BlueOptics AT-QSFP3CU-BL InfiniBand fibre optic cable 3 m QSFP Black

The BlueOptics AT-QSFP3CU-BL InfiniBand fibre optic cable is a 3 m QSFP-to-QSFP direct attach solution designed for short-distance, high-speed links in racks and adjacent rack pairs. This passive 40GBase-CR4 twinax copper-style cable delivers up to 40 Gbit/s per link and features male QSFP connectors in a black housing. It is suitable for use with switches, routers, storage systems and other hardware platforms that support QSFP 40G direct attach connections.

Advantages

This cable provides a cost-effective, low-latency direct attach connection for short-range interconnects without active electronics, consuming minimal power. Built to MSA-compliant specifications and assembled using high-quality components, the cable offers reliable data transmission for Ethernet, FCoE, Fibre Channel and InfiniBand protocols up to 40 Gbit/s on a 3 m span. The design aims for long service life and broad compatibility with major networking hardware that supports QSFP passive DAC links.

Suitable for

• Short-distance 40 Gbit/s links between switches and routers in racks
• Storage system interconnects and SAN fabric connections
• Server-to-switch or switch-to-switch connections in data centers
• InfiniBand, Ethernet, FCoE or Fibre Channel high-speed links within 3 m

Key specifications

• Connector type: QSFP to QSFP, male/male
• Length: 3 meters
• Data rate support: up to 40 Gbit/s
• Cable type: passive direct attach (twinax-style) for short-range electrical signaling
• Wire gauge: 30 AWG (as used in comparable DAC assemblies)
• Power consumption: passive design with minimal additional power draw
• Standards: MSA-compliant QSFP 40GBase-CR4 form factor and electrical characteristics

How to use

Ensure both endpoints support passive QSFP 40G direct attach cables before installation. Power down or follow hot-plug guidelines for the specific hardware if required by the vendor. Align and insert each QSFP connector fully into the corresponding port until it latches; verify link status on your devices and confirm speed and protocol settings (Ethernet, FCoE, Fibre Channel or InfiniBand) in the network equipment management interface. For removal, release the connector latch and withdraw straight out to avoid damaging the port.

Usage recommendations

Use this passive QSFP direct attach cable for short, fixed connections inside racks or between adjacent racks where 3 m length and 40G performance are suitable. Avoid routing the cable near high-heat sources, sharp bends, or areas with heavy mechanical stress. Verify vendor compatibility lists when deploying in certified hardware platforms and consider a test sample in your environment to confirm full interoperability.