SFP28 DAC cable CBO SFP28-DAC-0.5M 0.5 m passive Direct Attach Copper for 25Gbps connections

Passive SFP28 DAC cable CBO SFP28-DAC-0.5M is a 0.5 metre Direct Attach Copper assembly designed for 25Gbps SFP28 ports. It provides a fixed copper connection between compatible switches, routers or network interface cards (NICs) without the need for separate optical transceivers. The cable is intended for short-reach interconnects such as rack-to-rack or top-of-rack links in data centres and enterprise networks, delivering low latency and reduced power consumption compared with active or optical modules.

Advantages

The direct-attach copper design offers predictable electrical performance and minimal signal conversion, reducing latency and energy use. At 0.5 m length the assembly minimises insertion loss and provides a reliable, low-cost connection that is simple to install and maintain. Passive construction eliminates onboard electronics, contributing to lower heat generation and straightforward compatibility with SFP28 ports that support passive DACs.

Suitable for

• Short-reach 25Gbps connections between adjacent racks
• Top-of-rack switching to aggregation switches
• Direct server-to-switch links using SFP28 ports
• Environments prioritising low latency and low power

Key specifications

• Connector type: SFP28 copper direct-attach
• Data rate: up to 25 Gbps per lane
• Length: 0.5 metre
• Cable type: passive twinax copper assembly
• Typical applications: short-reach server and switch interconnects
• Power consumption: passive, no active electronics

How to use

Insert each SFP28 connector into the corresponding SFP28 port on the devices to be linked until the latch clicks into place. Ensure both devices support passive direct-attach copper assemblies and that ports are configured for 25Gbps operation. No external power or transceiver configuration is required. For removal, press the connector latch and withdraw the cable straight out to avoid damaging the port.

Recommendations

For reliable performance, use this 0.5 m passive SFP28 DAC in short-reach scenarios only; avoid using it beyond intended rack-to-rack distances. Verify switch and NIC compatibility with passive DACs and consult device documentation for supported firmware or port settings before installation.