Welcome to QSFPTEK Global     Free shipping on orders over US$ 79.8     US and Poland Local warehouse

United States - Enlish / $USD
United States -   Enlish / $USD
  • Australia - Enlish / $USD
  • Canada - Enlish / $USD
  • India - Enlish / $USD
  • Malaysia - Enlish / $USD
  • New Zealand - Enlish / $USD
  • Pakistan - Enlish / $USD
  • Philippines - Enlish / $USD
  • Republic of Malta - Enlish / $USD
  • Republic of Ireland - Enlish / $USD
  • Singapore - Enlish / $USD
  • United Kingdom - Enlish / $USD
  • United States - Enlish / $USD


Free shipping on orders over US$ 79.8
United States


Add to Cart

Arista QSFP-LR4-40G-20 Compatible 40GBASE-LR4 QSFP+ 1310nm 20km DDM LC SMF Optical Transceiver Module

Product No :100025
US$ 83.90  US$ 279.00
5288 in real-time stock, 18Jul, 2024

Free Shipping over US$ 79.8

US/EU Warehouses in stock

14-day Return and Refund

1. < 3.5W Low Power Consumption.
2. Link Up to 20 km via Singlemode OS2.
2. LC Duplex Connector, DFP+PIN.
3. Fully Compatible with 100+ Vendors.
4. For Data Center and 40G Ethernet Applications.
5. Hot Pluggable QSFP+ MSA Compliant.
See more


Arista QSFP-LR4-40G-20 Compatible 40GBASE-LR4 QSFP+ Optical Transceiver Module (SMF, 1310nm, 20km, LC, DDM)


The Arista QSFP-LR4-40G-20 compatible 40G QSFP+ LR4 transceiver module is equipped with LC duplex connectors, reaching a link up to 20km over OS2 single-mode fiber (SMF). This 40G optical transceiver comes with a bidirectional 4-channel QSFP+ connector, enabling a total of 40 Gbps bandwidth by each channel carrying a 10 Gbps data rate. DOM/DDM (digital diagnostics monitoring) function is supported on the QSFP 40G fiber optic transceiver to achieve real-time operating parameters monitoring.


QSFPTEK manufactured 40GBASE-LR4 QSFP+ module is compliant with QSFP+ MSA and 40GBASE-LR4 specifications. Besides, the QSFP LR4 optic has been tested on host devices to ensure full compatibility with Arista equipment, such as data center switches, enterprise routers, and server network interface cards (NICs). The third-party 40G SFP module is an ideal substitute to the QSFP-40GE-LR4 QSFP+ 40G transceiver at an affordable price, providing a cost-effective compatible solution for high-performance 40G connectivity.


LR4 40G QSFP optics cater to 40 Gigabit Ethernet (40GbE) optical fiber connections, ideal for high-performance and long-distance applications in the data center, enterprise core and distribution layers, campus networks, metro networks, etc.


Model Name QSFP-LR4-40G-20 Vendor Name QSFPTEK
Form Factor QSFP+ Data Rate 40 Gbps
Wavelength 1310nm Distance 20km@OS2
Connector LC Duplex Cable Type OS2 SMF
Transmitter Type DFB Receiver Type PIN
TX Power -4~2.3dBm Receiver Sensitivity <-11.5dBm
Power Consumption <3.5W Modulation Format NRZ
DDM Support Bit Error Ratio (BER) 1E-12
Protocols QSFP+ MSA, SFF-8436, 40G Ethernet Warranty 5 Years
Quality Testing Program
Quality Certifications


  • 1. High Reliablility and Best Price
    Proudly self-producing and rigorous testing, QSFPTEK is dedicated to delivering cost-effective products with high reliability and performance at a trade price.
  • 2. Wide Application Scenarios
    Fully compatible with almost all Arista devices. Ideal for data center, campus network, metro network, etc.
  • 3. Protocols
    Compliant with QSFP+ MSA, SFF-8436, 40G Ethernet.
  • 4. Quality Certifications
    Backed by CE, FCC, ROSH, ISO9001.

Product details

Various Switch Tests


Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.


transceiver compatibility tests



Tested in The Host Device to Prove Interoperability


Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.




Various Switch Tests


Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.




40G QSFP+ Model Contrast Table


Part Number
















LWDM 1294~1310nm

Max Distance