DAC cable CBO QSFP28-DAC-3M 3m passive copper QSFP28 to QSFP28

The CBO QSFP28-DAC-3M is a 3-meter passive copper Direct Attach Cable (DAC) designed for QSFP28 ports. This BlueOptics cable provides a fixed, low-latency electrical link between devices with QSFP28 interfaces, enabling 100Gb/s connections without separate optical transceivers. It is intended for short-reach links in data center environments such as top-of-rack, aggregation and server-to-switch interconnects where a reliable, cost-effective copper cable is required.

Advantages

The passive 3 m DAC offers lower power consumption and reduced latency compared with optical modules and active cables. Being a direct attach solution, it eliminates the need for separate transceivers, simplifying installation and lowering total hardware cost. Its QSFP28-to-QSFP28 form factor ensures compatibility with standard 100Gb/s QSFP28 ports and supports stable, high-throughput connections suitable for dense rack deployments in data centers.

Suitable for

• Short-reach 100Gb/s links between switches and servers
• Top-of-rack (ToR) and aggregation layer interconnects
• High-density rack installations requiring fixed copper links
• Environments where low latency and low power are priorities

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive copper Direct Attach Cable (DAC)
• Length: 3 meters
• Data rate support: up to 100 Gbps aggregated (QSFP28)
• Application: short-reach data center interconnects
• Form factor: fixed twinax copper cable with integrated connectors

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the networking devices until the latch engages. Ensure both ports support passive DAC connections and that devices are powered down or follow hot-plug guidelines provided by the device manufacturer if inserting while powered. After installation, verify link status on both devices and monitor for appropriate data rates and error counters. For removal, release the latch and pull the connector straight out to avoid stress on the cable and ports.

Usage recommendations

Use the cable within standard data center environmental conditions and avoid tight bends or kinks; maintain the manufacturer’s minimum bend radius. Prefer passive DACs for short, fixed-length connections where low latency, low power consumption, and cost efficiency are required. Confirm compatibility with your switch or server vendor’s supported cable list to ensure link recognition and optimal performance.