Direct Attach Cable CBO DAC-QSFP-40G-0.5M-BL 0.5 m QSFP male to QSFP male 40 Gbit/s

Direct Attach Cable CBO DAC-QSFP-40G-0.5M-BL is a 0.5 metre passive copper QSFP-to-QSFP assembly that supports aggregate data rates up to 40 Gbit/s. It is intended for short-reach, high-bandwidth interconnects in data centre and enterprise network environments, providing a compact, low-latency connection between devices with QSFP ports. The cable's short length and passive design minimise power consumption and signal processing overhead while delivering reliable electrical performance for top-of-rack switches, server cages and blade chassis.

Advantages

This passive direct attach cable offers a simple plug-and-play connection without the need for optical transceivers, reducing component count and operational costs. Its QSFP male connectors on both ends ensure compatibility with standard QSFP ports and a secure physical fit. The 0.5 m length is suitable for close-proximity links, helping to reduce cable clutter and improve airflow in rack installations. The copper assembly provides consistent latency and energy-efficient operation compared with active or optical alternatives for very short links.

Suitable for

• Short-reach links between top-of-rack switches
• Interconnects between blade servers and fabric switches
• High-bandwidth uplinks in switch stacks
• Direct server-to-switch connections in dense rack deployments

Key specifications

• Connector type: QSFP male to QSFP male
• Length: 0.5 metre
• Maximum data rate: 40 Gbit/s aggregate
• Cable type: Passive copper direct attach
• Typical use: Short-reach, in-rack connections

How to use

Ensure both network devices are powered down or follow hot-plugging guidelines from the equipment manufacturer. Align each QSFP connector with the corresponding port and insert firmly until the connector latch engages. Verify link status through device LEDs or management interfaces after powering devices if they were shut down. For removal, release the connector latch and pull straight out to avoid damaging port contacts. Use quality port handling practices to prevent contamination or mechanical stress on ports and connectors.

Recommendations

Use this cable for in-rack connections where short distance and low latency are priorities. Avoid routing the cable near sources of strong electromagnetic interference and keep bend radii within the manufacturer’s guidelines to maintain signal integrity and connector life.