DAC cable CBO QSFP28-DAC-5M passive direct attach 5 m for QSFP28 ports

Passive direct attach copper (DAC) cable CBO QSFP28-DAC-5M is a 5 metre twinax assembly engineered for QSFP28 ports to support short-reach 100Gbps electrical links. Designed for data centre environments, this BlueOptics cable delivers a low-latency, high-bandwidth connection between switches, routers and network interface cards without the need for transceivers. The cable is intended for plug-and-play installation and offers a cost-effective solution for top-of-rack and server interconnects where distances up to 5 metres are required.

Advantages

The passive twinax construction provides reliable signal integrity and minimal latency for 100Gbps links while eliminating the power and cost overhead of optical transceivers. The fixed 5 metre length simplifies cable management and reduces inventory complexity. Compatible with QSFP28 ports, the assembly supports high-density deployments and is suitable for short-distance aggregation and switch-to-switch connections. Its robust connectors and twisted pair geometry are optimised for stable electrical performance in rack environments.

Suitable for

• Short-reach 100Gbps links between switches and routers
• Top-of-rack (ToR) server interconnects in data centres
• High-speed aggregation and spine-leaf fabrics
• Direct QSFP28 port connections where optical transceivers are not required

Key specifications

• Interface type: QSFP28 to QSFP28 electrical twinax cable
• Length: 5 metres
• Data rate: 100 Gbps class short-reach electrical link
• Cable type: Passive twinax copper assembly
• Latency: Low-latency design suitable for high-performance switching
• Installation: Plug-and-play, no separate transceivers required
• Usage environment: Designed for rack and data centre deployments

How to use

Install the CBO QSFP28-DAC-5M by inserting each QSFP28 connector into the corresponding QSFP28 port on the network devices until the connector latches. Ensure devices are powered down or follow hot-plug guidelines of your hardware when connecting or disconnecting. No additional configuration or transceivers are required; once connected, devices should detect the link and negotiate the appropriate 100Gbps electrical connection. Route the cable to avoid sharp bends and maintain recommended bend radius for twinax assemblies.

Recommendations

For best performance, use this passive DAC cable for links up to 5 metres within the same rack or between adjacent racks. Confirm QSFP28 port compatibility with your switching and server hardware and follow vendor guidelines for hot-plugging. Avoid excessive bending, tension or exposure to sources of electromagnetic interference to maintain stable signal integrity.