DAC cable CBO QSFP28-DAC-0.5M 0.5m compatible with Nokia QSFP28

Direct attach copper (DAC) cable CBO QSFP28-DAC-0.5M is a 0.5 metre passive twinax cable with QSFP28 connectors compatible with Nokia QSFP28 ports. Designed for short-reach, high-speed links in data centres and network racks, this DAC cable supports 100G QSFP28 interconnects and provides a low-latency, energy-efficient physical connection between switches, routers and servers. The compact 0.5 m length minimises cable clutter and is suitable for adjacent equipment within the same rack or neighbouring racks.

Advantages

This passive twinax cable delivers reliable 100G connectivity with low power consumption and minimal signal processing overhead, resulting in lower latency compared with active optical solutions for short distances. The QSFP28 form factor ensures compatibility with standard QSFP28 ports and hot-pluggable installation, while the robust connectors and shielded twinax construction offer consistent electrical performance and mechanical durability for dense rack deployments.

Suitable for

• Short-reach 100G links between top-of-rack and spine switches
• Connections between servers and high-performance network interface cards (NICs)
• Interconnects in data centre racks and network closets
• Temporary high-speed links for testing and migration tasks

Key specifications

• Cable type: passive twinax (direct attach copper)
• Connector type: QSFP28 on both ends
• Length: 0.5 metre
• Data rate: 100 Gbit/s (QSFP28 standard)
• Latency: low, suitable for short-reach high-performance links
• Power: passive, no external power required
• Physical: compact, rack-optimised form factor

How to use

Install the DAC cable by inserting each QSFP28 connector into the corresponding QSFP28 port until the latch engages; no additional tools are required. Ensure both devices are powered down or follow hot-plug guidelines of your equipment vendor if connecting live. Verify link status and speed via the network device management interface after installation. For best results, avoid sharp bends and maintain recommended bend radius to preserve signal integrity.

Recommendations

Use this 0.5 m passive QSFP28 DAC cable for short interconnects within the same rack or between adjacent racks. Keep the cable clear of high-heat sources, avoid tight bends near the connectors, and check device firmware compatibility notes for passive twinax support to ensure reliable 100G links.