Direct Attach Copper (DAC) SFP28 1m passive cable, CBO SFP28-DAC-1M

CBO SFP28-DAC-1M is a 1-meter passive Direct Attach Copper (DAC) SFP28 cable engineered for short-reach 25GbE connectivity. It creates a direct copper link between two SFP28 ports, enabling plug-and-play installation for switches, servers and network appliances without separate optical transceivers. The cable is intended for cost-efficient, low-latency interconnects in data center top-of-rack and server-to-server deployments where short distance, high-bandwidth links are required.

Advantages

The passive DAC design offers low power consumption and minimal latency compared with active optical solutions. Its one-piece copper construction reduces component count and simplifies installation, while the SFP28 form factor ensures compatibility with standard 25GbE SFP28 ports. The fixed 1 m length is suitable for compact rack layouts and short-path connections, providing a reliable, maintenance-free physical link for high-throughput applications.

Suitable for

• Top-of-rack switch to server connections in data centers
• Server-to-server links within the same rack or adjacent racks
• High-bandwidth, low-latency short-reach interconnects
• Switch stacking or uplink connections over short distances

Key specifications

• Interface: SFP28 to SFP28
• Rated data rate: 25 Gigabit Ethernet (25GbE)
• Cable type: Passive twinax copper assembly
• Length: 1 meter
• Power: Passive operation (no external power required)
• Latency: Low electrical latency suitable for high-performance networking
• Form factor: SFP28 connector housing

How to use

Install the cable by inserting each SFP28 connector into the corresponding SFP28 port on the devices until the latch engages. No additional configuration or transceiver modules are required; devices typically recognize the link automatically and negotiate the 25GbE connection. For optimal performance, ensure both endpoints support 25GbE over SFP28 and that the cable length fits the intended rack or chassis layout.

Recommendations

Use the DAC cable for short-distance links inside racks or between adjacent racks. Avoid tight bends and excessive pulling; maintain manufacturer-recommended bend radius and secure the cable to prevent mechanical stress. Verify compatibility with device firmware and port settings before deployment, and consider environmental factors such as airflow and temperature in dense installations.