Network Cable BlueOptics JG328A-BL QSFP InfiniBand 5m Black

The BlueOptics JG328A-BL QSFP InfiniBand 5m Black is a 5-metre direct attach cable with QSFP connectors on both ends designed for short-range, high-speed links in racks and adjacent rack rows. Constructed as a passive twinax cable compliant with QSFP MSA guidelines, it supports 40G data rates and is intended for use in environments where 40GBase-CR4, InfiniBand, Ethernet and similar protocols are required. The cable is finished in black and weighs approximately 0.44 kg, offering a compact, low-latency connection for switches, routers and storage systems that accept QSFP-to-QSFP direct attach cables.

Advantages

The cable provides a straightforward, low-power physical connection for high-throughput links without active electronics, resulting in low latency and reduced power consumption. Compliance with common QSFP MSA specifications ensures mechanical and electrical interoperability with compatible hardware. Its twinax construction delivers reliable short-distance signal transfer and a durable black jacket that suits professional rack installations.

Suitable for (tasks / use cases)

• Connecting QSFP ports between switches within the same rack or adjacent racks
• High-performance computing clusters using InfiniBand connectivity
• 40GBase-CR4 links for Ethernet and FCoE over short distances
• Interconnects between storage systems and servers supporting QSFP DAC

Key specifications

• Cable length: 5 m
• Connector type: QSFP to QSFP (male-to-male)
• Data rate support: up to 40 Gbps (protocol dependent)
• Cable type: passive twinax direct attach cable
• Wire gauge: 30 AWG (typical for this class of DAC)
• Colour: Black
• Weight: approx. 0.44 kg

How to use

Install the cable by inserting each QSFP connector into the respective QSFP port on your network devices until the connector latches. Ensure devices are powered down or that hot-plugging is supported by your hardware before inserting or removing the cable. Verify that both endpoints support passive QSFP direct attach twinax cables and that firmware or hardware compatibility requirements of the devices are met. After physical installation, confirm link status and negotiate speed and protocol settings through the device management interface.

Recommendations

Use this cable for short-range 40G links in controlled rack environments. Avoid tight bends and excessive pulling; maintain bend radius recommendations for twinax cables and route the cable within cable management trays to reduce strain. For critical deployments, verify compatibility with your switch or server vendor and, if available, test with a sample unit before wide deployment.