Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-3M 3 m compatible with QSFP28 ports

Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-3M is a 3-meter passive twinax cable designed for direct connection between devices equipped with QSFP28 ports. Engineered for short-reach, high-bandwidth links, this DAC cable supports 100GbE interconnects while delivering low latency and predictable performance. The fixed-length copper assembly is suitable for data center topologies where cost efficiency and power savings are priorities compared with active optical solutions.

Advantages

The QSFP28-DAC-3M provides a low-cost and power-efficient option for 100GbE short-reach connections. Its passive twinax design ensures minimal latency and consistent signal integrity across the 3 m span. The fixed, factory-terminated cable simplifies installation and reduces the need for transceivers, lowering overall system complexity. Compatible with equipment that accepts QSFP28 form-factor copper assemblies, it offers a durable, rack-friendly interconnect for dense networking environments.

Suitable for

• Switch-to-switch links within the same rack or adjacent racks
• NIC-to-switch connections for servers requiring 100GbE bandwidth
• Server uplinks and aggregation in data center top-of-rack deployments
• High-bandwidth, short-distance connections where low latency is required

Key specifications

• Length: 3 meters
• Connector type: QSFP28 to QSFP28 (direct attach copper)
• Cable type: Passive twinax copper
• Supported data rate: 100 Gigabit Ethernet (100GbE)
• Typical use: Short-reach, intra-rack and adjacent-rack interconnects
• Form factor: QSFP28 compatible

How to use

Ensure both devices have QSFP28 ports rated for passive copper assemblies before installation. With power to the devices off or in a safe maintenance state, align each QSFP28 connector with the port and insert until the retention mechanism engages. After physical connection, power on the devices and verify link negotiation and interface status in the network equipment management tools. Monitor link indicators and system logs to confirm stable 100GbE operation. For removal, follow vendor guidance to disengage the retention mechanism and withdraw the connector carefully to avoid damage to ports.

Recommendations

Use this 3 m DAC cable for short-distance, high-bandwidth links inside racks or between adjacent racks. Maintain bend radius and avoid tight kinks; keep the cable clear of airflow obstructions and high-heat sources. Confirm compatibility with your switch or NIC vendor compatibility lists where applicable and verify link behavior after installation.