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

The BlueOptics DAC cable CBO QSFP28-DAC-5M is a 5 m passive copper direct attach cable engineered for QSFP28 ports. It offers a fixed connection for short-reach, high-speed links such as switch-to-switch or switch-to-server interconnects. Designed for environments that require low latency and energy-efficient cabling, this 5 metre QSFP28 copper assembly supports dense data center topologies where a cost-effective and reliable physical link is needed.

Advantages

This passive DAC cable delivers low latency and minimal signal conversion overhead, reducing power consumption compared with active optical modules. The integrated QSFP28 connectors simplify installation by providing a pre-assembled, robust copper link without additional transceivers. The 5 m length balances reach and rack flexibility for typical data center layouts, and the cable’s passive design reduces heat and operational complexity.

Suitable for

• Switch-to-switch uplinks in top-of-rack or spine-leaf architectures
• Switch-to-server high-speed connections within racks or adjacent racks
• Short-reach 100G Ethernet links where low latency and energy efficiency are priorities
• Data center deployments seeking cost-effective physical interconnects for QSFP28 ports

Key specifications

• Connector type: QSFP28 to QSFP28 passive copper assembly
• Cable length: 5 metres
• Transfer rate: supports 100G-class QSFP28 links (short-reach application)
• Design: direct attach copper (passive), fixed-terminated
• Typical use: short-reach interconnects inside racks and between adjacent racks
• Thermal and power: passive operation with lower power draw compared to active optical solutions

How to use

Install the DAC cable by inserting each QSFP28 connector into compatible QSFP28 ports on network switches or servers until the connector latch engages. Ensure both devices support passive copper DAC modules and that the port settings match the intended 100G link speed and lane configuration. Route the cable to avoid sharp bends and interference with other equipment, maintain proper airflow in the rack, and secure the cable with available cable management to prevent strain on the connectors. If the link does not rise, verify port compatibility, firmware versions and module support in the connected devices.

Recommendations

Use this 5 m passive QSFP28 DAC for short-distance connections within the same rack or neighboring racks. Prefer passive copper assemblies for deployments where power efficiency and low latency are required and where the reach does not exceed the specified length. Confirm device compatibility and firmware support for passive DACs before installation to ensure link stability.