DAC cable CBO QSFP28-DAC-2M 2 m length compatible with Cumulus — QSFP28 direct attach cable

Direct Attach Copper (DAC) cable CBO QSFP28-DAC-2M is a 2 m QSFP28 compatible cable designed for short-range, high-speed connections between network devices. Compatible with Cumulus, this QSFP28 direct attach cable provides a low-latency, energy-efficient connection for rack-level links, switch-to-switch aggregation and server-to-switch uplinks. The cable supports native QSFP28 interfaces and is intended for use in data centre topologies where reliable 100 Gigabit connectivity is required over a short distance.

Advantages

This QSFP28 direct attach cable offers reliable high-bandwidth performance with minimal signal latency and reduced power consumption compared to optical transceivers. The fixed copper assembly and 2 m length simplify cabling within racks and adjacent racks, reducing the need for additional transceivers and fibre patching. Compatibility with devices that support QSFP28 and Cumulus ensures straightforward interoperability in many modern network environments.

Suitable for

• 100 Gigabit switch-to-switch connections within the same rack or adjacent racks
• Server-to-switch uplinks requiring low latency and high throughput
• Top-of-rack and aggregation layer links in data centres
• Short-range interconnects where cost-effective copper connectivity is preferred

Key specifications

• Connector type: QSFP28 direct attach (fixed copper)
• Cable length: 2 m
• Data rate: supports 100 Gigabit Ethernet over a single QSFP28 link
• Cable medium: copper twinax assembly for short-range links
• Typical use: rack-level and adjacent-rack interconnects with low latency
• Compatibility: designed for equipment supporting QSFP28 interfaces and Cumulus environments

How to use

Insert each end of the QSFP28-DAC-2M cable into the QSFP28 ports of the two devices to be connected, ensuring the latch engages securely. Confirm that both network devices are configured for the same link speed and duplex settings if manual configuration is required. Monitor link status and perform any necessary interface enablement on the switches or servers. For best results, route the cable to avoid sharp bends and do not exceed the recommended bend radius for twinax assemblies.

Recommendations

Use this 2 m QSFP28 direct attach cable for short-range, high-performance connections inside racks or between adjacent racks. Avoid installation in areas where cable movement or frequent reconfiguration could stress the fixed copper assembly; if longer or more flexible runs are needed, consider active optical or fibre solutions. Follow equipment vendor guidance for QSFP28 port handling and ESD precautions.