CBO DAC Cable QSFP28-DAC-0.5M 0.5m Passive Copper direct-attach cable QSFP28

The CBO DAC Cable QSFP28-DAC-0.5M is a 0.5 metre passive copper direct-attach cable designed for QSFP28 ports. It provides a fixed short-reach electrical connection between compatible network devices such as switches, routers and servers with QSFP28 interfaces. The cable supports high-density rack deployments and low-latency links where a reliable, short copper connection is preferred over optical transceivers.

Advantages

This passive DAC cable offers low latency and deterministic signal behaviour thanks to its direct copper connection. Its short 0.5 m length reduces cable management complexity in high-density racks and helps maintain airflow and neat patching. The integrated QSFP28 connectors require no separate transceivers, which simplifies deployment and reduces power consumption compared to active optics. The construction delivers a durable, fixed-link solution suitable for stable short-reach interconnects.

Suitable for

• Short-reach links between QSFP28-equipped switches in the same rack or adjacent racks
• Server-to-switch connections in high-density data centre environments
• Top-of-rack interconnects where low latency and compact cabling are required

Key specifications

• Interface type: QSFP28 to QSFP28 passive direct-attach copper
• Cable length: 0.5 m
• Form factor: Fixed twin-ax copper assembly with integrated connectors
• Data rate compatibility: Designed for 100Gbps QSFP28 links (backward compatibility depends on host equipment)
• Use case: Short-reach, within-rack or adjacent-rack connections

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the network devices until the connector latch engages. Ensure both devices are powered and that their ports are configured for the intended link speed and mode. No additional transceivers, drivers, or external power are required for the passive cable itself. For proper cable routing, avoid sharp bends and secure the cable to prevent strain on the connectors.

Recommendations

Verify compatibility with the host devices' QSFP28 ports and supported cable types before installation. Use the 0.5 m passive DAC for within-rack or adjacent-rack connections where short, low-latency links are needed. Maintain appropriate bend radius and avoid placing the cable under tension to preserve signal integrity and connector longevity.