BlueOptics QSFP28-DAC-0.5M-AT-BL InfiniBand/fibre optic cable 0.5m Male/Male

The BlueOptics QSFP28-DAC-0.5M-AT-BL is a 0.5 meter QSFP28 Direct Attach Cable (DAC) designed for short-reach high-speed connections in data centres and enterprise networks. This passive twinax copper cable features QSFP28 male connectors on both ends and supports up to 100G data rates using the 100GBase-CR4 electrical interface and InfiniBand protocols where supported. The cable is MSA-compliant and intended for connecting switches, routers, storage systems and other hardware within the same rack or between adjacent racks.

Advantages

The cable provides a low-latency, low-power and cost-effective connectivity option for high-density installations. Passive twinax construction eliminates active components in the cable itself, reducing power consumption and points of failure. MSA compliance and tested componentry ensure interoperability with major networking platforms that support QSFP28 DAC modules. The short 0.5 m length simplifies rack cabling and reduces signal attenuation for reliable 100G links over short distances.

Suitable for

• 100G short-reach connections between switches and routers within the same rack
• Interconnects for storage systems and high-performance computing (HPC) nodes
• InfiniBand and Ethernet applications up to 100G where QSFP28 passive DACs are supported
• High-density data centre top-of-rack (ToR) cabling

Key specifications

• Connector type: QSFP28 male to QSFP28 male
• Length: 0.5 meter
• Data rate: up to 100 Gbit/s (100GBase-CR4 compatible)
• Cable type: passive twinax copper (30 AWG)
• Standards: QSFP MSA compliant, suitable for Ethernet, FCoE, Fibre Channel and InfiniBand applications up to 100G
• Typical power consumption: passive (low power draw, cable itself does not contain active electronics)

How to use

Ensure both devices support passive QSFP28 DACs and the 100GBase-CR4 or equivalent electrical interface. Power down or follow hot-plug procedures recommended by your hardware vendor, align the QSFP28 connectors and insert the cable into the QSFP28 ports until they latch. Confirm link status in the device management interface and verify operational parameters such as link speed and error counters. For replacement or troubleshooting, inspect connector contacts and cable routing for bends or strain and reseat the cable as necessary.

Recommendations

Use this 0.5 m passive QSFP28 DAC for in-rack or adjacent-rack connections where short, reliable 100G links are required. Avoid tight bending and excessive strain on the cable, and ensure connected equipment expressly supports passive QSFP28 DACs and the 100GBase-CR4 or corresponding protocol to guarantee compatibility and optimal performance.