Network Cable BlueLAN CAB-Q-4S-100G-2M QSFP28 to 4xSFP28 100GBASE-CR4 2M Blue

The BlueLAN CAB-Q-4S-100G-2M QSFP28 to 4xSFP28 100GBASE-CR4 2M Blue is a passive direct attach breakout cable designed for short-reach, high-speed interconnects in data center and enterprise switching environments. With a 2 meter length and AWG26 conductor construction, this cable provides a reliable physical link between a QSFP28 port and four SFP28 ports, enabling 100G to 4x25G breakout connections with low insertion loss and stable signal integrity.

Advantages

This passive breakout cable offers low power consumption since it requires no active components. The AWG26 wiring and optimized shielding deliver consistent performance and minimal crosstalk, while the 2 m length supports flexible rack-to-rack or within-rack connections. The QSFP28 to 4xSFP28 configuration simplifies upgrades and port-splitting for switches, routers, and NICs without additional transceivers.

Suitable for

• Aggregating or splitting 100G ports to 4x25G ports in data centers
• High-density top-of-rack switch interconnects
• Server to switch connections using QSFP28 and SFP28 interfaces
• Short-reach links where passive DACs are preferred

Key specifications

• Connector type: QSFP28 to 4× SFP28 passive breakout
• Data rate: 100GBASE-CR4 (breakout to 4×25GBASE-CR)
• Length: 2 meters
• Conductor gauge: AWG26
• Cable type: Passive direct attach copper
• Typical use: Short-reach, within-rack or adjacent-rack links

How to use

Insert the QSFP28 end into the 100G-capable QSFP28 port and plug each SFP28 connector into the corresponding 25G SFP28 ports. Ensure both ends are fully seated and that devices are powered down or support hot-plugging according to vendor guidelines. Verify link negotiation and interface status on connected devices; many systems will automatically detect the 4x25G breakout configuration. Avoid excessive bending near the connectors and secure the cable to prevent strain on ports.

Usage recommendations

Use this passive DAC for short-distance connections where low latency and low power are priorities. For runs beyond the recommended short-reach range or environments requiring electrical isolation, consider active optical solutions or fiber-based transceivers. Inspect connectors for debris before insertion and follow equipment vendor documentation for breakout port support and firmware compatibility.