DAC cable CBO QSFP28 SC282801L0.5M30 0.5 m — direct attach copper for QSFP28

CBO DAC cable QSFP28 SC282801L0.5M30 is a 0.5 m direct attach copper (DAC) assembly engineered for QSFP28 ports. This short, passive copper cable creates a direct electrical connection between compatible QSFP28 network devices, offering a cost-effective alternative to optical transceivers for short-reach, high-bandwidth links in data centers, switches and servers. The cable is designed to deliver low latency and stable throughput for 100 Gigabit Ethernet applications where a reliable copper interconnect is preferred.

Advantages

The DAC cable provides a low-latency, low-power connection without the need for separate optical modules, reducing hardware complexity and operational costs. Its fixed 0.5 m length minimizes signal degradation and cross-talk in short-reach links while simplifying cable management in dense rack environments. Passive construction ensures plug-and-play compatibility with QSFP28 ports that support direct attach copper assemblies, enabling immediate deployment for high-speed interconnects.

Suitable for

• Short-range 100 Gigabit Ethernet links between switches and routers
• Direct server-to-switch connections in top-of-rack and middle-of-row deployments
• High-density patching in data center topologies where short fixed-length cables are preferred
• Environments that require low-latency and low-power interconnects without optical transceivers

Key specifications

• Connector type: QSFP28 to QSFP28 direct attach
• Cable type: Direct attach copper (passive)
• Length: 0.5 m
• Data rate: Supports 100 Gigabit Ethernet signaling for QSFP28 ports
• Latency: Low electrical latency suitable for short-reach high-bandwidth links
• Form factor: Compact assembly for high-density rack installations

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the devices to be connected, ensuring the latch engages securely. Verify that the host devices support direct attach copper assemblies; some systems may require firmware or port configuration to recognize passive DACs. Once connected, monitor link status indicators on the equipment to confirm successful negotiation at the intended data rate. Remove the cable by pressing the latch and pulling straight out to avoid damage to the connector or port.

Recommendations

Use the 0.5 m DAC cable for short, stable connections inside racks or between adjacent rack units. Avoid tight bends and excessive pulling force; maintain the cable within manufacturer-recommended bend radius and handle connectors by the housing. For deployments where longer reach or optical isolation is needed, consider optical transceivers and fiber cabling instead of direct attach copper.