Cisco QSFP-100G-CWDM4-S — 100G CWDM4 QSFP28 Optical Transceiver

Save significantly over new pricing on this fully tested Cisco QSFP-100G-CWDM4-S 100GBASE-CWDM4 transceiver module, backed by Reef Telecom's industry-leading 10-year warranty. Delivers reliable 100 Gigabit Ethernet connectivity up to 2km over single-mode fiber with duplex LC connectors — ideal for data center interconnects, high-performance computing, and enterprise core networks.

Technical Specifications

• Part Number: QSFP-100G-CWDM4-S
• Form Factor: QSFP28 (hot-swappable plug-in module)
• Data Rate: 100Gbps (4 x 25Gbps NRZ channels)
• Wavelengths: 1271, 1291, 1311, 1331nm (CWDM4)
• Max Distance: 2km over G.652 single-mode fiber (SMF)
• Connector: Duplex LC/UPC
• Digital Diagnostics: DOM/DDM via I2C interface
• Power Consumption: ≤3.5W
• Operating Temp: 0°C to 70°C
• Standards: IEEE 802.3bm, 100G CWDM4 MSA, SFF-8636, SFF-8661

Key Advantages

• Duplex LC connectors simplify cabling vs. MPO-based parallel optics
• Four multiplexed wavelengths reduce fiber requirements by 75%
• Lower cost alternative to 100G-LR4 for distances under 2km
• Hot-swappable design enables zero-downtime maintenance
• CWDM4 MSA compliant for broad interoperability

Why Buy from Reef Telecom?

• 10-Year Warranty — the longest in the refurbished telecom industry
• Free Shipping on orders over $300
• Every unit fully tested and inspected before shipment
• Bulk pricing available for large-scale deployments

Compatibility & Use Cases

The QSFP-100G-CWDM4-S is compatible with Cisco Nexus 9000, Catalyst 9500, NCS 5500, and other Cisco platforms with QSFP28 ports. Interoperable with the Cisco QSFP-100G-SM-SR module. Ideal for data center spine-leaf fabrics, campus backbone links, inter-building interconnects, and high-performance computing clusters.

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.