Network Cable BlueLAN Qlogic QSFP28-4SFP28-DAC-2M 100GBASE-CR4 2m Blue

The BlueLAN Qlogic QSFP28-4SFP28-DAC-2M 100GBASE-CR4 2m Blue is a passive Direct Attach Cable (DAC) engineered for high-density, short-reach connections in data centre and server environments. One end terminates in a QSFP28 connector while the opposite end breaks out to four SFP28 connectors, enabling a single 100G port to connect to multiple 25G ports. Constructed with AWG26 conductors and a 2 metre length, this cable supports 100GBASE-CR4 and 25GBASE-CR signalling with low insertion loss and predictable performance for top-of-rack, aggregation and switch-to-server links.

Advantages

This BlueLAN DAC offers a compact, power-free solution for high-speed interconnects, reducing the need for optical transceivers and active modules in short-reach applications. The QSFP28-to-4xSFP28 breakout design simplifies network architecture by enabling direct 100G-to-4x25G connectivity without additional conversion hardware. With AWG26 wiring and a passive copper build, the cable provides low latency and consistent electrical characteristics suitable for dense rack deployments.

Suitable for

• Top-of-rack switch to server connections in data centres
• High-performance computing clusters requiring short-reach 100G/25G links
• Switch aggregation where a 100G port is distributed to multiple 25G endpoints
• Environments where low-latency, power-saving interconnects are preferred

Key specifications

• Connector types: QSFP28 to 4 × SFP28
• Supported standards: 100GBASE-CR4 and 25GBASE-CR
• Cable length: 2 metres
• Conductor gauge: AWG26
• Construction: Passive direct attach copper breakout cable
• Typical application: Short-reach server and switch interconnects

How to use

Install the QSFP28 end into the 100G-capable QSFP28 port on the source device and insert the four SFP28 ends into the corresponding 25G SFP28 ports on the target devices. Ensure both devices are powered down or follow hot-plug recommendations from the equipment vendor before insertion if supported. Verify link status and speed settings on connected switches or NICs and configure port breakout or lane mapping if required by the host hardware.

Usage recommendations

Use this DAC for rack-level connections up to 2 metres to maintain signal integrity; avoid sharp bends and maintain recommended bend radius. Confirm compatibility with switch and server vendor breakout settings and firmware. For runs longer than 2 metres or where isolation and optical reach are required, consider active DACs or fibre solutions.