DAC cable CBO QSFP28-DAC-3M 3m Passive copper QSFP28 to QSFP28

The BlueOptics DAC cable CBO QSFP28-DAC-3M is a 3-meter passive copper direct-attach cable providing a QSFP28-to-QSFP28 connection for short-reach, high-speed links. Designed for use in data centers and network racks, this assembly delivers a compact, single-piece cabling solution that connects QSFP28 ports on switches, servers and storage devices while minimizing latency and setup complexity.

Advantages

This passive copper DAC cable offers low latency and predictable signal performance for short-distance links. The 3 m length reduces clutter and airflow obstruction in racks compared with longer cables, and the single integrated assembly simplifies installation and replacement. Using a direct-attach approach eliminates the need for separate transceivers, lowering overall link cost and easing inventory management.

Suitable for

• Short-reach interconnects between QSFP28 ports in data center switch-to-switch links
• Server-to-switch connections requiring high-bandwidth, low-latency links
• Storage array connections and top-of-rack aggregation within a single rack or adjacent racks

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive twinaxial copper
• Length: 3 m
• Suitable reach: short-reach data center links
• Compatible speed: 100 G (QSFP28 interface)
• Construction: single integrated assembly for direct attach

How to use

Ensure both devices have QSFP28 ports and are powered down or in a state recommended by the equipment vendor for hot-plug operations. Align each QSFP28 connector with the corresponding port and insert until the latch engages. Verify link status through device diagnostics or management interfaces. For removal, release the latch and pull the connector straight out to avoid damaging ports. No additional transceivers or module mounting are required.

Recommendations

Use this 3 m passive QSFP28 DAC for short-distance connections within the same rack or between adjacent racks. Maintain cable bend radius as recommended by the manufacturer, avoid sharp kinks, and keep the cable clear of hot airflow paths. Confirm compatibility with the host devices' QSFP28 ports and check link parameters after installation to ensure expected performance.