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

Passive copper DAC cable CBO QSFP28-DAC-0.5M is a 0.5 m direct-attach cable with QSFP28 connectors designed for short-reach 100GbE interconnections. The cable provides a fixed, low-latency link between QSFP28 ports without the need for separate optical transceivers, making it suitable for dense rack-to-rack or within-rack topologies in data centers and high-performance networking equipment.

Advantages

The passive QSFP28 direct-attach cable offers low power consumption since no active transceiver electronics are required, and it delivers minimal latency for latency-sensitive applications. Its robust copper construction ensures reliable electrical performance over short distances, and the integrated QSFP28 connectors simplify installation and reduce component count in network racks. The short 0.5 m length minimizes signal attenuation and cross-talk in dense deployments.

Suitable for

• Short-reach 100GbE links between switches and routers within a rack
• Top-of-rack to aggregation switch connections in data centers
• High-performance computing clusters requiring low-latency interconnects
• Cable management scenarios where compact, fixed-length connections are preferred

Key specifications

• Connector type: QSFP28 on both ends
• Length: 0.5 m
• Media: passive copper direct-attach
• Supported link rate: 100 Gigabit Ethernet
• Latency: minimal electrical latency suitable for short-reach links
• Power: no additional power required for transceivers
• Form factor: compact, low-profile QSFP28 assembly

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on your network devices until the latch engages. Ensure both ports support passive DAC connections and the devices are configured for 100GbE operation. Route the 0.5 m cable to avoid sharp bends and maintain proper airflow in the rack. No additional configuration is required at the physical layer beyond verifying link settings on the connected equipment.

Recommendations

Use this passive DAC cable for short, fixed-length connections where cost, low power and low latency are primary concerns. Avoid using passive copper DACs for longer runs; for distances beyond the specified short-reach range, consider active copper or optical solutions. Follow equipment vendor compatibility lists and handle connectors by the housing to prevent damage to mating surfaces.