Network Cable BlueLAN QSFP28-4SFP28-DAC-2M QSFP28 to 4x25GBASE-CR SFP28 Direct Attach Breakout Cable 2m Blue

The BlueLAN QSFP28-4SFP28-DAC-2M is a passive 100GBASE-CR4 direct attach breakout cable that links a single QSFP28 port to four independent SFP28 ports. Designed for short-reach, high-density connections, the 2 meter cable uses AWG26 conductor construction and maintains signal integrity for aggregated 100G links or split 4×25G connections. The cable is intended for use in rack, top-of-rack or leaf-spine network topologies where compact, low-latency interconnects are required.

Advantages

The BlueLAN QSFP28 to 4×25G SFP28 DAC provides a simple, power-free method to convert one 100G QSFP28 interface into four 25G SFP28 links without active electronics. Its AWG26 wiring and 2 m length offer a predictable channel performance for short-range server-to-switch or switch-to-switch connections. The breakout design reduces port adapter complexity and saves rack space while delivering the bandwidth aggregation needed for high-performance computing and virtualization environments.

Suitable for

• Data center top-of-rack and leaf-spine interconnects
• High-performance computing clusters and GPU servers
• Switch-to-switch consolidation where 100G to 4×25G breakout is required
• Low-latency storage and virtualization uplinks

Key specifications

• Connector types: QSFP28 (one end) to 4 × SFP28 (other end)
• Supported link standard: 100GBASE-CR4 / 4×25GBASE-CR
• Length: 2 meters
• Cable construction: AWG26 conductor
• Form factor: Passive direct attach cable (breakout DAC)
• Typical use: Short-reach copper interconnect, within rack or between adjacent racks

How to use

Insert the QSFP28 end into the 100G-capable QSFP28 port and plug each SFP28 connector into the corresponding 25G-capable SFP28 ports on the target device. Ensure ports and devices support passive DAC and the intended link speeds, and verify port mapping in the host or switch configuration so each 25G channel is recognized. No external power or transceivers are required; handle the cable by the connectors and avoid sharp bends or pulling on the cable body to preserve performance.

Usage recommendations

Use in environments with short cable runs (within racks or between adjacent racks) and where passive breakout cables are supported by network equipment. Maintain bend radius and secure cable routing to prevent signal degradation. For longer distances or where active electronics are required, consider optical transceivers or active DAC alternatives.