DAC cable CBO Q28-4S28-DAC-3M 3 m QSFP28 direct attach copper cable

CBO Q28-4S28-DAC-3M is a 3-meter QSFP28 direct attach copper (DAC) cable engineered for 100GbE connections between compatible QSFP28 ports. The cable provides a fixed electrical link for high-speed data transfer between switches, routers and servers, eliminating the need for optical transceivers. Its short-reach design is intended for data centre and rack-to-rack interconnects where low latency and reliable throughput are required.

Advantages

The DAC cable delivers a cost-effective and energy-efficient alternative to optical modules for short distances, with minimal latency and stable signal integrity. Its plug-and-play form factor simplifies installation and reduces the number of components in the network path. Constructed for compatibility with QSFP28 interfaces, the cable supports high-density rack deployments and helps maintain predictable performance in demanding 100GbE environments.

Suitable for

• Short-reach 100GbE connections between switches in the same rack
• Rack-to-rack interconnects within data centre rows
• Direct links between servers and top-of-rack switches
• High-density aggregation and spine-leaf architectures

Key specifications

• Interface type: QSFP28 to QSFP28 direct attach copper
• Cable length: 3 m
• Data rate: supports 100 Gigabit Ethernet
• Transmission medium: copper twinax for short-reach connections
• Latency: low fixed electrical latency suitable for time-sensitive traffic
• Connector: integrated QSFP28 plug ends for direct port insertion

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the network devices until the latch engages. Ensure the cable is routed without sharp bends and secured to avoid strain on the connectors. No additional transceivers or configuration are required in most environments; the connected devices should detect the link automatically and negotiate the appropriate 100GbE parameters. Verify link status via device management interfaces after installation.

Recommendations

Use this DAC cable for short-distance interconnects where optical conversion is unnecessary. Maintain bend radius recommendations, keep cable length appropriate to the deployment, and avoid running the cable alongside high-voltage power lines to reduce interference. For mixed-vendor environments, check device compatibility lists to ensure proper operation.