Direct Attach DAC cable CBO QSFP28-DAC-0.5M 0.5 m for QSFP28 ports, passive copper

CBO QSFP28-DAC-0.5M is a 0.5 m Direct Attach Copper (DAC) cable with QSFP28 connectors designed for short-distance 100GbE or InfiniBand links. Its passive copper construction delivers a straightforward, low-latency physical connection between devices equipped with QSFP28 ports, suitable for rack-to-rack or intra-rack interconnects in data centres, server rooms and network closets. The cable provides a compact, power-efficient alternative to optical transceivers for short reach applications.

Advantages

The passive design reduces power consumption compared with active or optical alternatives and eliminates the need for additional transceiver modules. The short 0.5 m length minimizes signal attenuation and latency, supporting high-speed data transfer with predictable performance. QSFP28 connectors ensure broad compatibility with devices that accept QSFP28 form-factor direct-attach cables, while the copper construction offers robust mechanical durability for repeated insertion and removal.

Suitable for

• Short-distance 100GbE connections between switches
• Intra-rack links connecting servers and top-of-rack switches
• InfiniBand connections for high-performance computing nodes
• Environments where low latency and power efficiency are priorities

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive direct attach copper (DAC)
• Length: 0.5 m
• Data rate: Designed for 100GbE / InfiniBand short-reach links
• Construction: Shielded copper suitable for rack environments

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the network devices until the connector latches. Ensure ports are powered down or follow hot-swap procedures recommended by the equipment vendor if required. After connection, verify link status via device management interfaces and confirm the link negotiates at the expected 100GbE or InfiniBand speed. For best performance, avoid sharp bends and excessive strain on the cable during installation.

Recommendations

Use this 0.5 m passive DAC for short, direct interconnects within racks or between adjacent racks. Avoid extending beyond intended short-reach applications; for longer distances or where optical isolation is required, consider optical transceivers and fiber cabling. Store the cable coiled without tight bends and handle connectors by their housings to prevent damage.