Direct Attach Copper (DAC) cable CBO DAC-QSFP-40G-3M 40Gbps QSFP+ to QSFP+ 3 m, blue

The Direct Attach Copper (DAC) cable CBO DAC-QSFP-40G-3M is a passive 40Gbps twin-ax copper assembly with QSFP+ connectors on both ends and a 3 meter length. It provides a direct electrical connection between QSFP+ ports for short-reach interconnects inside racks and between adjacent switches or servers. The cable is factory-terminated, color-coded blue for easy identification and designed for plug-and-play use without the need for optical transceivers.

Advantages

This DAC cable offers a low-latency, high-bandwidth link at 40Gbps suitable for dense data center environments. As a passive copper solution it consumes no additional power for active signal conversion, reduces overall deployment cost compared to optical modules for short distances, and simplifies installation due to its fixed-length, pre-terminated design. The QSFP+ connectors provide reliable mating with standard QSFP+ ports and the robust cable jacket supports frequent handling within rack environments.

Suitable for

• Short-reach server-to-switch or switch-to-switch links inside racks
• High-throughput connections for storage arrays and blade servers
• Top-of-rack and leaf-spine architectures requiring 40Gbps uplinks
• Environments where low latency and cost-effective interconnects are required

Key specifications

• Data rate: 40 Gbps (aggregate)
• Connector type: QSFP+ to QSFP+
• Cable type: Passive twin-ax copper assembly
• Length: 3 meters
• Color: Blue
• Typical use: Short-reach, in-rack interconnects

How to use

Ensure compatible QSFP+ ports on both devices and power down equipment if recommended by your hardware vendor. Align the QSFP+ connectors with the ports and insert until the connector latch engages. Verify link status via the host devices or switch management interface. For cable removal, release the connector latch and pull straight to avoid damaging the port. No additional configuration is required for basic electrical connectivity; driver and firmware compatibility should be confirmed for full feature support.

Recommendations

Install the DAC cable within the recommended bend radius to avoid stress on the twin-ax cores. Use for connections up to 3 meters where passive copper is supported by the equipment. Avoid routing near high-power cables or sources of electromagnetic interference to maintain signal integrity.