Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-3M 3 m Passive for QSFP28 ports

The BlueOptics CBO QSFP28-DAC-3M is a 3-meter passive Direct Attach Copper (DAC) cable designed for QSFP28 ports. It provides a short-reach physical connection for 100GbE and other QSFP28-supported interfaces without the need for separate transceivers. The cable is intended for low-latency, low-power interconnects inside racks or between adjacent racks, enabling direct switch-to-switch or switch-to-server links in data centre and high-density networking environments.

Advantages

This passive DAC cable offers plug-and-play installation and eliminates the cost and power consumption associated with optical transceivers. The fixed copper assembly provides predictable latency and reliable electrical performance for short-reach connections. With an industry-standard QSFP28 form factor, the cable is compatible with equipment that supports QSFP28 copper direct-attach links, simplifying deployment in top-of-rack and middle-of-row configurations.

Suitable for

• Short-reach 100 Gigabit Ethernet links within a rack
• Switch-to-switch interconnects in data centres
• Switch-to-server connections where QSFP28 ports are available
• High-density rack deployments requiring low-latency cabling

Key specifications

• Length: 3 m
• Cable type: Passive Direct Attach Copper (DAC)
• Connector type: QSFP28 to QSFP28
• Supported interface: 100GbE and other QSFP28-supported protocols
• Typical use: Short-reach intra-rack or adjacent-rack connectivity
• Power profile: Passive, no active electronics in the cable

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your networking devices, ensuring the connectors are fully engaged and the module latches if present. Ensure both devices recognise QSFP28 copper links and are configured for the intended speed and interface. No additional optics or transceiver modules are required; the cable functions as a direct electrical connection for supported link speeds. Inspect connectors for debris before installation and avoid excessive bending or tension on the cable during routing.

Recommendations

Use this 3 m passive DAC cable for short-distance links inside the same rack or between adjacent racks. Avoid using passive copper DACs for runs longer than the recommended 3 m and verify device compatibility with QSFP28 copper connections to ensure proper link negotiation and performance.