DAC SFP28 passive twinax cable CBO SFP28-DAC-2M 2 m for 25GbE SFP28 ports

BlueOptics DAC SFP28 passive twinax cable CBO SFP28-DAC-2M is a 2-meter direct attach copper assembly engineered for 25GbE SFP28 ports. It provides a direct, low-latency electrical link between compatible SFP28 ports on switches, routers and network interface cards without the need for optical transceivers. The cable is intended for short-reach connections inside data centers, server racks and network closets where reliable, cost-effective 25 Gigabit Ethernet links are required.

Advantages

The passive twinax design minimizes power consumption and latency compared with active or optical alternatives while maintaining high signal integrity for 25GbE connections. With a fixed 2 m length, the assembly removes the need for additional fiber transceivers and media conversion, reducing component count and deployment complexity. The cable is compatible with standard SFP28 port form factors and supports stable, repeatable electrical performance for dense rack-to-rack or server-to-switch links.

Suitable for

• Short-reach 25GbE connections between switches and top-of-rack or leaf switches
• Direct connections from servers to network interface cards supporting SFP28
• High-density rack environments requiring low-latency wired links
• Data center and enterprise aggregation or spine-leaf topologies for short distances

Key specifications

• Connector type: SFP28 electrical direct attach copper (twinax)
• Length: 2 meters
• Supported data rate: 25 Gigabit Ethernet (25GbE)
• Cable type: Passive twinax copper assembly
• Typical use case: Short-reach, in-rack or adjacent-rack links
• Power profile: Low power consumption (passive design)
• Form factor: SFP28-compatible plug-and-play assembly

How to use

Insert each SFP28 connector into the corresponding SFP28 port on the two devices to be linked, ensuring the connectors latch fully and the ports are powered. No additional configuration is required at the physical layer; most switches and NICs will detect the direct attach copper link automatically. Verify link status via device LEDs or management interfaces and confirm 25GbE link speed in the operating system or switch management console. For best results, route the cable within the rack to avoid sharp bends and keep it clear of active airflow paths.

Recommendations

Use this passive twinax cable for short, fixed-length connections where 25GbE speed and minimal latency are required. Avoid exceeding the specified 2 m length or subjecting the cable to repeated tight bends or tensile stress. Ensure port compatibility with passive SFP28 direct attach copper assemblies and consult device vendor documentation if link negotiation issues occur.