DAC cable CBO SFP28-DAC-0.5M 0.5 m passive copper SFP28 to SFP28

CBO SFP28-DAC-0.5M is a 0.5 m passive copper direct attach cable with SFP28 connectors on both ends, designed for short-reach 25GbE interconnects. It provides a low-latency, low-power physical link between switches, servers and network interface cards without requiring external transceivers or additional power. The compact, fixed-length construction simplifies rack cabling in data centres and server rooms where reliable high-speed links are needed over short distances.

Advantages

The passive copper design offers cost-effective connectivity with minimal power consumption and very low latency compared to optical transceivers. SFP28 connectors on both ends ensure compatibility with 25GbE ports that accept SFP28 direct attach cables. The short 0.5 m length reduces signal degradation and crosstalk in dense rack environments, and the fixed assembly eliminates the need to manage separate transceivers and patch cords.

Suitable for

• Short-reach 25GbE links between switches in the same rack or adjacent racks
• Direct connections from servers to top-of-rack switches
• Interconnects between network interface cards (NICs) and switch ports
• High-density cabling scenarios in data centres and server rooms

Key specifications

• Connector type: SFP28 to SFP28 (both ends)
• Length: 0.5 m (fixed)
• Cable medium: passive copper twinax
• Data rate: supports 25 Gigabit Ethernet (25GbE)
• Latency: low-latency direct attach design
• Power: passive, requires no external power or transceivers
• Operating environment: intended for rack and short-reach data centre use

How to use

Insert each SFP28 connector into the corresponding 25GbE SFP28 port until it latches. Ensure compatible ports are used and that devices are powered according to their manufacturer instructions. No separate transceivers or power sources are required for the cable to operate. After installation, verify link status and negotiated speed on connected devices and adjust interface settings if necessary.

Recommendations

Use this 0.5 m passive DAC cable for direct, short-distance connections inside racks or between adjacent racks where 25GbE links are needed. Avoid running the cable across long distances or in environments with excessive electromagnetic interference. Handle connectors by their housings and avoid bending the cable sharply to maintain signal integrity.