CBO SFP28 passive copper DAC cable SFP28-DAC-1M 1 m, direct-attach for 25Gb/s ports

Passive CBO SFP28-DAC-1M is a 1 m direct-attach copper cable engineered for SFP28 ports and 25Gb/s links. The fixed-length twinax assembly provides a point-to-point connection between switches, network interface cards and servers for short-reach topologies within racks or between adjacent racks. As a passive direct-attach cable, it requires no additional power for signal conversion and offers a compact, low-latency option for dense 25Gb Ethernet interconnects.

Advantages

The cable delivers predictable, low-latency performance with minimal power consumption compared with optical transceivers. Its one-meter length simplifies rack cabling and reduces clutter while maintaining signal integrity for short runs. The direct-attach form factor eliminates the need for separate transceivers and reduces total component count, which can lower equipment and operational costs in high-density environments.

Suitable for

• Short-reach connections between top-of-rack switches and servers
• Interconnects between adjacent racks in data centres
• High-density 25Gb Ethernet aggregation and leaf-spine fabrics
• Server NIC to switch direct links where 1 m length is sufficient

Key specifications

• Connector type: SFP28 direct-attach twinax
• Cable length: 1 metre
• Data rate: supports up to 25 Gb/s per channel
• Type: passive copper (no active signal conditioning)
• Use case: short-reach, within-rack or adjacent-rack interconnects

How to use

Install the cable by inserting each SFP28 end into the corresponding port on the switch, server or NIC until the connector latch clicks into place. Ensure devices are powered off or follow hot-plug guidelines provided by the equipment manufacturer when connecting or disconnecting. Verify link status and speed through the host or switch management interface after insertion. For reliable operation, route the cable to avoid sharp bends and excessive strain.

Recommendations

Use this passive 1 m DAC for short, high-density 25Gb links where power efficiency and minimal latency are priorities. Avoid exceeding manufacturer-recommended bend radius and keep connections within a single rack or between adjacent racks to maintain signal integrity. Confirm SFP28 compatibility with your network equipment before deployment.