Direct Attach Cable BlueOptics QSFP28-DAC-3M 100GBASE-CR4, QSFP28, 3 m

BlueOptics QSFP28-DAC-3M is a 3-meter Direct Attach Copper (DAC) cable with QSFP28 connectors that supports 100GBASE-CR4 for short-reach 100 Gbps links. It provides a passive copper connection intended for direct device-to-device connections such as switch-to-switch, switch-to-router or network interface card (NIC) links in data centre environments. The design removes the need for separate optical transceivers and fiber patching for short-distance uplinks and top-of-rack interconnects.

Advantages

The DAC cable offers low latency and predictable performance with minimal power consumption compared to optical modules. As a fixed copper assembly with QSFP28 interfaces, it simplifies installation and reduces component count in dense rack deployments. Its 3 m length provides flexibility for common rack and cabinet layouts while maintaining signal integrity for 100GBASE-CR4 connections.

Suitable for

• Short-reach 100 Gbps links between switches
• Top-of-rack and spine/leaf interconnects in data centres
• Direct connections to network interface cards (NICs) in servers
• Aggregation and uplink ports where fibre transceivers are not required

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Direct Attach Copper (passive DAC)
• Supported standard: 100GBASE-CR4
• Nominal length: 3 metres
• Data rate: 100 Gbps
• Typical use: short-reach rack-level interconnects

How to use

Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port on the devices to be connected. Ensure ports are powered down or follow hot-plug guidelines of the equipment manufacturer if available. Verify link status through device management interfaces and confirm 100G operation. Route the cable to avoid sharp bends and mechanical stress; secure within the rack to prevent strain on connectors.

Usage recommendations

For reliable operation, use this DAC cable for short-distance, high-bandwidth links within the same rack or adjacent racks. Avoid exceeding the specified bend radius and keep the cable away from sources of electromagnetic interference. Check compatibility with equipment vendor port firmware or compatibility lists when deploying in heterogeneous environments.