Direct Attach DAC cable CBO QSFP28-DAC-0.5M 0.5m QSFP28 to QSFP28 passive copper cable

CBO QSFP28-DAC-0.5M is a 0.5 m passive Direct Attach Copper (DAC) cable with QSFP28 connectors at both ends, engineered for short-range 100Gbps interconnects. It is intended for use in data centers and high-performance networks to connect servers, switches and routers. The cable provides a compact, low-latency, and low-power alternative to optical transceivers for short-distance links such as top-of-rack and adjacent-rack connections.

Advantages

This passive QSFP28-to-QSFP28 DAC cable delivers 100Gbps aggregated throughput with minimal signal processing and reduced power consumption compared with active optical modules. Its short 0.5 m length minimizes insertion loss and latency while simplifying cable management in dense rack environments. The copper construction eliminates the need for separate transceivers, lowering both acquisition and operating costs for short-range links. The standardized QSFP28 connectors ensure compatibility with equipment ports that support QSFP28 direct-attach copper interfaces.

Suitable for

• Top-of-rack switch to server high-bandwidth links
• Adjacent rack or chassis interconnects in data centers
• High-performance computing clusters requiring low-latency connectivity
• Short-reach 100Gbps uplinks inside network racks

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive Direct Attach Copper (DAC)
• Data rate: 100 Gbps
• Length: 0.5 m
• Typical applications: Short-range interconnects in data centers and network equipment
• Latency: minimal due to copper direct-attach design

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on networking equipment until the connector latches securely. Ensure that both endpoints support passive QSFP28 DAC connections and that port settings (speed and lane configuration) are configured to match 100Gbps operation if required by the switch or server. Avoid excessive bending or pulling on the cable; maintain the recommended bend radius to prevent mechanical stress. For installation, route the cable to minimize interference with airflow and other cables within the rack.

Recommendations

Use this 0.5 m passive DAC cable for short, fixed-length 100Gbps links where low-latency and low-power operation are priorities. Verify compatibility with your equipment’s QSFP28 ports and with the vendor’s hardware compatibility list before deployment. Store and handle the cable in a clean environment and avoid sharp bends or kinks to preserve signal integrity.