DAC cable CBO QSFP28-DAC-3M 3 m QSFP28 direct-attach copper cable for 100GbE

CBO QSFP28-DAC-3M is a 3 m direct-attach copper (DAC) cable with QSFP28 connectors engineered for 100 Gigabit Ethernet links. Designed for short-reach interconnects in data centers, switches and servers, the cable offers a direct copper connection between QSFP28 ports that simplifies rack-level cabling and reduces power consumption compared to optical transceivers. It is compatible with Chelsio systems and other devices that accept standard QSFP28 DAC assemblies, providing a stable physical layer for high-throughput, low-latency links.

Advantages

The DAC cable provides a low-latency, low-power alternative to optical modules for short distances and eliminates the need for separate transceivers and patch optical cables. With a fixed 3 m length and QSFP28 connectors at both ends, it ensures predictable signal integrity and straightforward installation in adjacent racks or within the same rack. The copper construction reduces overall system cost and heat dissipation while delivering the bandwidth required for 100GbE connections.

Suitable for

• Short-reach 100 Gigabit Ethernet links between switches and top-of-rack devices
• Adjacent rack or within-rack connections in data centers
• Server-to-switch interconnects where QSFP28 ports are available
• High-density rack cabling scenarios requiring low power and low latency

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable length: 3 meters
• Supported data rate: 100 Gigabit Ethernet
• Medium: Direct-attach copper (DAC)
• Typical use: Short-reach, rack-level interconnects
• Latency: Low, suitable for latency-sensitive applications

How to use

Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port on the network devices until the connector latches. Ensure both devices support QSFP28 DAC connectivity and that ports are configured for 100GbE operation. Route the cable to avoid sharp bends and mechanical stress; maintain minimum bend radius as recommended by the equipment vendor. After physical installation, verify link status and perform any required interface configuration on the connected devices.

Recommendations

Use this 3 m DAC cable for short-distance connections within the same rack or between adjacent racks to maximize cost and power efficiency. Avoid using it for long-reach links; for distances beyond rack-level interconnects, consider optical transceivers and fiber. Handle connectors by the housing to prevent damage and store the cable in a dry, dust-free environment when not in use.