DAC cable CBO SFP28-DAC-0.5M 0.5 m passive copper SFP28 direct-attach

Passive copper DAC cable CBO SFP28-DAC-0.5M is a 0.5 metre direct-attach cable designed for SFP28 ports. It provides a short, low-latency physical connection between compatible network devices without the need for separate optical transceivers. The cable is intended for high-speed links where short reach, low power consumption and compact cabling are priorities, and is suitable for use between switches, network interface cards and storage systems that support SFP28.

Advantages

This passive SFP28 direct-attach cable offers a simplified physical layer connection that reduces component count and energy consumption compared with optical transceivers. Its short 0.5 m length minimises cable clutter in dense rack environments, and the copper construction delivers low latency and stable electrical performance for short-distance high-speed links. The cable is plug-and-play with SFP28-compatible ports and typically requires no additional configuration or power.

Suitable for

• Point-to-point connections between switches in the same rack or adjacent racks
• Direct links from servers or NICs to top-of-rack switches
• Interconnects for storage arrays and SAN equipment with SFP28 ports
• Short-reach data centre links where low latency and reduced power are required

Key specifications

• Connector type: SFP28 direct-attach (copper)
• Length: 0.5 metre
• Cable type: Passive twinax copper DAC
• Supported interface: SFP28 (25 Gbps per lane)
• Suitable reach: short-distance / in-rack or adjacent-rack connections
• Latency: low electrical latency suitable for high-performance links
• Power: passive design, no additional power required

How to use

Insert the SFP28 connectors into the SFP28 ports of the two devices to be connected, ensuring each connector latches securely. No additional transceivers, optical modules or external power are required. After physical installation, verify link status on the connected devices and check port configuration and speed settings if necessary. Use firmware or driver updates recommended by device manufacturers to ensure compatibility with passive SFP28 DACs.

Recommendations

Use this 0.5 m passive copper DAC for in-rack or adjacent-rack high-speed connections where optical modules are unnecessary. Avoid using the cable for longer runs beyond the recommended short-reach range. Handle connectors by the housing, avoid sharp bends in the cable, and keep contact dust-free when inserting or removing the cable to maintain reliable electrical performance.