InfiniBand/fibre optic cable BlueOptics DEM-CB100Q28-3-BL 3 m QSFP28 Male/Male

The BlueOptics DEM-CB100Q28-3-BL is a 3 m InfiniBand/fibre optic direct attach solution with QSFP28 male connectors on both ends. Designed for short-reach 100G interconnects, this cable implements a 100GBase-CR4 compatible twinax copper/DA C form factor suitable for high-density rack and adjacent-rack connections. It supports common high-speed protocols and is intended for use in data centers and high-performance computing environments where low latency and reliable 100 Gbps links are required.

Advantages

This 3 m QSFP28 male-to-male cable provides a low-power, low-latency physical link optimized for short-distance, high-bandwidth connections. The passive direct-attach design eliminates the need for active transceivers, reducing cost and power consumption while simplifying installation. Manufactured to MSA-compliant mechanical and electrical standards and assembled with high-quality components, it offers stable performance across supported hardware platforms and is tested for compatibility with major network devices that accept 100GBase-CR4 twinax connections.

Suitable for

• Short-reach 100 Gbps links between switches and routers inside racks
• Interconnects between adjacent server or switch racks
• High-performance computing clusters and InfiniBand fabrics
• Storage systems and SAN top-of-rack connections supporting 100G

Key specifications

• Length: 3 meters
• Connector type: QSFP28 male to QSFP28 male
• Nominal data rate: up to 100 Gbps (100GBase-CR4 compatible)
• Cable type: passive direct attach (twinax copper)
• Wire gauge: 26 AWG
• Compliant with QSFP28 and MSA mechanical/electrical profiles

How to use

Install the cable by inserting each QSFP28 male connector into corresponding QSFP28 ports on networking equipment until the connectors engage securely. Ensure both devices support passive 100GBase-CR4 twinax connections; consult device documentation if necessary. Route the cable to avoid sharp bends and mechanical strain; maintain recommended bend radius for twinax cable to preserve signal integrity. No additional power or configuration is required for the passive cable itself, but verify link negotiation and speed settings on connected devices as part of standard network commissioning.

Recommendations

For reliable operation, use this cable only for short-distance links as specified; avoid extending beyond rack-to-rack spans where 3 m is insufficient. Keep the cable away from high EMI sources and secure it with suitable cable management to prevent damage. Before deployment in production, confirm compatibility with your switch or server platform and, if available, test a sample link to verify performance under your workload.