CBO DAC SFP28 passive direct attach copper cable 0.5 m Marconi SFP28-DAC-0.5M

The CBO DAC SFP28 passive direct attach copper cable 0.5 m Marconi SFP28-DAC-0.5M is a 0.5 meter passive SFP28 twinax cable designed for 25GbE SFP28 ports. It provides a short-reach, low-latency physical link between switches, network interface cards and servers in rack-mounted and data centre environments. The cable is plug-and-play, requires no external power or configuration, and is intended for high-density topologies where compact, reliable copper connections are needed.

Advantages

This passive SFP28 DAC cable delivers low latency and consistent signal integrity for short-distance 25GbE links while keeping power consumption minimal due to the passive design. Its compact 0.5 m length reduces cable clutter in dense rack installations and supports direct connections between adjacent ports or devices. The cable is mechanically compatible with standard SFP28 ports and supports hot-plug installation for quick maintenance or upgrades.

Suitable for

• Short-reach 25GbE links between switches
• Direct connections from NICs to servers
• Top-of-rack and leaf-spine data centre deployments
• High-density rack installations requiring compact cabling

Key specifications

• Interface: SFP28 form factor, compatible with 25GbE SFP28 ports
• Cable type: Passive twinax copper assembly
• Length: 0.5 meter
• Data rate: Supports 25 Gigabit Ethernet
• Latency: Low propagation delay suitable for short-reach links
• Power: Passive operation — no external power required
• Compatibility: Designed for direct attach use between switches, NICs and servers

How to use

Insert each SFP28 connector into compatible SFP28 ports on the devices to be linked until the latch engages. The cable is plug-and-play and should be recognised by standard switch and server SFP28 interfaces without additional configuration. For hot-plug operations, ensure the connected devices support hot insertion and monitor link status indicators to confirm an active 25GbE connection.

Recommendations

Use this 0.5 m passive DAC where short, direct, low-latency 25GbE connections are required. Avoid routing the cable through sharp bends and maintain bend radii recommended for twinax assemblies. For longer runs or when optical isolation is needed, consider active DACs or fiber transceivers as alternatives.