BlueOptics SFP-DAC40-3M-BL InfiniBand fibre optic cable QSFP 3m Male/Male

The BlueOptics SFP-DAC40-3M-BL InfiniBand fibre optic cable QSFP 3m Male/Male is a 3-metre direct attach cable designed for short-reach, high-speed interconnects in racks and adjacent rack rows. It implements QSFP-to-QSFP connectivity and supports 40G data rates for Ethernet, Fibre Channel, FCoE and InfiniBand applications where QSFP passive twinax or equivalent solutions are supported. The cable is intended for use with hardware platforms that accept 40GBase-CR4 / QSFP direct attach connections and provides a compact, low-latency link for switches, routers, storage systems and servers.

Advantages

This 3 m QSFP male-to-male cable offers a low-power passive solution for short-distance high-throughput links. Its passive twinax construction yields low latency and reduced failure points compared with active components, and the cable conforms to common MSA electrical and mechanical guidelines to ensure interoperability with major network platforms. The design is optimized for consistent signal transfer over short distances and for environments where predictable performance and long service life are required.

Suitable for

• Connecting switches and routers within a rack or between adjacent racks
• Interconnecting storage systems and servers for high-throughput transfers
• Short-reach InfiniBand and 40GBase-CR4 links in data centres
• Environments requiring low-latency, low-power passive cabling

Key specifications

• Length: 3 metres
• Connector type: QSFP to QSFP, male/male
• Supported data rate: up to 40 Gbit/s
• Cable type: passive twinax twin cable suitable for short-reach electrical signalling
• Wire gauge: 30 AWG (typical for this class of DAC)
• Compatibility: designed for hardware that supports 40GBase-CR4 / QSFP passive DAC links
• Typical power consumption: passive (no active electronics in the cable)

How to use

Install the BlueOptics SFP-DAC40-3M-BL by inserting each QSFP connector into the corresponding QSFP port on the devices to be linked, ensuring proper seating and secure latching. Use the cable for direct, short-distance connections only; verify that the target devices explicitly support passive 40G QSFP direct attach cables. No additional configuration is required at the cable level, though connected devices may need port configuration (speed, lane mapping, protocol settings) according to the network design and device firmware.

Usage recommendations

For reliable operation, route and secure the cable to avoid excessive bending and mechanical strain, and keep length within the specified 3 m distance for passive DAC use. Confirm interoperability with device vendor documentation and, if available, test a sample in the intended hardware and firmware environment prior to deployment in critical links.