DAC cable CBO QSFP28-DAC-3M 3m passive copper QSFP28 to QSFP28

CBO QSFP28-DAC-3M is a 3-meter passive copper direct attach cable (DAC) with QSFP28 connectors on both ends, designed for short-range, high-speed interconnects in data center and networking environments. The cable provides a cost-effective link for direct server-to-switch or switch-to-switch connections, supporting 100Gbps lanes through a consolidated QSFP28 interface while reducing the need for separate optical transceivers. Its passive design minimizes power consumption and latency for tightly coupled equipment racks and top-of-rack deployments.

Advantages

The passive copper construction offers low insertion loss and predictable electrical performance for short-reach connections. Because no external transceivers are required, the DAC cable lowers total system cost and reduces heat generation inside network equipment. Its QSFP28-to-QSFP28 form factor simplifies installation and ensures physical compatibility with QSFP28 ports, delivering a compact, low-latency solution for high-throughput links.

Suitable for

• Server-to-switch connections within the same rack or adjacent racks
• Switch-to-switch links in data center aggregation and spine-leaf architectures
• High-performance computing clusters requiring short, high-bandwidth interconnects
• Environments where reduced power consumption and minimal latency are priorities

Key specifications

• Cable type: Passive copper Direct Attach Cable (DAC)
• Connector type: QSFP28 to QSFP28
• Length: 3 meters
• Data rate: Supports 100Gbps per QSFP28 interface (aggregate depending on system)
• Application: Short-reach interconnects for data center and networking equipment
• Form factor: Low-profile QSFP28 module ends for dense port layouts

How to use

Ensure both endpoints support QSFP28 electrical direct-attach connections and that the ports are powered down or follow your equipment vendor’s hot-plug guidance before insertion. Align the QSFP28 connectors with the device ports and insert until the latch engages. Verify link status through the host device management interface or LEDs. For removal, release the retaining latch and pull the module straight out to avoid damaging ports. Route the cable to avoid sharp bends; maintain the manufacturer’s minimum bend radius and prevent undue strain on connectors.

Recommendations

Use this passive QSFP28-DAC cable for short, fixed-length connections inside racks or between adjacent racks. Avoid using passive copper DACs for runs beyond the recommended short-reach distances and select active cables or optical transceivers for longer spans or where signal conditioning is required. Verify compatibility with switch and server vendor interoperability lists before deployment and maintain cable routing practices that ensure adequate airflow and mechanical protection.