CBO QSFP28 Direct Attach DAC Cable 0.5m, passive QSFP28-DAC-0.5M

The CBO QSFP28 Direct Attach DAC Cable 0.5m is a passive copper assembly designed for short-reach 100Gbps interconnections between QSFP28 ports. Intended for use in data centre racks, top-of-rack switches and high-density server or storage environments, this 0.5-metre cable enables direct point-to-point connectivity without the need for optical transceivers. The cable supports the QSFP28 form factor and is optimized for low latency and low power consumption in dense networking deployments.

Advantages

This passive DAC cable offers a compact, cost-efficient alternative to optical modules for short-distance links, reducing both initial hardware expense and ongoing power draw. Its fixed-length copper construction simplifies rack cabling and helps maintain predictable signal integrity across 0.5 metres. The QSFP28 form factor ensures compatibility with standard 100Gbps ports that accept direct-attach assemblies, while the passive design eliminates the need for additional cooling associated with active transceivers.

Suitable for

• Short-reach 100Gbps links between servers and switches
• Top-of-rack and middle-of-row switch interconnects in data centres
• High-density server and storage cluster interconnections
• Environments where low latency and low power consumption are required

Key specifications

• Connector type: QSFP28 to QSFP28 passive direct attach
• Length: 0.5 m
• Supported throughput: 100 Gbps
• Cable medium: copper
• Design: passive (no active electronics or optical transceivers)
• Typical use: short-reach, point-to-point connections in racks

How to use

Insert each QSFP28 connector into the corresponding 100Gbps port on the devices to be linked, ensuring secure latching and alignment of the connector. Verify the ports support passive direct-attach copper assemblies and that device firmware or switch settings are configured for 100Gbps operation. After connection, monitor link status through the device management interface and confirm expected throughput and error rates. For best results, avoid sharp bends near the connector and maintain appropriate cable routing within the rack to prevent strain.

Recommendations

Use this 0.5-m passive DAC cable where short, cost-effective 100Gbps links are required. Confirm compatibility with your switch or server vendor documentation before deployment, and follow data centre cabling best practices such as proper labeling, strain relief, and maintaining clearance from heat sources.