CBO DAC Cable QSFP28-DAC-2M 2m Passive Copper Direct Attach

The CBO DAC Cable QSFP28-DAC-2M 2m Passive Copper Direct Attach is a 2‑meter direct-attach copper cable with QSFP28 connectors designed for short‑range 100G links between compatible ports. Intended for use inside racks or between adjacent equipment, this passive DAC provides a low-latency, low-power alternative to optical transceivers for server, switch and storage interconnects. The cable offers plug‑and‑play connectivity and requires no separate transceiver modules or fiber patching, simplifying installation and maintenance.

Advantages

The passive copper construction reduces power consumption and heat compared with active modules and optical solutions. With QSFP28 connectors and a 2 m length, the cable enables reliable 100G links while minimizing signal conversion overhead and latency. Its direct-attach design eliminates the need for additional transceivers and fiber cabling, lowering material and operational complexity in rack environments.

Suitable for

• Short-reach 100G connections within the same rack or between adjacent racks
• Interconnecting servers, top-of-rack switches and storage arrays
• High-density data center setups where power and latency must be minimized
• Environments that require plug-and-play 100G links without optical transceivers

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive twinax copper
• Length: 2 meters
• Data rate: Supports 100 Gigabit Ethernet over QSFP28 interfaces
• Form factor: Direct attach cable, no separate transceivers required
• Typical applications: Rack-level server, switch and storage interconnects

How to use

Install the DAC by inserting each QSFP28 connector into the corresponding QSFP28 port on the devices to be connected, ensuring the latch engages securely. No additional configuration or transceiver modules are required; the cable should be recognized by compatible equipment and present a 100G link if ports support that speed. Avoid sharp bends and mechanical strain on the cable during installation and route it to minimize interference and airflow obstruction in the rack.

Recommendations

For optimal performance, use the 2 m passive DAC for short, direct connections within racks or between adjacent racks and verify port compatibility with QSFP28 passive DACs. Maintain bend radii recommended by the manufacturer, keep the cable away from high-power cabling to reduce potential interference, and ensure firm but not excessive insertion force when mating connectors.