QSFP28 DAC Cable BlueOptics QSFP28-DAC-0.5M-PS-BL 0.5m Male/Male

The BlueOptics QSFP28 DAC Cable QSFP28-DAC-0.5M-PS-BL is a 0.5 metre passive direct attach twinax copper cable with QSFP28 male connectors on both ends. Designed for short-reach, high-speed links, it supports 100GBase-CR4 electrical transport and is intended for rack-to-rack or within-rack connections in data centres and network environments. The cable conforms to QSFP28 MSA electrical and mechanical interface definitions and is intended for use with hardware platforms that support QSFP28 passive DACs.

Advantages

The cable offers a low-latency, low-power passive connection for 100 Gbps links, eliminating the need for transceivers for short-distance connections. Its twinax copper construction and QSFP28 connectors provide a reliable, mechanically compatible interface for switches, routers and storage systems. Built to MSA-aligned specifications, the cable is compatible with typical 100GBase-CR4 use cases and is suitable for environments that prioritise cost-effectiveness and simple installation.

Suitable for

• Short-reach 100 Gbps connections within and between adjacent racks
• High-density switch-to-switch or switch-to-storage links in data centres
• Environments where low latency and low power consumption are required

Key specifications

• Length: 0.5 metre
• Connector type: QSFP28 male to QSFP28 male
• Media: passive twinax copper (30 AWG)
• Data rate support: up to 100 Gbps (100GBase-CR4 electrical transport)
• Compliance: QSFP28 MSA electrical/mechanical interface alignment

How to use

Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port until the latch engages. Ensure both devices support passive QSFP28 DACs and the 100GBase-CR4 electrical protocol. Route the cable to avoid sharp bends and mechanical strain; maintain recommended bend radius for twinax copper cabling. No additional power or transceiver modules are required for passive operation. Verify link status and speed on connected equipment after insertion.

Recommendations

Use this 0.5 m passive QSFP28 DAC for short-distance interconnections inside racks or between adjacent racks. Confirm hardware compatibility with passive DACs and 100GBase-CR4 before deployment, and handle connectors carefully to avoid contamination and bent pins.