Cisco QSFP-4SFP10G-CU3M 40G QSFP+ to 4x10G SFP+ Cable

• Brand: Cisco
• Item / Model: QSFP-4SFP10G-CU3M
• Cisco Product Family: QSFP-to-4×SFP+ passive copper breakout cable
• Cable Type: Passive direct-attach copper
• Host Interface: QSFP+
• Breakout Interfaces: 4 × SFP+
• Breakout Speed: 4 × 10GbE
• Cable Length: 3 meters
• Conductor / Cable Gauge: 30 AWG
• QSFP-End Cable Diameter: 7 mm
• QSFP-End Bend Radius: 50 mm
• QSFP-End Faceplate Distance: 100 mm
• SFP-End Cable Diameter: 5 mm
• SFP-End Bend Radius: 45 mm
• SFP-End Faceplate Distance: 70 mm
• Jacket Material: PVC
• Jacket Color: Black
• Compatibility: Cisco 40G QSFP+ platforms supporting this breakout cable
• Comparable Passive Models: QSFP-4SFP10G-CU1M, CU3M, CU5M
• Longer Active Alternatives: QSFP-4X10G-AC7M, QSFP-4X10G-AC10M
• Primary Deployment: Short-reach data-center / switching connectivity

Why Choose This Product?

• Purpose-built 40G-to-10G breakout: Gives infrastructure teams a defined method of connecting one supported 40G QSFP+ port to four 10G SFP+ interfaces.
• Better port utilization: Four 10G breakout links from one QSFP+ port can help increase connectivity density in supported data-center architectures.
• Passive copper architecture: Appropriate for short-reach connections where optical cabling or active cable electronics are not required.
• 3m deployment flexibility: Offers more physical reach than the 1m passive variant while remaining within Cisco's passive copper breakout family.
• Simpler procurement: The exact Cisco SKU, QSFP+ interface and four-SFP+ breakout topology make BOM and replacement identification straightforward.
• Reduced unnecessary optical complexity: For suitable short-distance deployments, passive copper provides a direct physical connectivity option without introducing optical modules.
• Designed for Cisco environments: The model is documented by Cisco across its 40G networking and UCS-related product documentation. 
• Useful for phased infrastructure: Supports architectures where 40G aggregation needs to connect with multiple 10G interfaces, helping organizations use existing 10G connectivity while deploying 40G-capable switching.