CBO SFP28 Direct Attach Copper (DAC) Cable SFP28-DAC-0.5M, 0.5 m Passive

Passive CBO SFP28 Direct Attach Copper (DAC) Cable SFP28-DAC-0.5M, 0.5 m Passive is a short-reach copper interconnect designed for SFP28 ports to deliver 25GbE connectivity between switches, NICs and servers. This 0.5 metre plug-and-play cable removes the need for separate transceivers and is intended for low-latency, cost-effective links inside racks or between adjacent devices in data centre environments.

Advantages

The cable provides a low-latency electrical connection with minimal power consumption because it is a passive design. Its fixed 0.5 m length reduces signal degradation and is well suited for top-of-rack and short aggregation connections. Being a direct-attach solution, it simplifies installation with no configuration or additional transceivers required, and it typically offers a lower total cost compared with optical alternatives for equivalent short distances.

Suitable for

• Top-of-rack switch to server connections in data centres
• Inter-switch short links within the same rack or adjacent racks
• Server NIC aggregation and high-performance computing clusters requiring 25GbE
• Environments where low latency and low power are priorities

Key specifications

• Interface: SFP28 electrical direct attach copper
• Nominal data rate: 25 Gigabit Ethernet (25GbE)
• Length: 0.5 metres (fixed)
• Design: Passive (no active components or power required)
• Connector type: SFP28 form factor plugs on both ends
• Application: Short-reach rack and server interconnects

How to use

Install the cable by inserting each SFP28 plug into the corresponding SFP28 port on the devices to be connected, ensuring proper seating and latch engagement. No transceivers, configuration changes or additional drivers are required for standard SFP28 host interfaces; the link should negotiate at 25GbE or fall back according to device capabilities. For reliable operation, verify that the switch and server NIC support passive SFP28 DAC cables and check port status LEDs or management interfaces after insertion.

Recommendations

Use this 0.5 m passive DAC cable for short, intra-rack connections where 25GbE performance and low latency are required. Avoid routing the cable through high-heat or high-electrical-noise areas and do not bend the cable sharply at the connector to preserve signal integrity and mechanical reliability.