DAC cable CBO QSFP-40G-CU05M 5m passive copper for QSFP+ 40Gbps connections

BlueOptics DAC cable CBO QSFP-40G-CU05M is a 5 m passive copper direct attach cable engineered for QSFP+ ports to establish 40 Gbps links. The cable connects QSFP+ ports directly without separate transceivers, offering a compact and economical solution for short-reach interconnects in data centre environments. Intended for rack-to-rack and top-of-rack connections, this passive copper assembly provides stable throughput and low latency for high-density switching and server interconnects.

Advantages

This passive DAC cable reduces both power consumption and cost by eliminating the need for active optical transceivers. Its integrated QSFP+ connectors ensure easy hot-pluggable installation and robust mechanical mating. The 5 metre length is optimised for short-reach links inside racks or between adjacent racks while maintaining the full 40 Gbps bandwidth and reliable electrical signal transmission.

Suitable for

• Rack-to-rack high-speed interconnects in data centres
• Top-of-rack (ToR) switch to server connections
• Server-to-switch links requiring low latency and high throughput
• High-density switch clusters with QSFP+ ports

Key specifications

• Connector type: QSFP+ to QSFP+
• Transmission medium: Passive copper direct attach
• Data rate: 40 Gbps
• Length: 5 metres
• Compatibility: Designed for devices with QSFP+ ports supporting 40 Gbps links
• Latency: Low electrical latency suitable for high-performance networking

How to use

Insert each QSFP+ connector into the corresponding QSFP+ port on network switches, routers or servers until the connector latches. Verify link status through the device management interface and ensure appropriate port configuration for 40 Gbps operation. No external power or transceiver modules are required. For removal, depress the connector latch and pull the cable straight out to avoid damaging the port.

Recommendations

Use this 5 m passive DAC cable for short, high-density interconnects where 40 Gbps performance is required and transceiver-free operation is preferred. Avoid tight bends near the connector and maintain appropriate airflow in racks. Ensure devices support passive DAC compatibility and QSFP+ 40 Gbps signalling before deployment.