Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-1M 1 m Passive QSFP28 to QSFP28

BlueOptics Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-1M is a 1 meter passive copper connection with QSFP28 connectors on both ends, engineered for short-reach 100GbE links. The cable provides a direct electrical interface between QSFP28 ports on switches, routers and servers without the need for separate optical transceivers, enabling compact, low-latency interconnects ideal for dense data centre top-of-rack and server-to-switch deployments.

Advantages

This passive QSFP28 to QSFP28 DAC offers predictable signal integrity and low latency for 100 Gigabit Ethernet applications while reducing power consumption compared with active or optical solutions. The integrated copper assembly simplifies installation and maintenance by eliminating separate modules and fibre patching. Its 1 m length minimizes signal attenuation for short-reach links and supports stable bandwidth for demanding network traffic.

Suitable for

• Short-reach 100GbE links between switches in top-of-rack configurations
• Server-to-switch interconnects inside racks and adjacent rack rows
• High-density data centre cabling where power efficiency and low latency are required
• Temporary or permanent interconnects in lab and test environments

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 1 metre
• Medium: Passive direct attach copper
• Data rate support: 100 Gigabit Ethernet
• Form factor: Fixed twinax cable assembly suitable for QSFP28 ports
• Typical application: Short-reach intra-rack and adjacent-rack connectivity

How to use

Insert each QSFP28 plug into a compatible QSFP28 port on the network devices until the connector latch engages. Confirm link status on both devices and verify negotiated speed is 100GbE. For best performance, use the cable for connections that do not exceed the 1 m length and ensure ports are clean and free of debris before installation. Remove the cable by depressing the connector latch and pulling straight out to avoid damaging the port.

Recommendations

Use this passive DAC for short-distance, high-throughput links inside racks or between adjacent racks. Avoid sharp bends and excessive tension on the cable; maintain bend radius recommended by the manufacturer and keep the cable away from heat sources and strong electromagnetic interference. Verify compatibility with device firmware and port specifications prior to deployment.