BlueOptics QSFP28 Direct Attach Cable SFP-DAC100-0.5M-BL 100G, DAC, 0.5 m, QSFP28–QSFP28, Black

BlueOptics SFP-DAC100-0.5M-BL is a passive 100GBase-CR4 Direct Attach Cable (DAC) with QSFP28 to QSFP28 connectors and a fixed length of 0.5 m. Designed for short-range electrical connections in racks and between adjacent racks, this twinax copper cable follows MSA standards and is suitable for hardware platforms that accept QSFP28 passive DACs. The cable is black, weighs approximately 0.15 kg, and transmits up to 100 Gbit/s over short distances when used with compatible switch or router ports.

Advantages

The BlueOptics SFP-DAC100-0.5M-BL offers a low-latency, low-power passive connection that requires no active components in the cable itself. It is straightforward to install in data-center rack environments and provides a cost-effective alternative to active optical modules for short-distance links. Built using components from established manufacturers, the cable is intended for long service life and reliable operation when used with compatible hardware.

Suitable for

• Short-distance uplinks between switches within the same rack or adjacent racks
• High-speed interconnects for storage systems and server-to-switch connections
• Data center top-of-rack and leaf-spine architectures requiring 100G links

When it may not be suitable

This passive QSFP28 DAC is intended for short-range electrical connections and is not suitable for long-distance links or for environments requiring optical transmission. It also requires that the connected hardware explicitly supports passive QSFP28 twinax DACs; compatibility should be confirmed with the switch, router, or storage vendor before purchase.

Key specifications

• Cable type: Passive twinax Direct Attach Cable (DAC)
• Connector A: QSFP28 male
• Connector B: QSFP28 male
• Data rate: 100 Gbit/s (100GBase-CR4)
• Length: 0.5 m
• Colour: Black
• Approximate weight: 0.15 kg

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your compatible networking devices until the latch clicks. Ensure devices are powered and configured to accept passive DAC links according to the vendor’s documentation. Verify link status and negotiated speed in the device management interface. For reliable operation, avoid sharp bends and keep the cable within recommended bend-radius limits.

What to consider before purchase

• Confirm that your switch, router, or storage system supports passive QSFP28 twinax DACs
• Verify that 0.5 m length meets your rack layout and port spacing requirements
• Ensure 100GBase-CR4 electrical signalling is compatible with your hardware and intended use

Recommendations

Use this 0.5 m QSFP28 DAC for short, direct connections in data centers where low latency and low power consumption are priorities. Check vendor compatibility and avoid excessive bending to maintain signal integrity and long-term reliability.