DAC cable CBO QSFP28-DAC-0.5M 0.5m passive copper QSFP28 to QSFP28

Passive copper DAC cable CBO QSFP28-DAC-0.5M is a 0.5 m direct-attach cable designed to connect QSFP28 ports directly between compatible network devices. The cable supports short-reach, high-density interconnects for data center top-of-rack, switch-to-switch and server-to-switch links, offering low latency and minimal power consumption compared with active optical modules. The compact construction and fixed length simplify cabling in confined racks and reduce the need for transceivers.

Advantages

This DAC cable provides a reliable, low-latency physical link with minimal power overhead and reduced heat generation compared with active optics. Its passive copper construction eliminates the need for separate transceivers, lowering total cost of ownership for short-distance connections. The 0.5 m length reduces signal attenuation and is suitable for closely spaced equipment, while the QSFP28 form factor maintains compatibility with devices that support QSFP28 ports.

Suitable for

• Short-reach interconnects between switches in top-of-rack deployments
• Direct server-to-switch connections in high-density racks
• Switch-to-switch links within the same rack or adjacent racks
• Environments where low latency and low power consumption are required

Key specifications

• Form factor: QSFP28 to QSFP28 connector
• Length: 0.5 m (fixed)
• Medium: passive copper twinax
• Data rate compatibility: designed for 100 Gbps QSFP28 links (backward compatibility depends on device support)
• Typical use: short-reach, direct-attach cabling inside racks

How to use

Install by inserting each QSFP28 connector into the corresponding QSFP28 port on the devices until the latch engages. Ensure both devices support DAC direct-attach connections and the required data rate. Do not bend the cable sharply; maintain gentle curves to avoid stress on the connectors and conductors. For removal, release the connector latch and pull straight out to avoid damaging port pins.

Recommendations

Use this 0.5 m passive DAC cable for short, high-bandwidth links inside racks or between adjacent racks. Verify compatibility with the network equipment vendor's QSFP28 port policies; keep ambient temperature and airflow within equipment specifications to ensure reliable operation.