DAC cable CBO QSFP28 3m for Dell Networking (470-ABQB-BL) direct-attach copper

CBO QSFP28 Direct Attach Copper (DAC) cable, 3 m, is a factory-terminated copper interconnect designed for short-reach, high-bandwidth links between QSFP28 ports in network switches and servers. The cable supports 100GbE and other QSFP28-compatible applications, offering a low-latency, energy-efficient physical connection appropriate for intra-rack and rack-to-rack deployments where fiber transceivers are not required. The assembly provides a straightforward solution for dense data center topologies and hyperscale environments that require predictable electrical performance over a 3 meter channel.

Advantages

The DAC cable delivers predictable signal integrity and low latency due to its direct-attach copper construction and QSFP28 connectivity. It eliminates the need for separate optical transceivers and fiber patching for short distances, reducing component count and simplifying installation and inventory management. The pre-terminated design ensures consistent electrical characteristics and saves time during deployment while maintaining compatibility with QSFP28 ports that accept copper direct-attach assemblies.

Suitable for

• Short-reach 100GbE links between switches and servers within the same rack
• Top-of-rack to aggregation switch connections in data centers
• High-density patching in switch-to-switch or server-to-switch configurations
• Environments where cost-effective, low-power connectivity is required

Key specifications

• Interface: QSFP28 electrical direct-attach copper
• Length: 3 meters
• Data rate: supports up to 100 Gigabit Ethernet per QSFP28 standards
• Connector style: QSFP28 plug on both ends for direct port mating
• Cable type: twinax copper assembly optimized for short-range high-speed links
• Latency: minimal propagation delay typical of copper direct-attach assemblies

How to use

Insert each QSFP28 connector into the corresponding QSFP28 ports on the network devices until the latch engages. Ensure devices are powered down or follow hot-plug guidelines from the device manufacturer if live insertion is permitted. Verify link status through the switch or server management interface and confirm the negotiated speed (for example, 100GbE) in the device port configuration. Route the cable to avoid tight bends and physical strain; maintain recommended bend radius and secure the cable to prevent movement that could affect connections.

Recommendations

Use this 3 m DAC cable for short-range connections where QSFP28 copper interconnects are supported by both devices. Avoid exceeding the recommended bend radius, keep the cable away from sources of electromagnetic interference, and confirm compatibility with the specific QSFP28 ports on your network equipment prior to deployment.