Passive SFP28 DAC copper cable CBO 0.5 m for 25GbE connections

Passive SFP28 DAC copper cable CBO 0.5 m for 25GbE connections is a factory-terminated direct-attach cable designed to provide a short-range, low-latency electrical link between SFP28 ports. Manufactured by BlueOptics, this 0.5 metre assembly connects 25GbE-compatible switches, servers and network interface cards without the need for separate transceiver modules, offering a compact and energy-efficient solution for high-density rack environments.

Advantages

The direct-attach nature of this passive SFP28 cable eliminates the cost and power consumption associated with active optics or separate transceivers while delivering deterministic latency and stable signal integrity over short distances. Its fixed 0.5 m length reduces cable clutter in dense racks and simplifies cable management. The cable is suited for plug-and-play installation and is compatible with standard SFP28 port form factors, enabling immediate connectivity between compatible devices.

Suitable for

• Rack-to-rack connections in data centers
• Interconnects between switches and top-of-rack devices
• Server-to-switch links for 25GbE NICs
• Short-reach links inside network chassis or appliances

Key specifications

• Interface: SFP28 to SFP28 electrical direct-attach cable
• Rated data rate: 25 Gbps per lane (25GbE link)
• Length: 0.5 metre
• Cable type: Passive copper twinax assembly
• Latency: low, suitable for short-range high-performance links
• Form factor compatibility: SFP28 port form factor on switches, servers and NICs

How to use

Insert each SFP28 connector end into the corresponding SFP28 port on the devices to be linked until the latch engages. Ensure both ports are designed for 25GbE operation and are powered down or follow hot-swap guidance from the equipment manufacturer if available. After insertion, verify link status through the device management interface or LED indicators and confirm negotiated link speed and duplex settings. For removal, press the release mechanism and pull the connector straight out to avoid damaging the port.

Recommendations

Use this passive DAC for short-distance fixed connections up to 0.5 m inside racks or between adjacent racks. Avoid excessive bending near the connector ends and maintain clearance to prevent strain on the cable. Verify firmware or vendor compatibility if devices enforce vendor-specific transceiver validation.