DAC cable CBO QSFP28-DAC-2M 2 m passive copper for QSFP28 ports

The BlueOptics DAC cable CBO QSFP28-DAC-2M is a 2-metre passive copper direct attach cable designed for QSFP28 ports. Intended for short-reach links, this cable connects compatible switches, routers and servers without the need for separate optical transceivers. Its fixed-length copper assembly provides a low-latency electrical link suitable for rack-to-rack or within-rack interconnects in data centre environments where cost-effective and reliable connectivity is required.

Advantages

The passive copper construction offers low power consumption and minimal latency compared with active or optical solutions, and installation is simplified because no module insertion is required. The 2 m length balances flexibility and signal integrity for common rack and adjacent-rack distances. Compatibility with QSFP28 ports makes the cable suitable for 100 Gigabit Ethernet and other QSFP28-capable equipment, providing a plug-and-play connection that reduces component count and operational complexity.

Suitable for

• Short-reach data centre links between switches and routers
• Rack-to-rack connections and within-rack interconnects
• Direct server-to-switch or server-to-router connections
• Environments where low latency and low power are priorities

Key specifications

• Cable type: passive twinax copper direct attach
• Interface: QSFP28 to QSFP28
• Length: 2 metres
• Data rate support: designed for 100 Gigabit-class links (QSFP28)
• Latency: low-latency electrical connection suitable for short-reach links
• Installation: plug-and-play, no separate transceivers required

How to use

Insert each QSFP28 connector into the corresponding port on the networking devices until the connector latches. Ensure both ends seat fully and that port activity indicators show link status according to the equipment’s documentation. For best performance, avoid sharp bends and excessive strain on the cable; maintain recommended bend radius and secure the cable so it does not obstruct airflow or other components. If link negotiation fails, verify port configuration and compatibility with QSFP28 passive DACs in the device manuals.

Recommendations

Use the cable for short-distance links within racks or between adjacent racks. Verify compatibility with your switches, routers and servers before deployment, and follow standard electrostatic discharge (ESD) precautions when handling connectors. Replace the cable if physical damage, bent contacts or repeated connection issues occur.