Copper DAC cable CBO QSFP28-DAC-0.5M 0.5 m passive for QSFP28 ports

Passive copper DAC cable CBO QSFP28-DAC-0.5M is a 0.5 m direct-attach cable engineered for short-range high-speed links between devices with QSFP28 ports. The cable provides a direct electrical connection without the need for separate optical transceivers, enabling low-latency, power-efficient interconnects in rack and data center environments. It supports typical QSFP28 applications such as 100GbE and InfiniBand and is intended for connections between servers, switches and storage systems where short-distance, high-bandwidth links are required.

Advantages

The passive copper DAC design delivers consistent signal integrity for short distances while keeping power consumption and heat generation minimal compared with active optical solutions. Installation is straightforward: the integrated QSFP28 connectors plug directly into compatible ports, reducing hardware complexity and total cost of ownership. Because it is a copper-based direct attach option, it avoids the recurring expense of separate transceivers and fiber patching for short-range interconnects.

Suitable for

• Short-range 100GbE links within racks
• High-performance InfiniBand connections between adjacent devices
• Server-to-switch or switch-to-switch direct connections in data centers
• High-density rack deployments requiring compact, low-power cabling

Key specifications

• Cable type: passive copper direct attach cable
• Connector type: QSFP28 to QSFP28
• Length: 0.5 m
• Application: 100 Gigabit Ethernet and InfiniBand compatible environments
• Typical use: short-reach, low-latency interconnects in racks and data centers

How to use

Ensure both devices support QSFP28 direct-attach copper connections and that ports are powered down or follow hot-plug procedures recommended by the equipment vendor. Align the QSFP28 connectors and insert them fully into the ports until the retention latch engages. After installation, verify link status using the host or switch diagnostics and confirm negotiated speed and lane mapping. For removal, release the retention mechanism and pull the connector straight out to avoid stressing the cable assembly.

Recommendations

Use this 0.5 m passive DAC for short interconnects where low latency and minimal power overhead are priorities. Avoid routing near heat sources or sharp bends; maintain recommended bend radius and secure the cable to prevent strain on connectors. For distances beyond short rack spans or when optical reach is required, consider active or fiber-based alternatives.