DAC cable CBO QSFP28-DAC-3M 3 m passive QSFP28 to QSFP28

Passive DAC cable CBO QSFP28-DAC-3M is a 3 meter direct-attach copper cable with QSFP28 connectors at both ends, engineered for short-range 100G interconnects. Designed to connect switches, routers and servers within racks or between adjacent racks, this BlueOptics cable delivers a fixed-length, low-latency link that reduces power consumption compared with active optical transceivers. The robust twinax construction provides consistent signal integrity for data center topologies that require reliable short-reach connectivity.

Advantages

The passive QSFP28 to QSFP28 cable offers simplified deployment with plug-and-play operation and no additional transceiver modules required. Its passive design minimizes power draw and heat generation in dense rack environments. The 3 m length provides a predictable, fixed connection for rack-to-rack or within-rack links, while the QSFP28 form factor supports 100G Ethernet and compatible high-speed protocols. The cable’s construction emphasizes signal stability and mechanical reliability for repeated insertion cycles.

Suitable for

• 100G switch-to-switch connections in data center racks
• Server uplinks where short, fixed-length copper links are preferred
• Rack-to-rack connections inside the same row or adjacent rows
• Environments prioritizing low latency and lower power consumption than active optics

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 3 m
• Cable type: Passive twinax copper
• Data rate: Designed for 100G links
• Typical use: Short-reach, within-rack and adjacent-rack interconnects

How to use

Install the cable by inserting each QSFP28 connector into the corresponding port on network devices until the latch engages. Ensure both devices are powered off or in maintenance mode if your deployment requires hot-swap avoidance, otherwise follow the equipment vendor’s hot-plug guidelines. Confirm link status in the device management interface and verify negotiated speed and lane configuration. For best results, route the cable to avoid sharp bends and excessive mechanical stress.

Recommendations

Use the 3 m passive DAC for short, fixed-length connections inside data center racks or between adjacent racks. Avoid extended exposure to temperatures or conditions outside the equipment specifications, and replace the cable if connectors show wear or if signal errors increase. For longer distances or fiber-based topologies consider active optical transceivers or fiber cabling solutions.