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

Passive copper DAC cable CBO QSFP28-DAC-3M is a 3-meter direct-attach cable with QSFP28 connectors on both ends, designed for 100Gbps links in short-reach environments. The cable eliminates the need for separate optical transceivers by integrating QSFP28 plugs, delivering a compact, low-power connection between compatible network devices. It is intended for use in dense data center racks and switch-to-switch interconnects where predictable latency and cost-efficiency are priorities.

Advantages

The DAC cable offers low latency and reduced power consumption compared with optical links that require transceivers. Its passive copper construction provides stable signal integrity over short distances and simplifies installation by using plug-and-play QSFP28 connectors. The fixed 3 m length helps maintain predictable channel performance and reduces inventory complexity for standard short-reach links.

Suitable for

• Top-of-rack connections between switches and aggregation devices
• Switch-to-switch links within the same rack or adjacent racks
• Server to switch connections in high-density deployments
• Short-reach 100Gbps interconnects in data centers and network closets

Key specifications

• Connector type: QSFP28 on both ends
• Cable type: Passive copper direct-attach cable
• Nominal data rate: 100 Gbps
• Length: 3 meters
• Typical use case: Short-reach interconnects in racks and adjacent racks
• Compatibility: Designed for devices with QSFP28 ports

How to use

Install the DAC cable by aligning each QSFP28 connector with the corresponding port on the network devices and fully inserting until the latch engages. No transceivers or additional configuration are required; the link should be recognized by equipment that supports passive QSFP28 DACs. For reliable operation, ensure both endpoints support QSFP28 passive copper connections and verify link status through the device management interface after insertion.

Recommendations

For best performance, use the cable for connections up to 3 m within the same rack or adjacent racks, avoid tight bends and excessive strain on the cable, and keep QSFP28 connectors clean and protected when not in use. Confirm device compatibility and firmware support for passive DACs to ensure proper link negotiation and power management.