InfiniBand/fibre optic cable BlueOptics CBL-NTWK-0942-MQ28C05M-BL 0.5 m QSFP28 Male/Male

The BlueOptics CBL-NTWK-0942-MQ28C05M-BL is a 0.5 m InfiniBand / fibre optic cable with QSFP28 male-to-male connectors designed for short-reach, high-speed links in data center racks. It supports 100G data rates over a 0.5 meter direct attach connection and is suitable for electrical twinax (DAC) interconnects where QSFP28 ports are available on switches, servers and storage systems. The compact length and QSFP28 interface make the cable appropriate for connecting adjacent devices in top-of-rack and within-rack installations.

Advantages

This cable delivers 100GBase-CR4 performance in a passive direct-attach format, offering low latency, low power consumption and a simple mechanical connection with QSFP28 male ends. It complies with common MSA electrical specifications for QSFP28 twinax assemblies and is constructed from high-quality components intended for reliable signal transmission over short distances. The short 0.5 m length reduces clutter and signal attenuation in rack environments while providing compatibility with major hardware platforms that support QSFP28 direct attach cables.

Suitable for

• Connecting QSFP28 ports between adjacent switches or between switch and server within a rack
• High-speed InfiniBand or Ethernet 100G links in data center top-of-rack deployments
• Direct attach connections for storage systems, routers, and network appliances that accept passive QSFP28 twinax

Key specifications

• Connector type: QSFP28 male to QSFP28 male
• Length: 0.5 meter
• Data rate: up to 100 Gbit/s (100GBase-CR4 / compatible InfiniBand / FCoE / Fibre Channel where supported)
• Cable type: passive twinax (direct attach copper for short-reach electrical signaling)
• Wire gauge: 30 AWG
• Form factor: direct attach cable (DAC) for within-rack/adjacent-rack links

How to use

Ensure both devices have QSFP28 ports that support passive direct attach twinax connections and that the host hardware and firmware accept third-party DACs. Before installation, power down or follow hot-plug procedures recommended by your equipment vendor. Insert each QSFP28 connector firmly into the corresponding port until it latches. Verify link status in device management interfaces and monitor for correct link speed and lane negotiation. For removal, release the latch mechanism and gently withdraw the connector.

Recommendations

Use the cable for short, high-speed links only; avoid routing it near sources of mechanical stress, excessive heat, or sharp bends. Verify compatibility with your switch or server vendor documentation for passive DAC support and test the link after installation to confirm expected 100G operation.