DAC cable CBO QSFP28-DAC-3M 3 m passive copper QSFP28 for short‑reach connections

BlueOptics DAC cable CBO QSFP28-DAC-3M is a 3 meter passive copper direct-attach cable with QSFP28 connectors, engineered for short-reach high-speed interconnects. Designed for environments where low latency and low power consumption are required, this cable provides a straightforward physical link for 100 Gigabit Ethernet connections between compatible switches, routers or network adapters. The passive construction eliminates active optical components, making it a cost-effective choice for rack-to-rack or chassis-to-chassis connections within a single equipment room or data center row.

Advantages

The passive copper design delivers low latency and minimal power overhead compared with active optics, while providing reliable signal integrity over the specified 3 m reach. QSFP28 connectors ensure compatibility with standard 100GbE QSFP28 ports and support direct interconnection without additional transceivers. The fixed-length cable reduces component count and simplifies installation and maintenance in dense networking deployments.

Suitable for

• Short-reach 100GbE links between top-of-rack or leaf switches
• Direct connection between routers and network adapters with QSFP28 ports
• High-density data center row interconnects and intra-rack cabling
• Lab environments and test setups requiring low-latency copper links

Key specifications

• Connector type: QSFP28 to QSFP28
• Cable type: Passive copper direct-attach (DAC)
• Length: 3 m
• Supported data rate: 100 Gigabit Ethernet (100GbE) compatibility
• Form factor: Fixed-length twinax/DAC cable for short reach
• Typical applications: Rack-to-rack and chassis-to-chassis interconnects

How to use

Install the cable by aligning and inserting each QSFP28 connector into the corresponding QSFP28 port on your network devices until the latch engages. Ensure both devices support passive DAC connections and are configured for the same link speed and lane settings. Avoid sharp bends and mechanical stress on the cable; maintain the recommended bend radius and secure the cable to prevent strain on the connectors. For troubleshooting, verify link status LEDs on connected equipment and check port settings in device management interfaces.

Recommendations

Use this 3 m passive QSFP28 DAC for short-distance interconnects inside the same rack or adjacent racks. Confirm compatibility with your switch or host vendor documentation regarding passive DAC support and port configuration before deployment.