DAC Cable CBO QSFP28-DAC-3M 3 m Passive Direct Attach Twinax for QSFP28 ports

CBO QSFP28-DAC-3M is a 3-meter passive Direct Attach Twinax cable with QSFP28 connectors, engineered for short-reach 100GbE links between devices that support QSFP28 ports. The cable delivers a low-latency copper connection suitable for top-of-rack, switch-to-switch and server interconnects in data center environments where cost efficiency and compact cabling are priorities.

Advantages

The passive twinax construction offers a reliable, energy-efficient link without active signal conditioning, reducing power consumption and simplifying deployment. At 3 meters length it provides flexible routing within racks and between adjacent racks while maintaining signal integrity for 100 Gbit/s links. QSFP28 connectors ensure compatibility with equipment that accepts QSFP28 interfaces and enable plug-and-play installation.

Suitable for

• Top-of-rack connections in data centers
• Switch-to-switch interconnects over short distances
• Server to switch uplinks where QSFP28 ports are available
• High-density rack deployments requiring compact copper cabling

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive twinax copper
• Supported data rate: up to 100 Gbit/s
• Length: 3 m
• Typical use: short-reach interconnects in data center environments

How to use

Insert each QSFP28 connector firmly into the matching QSFP28 port on the devices to be connected. Ensure devices are powered down or follow hot-plugging guidelines from your hardware vendor before insertion or removal. Route the cable to avoid sharp bends and excessive tension; maintain the specified bend radius to preserve performance. After physical installation, verify link status in the network equipment management interface and confirm negotiated speed and link integrity.

Recommendations

Use passive DACs like this for short copper runs where cost and low latency are priorities; for longer distances consider active optical options. Keep the cable free from kinks, and avoid bundling with high-heat sources. Confirm compatibility with your hardware vendor’s QSFP28 port specifications to ensure proper link negotiation.