InfiniBand/fibre optic cable BlueOptics QFX-Q-S-DAC-3M-BL 3m QSFP28 4xSFP28 Male/Male

The BlueOptics QFX-Q-S-DAC-3M-BL is a 3 m direct attach cable (DAC) with a QSFP28 plug on one end and four SFP28 plugs on the other, providing a straightforward solution for short-range 100G connections. This passive twinax copper cable implements 100GBase-CR4 / 4x25GBASE-CR signaling and is intended for linking compatible switches, routers and storage systems inside racks or between adjacent racks where a 3-meter copper DAC meets the required transmission protocol.

Advantages

This passive DAC offers a low-power, low-latency connection for short-distance 100G and 4x25G links and is built to MSA-compliant mechanical standards. The cable is manufactured using high-quality components and is tested for compatibility with hardware that supports the equivalent Juniper QFX-Q-S-DAC-3M reference cable. Its passive design reduces complexity and failure points compared with active optical assemblies, simplifying installation and maintenance in data center environments.

Suitable for

Key specifications

How to use

Insert the QSFP28 plug into the host QSFP28 port and insert the four SFP28 plugs into their corresponding SFP28 ports or a breakout module following equipment guidelines. Ensure both devices support passive DAC connections and the intended protocol (100GBase-CR4 or 4×25GBASE-CR). Avoid excessive bending or mechanical strain on the cable and verify link state in the network equipment management interface after installation.

Recommendations

Use this cable for short physical runs (up to 3 m) inside racks or between adjacent racks; confirm passive DAC support in device documentation and perform a link test after installation. Store and route the cable to avoid sharp bends and protect connector ends from contamination when not connected.