DAC cable CBO QSFP28-DAC-3M 3 m QSFP28 direct-attach copper cable for 100GbE

The BlueOptics DAC cable CBO QSFP28-DAC-3M is a 3 m direct-attach copper cable with QSFP28 connectors, engineered for short-reach 100GbE links in data center and rack environments. Compatible with Cumulus systems, this cable provides a direct electrical connection between QSFP28 ports on switches, routers and servers without the need for optical transceivers. Its fixed copper assembly reduces latency and power consumption while simplifying physical installation and port management.

Advantages

The direct-attach copper design offers a cost-effective solution for short-distance 100GbE connections by eliminating separate transceivers and optical modules. With QSFP28-to-QSFP28 connectivity, the cable supports high throughput and low latency suitable for aggregation and spine-leaf topologies. The 3 m length balances reach and cable management inside racks, and the pre-terminated connectors ensure consistent electrical performance and quick deployment.

Suitable for

• Short-reach 100GbE links between top-of-rack switches
• Connections between routers and aggregation switches in data centers
• Server-to-switch high-speed uplinks within the same rack or adjacent racks
• Low-latency network segments in campus or enterprise core networks

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Direct-attach copper (DAC)
• Rated speed: 100 Gigabit Ethernet (100GbE)
• Length: 3 meters
• Application: Short-reach, in-rack and adjacent-rack links
• Power: Passive copper assembly with reduced power consumption compared to optical transceivers
• Latency: Low electrical latency suitable for high-performance switching

How to use

Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port on the devices until the latch engages. Ensure devices are powered down or follow hot-plug guidance from the equipment manufacturer if live insertion is supported. Verify link status through device indicators or management interfaces. Route the 3 m cable to avoid sharp bends and maintain proper airflow in racks; secure with cable ties or management panels as needed to prevent strain on connectors.

Recommendations

Use this direct-attach copper cable for short, high-bandwidth connections where 3 m reach is sufficient. Avoid deploying DAC cables for longer runs beyond recommended distances; for extended links, consider optical transceivers and fiber cabling. Maintain connector cleanliness and inspect latches before insertion to ensure reliable electrical contact and minimize risk of port damage.