United States$5,000,000+
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Steven Hart
5
Excellent long-distance 40G performance over single-mode fiber.
QSFP-40G-LR4
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QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KM
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QSFP-40G-LR4
- Description:
- QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KM
- Rating:
Added to cart 28 times recently
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In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 12306855864
- Condition:
- Warranty:
- 3
- List Price:
$17,943.99
- Price:
$179.4499% off
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1
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QSFP-40G-LR4 Overview
QSFP-40G-LR4 is a QSFP optical transceiver module designed to support a 40G data rate. It features LC duplex connectors and utilizes single-mode fiber for long-range transmission—up to 10 km at a wavelength of 1310 nm—while supporting Ethernet protocols. Its standard QSFP form factor and rigorously defined physical dimensions make it well suited for high-speed optical networking requirements.
Engineered for demanding network environments, the QSFP-40G-LR4 is ideal for data centers, enterprise networks, and telecom infrastructures. It delivers reliable performance with controlled power consumption, an operating temperature range of 0 to 70°C, and a 3.3V input voltage, ensuring seamless integration and robust operation in high-density deployments.
QSFP-40G-LR4 price is $179.44, a 99% saving from the Cisco list price of $17,943.99. QSFP-40G-LR4 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-LR4 for additional pricing. Browse the full 40G Base Modules series or explore all Cisco products.
QSFP-40G-LR4 Specifications
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Product Type
- Transceiver
- Connector Type
- LC
- Supported Protocols
- Ethernet
- Network Interface
- Fiber
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco / Juniper / Huawei / Arista
- Wavelength
- 1310 nm
- Transmission Distance
- Long-Range
- Fiber Type
- Single-mode
- Max Distance
- 10 km
- Form Factor
- QSFP
- Data Rate
- 40G
- Power Consumption
- 4.0 W
- Product Name
- QSFP-40G-LR4
QSFP-40G-LR4 Use Case
Hyperscale Data Center Spine-Leaf Interconnect with QSFP-40G-LR4-QSFP
Scenario: A global cloud provider connects two hyperscale data halls located 8 km apart using the QSFP-40G-LR4-QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KM for spine-leaf aggregation. Benefit: Enables full-duplex 40 Gbps throughput with OTN framing and real-time error monitoring, slashing cross-connect hardware by 25% and delivering sub-microsecond latency for mission-critical workloads.
Metro Ethernet Backbone for Telecom Operators
Scenario: A regional telecom deploys the QSFP-40G-LR4-QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KM in its metro ring to offer 40 Gbps Ethernet services across city nodes up to 10 km apart. Benefit: Provides unified OTN/Ethernet transport over existing LC single-mode fiber, reduces inventory complexity by 30%, and ensures carrier-grade uptime with built-in forward-error correction and link-loss indication.
University Campus High-Performance Computing Backbone Upgrade
Scenario: A research university upgrades its campus backbone, connecting HPC clusters in three buildings separated by 7–9 km, using the QSFP-40G-LR4-QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KM. Benefit: Achieves seamless 40 Gbps connectivity over legacy fiber with OTN-based fault isolation, accelerating data-intensive research workflows by 40% and future-proofing the network for upcoming 100G upgrades.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| QSFP-40G-LR4 |  QSFP-40G-ER4= |  CVR-4SFP10G-QSFP= |  QSFP-H40G-AOC7M= |  QSFP-H40G-AOC2M | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP | QSFP | QSFP+ | QSFP | QSFP |
| Data Rate | 40G | 40G | 10G | 40G | 40G |
| Connector Type | LC | LC Duplex | LC | MPO | QSFP Direct Attach |
| Wavelength | 1310 nm | 1310 nm | 850 nm | N/A | 850nm |
| Transmission Distance | Long-Range | Extended-Range | Short-Range | Short-Range | Short-Range |
| Fiber Type | Single-mode | Single-mode | Multi-mode | N/A | Multi-mode |
| Max Distance | 10 km | 40 km | 300 meters | 7m | 2 meters |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Fiber | Fiber | Fiber | Ethernet | Ethernet |
| Power Consumption | 4.0 W | 3.5W | 3.5 W | N/A | N/A |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista |
| Product Name | QSFP-40G-LR4 | QSFP-40G-ER4= | CVR-4SFP10G-QSFP= | QSFP-H40G-AOC7M= | QSFP-H40G-AOC2M |
| Height | N/A | 0.55 inches | 0.7 inches | N/A | N/A |
| Width | N/A | 0.55 inches | 2.2 inches | N/A | N/A |
| Depth | N/A | 1.65 inches | 3.7 inches | N/A | N/A |
| Weight | N/A | 0.2 lbs | 0.3 lbs | N/A | N/A |
Reviews & Ratings
K
Kevin Martin
4
Stable optics for campus and inter-building links.
B
Brian Collins
4
Consistent signal strength with low error rates.
J
Jason White
5
Reliable module for extended reach deployments.
M
Mark Allen
5
Cisco-quality optics that perform as specified.
Questions & Answers
What is the QSFP-40G-LR4 OTN Transceiver?
The QSFP-40G-LR4 OTN Transceiver is a hot-pluggable 40GBASE-LR4 QSFP+ module supporting OTN networks over duplex LC single-mode fiber up to 10 km.
What transmission distance can the QSFP-40G-LR4 achieve over single-mode fiber?
This transceiver supports transmission distances of up to 10 kilometers over single-mode fiber.
Which fiber type and connector does the QSFP-40G-LR4 use?
It uses single-mode fiber and standard duplex LC connectors for optical interfaces.
What data rate is supported by the QSFP-40G-LR4?
The QSFP-40G-LR4 delivers an aggregate data rate of 40 Gbps using four 10 Gbps lanes.
What wavelengths does the QSFP-40G-LR4 operate on?
It operates at four CWDM wavelengths: 1271 nm, 1291 nm, 1311 nm, and 1331 nm.
Is the QSFP-40G-LR4 compliant with OTN standards?
Yes, it is fully compliant with OTN (ITU-T G.709) for optical transport applications.
Does the QSFP-40G-LR4 support digital diagnostic monitoring (DDM)?
Yes, it features digital diagnostic monitoring per the QSFP MSA for real-time optical parameter monitoring.
What is the operating temperature range of the QSFP-40G-LR4?
The operating temperature range is 0 °C to 70 °C (32 °F to 158 °F).
Is the QSFP-40G-LR4 hot-pluggable?
Yes, it is hot-pluggable, allowing insertion and removal without powering down the host equipment.
Which industry standards does the QSFP-40G-LR4 comply with?
It complies with IEEE 802.3ba 40GBASE-LR4, QSFP MSA, RoHS, and CE standards.
What is the typical power consumption of the QSFP-40G-LR4?
Typical power consumption is ≤3.5 W per module.
Is the QSFP-40G-LR4 RoHS compliant?
Yes, the module is RoHS-6 compliant for environmental safety.
Can the QSFP-40G-LR4 be used for data center interconnects?
Yes, it is ideal for data center interconnects, metro networks, and high-performance computing clusters.
Which network equipment vendors support the QSFP-40G-LR4?
The QSFP-40G-LR4 is compatible with major vendors' QSFP+ ports, including Cisco, Juniper, Arista, Huawei, and Brocade.
How do I install and configure the QSFP-40G-LR4 in a switch?
To install, slide the transceiver into a QSFP+ port, connect duplex LC fiber cables, and verify the link status through the host switch.