CBO QSFP28 Passive Direct Attach DAC Cable 0.5 m

The CBO QSFP28 Passive Direct Attach DAC Cable 0.5 m is a fixed copper assembly designed for short-reach 100GbE connections using QSFP28-compatible ports. This 0.5 metre passive DAC provides a direct electrical link between switches, servers and storage devices without active signal conditioning, offering low latency and energy-efficient operation for high-density data centre environments and top-of-rack interconnects.

Advantages

This passive QSFP28 DAC delivers predictable performance with minimal signal processing, reducing power consumption compared with active optics. Its compact, low-profile design supports dense port layouts and simplifies cabling in rack deployments. The fixed 0.5 m length eliminates the need for field termination and reduces potential points of failure, while copper construction provides cost-effective connectivity for short-distance 100GbE links.

Suitable for

• Top-of-rack connections between switches and servers in data centres
• High-density rack environments with short interconnect distances
• Direct server-to-switch or switch-to-switch 100GbE links
• Environments where low latency and reduced power consumption are priorities

Key specifications

• Interface: QSFP28 to QSFP28 passive copper assembly
• Supported link class: 100 Gigabit Ethernet (100GbE)
• Length: 0.5 metres
• Passive operation: no active signal conditioning or power draw from the cable
• Form factor: compact, low-profile QSFP28 connector housings for high-density ports
• Usage environment: designed for short-reach intra-rack or adjacent-rack connections

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the networking equipment until the connector latch engages. Ensure both ends are fully seated and the devices are powered according to their manufacturer instructions. Verify link status on connected devices and configure network interfaces as required for 100GbE operation. For best results, use the cable for short-reach links within racks or between adjacent racks and avoid routing through pathways that may introduce sharp bends or physical strain.

Recommendations

Inspect connectors for debris before installation and avoid excessive bending or pulling on the cable. Use this passive DAC for distances up to the specified 0.5 m and verify compatibility with the host devices’ QSFP28 ports and firmware. For longer distances or where active signal conditioning is required, consider optical transceivers or active DAC alternatives.