United StatesName:
Added to cart 28 times recently
In stock - Ready to Ship
$12,860.00
$713.0094.5% off
Quantity:
Business price:
3 Year Extended Warranty
Same-day Shipping
14-Day Money Back Guarantee
Shipping:
Payment:
3 Year Extended Warranty
Same-day Shipping
14-Day Money Back Guarantee
Need Additional Discount on Product?
Request a quote below - Get Exclusive Pricing and Support.
Shipping:
Payment:
QSFP-40G-LR4-S
QSFP 40GBASE-LR4 Trnscvr Mod. LC. 10km. Enterprise-Class
TRUSTED, TRIED, PROVEN
Inventory Delivered By
& Verified By
Solutions Powered By
QSFP-40G-LR4-S is a QSFP optical transceiver module engineered for 40G Ethernet applications. It employs LC connectors and leverages four separate optical channels optimized for single-mode fiber, making it ideally suited for long-range transmission environments.
QSFP-40G-LR4-S supports a 40G data rate and is designed in a QSFP form factor with standardized physical dimensions for data centers, enterprise networks, and telecom deployments. It meets stringent protocol requirements for Ethernet while offering reliable performance over extended distances.
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.
To get the detailed certification, please go to the Compliance Center.
 QSFP-40G-LR4-S |  QSFP-40G-CSR-S= |  CVR-CFP-4SFP10G= |  CFP-40G-FR= |  QSFP-40G-SR-BD= | |
|---|---|---|---|---|---|
| Compatibility | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | N/A | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 40G | 40G | 10G | 40G | 40G |
| Depth | N/A | 2.85 inches | N/A | 7.5 inches | N/A |
| Fiber Type | Single-mode | Multi-mode | N/A | Single-mode | Multi-mode |
| Form Factor | QSFP | QSFP | CFP | CFP | QSFP |
| Height | N/A | 0.33 inches | N/A | 1.2 inches | N/A |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 10 km | 100 meters | N/A | 10 km | 150 meters |
| Network Interface | Ethernet | Fiber | Ethernet | Fiber | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 5.0 W | 3.5W | N/A | 6.0W | 3.8W |
| Product Name | QSFP-40G-LR4-S | QSFP-40G-CSR-S= | CVR-CFP-4SFP10G= | CFP-40G-FR= | QSFP-40G-SR-BD= |
| 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 | 850nm | N/A | 1310nm | 850nm |
| Weight | N/A | 0.1 lbs | N/A | 1.5 lbs | N/A |
| Width | N/A | 0.64 inches | N/A | 4.4 inches | N/A |
QSFP-40G-LR4-S delivered stable 40G connectivity over 10km. Clean optical levels and seamless integration into our enterprise core.
Reliable 40GBASE-LR4 performance with consistent throughput across single-mode fiber.
Strong signal integrity and predictable latency in production workloads.
Integrated easily into our aggregation switches. Solid 40GbE long-range solution.
Excellent 10km reach with dependable performance under peak traffic.
Enterprise-class optics maintaining stable 40G bandwidth.
Clean installation and reliable long-distance 40G connectivity.
The QSFP-40G-LR4-S is an enterprise-class QSFP 40GBASE-LR4 optical transceiver module supporting 40 Gbps links over single-mode fiber up to 10 km with an LC duplex interface.
This module supports a maximum single-mode fiber link length of 10 kilometers at 40 Gbps when used with compliant LC-terminated fiber.
It uses a standard dual LC connector interface, ensuring broad compatibility with existing single-mode fiber infrastructure.
The QSFP-40G-LR4-S complies with IEEE 802.3ba 40GBASE-LR4 and MSA specifications for the QSFP form factor.
It employs four LAN-WDM channels centered at 1295 nm, 1300 nm, 1305 nm, and 1310 nm for 40 Gbps aggregate throughput.
Single-mode fiber (SMF) with a core diameter of 9 µm and an LC duplex terminations is required to achieve the specified 10 km range.
Typical power consumption is ≤3.5 Watts, classifying it as an energy-efficient, enterprise-grade QSFP transceiver.
Yes. It features a built-in DDM interface (per SFF-8436) providing real-time monitoring of optical power, temperature, voltage, and more.
Yes. The module supports hot-plug functionality, allowing insertion or removal without powering down the host system.
It operates reliably between 0 °C and 70 °C ambient temperatures, suitable for most enterprise data-center environments.
Ideal applications include 40 GbE aggregation, core switching, data-center interconnects, and high-performance computing networks.
Power down the port (if required), insert the QSFP module into the QSFP+ cage until it clicks, then connect LC fiber cables to the transmit and receive ports.
Yes. It meets industry QSFP MSA and IEEE standards, ensuring interoperability with compliant switches, routers, and optical gear.
Diagnostics include real-time Tx/Rx optical power, laser bias current, supply voltage, module temperature, and transceiver Rx sensitivity.
The QSFP-40G-LR4-S is an enterprise-class revision offering tighter component tolerances, extended DDM accuracy, and enhanced MTTF over standard LR4 modules.
Yes. The module is backed by a one-year limited warranty covering manufacturing defects and performance compliance.