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SRX-QSFP-40G-LR4
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40GE QSFP+ OPTICAL TRANSCEIVER
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Hand-picked by our procurement team for standout value. This unit is offered at our sharpest price on current stock, verified against live market rates.
Name:
SRX-QSFP-40G-LR4
- Description:
- 40GE QSFP+ OPTICAL TRANSCEIVER
- Rating:
Added to cart 28 times recently
- Availability:
2 In stock - Ready to Ship
- Brand:
- Juniper
- GTIN:
- 6091245547645
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$6,593.00
- Price:
$4,152.0037% off
Quantity:
1
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SRX-QSFP-40G-LR4 Overview
SRX-QSFP-40G-LR4 is a QSFP transceiver designed for 40G data transmission over long-range distances using LC connectors and single-mode fiber. It supports Ethernet protocols and is built in a compact form factor, making it ideal for high-performance data centers, enterprise networks, and telecommunications environments.
Engineered with a 1310nm wavelength laser, the SRX-QSFP-40G-LR4 module achieves a maximum transmission distance of up to 10km while maintaining low power consumption and precise physical dimensions. Its robust design and compatibility with leading network platforms ensure reliable long-range connectivity in modern high-speed networking applications.
SRX-QSFP-40G-LR4 price is $4,152.00, a 37% saving from the Juniper list price of $6,593.00. SRX-QSFP-40G-LR4 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for SRX-QSFP-40G-LR4 for additional pricing. Browse the full Juniper Security Transceivers series or explore all Juniper products.
SRX-QSFP-40G-LR4 Specifications
- Product Type
- Transceiver
- Brand
- Juniper
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- LC
- Wavelength
- 1310nm
- Transmission Distance
- Long-Range
- Fiber Type
- Single-mode
- Max Distance
- 10km
- Supported Protocols
- Ethernet
- Network Interface
- Ethernet
- Power Consumption
- 4.0W
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Juniper
- Product Name
- SRX-QSFP-40G-LR4
- Height
- 0.39 inches
- Width
- 0.78 inches
- Depth
- 1.42 inches
- Weight
- 0.1 lbs
SRX-QSFP-40G-LR4 Use Case
High-Density Data Center Inter-Rack 40G Connectivity
Cloud and enterprise data centers deploy the SRX-QSFP-40G-LR4-40GE QSFP+ transceiver to link spine and leaf switches across server pods up to 10 km apart over single-mode fiber. This module delivers IEEE 802.3ba-compliant 40 Gb/s throughput with low power (≤ 3.5 W) and compact QSFP+ form factor, enabling scalable east-west traffic, reduced latency, and optimized rack density for seamless VM migrations and microservice architectures.
Metro Ethernet 40G Aggregation for Service Providers
Telecom carriers integrate the SRX-QSFP-40G-LR4-40GE QSFP+ transceiver into metro aggregation rings to carry 40 Gb/s traffic between central offices over distances up to 10 km. By leveraging 4×10 Gb/s WDM channels, this LR4 module ensures robust link redundancy and cost-effective bandwidth scaling, delivers carrier-grade signal integrity, and simplifies network expansion without fiber re-cabling or chassis upgrades.
High-Performance Computing Cluster Backbone
Research institutions and financial firms use the SRX-QSFP-40G-LR4-40GE QSFP+ transceiver for backbone links in GPU/CPU-intensive clusters spanning campus or multi-building environments. Supporting low-latency 40 Gb/s transmission and up to 10 km reach, this LR4 module guarantees deterministic packet delivery and high spectral efficiency, accelerating parallel simulations, AI training jobs, and real-time analytics with minimal jitter and maximum throughput.
