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Stable 40GBASE-LR4 performance over 10km SMF. Reliable enterprise-grade optics.
QSFP-40G-LR4-S=
QSFP 40GBASE-LR4 TRNSCVR MOD LC 10KM ENTERPRISE CLASS
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QSFP-40G-LR4-S=
QSFP 40GBASE-LR4 TRNSCVR MOD LC 10KM ENTERPRISE CLASS
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QSFP-40G-LR4-S= is a high-performance QSFP transceiver engineered for 40G Ethernet connectivity, offering long-range transmission capabilities over single-mode fiber. It features LC connectors, supports Ethernet protocols, and is designed in a compact form factor ideal for integration into data centers, enterprise networks, and telecom environments.
QSFP-40G-LR4-S= delivers robust 40G data rates with long‐reach performance—up to 10 km over single-mode fiber—making it a reliable solution for high-speed network interconnects. Its engineering meets stringent operational standards with compatibility across leading vendor platforms, ensuring seamless deployment in mission-critical applications.
QSFP-40G-LR4-S= price is $713.00, a 94.5% saving from the Cisco list price of $12,860.00. QSFP-40G-LR4-S= is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-LR4-S= for additional pricing. Browse the full Cisco 40G Optical Modules series or explore all Cisco products.
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 QSFP-40G-LR4-S= |  CVR-CFP-4SFP10G= |  QSFP-40G-BD-RX= |  CFP-40G-FR= |  CFP-40G-SR4= | |
|---|---|---|---|---|---|
| Compatibility | Cisco / Juniper / Huawei / Arista | N/A | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 40G | 10G | 40G | 40G | 40G |
| Depth | N/A | N/A | N/A | 7.5 inches | N/A |
| Fiber Type | Single-mode | N/A | Multi-mode | Single-mode | Multi-mode |
| Form Factor | QSFP | CFP | QSFP | CFP | CFP |
| Height | N/A | N/A | N/A | 1.2 inches | N/A |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 10 km | N/A | 100 meters | 10 km | 100 m |
| Network Interface | Ethernet | Ethernet | Fiber | Fiber | Fiber |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | N/A | N/A | N/A | 6.0W | 6.5W |
| Product Name | QSFP-40G-LR4-S= | CVR-CFP-4SFP10G= | QSFP-40G-BD-RX= | CFP-40G-FR= | CFP-40G-SR4= |
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet, Fibre Channel | Ethernet |
| Transmission Distance | Long-Range | Short-Range | Short-Range | Long-Range | Short-Range |
| Wavelength | 1310 nm | N/A | 850nm | 1310nm | 850 nm |
| Weight | N/A | N/A | N/A | 1.5 lbs | N/A |
| Width | N/A | N/A | N/A | 4.4 inches | N/A |
Stable 40GBASE-LR4 performance over 10km SMF. Reliable enterprise-grade optics.
Consistent long-range throughput with clean LC connectivity.
Smooth integration into our core switching layer.
Maintained dependable signal levels across extended fiber runs.
High quality 40G transceiver for backbone upgrades.
Reliable long-haul connectivity with predictable latency.
Excellent enterprise-class optical performance.
The QSFP-40G-LR4-S= is a 40GBASE-LR4 QSFP+ transceiver module designed for single-mode fiber links up to 10 km, featuring LC duplex connectors and enterprise-class reliability.
The QSFP 40GBASE-LR4 uses single-mode fiber (SMF) with LC duplex connectors to achieve 40 Gbps transmission over distances up to 10 km.
The QSFP-40G-LR4-S= supports a maximum link distance of 10 kilometers over single-mode fiber, ensuring reliable long-reach connectivity.
The 40GBASE-LR4 transceiver operates over four wavelengths around 1310 nm, using coarse wavelength division multiplexing (CWDM) to deliver 40 Gbps.