DAC cable CBO QSFP28-DAC-0.5M 0.5m passive copper QSFP28 to QSFP28

BlueOptics DAC cable CBO QSFP28-DAC-0.5M is a 0.5 m passive copper direct attach cable with QSFP28 connectors on both ends. It is engineered for short-range 100 Gbps links and is suitable for direct connections between switches, routers and network adapters that provide QSFP28 ports. The cable offers a compact, low-power alternative to optical transceivers for top-of-rack and server-to-switch interconnects in data center environments.

Advantages

The passive copper construction delivers low latency and minimal power consumption compared with active optical modules, while the short 0.5 m length ensures minimal signal attenuation for reliable 100 Gbps transmission. Built with QSFP28 interfaces on both ends, the cable supports straightforward hot-plug installation and maintains electrical compatibility with standard QSFP28 ports. Its fixed-length form factor reduces inventory complexity and simplifies cabling in dense rack deployments.

Suitable for

• Short-range 100 Gbps links between switches in the same rack
• Server-to-switch connections in data center top-of-rack configurations
• High-density patching where low latency and low power are required
• Temporary or permanent direct attach links in lab and test environments

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 0.5 m
• Transmission: 100 Gbps passive copper DAC
• Latency: low-latency electrical interconnect
• Power: passive design with minimal power draw compared to active modules
• Usage environment: short-range, within-rack and adjacent-rack connections

How to use

Ensure both devices have compatible QSFP28 ports and proper link configuration before installation. With power to the connected devices turned on or off according to your site procedures, align the QSFP28 connector latches with the port and insert the cable straight into the port until the latch engages. Verify link status through the switch or adapter management interface and confirm 100 Gbps operation. For removal, depress the connector latch and withdraw the cable in a straight motion to avoid damaging the port.

Recommendations

Use this 0.5 m passive QSFP28 DAC for within-rack or adjacent-rack connections where 100 Gbps bandwidth, low latency and low power consumption are priorities. Avoid exceeding the intended short-reach use and route the cable to prevent sharp bends or mechanical strain on the QSFP28 connectors.