DAC cable CBO QSFP28-DAC-0.5M 0.5m Direct Attach QSFP28 passive copper

CBO QSFP28-DAC-0.5M is a 0.5 m Direct Attach copper cable with QSFP28 connectors designed for short-range high-speed links. It provides a low-latency, energy-efficient connection for 100GbE and other QSFP28-capable equipment in data center environments. The cable is intended for short interconnects such as server-to-switch and switch-to-switch links within racks or between adjacent racks where a compact, passive copper solution is appropriate.

Advantages

The passive QSFP28 direct attach cable offers low power consumption compared with active optical modules and eliminates the need for transceivers at each end, reducing overall system cost. Its short length and fixed copper construction minimise signal attenuation and latency, delivering reliable 100GbE performance for rack-level connectivity. The cable’s small form factor simplifies cable management in dense installations and reduces airflow obstruction inside server racks.

Suitable for

• Server-to-switch connections in the same rack
• Top-of-rack (ToR) switch uplinks to adjacent switches
• High-density patching between equipment in data centres
• Short-range 100GbE links where passive copper is acceptable

Key specifications

• Cable type: Direct Attach Copper (DAC), passive
• Connector type: QSFP28 to QSFP28
• Length: 0.5 m
• Data rate: suitable for 100 Gigabit Ethernet
• Application: short-range, rack-level interconnects

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on network equipment until the latch engages. Ensure both ends are properly seated and locked before powering the systems. Route the cable to avoid sharp bends and excessive tension; maintain the minimum bend radius recommended by the equipment manufacturer. For best results, use this 0.5 m direct attach cable for connections within the same rack or between adjacent racks to preserve signal integrity and minimise latency.

Recommendations

Verify compatibility of QSFP28 ports on both devices before installation and confirm that ports support passive DACs. Keep the cable clear of power supplies and hot airflow paths, and replace the cable if the connector latches or the copper jacket show physical damage.