InfiniBand/fibre optic cable Cisco QSFP-4SFP25G-CU3M 3 m 4xSFP25G Black

The Cisco QSFP-4SFP25G-CU3M is a 3 m copper direct-attach breakout cable that terminates in one QSFP connector and four SFP25G connectors. Designed for very short links inside racks and between adjacent racks, the cable provides a cost-effective wired connection option for Cisco switches and servers supporting 100G QSFP and 25G SFP ports. The cable is intended for high-density environments where consolidating a 100G port into four 25G links reduces cabling complexity and cost.

Advantages

This passive breakout cable offers a simple and reliable method to split a 100G QSFP port into four independent 25G SFP links without active electronics, lowering power consumption and complexity. Available in a 3 m length, it supports short-reach connections within and between racks, is compatible with Cisco QSFP and SFP25G ports, and provides a compact and durable black construction for professional installations.

Suitable for

• Connecting a 100G QSFP port to four 25G SFP ports within the same rack
• Linking adjacent racks or short data center runs (very short links)
• High-density switch-to-server or switch-to-switch breakout connections
• Environments where passive low-power cabling is required

Key specifications

• Model: QSFP-4SFP25G-CU3M
• Length: 3 m
• One QSFP connector to four SFP25G connectors
• Cable type: Copper direct-attach (passive)
• Bandwidth: 100G to 4 × 25G breakout
• Color: Black
• Manufacturer: Cisco
• MPN: QSFP-4SFP25G-CU3M=
• EAN: 0882658836534

How to use

Insert the QSFP end into the 100G QSFP port on the Cisco switch and insert each SFP25G connector into the corresponding 25G SFP ports on the target switches or servers. Ensure ports are powered down or follow live insertion guidance from Cisco platform documentation. Verify link status and configure port settings on the devices as required by your network topology and operating system.

Recommendations

Use this passive breakout cable only for short-reach connections (within racks or between adjacent racks). Confirm compatibility with your Cisco platform and firmware, avoid excessive bending or strain on the cable, and follow Cisco’s guidelines for grounding and cable management to maintain reliable operation.