Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-3M 3 m – QSFP28 to QSFP28, passive 3-meter interconnect

CBO QSFP28-DAC-3M is a 3-meter passive Direct Attach Copper (DAC) cable featuring QSFP28 connectors on both ends, engineered for short-reach high-speed interconnects between QSFP28 ports. The cable provides a direct copper connection for 100GbE links and is intended for server-to-switch and switch-to-switch connections within racks and data center topologies. As a passive solution, it eliminates the need for separate optical transceivers while offering low latency and predictable signal integrity for short-distance links.

Advantages

The passive QSFP28-DAC-3M delivers a cost-efficient alternative to fiber-based connections for short distances, reducing both purchase and operational expenses. Its fixed 3 m length simplifies cabling planning in rack environments and ensures consistent electrical characteristics without additional power consumption for active components. The QSFP28 connectors on both ends provide compatibility with standard QSFP28 ports and support typical 100GbE applications that require low latency and stable throughput.

Suitable for

• Short-reach 100 Gigabit Ethernet links within racks or between adjacent racks
• Direct server-to-switch or switch-to-switch interconnects in data centers
• High-density networking environments where low latency and predictable performance are required
• Cost-sensitive deployments that do not require optical transceivers

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive Direct Attach Copper (DAC)
• Length: 3 meters
• Supported link speed: 100 Gigabit Ethernet (100GbE)
• Typical use: short-reach interconnects within racks and between adjacent racks
• Latency: low, passive copper connection

How to use

Install the QSFP28-DAC-3M by inserting each QSFP28 connector firmly into the QSFP28 port on the networking devices to be linked. Ensure that devices are powered down or that hot-plug procedures recommended by the equipment manufacturer are followed when connecting or disconnecting to avoid port damage. After physical connection, verify link status through the device management interface and configure port settings (speed, lane mapping, and protocols) as required by the network design. No additional transceivers or fiber patching is necessary.

Recommendations

Use the cable within the specified rack and data center environments for distances up to 3 meters and avoid tight bends or mechanical stress near the connectors. Confirm QSFP28 port compatibility and supported 100GbE modes on both endpoints before deployment. For longer runs or where electrical isolation is required, consider optical transceivers and fiber cabling instead of passive DACs.