Network Cable BlueLAN QSFP-4SFP25G-CU2M QSFP28 to 4x25GBASE-CR 2M Black

The BlueLAN QSFP-4SFP25G-CU2M is a passive 100GBASE-CR4 direct-attach breakout cable with a QSFP28 connector on one end and four SFP28 connectors on the other. At 2 meters length and AWG26 gauge, this cable supports aggregation and cross-connect applications between 100G ports and four separate 25G ports. It is intended for short-reach, high-density interconnects in racks and data center topologies where low latency and predictable signal integrity are required.

Advantages

This passive breakout cable delivers a cost-effective solution for converting a single 100G QSFP28 port into four independent 25G links without intermediate transceivers. Its AWG26 conductor construction and 2 m length reduce insertion loss and crosstalk for reliable electrical performance. The direct-attach design simplifies cabling, reduces space requirements and minimizes power consumption compared with optical transceivers and active DAC options.

Suitable for

• Connecting 100G QSFP28 ports to four 25G SFP28 ports in switches and servers
• Top-of-rack and end-of-row short-reach data center links
• High-performance computing clusters requiring multiple 25G lanes
• Equipment interconnects where passive, low-latency cabling is preferred

Key specifications

• Topology: QSFP28 to 4 × SFP28 passive breakout
• Data rate: 100G aggregated (4 × 25G lanes)
• Length: 2 meters
• Conductor gauge: AWG26
• Cable type: Direct attach copper (passive)
• Typical use: Short-reach electrical interconnects
• Color: Black

How to use

Insert the QSFP28 connector into the 100G QSFP28 port and plug each SFP28 connector into the corresponding 25G ports on the target devices. Ensure ports are rated for passive DAC usage and that link settings (speed, lanes) on switches and servers are configured to accept 25G connections or auto-negotiation is enabled. Avoid excessive bending near the connector ends and route the cable to prevent mechanical strain.

Usage recommendations

Use this cable for short-distance, high-density interconnects inside racks and between adjacent racks. Verify compatibility with your switch and server vendor for passive DAC support, and keep cable length to the specified 2 m to maintain signal integrity. For longer runs or where vendor compatibility is uncertain, consider optical transceivers or active DAC alternatives.