DAC cable CBO QSFP28-DAC-0.5M 0.5 m passive copper QSFP28 direct attach

Passive copper DAC cable CBO QSFP28-DAC-0.5M is a 0.5 meter direct-attach solution designed for QSFP28 ports. The cable provides a short-distance, low-latency electrical connection between network devices such as switches, servers and network interface cards without requiring separate optical transceivers. It supports 100G links in dense rack environments where space, power efficiency and predictable performance are priorities.

Advantages

This passive QSFP28 direct attach cable offers a compact form factor and low power consumption compared with optical modules and active cables. The 0.5 m length minimizes signal attenuation for short-reach links, simplifies cabling in high-density setups and reduces per-port connectivity cost. Compatibility with standard QSFP28 ports ensures straightforward deployment and reliable 100G throughput for server-to-switch and switch-to-switch connections.

Suitable for

• Short-reach 100G connections within the same rack or adjacent racks
• High-density data centre top-of-rack and end-of-row interconnects
• Direct server-to-switch or switch-to-switch links requiring low latency
• Cost-sensitive deployments where optical transceivers are unnecessary

Key specifications

• Connector type: QSFP28 to QSFP28 passive copper direct attach
• Length: 0.5 m
• Data rate: designed for 100 Gigabit Ethernet links
• Cable medium: twinaxial copper assembly
• Latency: low-latency electrical connection suitable for short distances
• Power: passive design requires no external power or signal conditioning

How to use

Install the cable by inserting each QSFP28 connector into the corresponding port on the devices to be connected, ensuring correct orientation and full seating until the retention mechanism engages. No additional configuration or transceiver modules are required. Verify link status on connected devices and confirm 100G negotiation where applicable. For best signal integrity, route the cable without sharp bends and avoid excessive tension or compression.

Recommendations

Use this 0.5 m passive DAC cable for short, high-density interconnects inside racks. Avoid using the cable for distances beyond its intended short-reach range and keep the assembly free from kinks and tight bends to maintain performance. If optical reach, longer distances, or active signal conditioning are required, choose an appropriate optical transceiver or active cable alternative.