Passive SFP28 DAC cable CBO SFP28-DAC-1M 1 m, copper direct-attach for 25GbE ports

CBO SFP28-DAC-1M is a 1 metre passive SFP28 direct-attach copper cable engineered for 25 Gigabit Ethernet links. The cable connects SFP28 ports on switches, servers or network interface cards to provide a fixed, low-latency physical connection without separate optical transceivers. Its compact, single‑cable form factor simplifies short-reach rack-to-rack or within-rack interconnects and reduces power consumption compared with active optical solutions.

Advantages

This passive SFP28 DAC cable delivers low latency and predictable performance for short-distance 25GbE links while eliminating the need for separate transceiver modules. The direct-attach copper design offers plug-and-play installation, lower power draw, and a reduced total cost of ownership for high-density deployments. A 1 m length provides a tidy cable path for adjacent equipment and minimizes signal attenuation typical of longer copper runs.

Suitable for

• Short-reach connections between top-of-rack switches and servers
• Within-rack uplinks and aggregation ports
• High-density switch-to-switch interconnects in data centre racks
• Server NIC to switch links in compute clusters

Key specifications

• Interface: SFP28 to SFP28
• Data rate: 25 Gigabit Ethernet
• Construction: Passive copper direct-attach cable
• Length: 1 metre
• Form factor: Twinax direct-attach with SFP28 connectors
• Typical use distance: short-reach (within rack or adjacent racks)

How to use

Insert one SFP28 connector into the SFP28 port of the first device and the other connector into the SFP28 port of the second device until each latch clicks into place. Ensure both devices are powered and that their ports support passive DAC connections at 25GbE. No additional modules, fibre patching, or configuration is typically required beyond verifying link speed and port settings in the switch or server management interface.

Recommendations

Use the cable for short, direct connections inside racks or between adjacent racks. Avoid tight bends and excessive force on the connectors; maintain a minimum bend radius consistent with twinax cabling and keep the cable away from sources of electromagnetic interference. Verify compatibility with device firmware and port auto-negotiation settings before deployment.