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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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Name:
QSFP-40G-LR4-S=
- Description:
- QSFP 40GBASE-LR4 TRNSCVR MOD LC 10KM ENTERPRISE CLASS
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 714752586605
- Condition:
- Warranty:
- 3
- List Price:
$12,860.00
- Price:
$713.0094.5% off
Quantity:
1
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QSFP-40G-LR4-S= Overview
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.
QSFP-40G-LR4-S= Specifications
- Product Type
- Transceiver
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- LC
- Wavelength
- 1310 nm
- Transmission Distance
- Long-Range
- Fiber Type
- Single-mode
- Max Distance
- 10 km
- Supported Protocols
- Ethernet
- Network Interface
- Ethernet
- Power Consumption
- N/A
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco / Juniper / Huawei / Arista
- Product Name
- QSFP-40G-LR4-S=
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
 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 |
Reviews & Ratings
B
Blake Turner
5
Consistent long-range throughput with clean LC connectivity.
C
Calvin Price
5
Smooth integration into our core switching layer.
D
Damon Brooks
4
Maintained dependable signal levels across extended fiber runs.
E
Elliot King
5
High quality 40G transceiver for backbone upgrades.
F
Frank Reed
5
Reliable long-haul connectivity with predictable latency.
G
Grant Hayes
5
Excellent enterprise-class optical performance.
Questions & Answers
What is the QSFP-40G-LR4-S= transceiver module?
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.
Which fiber type does the QSFP 40GBASE-LR4 use?
The QSFP 40GBASE-LR4 uses single-mode fiber (SMF) with LC duplex connectors to achieve 40 Gbps transmission over distances up to 10 km.
What is the maximum reach of the QSFP-40G-LR4-S=?
The QSFP-40G-LR4-S= supports a maximum link distance of 10 kilometers over single-mode fiber, ensuring reliable long-reach connectivity.
What wavelength does the 40GBASE-LR4 transceiver operate at?
The 40GBASE-LR4 transceiver operates over four wavelengths around 1310 nm, using coarse wavelength division multiplexing (CWDM) to deliver 40 Gbps.
Is the QSFP-40G-LR4-S= hot-swappable?
Yes, the QSFP-40G-LR4-S= is fully hot-swappable, allowing you to install or remove the module without powering down your switch or server.
Which switches and routers are compatible with QSFP-40G-LR4-S=?
The QSFP-40G-LR4-S= is interoperable with major switch and router brands that support QSFP+ ports, including Cisco, Juniper, Arista, HPE, and Dell.
What applications are ideal for the 40GBASE-LR4 module?
The 40GBASE-LR4 is ideal for data center aggregation, long-haul campus links, high-performance computing clusters, and enterprise backbone networks.
How much power does the QSFP-40G-LR4-S= consume?
The QSFP-40G-LR4-S= typically consumes less than 3.5 W of power, delivering energy-efficient 40 Gbps performance in enterprise environments.
What does “enterprise class” mean for this transceiver?
“Enterprise class” indicates robust manufacturing, extended temperature range, high MTBF, and strict quality testing for mission-critical network deployments.
What are the operating temperature specifications?
The QSFP-40G-LR4-S= operates reliably from 0 °C to 70 °C (32 °F to 158 °F), ensuring stable performance in standard data center environments.
Which standards and protocols does the 40GBASE-LR4 comply with?
The 40GBASE-LR4 complies with IEEE 802.3ba for 40 GbE and MSA specifications for QSFP+ transceivers, ensuring full protocol interoperability.
What is the module’s mean time between failures (MTBF)?
The QSFP-40G-LR4-S= boasts an MTBF exceeding 1,000,000 hours, reflecting its high reliability and suitability for continuous operation.
Can I use this module with legacy 10G ports?
No, the QSFP-40G-LR4-S= is designed exclusively for 40 Gbps QSFP+ ports and is not backward-compatible with 10 GbE SFP+ interfaces.
How do I install the QSFP+ LR4 transceiver?
To install, hot-swap the QSFP-40G-LR4-S= into an available QSFP+ port, secure it until the latch clicks, and connect LC single-mode fiber cables.
What diagnostic features does the module support?
The QSFP-40G-LR4-S= supports Digital Diagnostics Monitoring (DDM), providing real-time data on temperature, voltage, bias current, and optical power.
Does the QSFP-40G-LR4-S= include a warranty?
Yes, the QSFP-40G-LR4-S= comes with a standard one-year warranty covering defects in materials and workmanship for peace of mind.