CBO QSFP28-DAC-0.5M Passive Copper DAC Cable 0.5 m

The CBO QSFP28-DAC-0.5M Passive Copper DAC Cable 0.5 m is a short-reach direct attach cable designed for QSFP28 ports. This 0.5-metre passive copper assembly provides a straightforward physical connection between compatible networking devices, offering low latency and reduced power consumption compared with active optical solutions. It is intended for high-density environments such as data centres and server rooms where reliable, cost-effective short links are required.

Advantages

The passive copper construction delivers stable signal integrity for short distances while eliminating the need for external optics or transceivers. Its half-metre length minimises cable clutter in racks and simplifies airflow management. The cable supports easy hot-pluggable installation into QSFP28 ports and reduces total system power draw compared with active alternatives. The robust connectors and cable assembly are suitable for repeated insertion and removal during maintenance or reconfiguration.

Suitable for

• Rack-to-rack connections within the same equipment row
• Within-rack links between switches, routers and servers
• High-density top-of-rack switch deployments requiring short, low-latency links
• Environments prioritising energy-efficient, cost-effective interconnects

Key specifications

• Connector type: QSFP28 to QSFP28 compatible
• Cable type: Passive copper Direct Attach Cable (DAC)
• Length: 0.5 m (half metre)
• Use case: Short-reach, direct device interconnect
• Latency: Low-latency physical link suitable for high-throughput applications
• Power: Passive design with no active power draw in the cable itself

How to use

Insert each QSFP28-compatible connector into the corresponding port on the devices to be connected, ensuring the connector latch engages. No additional transceivers or configuration are required at the cable level; device ports should be configured according to the vendor instructions for link speed and protocol. For best results, route the cable to avoid sharp bends and excessive tension, and verify link status LEDs or management interfaces after installation.

Recommendations

Use this 0.5 m passive DAC cable for short, direct links within racks or between adjacent racks. Maintain proper bend radius, avoid kinking the cable, and handle connectors by the housing to preserve mechanical integrity. For deployments requiring longer reach or electrical isolation, consider active optical or fibre-based alternatives.