Direct Attach Copper Cable BlueOptics UACC-DAC-QSFP28-50CM 100GBASE-CR4 QSFP28 0.5 m 30AWG Infiniband EDR compatible

The BlueOptics Direct Attach Copper Cable UACC-DAC-QSFP28-50CM is a 0.5 m passive copper interconnect that delivers 100G connectivity over QSFP28 interfaces using 100GBASE-CR4 electrical signalling. Built with 30 AWG conductors and end-to-end QSFP28 plugs, this short-reach cable is designed for top-of-rack and adjacent-rack links between switches, network interface cards, and servers. It is compatible with Infiniband EDR environments and fits ports commonly used in data center equipment, including many Ubiquiti-compatible QSFP28 ports.

Advantages

This copper direct attach cable provides a compact, low-latency and cost-effective option for short-distance 100G interconnects without the need for optical transceivers. The 0.5 m length reduces clutter and signal loss in dense rack environments, while the 30 AWG construction keeps the cable flexible for routing in tight spaces. QSFP28-to-QSFP28 connectivity ensures straightforward plug-and-play installation between compatible devices and supports 100GBASE-CR4 electrical signalling used in many high-speed networks.

Suitable for

• Short-reach links between switches and top-of-rack servers in data centers
• Direct connections between network interface cards (NICs) and switches
• Infiniband EDR-compatible environments requiring copper QSFP28 interconnects
• Environments using Ubiquiti-compatible QSFP28 ports for 100G links

When it may not be suitable

This passive copper cable is intended for short-reach connections; it is not suitable for long-distance links where optical transceivers or fiber cabling are required. It also depends on endpoint compatibility — devices must support QSFP28 passive copper connections and 100GBASE-CR4 signalling. For environments that require lower electromagnetic interference susceptibility or longer reach, fiber solutions are a better choice.

Key specifications

• Connector type: QSFP28 to QSFP28
• Rated speed: 100 Gbit/s using 100GBASE-CR4 electrical signalling
• Cable length: 0.5 m
• Conductor gauge: 30 AWG
• Form factor: Passive direct attach copper
• Compatibility: Infiniband EDR-compatible and commonly used QSFP28 ports (including Ubiquiti-compatible ports)

How to use

Ensure both devices support QSFP28 passive copper connections and 100GBASE-CR4 signalling. With devices powered and available, insert each QSFP28 connector into the corresponding port until the latch engages. Avoid sharp bends and excessive pulling; route the 0.5 m cable to minimize stress on connectors. After connection, verify link status on both endpoints and check that the interfaces negotiate 100G operation. For removal, press the connector latch and pull straight out to avoid damaging the port.

What to consider before purchase

• Confirm both endpoints support QSFP28 passive copper and 100GBASE-CR4 signalling
• Verify the 0.5 m length and 30 AWG construction meet your routing and mechanical requirements
• Check compatibility with your switch or server vendor and any vendor-specific port restrictions

Usage recommendations

Use this BlueOptics QSFP28 direct attach copper cable for short, high-speed rack-level connections where low latency and straightforward installation are priorities. Keep the cable run short and free of tight bends, and confirm link settings after installation to ensure stable 100G operation.