DAC cable CBO QSFP28-DAC-2M 2m Passive Copper QSFP28 to QSFP28

The CBO QSFP28-DAC-2M 2m Passive Copper DAC cable is a 2-metre direct attach copper solution with QSFP28 connectors on both ends designed for 100Gbps links. It connects QSFP28 ports in servers, switches or network appliances within racks or across short-distance data centre topologies. As a passive copper assembly, it eliminates the need for separate optical transceivers and provides a straightforward, low-latency electrical connection for short reach 100G applications.

Advantages

This passive DAC cable offers a cost-effective alternative to active optics for short-range 100Gbps interconnects by combining integrated QSFP28 connectors with a fixed copper assembly. It delivers low latency and stable electrical performance without the power and heat penalties of active modules. Installation is simplified because no additional transceivers are required, and the fixed-length cable reduces points of failure and inventory complexity in dense rack deployments.

Suitable for

• Short-reach 100Gbps server-to-switch connections within a rack
• Switch-to-switch interconnects across adjacent racks or within the same data hall
• High-density top-of-rack deployments where space, power and cooling are constrained
• Environments where deterministic low latency is required for storage or compute clusters

Key specifications

• Connector type: QSFP28 to QSFP28, integrated
• Length: 2 metres (fixed)
• Transmission medium: Passive twinax copper
• Rated data rate: 100 Gbps
• Latency: electrical, minimal added latency compared with optical transceivers
• Power: passive (no external power required)
• Typical use case: short-reach interconnects in data centre and enterprise networks

How to use

Install the cable by inserting each QSFP28 connector into the corresponding port on the devices until the latch engages. Ensure both devices support passive QSFP28 direct attach copper connections and that ports are configured for 100Gbps operation if required. Route the 2m cable to avoid sharp bends and mechanical strain; maintain the manufacturer’s minimum bend radius and secure the cable to reduce movement in dense server racks. No transceiver configuration is necessary beyond standard interface settings on the network devices.

Recommendations

Use this passive DAC for rack-level or adjacent-rack 100G links where distance does not exceed the fixed 2m length. Avoid exposure to excessive mechanical stress, moisture, or temperatures outside typical data centre ranges. Verify device compatibility with passive QSFP28 cables before deployment and follow standard hot-plug procedures when inserting or removing the cable to protect ports and connectors.