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

Passive copper direct-attach cable CBO SFP28-DAC-1M is a 1 m SFP28 cable engineered for short-reach 25Gb/s connections between compatible network devices. The cable provides a direct electrical interface without separate optical transceivers, offering low latency and reduced power consumption for high-density environments. It is intended for use in data centres and server rooms where cost-effective, fixed 25Gb/s links are required between switches, network interface cards and storage systems.

Advantages

This SFP28 passive copper DAC eliminates the need for separate transceivers, lowering both acquisition and operating costs. Its direct-attach design ensures minimal signal conversion and very low latency, making it suitable for latency-sensitive traffic. The short 1 m length supports rack-to-rack or adjacent-slot connectivity with a compact and robust form factor that simplifies cable management in dense installations.

Suitable for

• Short-reach 25Gb/s links between switches and routers
• Direct connections to NICs (Network Interface Cards)
• Interconnects between servers and storage arrays
• Rack-to-rack and adjacent-slot links in data centres
• High-density switch fabrics and top-of-rack deployments

Key specifications

• Interface: SFP28 to SFP28 direct-attach copper
• Data rate: 25 Gb/s per lane (aggregate 25 Gb/s link)
• Length: 1 metre
• Cable type: Passive copper twinax assembly
• Latency: Low, due to direct electrical connection
• Power consumption: Lower than active or optical transceiver-based links
• Compatibility: Designed for SFP28-enabled network ports supporting DAC modules

How to use

Insert each SFP28 connector into the corresponding SFP28 port on the network devices until the latch engages. Ensure both ends are securely seated and the devices are powered on. Verify link status via the devices' management interface or LEDs. No separate transceivers or optical modules are required; the cable establishes a direct electrical link when both ports support passive DACs.

Recommendations

For reliable operation, use the cable within its intended 1 m range and in environments matching the equipment’s specified operating conditions. Avoid excessive bending near the connector ends and maintain proper airflow in densely packed racks. Confirm compatibility with your switch or NIC vendor’s list of supported passive DACs if vendor lock-in or firmware checks are a concern.