Cisco QSFP-40G-SR4-S 40GBASE-SR4 QSFP+ Transceiver 40GbE MMF MPO

Cisco QSFP-40G-SR4-S — Enterprise-Class 40G QSFP+ Transceiver

Save up to 80% over new list price with this refurbished Cisco QSFP-40G-SR4-S 40GBASE-SR4 QSFP+ transceiver module, backed by Reef Telecom's industry-leading 10-year warranty. This enterprise-class S-Class module delivers reliable 40 Gigabit Ethernet connectivity for data centers, high-performance computing, and enterprise core networks.

Key Specifications

• Part Number: QSFP-40G-SR4-S
• Data Rate: 40 Gbps (4x10G lanes)
• Wavelength: 850nm
• Fiber Type: Multimode Fiber (MMF) — OM3, OM4, OM5
• Connector: MPO/MTP 12-fiber parallel
• Max Distance: 100m (OM3) / 150m (OM4/OM5)
• Form Factor: QSFP+ hot-pluggable
• Standards: IEEE 802.3ba 40GBASE-SR4
• 4x10G Breakout: Supports 10GBASE-SR interoperability via breakout cable

Why Choose This Module?

• Genuine Cisco enterprise-class (S-Class) optic — not a third-party compatible
• Hot-swappable design for zero-downtime installation
• Supports native 40G links or 4x10G breakout mode for flexible deployment
• Digital Diagnostic Monitoring (DDM) for real-time performance visibility

Why Buy from Reef Telecom?

• 10-Year Warranty — the longest in the industry on refurbished telecom gear
• Free Shipping on orders over $300
• Every module is professionally tested and inspected before shipping

Ideal for Cisco Nexus, Catalyst, ASR, and Firepower platforms requiring 40GbE short-reach multimode connectivity. Compatible with any switch or router accepting standard QSFP+ 40GBASE-SR4 modules.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.