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Product Comparison Table 
| SRX-QSFP-40G-LR4 |  SRX-CFP-100G-LR4 |  SRX-SFP-10GE-LRM |  SRX-SFP-10GE-DAC-3M |  SRX-SFPP-10G-LR | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP | CFP | SFP+ | SFP+ | SFP+ |
| Data Rate | 40G | 100G | 10G | 10G | 10G |
| Transmission Distance | Long-Range | Long-Range | Short-Range | Short-Range | Long-Range |
| Max Distance | 10km | 10 km | 220 m | 3 meters | 10 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Ethernet | Fiber | Ethernet | Ethernet | Fiber |
| 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 | Juniper | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Juniper | Juniper |
| Product Name | SRX-QSFP-40G-LR4 | SRX-CFP-100G-LR4 | SRX-SFP-10GE-LRM | SRX-SFP-10GE-DAC-3M | SRX-SFPP-10G-LR |
Compliance & Warranty
100% Genuine Product Guarantee
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
L
Lawrence Whitely
4
40G LR4 QSFP performed reliably on SRX platform.
E
Edward Hollins
5
Stable long reach firewall interconnects.
S
Simon Redgrave
4
Good optical stability.
J
Julian Forster
5
Easy integration.
V
Victor Langdon
4
Met design goals.
Questions & Answers
What is the SRX-QSFP-40G-LR4 transceiver?
The SRX-QSFP-40G-LR4 is a 40 GbE QSFP+ optical transceiver that supports up to 10 km over single-mode fiber, offering high-density, low-power 40 Gigabit Ethernet connectivity.
Which devices are compatible with SRX-QSFP-40G-LR4?
SRX-QSFP-40G-LR4 is fully compliant with the QSFP+ MSA and works with major OEM switches and routers from Cisco, Juniper, Arista, HP and other 40 GbE platforms.
What transmission distance does SRX-QSFP-40G-LR4 support?
This transceiver supports optical links up to 10 km over single-mode fiber (SMF) using LC duplex connectors.
What wavelength does the SRX-QSFP-40G-LR4 use?
The SRX-QSFP-40G-LR4 uses four separate 1310 nm LAN-WDM wavelengths to deliver aggregated 40 Gbps throughput.
Is the SRX-QSFP-40G-LR4 hot-swappable?
Yes. The SRX-QSFP-40G-LR4 is hot-pluggable, allowing installation or removal without powering down the host system.
What connector type does SRX-QSFP-40G-LR4 use?
It uses a duplex LC connector interface, compatible with single-mode duplex fiber patch cords.
How much power does the SRX-QSFP-40G-LR4 consume?
Typical power consumption is 3.5 W, ensuring energy-efficient operation in high-density environments.
What operating temperature range does SRX-QSFP-40G-LR4 support?
The transceiver operates reliably from 0 °C to 70 °C (32 °F to 158 °F) ambient temperature.
Does the SRX-QSFP-40G-LR4 support digital diagnostics monitoring (DDM)?
Yes. It features full 2-wire serial digital diagnostics monitoring (DDM) compliant with SFF-8472 for real-time performance metrics.
What data rate does SRX-QSFP-40G-LR4 support?
It supports an aggregated data rate of 40 Gbps, with each lane operating at 10 Gbps for high-speed data transmission.
Is the SRX-QSFP-40G-LR4 MSA-compliant?
Yes. The module adheres to the QSFP+ MSA (Multi-Source Agreement), ensuring multi-vendor interoperability.
What applications are ideal for SRX-QSFP-40G-LR4?
Ideal applications include data center uplinks, aggregation, high-performance computing clusters and metro optical networks up to 10 km.
How do I install the SRX-QSFP-40G-LR4?
Align the module with the QSFP+ port, push until it clicks, connect LC fiber cables, and verify link status via your host device.
What is the mean time between failures (MTBF) of SRX-QSFP-40G-LR4?
The SRX-QSFP-40G-LR4 offers an MTBF exceeding 1 million hours, ensuring long-term reliability.
Does the SRX-QSFP-40G-LR4 come with a warranty?
Yes. It includes a limited lifetime warranty covering defects in materials and workmanship.
How does SRX-QSFP-40G-LR4 differ from SR4 transceivers?
Unlike SR4 modules optimized for multimode fiber, the LR4 version uses single-mode fiber at 1310 nm for longer reach up to 10 km.