InfiniBand/fibre optic cable BlueOptics QFX-QSFP28-DAC-5M-BL 5m QSFP28 Male/Male

The BlueOptics QFX-QSFP28-DAC-5M-BL is a 5 m QSFP28 Male-to-Male direct attach cable (DAC) designed for short-distance high-speed interconnects in data center environments. As a passive 100GBase-CR4 twinax copper cable with 26 AWG conductors and QSFP28 connectors, it supports up to 100 Gbit/s links for Ethernet, FCoE, Fibre Channel and InfiniBand applications where compatible hardware and protocols are used. The cable is intended for rack-to-rack or in-rack connections and follows MSA-compliant mechanical and electrical specifications for QSFP28 direct attach assemblies.

Advantages

This QSFP28 DAC provides low-latency electrical transmission with minimal power consumption compared to active optical modules, offering a simple and robust physical layer for 100G links. Its 5 m length is suitable for linking adjacent racks or devices within the same rack while maintaining signal integrity through MSA-compliant design and quality components. The passive twinax construction leads to a low failure rate and reduced maintenance compared with more complex active transceivers.

Suitable for

Key specifications

How to use

Install the BlueOptics QSFP28 DAC by inserting each QSFP28 male connector into the appropriate QSFP28 port on the devices to be linked, ensuring the connector latch engages. Confirm that both endpoints support passive DAC operation and the relevant 100G protocol (for example 100GBase-CR4 or supported InfiniBand modes). No external power or optical transceivers are required for passive operation; after physical connection, verify link status and negotiate speed/settings via the host device management interface.

Recommendations

Use this passive QSFP28 DAC for short-distance connections only; for longer runs or where optical isolation is needed, select an appropriate optical transceiver and fiber cable. Avoid tight bends and mechanical stress on the cable and avoid routing near high-power lines to maintain signal integrity and cable lifetime.