DAC cable CBO QSFP28-DAC-2M 2 m Passive Copper 100G for QSFP28 ports

Direct Attach Copper (DAC) cable CBO QSFP28-DAC-2M is a 2 m passive twinax copper cable engineered for 100G links using QSFP28 ports. Designed for short-reach connections inside racks or between adjacent racks, this 2-meter DAC provides low latency and power-efficient high-bandwidth interconnects for switches, routers and servers. The cable supports native 100 Gigabit Ethernet signalling and is suitable for environments where cost-effective, reliable and straightforward cabling is required.

Advantages

The passive twinax construction delivers low insertion loss and minimal signal degradation over short distances, reducing the need for more complex optical transceivers. As a copper cable, it consumes no optical transceiver power and offers a predictable electrical interface for QSFP28 ports. Its fixed 2 m length simplifies rack planning and reduces excess cabling. Compatibility with standard 100G QSFP28 ports ensures plug-and-play deployment without additional configuration.

Suitable for

• Rack-to-rack 100G connections in data centers
• Intra-rack uplinks between switches and servers
• High-throughput, short-reach interconnects for top-of-rack and spine switches
• Cost-sensitive environments requiring energy-efficient links

Key specifications

• Cable type: Passive twinax copper (Direct Attach Copper)
• Connector: QSFP28 to QSFP28
• Nominal length: 2 meters
• Data rate: 100 Gbit/s (supports 100 Gigabit Ethernet signalling)
• Typical use: Short-reach, intra-rack and rack-to-rack interconnects
• Latency: Low-latency electrical connection suitable for high-throughput traffic
• Power: Passive design (no active electronics in cable)

How to use

Install the QSFP28-DAC-2M by inserting each QSFP28 connector into the corresponding QSFP28 port on your network devices until the latch engages. Ensure ports are powered down or follow hot-plug guidelines specified by your hardware vendor if connecting to live systems. Verify link status through device LEDs or management interfaces and confirm that the interface is negotiated for 100G operation. Avoid sharp bends and excessive strain on the cable; maintain recommended bend radius to preserve electrical performance.

Recommendations

Use this passive 2 m DAC for short-distance, high-bandwidth links where optical transceivers are unnecessary. Keep service loop and bend radius within vendor guidelines, and deploy in environments with appropriate airflow and mounting to avoid mechanical stress. For distances beyond typical intra-rack or adjacent-rack runs, consider optical solutions or active copper options.