DAC cable CBO BlueOptics DAC-Q28-S28-3M 3 m, 4x SFP28 direct-attach copper

CBO BlueOptics DAC-Q28-S28-3M is a 3 metre direct-attach copper (DAC) cable with four SFP28 connectors, engineered for short-range, high-bandwidth connectivity in data centre and enterprise network environments. It supports 25 Gigabit Ethernet links between SFP28 ports on switches, routers and servers, delivering a low-latency physical connection without the need for separate optical transceivers. The compact, factory-terminated design simplifies rack-to-rack and in-rack interconnects while reducing power consumption and total cost of ownership compared to active or optical cabling solutions.

Advantages

The cable offers a fixed, pre-terminated solution that eliminates the need for separate module purchases and fiber management. Its copper construction provides reliable electrical performance for short distances with minimal signal loss and latency. The integrated SFP28 connectors ensure compatibility with standard SFP28 ports and support line-rate 25GbE traffic. The robust shielding and stranded construction contribute to mechanical durability within cabling bundles and dense rack environments.

Suitable for

• 25 Gigabit Ethernet connections between switches and Top-of-Rack servers
• Short-range rack-to-rack interconnects within data centres
• High-density switching environments where cost and power consumption are critical
• Environments where optical transceivers are unnecessary or undesirable

Key specifications

• Cable type: direct-attach copper (DAC)
• Connector type: 4 × SFP28 integrated connectors
• Length: 3 metres
• Supported link speed: 25 Gigabit Ethernet
• Use case range: short-reach, intra-rack and rack-to-rack
• Construction: shielded copper assembly for EMI reduction

How to use

Install the DAC cable by inserting each SFP28 connector firmly into the corresponding SFP28 port on your network devices until the latch engages. Ensure devices are powered down or that hot-plug support is enabled and follow the equipment manufacturer’s guidance for hot-swapping. Verify link status and negotiate speed settings on both ends; in many setups the link will auto-negotiate to 25GbE. Route the cable to avoid sharp bends and excessive strain, and secure it within the rack to prevent connector stress during maintenance.

Usage recommendations

Use this DAC cable for reliable short-distance 25GbE links where low latency and lower power consumption are priorities. Avoid using beyond recommended lengths for passive copper DACs, and keep the cable within rack and cabinet environments to maintain signal integrity and mechanical life.