DAC Cable BlueOptics DAC-QSFP-100G-0.5M-BL 0.5m QSFP28 Male/Male

The BlueOptics DAC-QSFP-100G-0.5M-BL is a 0.5 m direct attach cable (DAC) with QSFP28 male connectors on both ends, designed for short-range, high-speed data transmission in data centers and network racks. This passive twinax copper cable supports 100GBase-CR4 signaling and is intended for linking compatible switches, routers and servers across adjacent rack units or within the same rack. The cable uses 30 AWG conductors and complies with MSA guidelines for form factor and interoperability.

Advantages

This 0.5 m QSFP28-to-QSFP28 DAC offers a low-latency, low-power connectivity option for short distances where optical transceivers are not required. As a passive twinax solution it does not rely on active electronics in the cable, resulting in reduced power consumption and a simple, robust design. Manufactured from quality components and tested for compatibility with major hardware platforms, the cable is suitable for reliable, long-term operation in high-density network environments.

Suitable for

• Connecting QSFP28 ports on switches and routers within the same rack or between adjacent racks
• High-bandwidth server-to-switch or switch-to-switch links at 100 Gbps
• Use in data center top-of-rack and leaf-spine architectures for short reach links

Key specifications

• Cable length: 0.5 meter
• Connector type: QSFP28 male to QSFP28 male
• Data rate: up to 100 Gbps (100GBase-CR4 compatible)
• Cable type: passive twinax copper (Direct Attach Cable)
• Conductor gauge: 30 AWG
• Form-factor compliance: MSA-compliant QSFP28

How to use

Before installation, verify that both devices explicitly support passive QSFP28 DACs and the 100GBase-CR4 electrical interface. Insert each QSFP28 connector into a compatible port until the latch engages. Route the cable to avoid sharp bends, excessive stretching or compression, and secure it within the rack to prevent strain on connectors. No separate power or configuration on the cable is required; link negotiation and monitoring are handled by the connected hardware according to supported protocols.

Recommendations

Use this BlueOptics 0.5 m DAC for short, high-bandwidth connections where low latency and low power are priorities. Avoid use over distances beyond the specified 0.5 m and confirm hardware compatibility with passive DACs to ensure proper operation.