DAC cable CBO QSFP28-DAC-3M 3 m compatible with QNAP QSFP28 ports, passive direct attach copper cable

The DAC cable CBO QSFP28-DAC-3M is a 3-meter passive direct attach copper connection compatible with QNAP QSFP28 ports. It is intended for short-reach, high-speed links between switches, storage arrays and network appliances using QSFP28 interfaces. The cable provides a straightforward plug-and-play copper link that reduces power consumption and latency compared with optical transceivers while simplifying installation in racks and network closets.

Advantages

This passive direct attach copper cable offers low latency and low power operation because it eliminates the need for separate optical modules and transceivers. Its 3 m length covers common rack-to-rack and chassis-to-chassis short links without excess cable slack. The QSFP28 connector profile ensures compatibility with devices that accept QSFP28 ports and supports high data rates typical for 100GbE and related applications. The cable’s passive construction also leads to lower cost of ownership for short-distance connections.

Suitable for

• Short-reach links between switches and routers in data center racks
• Direct connections between storage systems and network appliances with QSFP28 ports
• Top-of-rack to aggregation switch cabling within the same room or cabinet
• High-bandwidth server-to-switch connections requiring minimal latency

Key specifications

• Connector type: QSFP28 to QSFP28 compatible
• Cable type: passive direct attach copper (DAC)
• Length: 3 meters
• Designed for short-reach, high-speed links (suitable for 100GbE-class applications)
• Power profile: low power compared with optical transceivers due to passive design
• Installation: rack and network closet friendly, plug-and-play operation

How to use

Install the DAC cable by inserting each QSFP28 connector into the corresponding QSFP28 port on the devices to be connected. Ensure both devices are powered down or follow hot-plug guidelines provided by the hardware vendor if live insertion is supported. Align the connector latch and seat it until it clicks into place. Verify link status on the connected devices and check for any port-specific configuration required by the switch or storage appliance.

Recommendations

For optimal performance, use this 3 m passive DAC cable for connections within the same rack or adjacent racks to avoid unnecessary signal attenuation. Avoid sharp bends and mechanical strain on the cable; maintain the manufacturer’s minimum bend radius and secure the cable to prevent movement. Confirm that the connected devices support passive QSFP28 DACs and consult device documentation for any port compatibility notes.