Network Cable BlueLAN CAB-Q28-S28-2M QSFP28 to 4xSFP28 100GBASE-CR4 2M Blue

The BlueLAN CAB-Q28-S28-2M QSFP28 to 4xSFP28 100GBASE-CR4 2M Blue is a 2-meter passive direct attach breakout cable engineered for high-speed short-reach links. It terminates in a single QSFP28 plug and four SFP28 plugs, enabling a 100GBASE-CR4 connection to split into four independent 25GBASE-CR channels. Constructed with AWG26 conductors and designed for minimal insertion loss, this cable is intended for reliable, low-latency connections inside racks and between adjacent switches or servers in data center and high-performance computing installations.

Advantages

This passive breakout cable provides a compact and cost-effective way to deliver 100G connectivity by aggregating or splitting signals between QSFP28 and SFP28 ports without requiring active components. The AWG26 construction offers consistent electrical characteristics for stable signal transmission and reduced attenuation across short distances. With a standardized QSFP28-to-4xSFP28 pinout and a 2 m length, the cable simplifies cabling layouts, reduces the need for additional transceivers, and supports hot-pluggable interoperability with compatible equipment.

Suitable for (tasks / use cases)

• Connecting a 100G QSFP28 port to four 25G SFP28 ports for switch-to-switch or switch-to-server links
• Top-of-rack and end-of-row short-reach interconnects within data centers
• High-performance computing clusters requiring multi-lane 25G channels
• Environments where passive DACs reduce power consumption and complexity

Key specifications

• Cable type: Passive direct attach breakout cable (DAC)
• Length: 2 meters
• Connector A: QSFP28 plug
• Connector B: 4 × SFP28 plugs
• Supported standards: 100GBASE-CR4 to 4×25GBASE-CR
• Conductor gauge: AWG26
• Usage range: Short-reach, within racks or adjacent racks

How to use

Insert the QSFP28 end into the 100G-capable QSFP28 port on your switch or network device, and insert each SFP28 plug into the corresponding 25G ports on target switches or servers. Ensure devices are powered and support passive breakouts; the cable is hot-pluggable but should be handled gently to avoid bending near connectors. Verify link status on connected equipment and configure port aggregation or individual lane settings as required by your network architecture.

Usage recommendations

Use this 2 m passive breakout cable for short-distance, intra-rack and adjacent-rack connections where low latency and minimal power consumption are priorities. Avoid routing the cable through dense cable bundles with tight bends; maintain manufacturer-recommended bend radius and keep connectors free of dust when not in use.