DAC cable CBO Q28-4S28-DAC-3M-CO-BL QSFP28 direct-attach copper, 3 m

Direct-attach copper (DAC) cable CBO Q28-4S28-DAC-3M-CO-BL is a 3 meter, high-speed twinax cable terminated with QSFP28 connectors. Engineered for short-reach connections between QSFP28 ports, this BlueOptics DAC offers a low-latency, energy-efficient physical link for switches, servers and storage systems in data center and rack environments. The fixed-length copper assembly eliminates the need for optical transceivers for short links while providing reliable electrical signal integrity at 100Gb/s class speeds.

Advantages

The CBO Q28-4S28-DAC-3M-CO-BL delivers predictable performance with minimal power consumption compared to active optical solutions. Its direct-attach design reduces system complexity and total cost for short distance interconnects. With a compact QSFP28 form factor and robust twinax construction, the cable provides stable signal transmission and a plug-and-play experience for compatible QSFP28 ports.

Suitable for

• Rack-to-rack connections inside data centers
• Switch uplinks and high-bandwidth switch-to-switch links
• Server-to-switch and storage-to-switch short-reach links

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 3 m
• Cable type: Twinax direct-attach copper (DAC)
• Data rate: Compatible with 100Gb/s QSFP28 interfaces
• Transmission: Short-reach electrical link optimized for rack environments
• Power: Passive copper assembly (low power consumption)

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your devices until the latch engages. Ensure compatible port configurations and link settings on switches or host adapters prior to use. For reliable operation, route the cable to avoid sharp bends and mechanical strain; observe the manufacturer’s minimum bend radius. The cable is intended for in-rack or short-distance interconnects and does not require separate transceivers or power.

Recommendations

Verify compatibility with your network equipment and firmware; confirm that QSFP28 ports support passive DACs. Avoid exceeding the specified bend radius, keep connectors free of dust, and handle the cable by the connector housings during installation and removal to maintain signal integrity and prolong service life.