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 QSFP28 port to four SFP28 ports. At 2 meters length and constructed with AWG26 conductors, this cable provides a compact, low-latency copper connection for short-reach interconnects in racks and adjacent equipment. The design supports 100G Ethernet by aggregating four 25G lanes and is intended for use where power efficiency and predictable signal timing are required.

Advantages

This breakout DAC offers native support for 4x25G operation through a single QSFP28 connector, minimizing the need for additional transceivers or optical modules. As a passive cable, it consumes no extra power and produces minimal heat compared with active or optical alternatives. The 2 m length is suitable for direct rack-to-rack or within-rack connections, while the AWG26 conductors provide reliable signal integrity for 100GBASE-CR4 links. The blue jacket improves cable identification in dense cabling environments.

Suitable for

• Top-of-rack and end-of-row switch interconnects
• High-performance computing clusters requiring low-latency links
• Server-to-switch or switch-to-switch short-reach connections
• Environments where power efficiency and predictable timing are important

Key specifications

• Connector types: QSFP28 (one end) to 4 × SFP28 (other end)
• Standard supported: 100GBASE-CR4 (aggregated 4 × 25G lanes)
• Length: 2 meters
• Conductor gauge: AWG26
• Cable type: Passive direct attach copper breakout
• Color: Blue jacket for visual identification

How to use

Verify that the devices at each end support QSFP28 and SFP28 direct attach connections and that firmware or switch settings allow breakout operation (1×100G to 4×25G). Insert the QSFP28 end into the 100G port and the four SFP28 ends into the corresponding 25G ports, ensuring firm seating and that connectors are free of debris. Route the cable to avoid sharp bends and place it in cable management trays or panels to prevent strain. After connection, check link status on the devices and, if necessary, configure interfaces according to your network topology.

Usage recommendations

Use the cable for short-reach, high-bandwidth links inside racks or between adjacent racks; avoid exceeding the specified 2 m length for reliable performance. When installing in high-density environments, label both ends and maintain bend radii recommended for AWG26 copper cables. If longer distances or optical isolation are required, consider using optical transceivers and fiber cabling instead.