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ProductsCisco QSFP-40G-LR4-S= 40GBASE-LR4 QSFP+ optical transceiver
QSFP-40G-LR4-S=1
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Cisco QSFP-40G-LR4-S= 40GBASE-LR4 QSFP+ optical transceiver

Cisco QSFP-40G-LR4-S, QSFP-40G-LR4-S=, Cisco 40G LR4 module, 40GBASE-LR4 transceiver, 40G single mode QSFP+, Cisco long distance optical module, data center interconnect 40G

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🚀 Long-Range 40G Connectivity for Data Center Interconnect | Cisco QSFP-40G-LR4-S=

Reliable 40G Transmission Over Single-Mode Fiber Up to 10km

The Cisco QSFP-40G-LR4-S= is an original 40GBASE-LR4 QSFP+ optical transceiver designed for long-distance transmission over single-mode fiber (SMF).
Using CWDM (Coarse Wavelength Division Multiplexing) technology, it transmits 4 independent wavelengths over a duplex LC fiber, enabling distances of up to 10 kilometers, making it ideal for data center interconnect (DCI), metro networks, and enterprise backbone links.
Engineered by Cisco Systems, this module ensures stable, high-performance connectivity across long-distance infrastructure.


🔥 Why This Product Drives High-Value Orders

✔ Need 40G over long distances? ✔ Connecting multiple data centers? ✔ Building metro or backbone networks?
👉 LR4 = the standard choice for long-distance 40G deployment


⚡ SR vs LR vs ER (Buyer Decision Section)

Type
Distance
Fiber
Use Case
SR
≤150m
MMF
Inside data center
LR4
10km
SMF
DCI / campus backbone
ER4
40km
SMF
Carrier networks
👉 If distance > 150m → LR4 is the right choice


🧠 Key Features of Cisco QSFP-40G-LR4-S=

  • Data Rate: 40 Gbps
  • Technology: CWDM (4 wavelengths)
  • Wavelength: 1271 / 1291 / 1311 / 1331 nm
  • Distance: Up to 10 km
  • Connector: LC Duplex
  • Fiber Type: Single-mode fiber (SMF)
  • Form Factor: QSFP+
  • Digital Optical Monitoring (DOM): Supported
  • Hot-swappable
  • Designed for Cisco platforms


🏗️ High-Value Application Scenarios

1. Data Center Interconnect (DCI)

  • Connect geographically separated data centers
  • High bandwidth + stable transmission

2. Metro Networks

  • City-level backbone connectivity
  • Reliable long-distance links

3. Enterprise Backbone

  • Campus inter-building connections
  • Long-distance aggregation

4. Telecom Infrastructure

  • Carrier-grade 40G deployment
  • Backbone transmission


🧩 Complete 40G Long-Distance Solution

✅ Optical Modules

  • Cisco QSFP-40G-LR4-S=
  • Cisco QSFP-40G-ER4 (for longer reach)

✅ Cabling

  • LC-LC single-mode fiber (OS2)

✅ Equipment

  • 40G core switches
  • Data center aggregation switches


📊 Technical Specifications

Parameter
Specification
Form Factor
QSFP+
Data Rate
40 Gbps
Standard
40GBASE-LR4
Wavelength
1271 / 1291 / 1311 / 1331 nm
Max Distance
10 km
Connector
LC Duplex
Fiber Type
Single-mode
Tx Power
-7 ~ 2.3 dBm
Rx Sensitivity
≤ -13.7 dBm
Power Supply
3.3V
Operating Temp
0°C to +70°C
DOM Support
Yes
Compliance
IEEE 802.3ba, QSFP+ MSA, RoHS


❓ FAQ

Q1: What fiber is required for QSFP-40G-LR4-S=?

Single-mode fiber (OS2) with LC connectors.


Q2: What is the maximum transmission distance?

Up to 10 kilometers.


Q3: Can it be used inside a data center?

It is typically used for inter-building or inter-data center connections.


Q4: What is the difference between LR4 and ER4?

LR4 supports 10km, while ER4 supports up to 40km.


📈

Cisco QSFP-40G-LR4-S, QSFP-40G-LR4-S=, Cisco 40G LR4 module, 40GBASE-LR4 transceiver, 40G single mode QSFP+, Cisco long distance optical module, data center interconnect 40G


🚀 Get a Quote for Your 40G Long-Distance Project

👉 Planning a DCI or backbone deployment?
  • ✔ Stable supply
  • ✔ Fast delivery
  • ✔ Project-level support
Contact us now for pricing and availability.