Direct Attach Copper (DAC) Cable CBO CBL-QSFP-40GE-PASS-5M-F1 5 m, QSFP+ to QSFP+, passive, black

CBO CBL-QSFP-40GE-PASS-5M-F1 is a 5 metre passive Direct Attach Copper (DAC) cable with QSFP+ connectors on both ends, engineered for short-range 40 Gigabit Ethernet links. The cable provides a fixed copper connection for server-to-switch or switch-to-switch setups in data centre racks and high-density network environments. As a passive solution, it does not require optical transceivers and delivers low-latency, power-efficient performance for short-reach interconnects.

Advantages

The passive QSFP+ to QSFP+ DAC design reduces power consumption and eliminates the need for separate transceivers, lowering operational cost and simplifying installation. With a durable insulated copper assembly and QSFP+ interface compatibility, the cable supports consistent 40GbE throughput while maintaining signal integrity over its five-metre length. Its fixed-connector build offers a reliable, low-maintenance alternative to active modules or fibre patching in dense rack environments.

Suitable for

Key specifications

How to use

Connect each QSFP+ connector to the corresponding QSFP+ port on the devices to be linked, ensuring proper seating until the connector latch engages. Verify that both endpoints are configured for a 40GbE interface and that network interfaces are enabled in the host and switch management. Passive DAC cables are plug-and-play in most systems; however, consult device documentation for any required port settings or compatibility notes. Avoid bending the cable sharply near the connectors and route it within rack management channels to prevent mechanical stress.

Recommendations

Use this passive DAC cable for short-distance fixed links inside racks or between adjacent racks. Maintain gentle cable bends (minimum bend radius per manufacturer guidance) and avoid exposure to high mechanical strain or electromagnetic interference sources. For runs beyond the supported short-reach distance or where optical isolation is required, consider optical transceivers and fibre cabling instead.