 25GBase-CR direct attach cables and that firmware or software restrictions do not prevent use of third-party DACs. Route the cable to avoid sharp bends and mechanical strain; maintain the minimum bend radius recommended for twinax cables. For best results, connect devices while powered down or follow your equipment vendor’s hot-plug guidelines.

Recommendations

Verify device compatibility with passive SFP28 DACs before deployment and test the link in your environment. For installations in dense racks consider cable routing and strain relief to prevent connector stress. Use this 5 m passive SFP28 DAC for short, fixed links where low latency and low power consumption are priorities.