DAC cable CBO SFP28-DAC-0.5M 0.5m Passive Copper — SFP28 direct-attach copper, 0.5 m

Passive 0.5 m DAC cable CBO SFP28-DAC-0.5M is a direct-attach copper (twinax) cable designed for SFP28 ports and short-reach 25GbE connections. The cable provides a low-latency, low-power alternative to optical transceivers for connecting switches, servers and other network equipment inside racks or between adjacent racks. Its fixed 0.5 m length and SFP28 connectors enable plug-and-play installation for data center and enterprise environments that require a compact and reliable copper link.

Advantages

This passive DAC cable offers minimal signal conversion overhead and reduced power consumption compared with active optics. The twinax copper construction delivers low latency and consistent electrical performance over short distances. Its standardized SFP28 connectors ensure broad compatibility with equipment that supports SFP28 direct-attach copper, while the short fixed length reduces clutter and simplifies cable management in dense rack deployments.

Suitable for

• Short-reach 25GbE connections between top-of-rack switches and servers
• Rack-to-rack links in adjacent cabinets
• High-density data center interconnects where low latency is required
• Environments seeking lower power consumption and reduced heat compared with active optical modules

Key specifications

• Interface: SFP28 to SFP28
• Data rate: 25 Gigabit Ethernet
• Length: 0.5 m (fixed)
• Cable type: Passive twinax copper
• Latency: low electrical latency suitable for short links
• Power: passive design with lower power draw than active optical transceivers
• Usage environment: suitable for data center and rack installations

How to use

Install the DAC cable by inserting each SFP28 connector into the appropriate SFP28 port on your switches, servers or network devices until the connector latches. No additional configuration or transceiver modules are required for basic link operation; the cable operates as a direct-attach copper connection. Verify link status on connected devices and confirm negotiated speed of 25GbE where supported. Use device documentation to enable or check port settings if the link does not come up automatically.

Recommendations

Use the cable for short, intra-rack or adjacent-rack connections up to 0.5 m; avoid routing it through long cable runs. Ensure compatible SFP28 ports and firmware support on both endpoints for optimal performance. Protect connectors from dust when not in use and avoid sharp bends near the connector to maintain signal integrity.