The specs say 0°C to 70°C. Do you make an industrial wide-temperature version for our outdoor telecom cabinets?

This specific LQ-CW40-FR4C is our commercial-grade module designed for indoor data centers. For harsh outdoor environments like base station backhauls, we highly recommend our industrial-grade variants which support extreme temperatures from -40°C to 85°C. Please contact our support team to spec out the right wide-temp 2km option for your setup.

We are looking to bulk deploy these across our new UK datacenter. Do you guys offer any B2B pricing discounts for orders over 100 units?

Yes, we provide tiered wholesale discounts. For orders exceeding 100 units, the price drops significantly, and any order over $600 includes free global shipping. Feel free to contact our sales team directly for a custom quote!

Can you confirm if this optic strictly complies with IEEE 802.3ba 40GBASE-FR4 standards? We need it for a government compliance project.

Yes, it is 100% compliant with IEEE 802.3ba 40GBASE-FR4, RoHS, and MSA standards. Built with premium DFB lasers and PIN receivers, it easily meets the rigorous regulatory and performance requirements for both government and enterprise telecom networks.

What kind of fiber patch cords do I need for this? Should I use MPO or standard LC?

This 40Gbps module features a standard Duplex LC interface. You will need standard Single Mode Fiber (SMF) patch cables, not MPO. It is designed for simple, plug-and-play integration into existing duplex LC fiber panels up to a 2km transmission distance.

Hello, will this 40G QSFP+ transceiver play nice if we mix Cisco Nexus and Arista switches in the same rack?

Absolutely! The LQ-CW40-FR4C is fully MSA compliant and undergoes strict multi-brand switch testing. It interoperates seamlessly with Cisco, Arista, Juniper, and other major OEM equipment without triggering vendor lock-in errors.

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D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

Name: D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 220091
Price: 213.28 USD
Availability: InStock
Rating: 5 (27 reviews)

# 220091

Product: D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
SKU: 220091
P/N: LQ-CW40-FR4C
Price: $ 248
Stock: 1280 in Stock
Sold: 5.7K
Product URL: https://www.l-p.com/products/493425.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

27 Reviews

5 Questions

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5.7K Sold

$ 248

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$ 235.6

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Manufacture: LINK-PP

P/N: LQ-CW40-FR4C

Compatible:: Cisco; LINK-PP; Allied Telesis; Arista; Avago; Avaya; Brocade; Check Point; Chelsio; Ciena; D-Link; EdgeCore; F5 Networks; Fortinet; Generic; H3C; HPE Aruba; HPE H3C; HW; Intel; Juniper; MRV; Mikrotik; NVIDIA/Mellanox; Palo Alto

Compatible P/N:: DEM-QX02Q-IR4 | 2km; DEM-QX10Q-LR4 | 10km; DEM-QX40Q-ER4 | 40km

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D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ Specifications

The D-Link DEM-QX02Q-IR4 Compatible LINK-PP module is a high-performance 40G QSFP+ transceiver designed for efficient optical communication. Built for single-mode fiber applications, this commercial-grade module perfectly complies with the IEEE 802.3ba 40GBASE-FR4 standard. It features a hot-pluggable form factor and operates reliably within a standard temperature range, ensuring stable enterprise networking connectivity.

D-Link Part Number	DEM-QX02Q-IR4	Vendor Name	LINK-PP
Form Factor	QSFP+	Max Data Rate	40Gbps
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	Max Cable Distance	2km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
Operating Temperature Range	0°C to +70°C	Protocols	40G Ethernet, Fibre Channel, SATA/SAS3, MSA Compliant
Host FEC	Supported	DOM/DDM	Supported

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Q: The specs say 0°C to 70°C. Do you make an industrial wide-temperature version for our outdoor telecom cabinets? By L***t on 2026-06-14

A: This specific LQ-CW40-FR4C is our commercial-grade module designed for indoor data centers. For harsh outdoor environments like base station backhauls, we highly recommend our industrial-grade variants which support extreme temperatures from -40°C to 85°C. Please contact our support team to spec out the right wide-temp 2km option for your setup. By admin on 2026-06-14
Q: We are looking to bulk deploy these across our new UK datacenter. Do you guys offer any B2B pricing discounts for orders over 100 units? By M***e on 2025-08-23

A: Yes, we provide tiered wholesale discounts. For orders exceeding 100 units, the price drops significantly, and any order over $600 includes free global shipping. Feel free to contact our sales team directly for a custom quote! By admin on 2025-08-23
Q: Can you confirm if this optic strictly complies with IEEE 802.3ba 40GBASE-FR4 standards? We need it for a government compliance project. By D***z on 2025-07-07

A: Yes, it is 100% compliant with IEEE 802.3ba 40GBASE-FR4, RoHS, and MSA standards. Built with premium DFB lasers and PIN receivers, it easily meets the rigorous regulatory and performance requirements for both government and enterprise telecom networks. By admin on 2025-07-07
Q: What kind of fiber patch cords do I need for this? Should I use MPO or standard LC? By R***n on 2025-04-12

A: This 40Gbps module features a standard Duplex LC interface. You will need standard Single Mode Fiber (SMF) patch cables, not MPO. It is designed for simple, plug-and-play integration into existing duplex LC fiber panels up to a 2km transmission distance. By admin on 2025-04-12
Q: Hello, will this 40G QSFP+ transceiver play nice if we mix Cisco Nexus and Arista switches in the same rack? By D***r on 2024-12-16

A: Absolutely! The LQ-CW40-FR4C is fully MSA compliant and undergoes strict multi-brand switch testing. It interoperates seamlessly with Cisco, Arista, Juniper, and other major OEM equipment without triggering vendor lock-in errors. By admin on 2024-12-16

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M***s

Peru

Verified Purchase

5 .0

2026-05-09

Reliable 2km SMF transceiver, top notch.

131 Helpful vote Comments

W***r

Colombia

Verified Purchase

5 .0

2026-05-04

Tested this 40GBASE-FR4 optic on a Juniper switch for base station backhaul. MUX/DEMUX handles the 1271-1331nm wavelengths brilliantly. Under 3.5W power draw keeps the rack cool.

42 Helpful vote Comments

A***l

Hong Kong

Verified Purchase

5 .0

2026-03-22

Cheaper than OEM Arista optics but identical 2km fiber transmission. Highly recommend!

145 Helpful vote Comments

C***z

New Zealand

Verified Purchase

5 .0

2026-02-20

Awesome 40Gbps optical module for campus networking.

222 Helpful vote Comments

S***s

Czech Republic

Verified Purchase

5 .0

2025-10-31

Best affordable 40G CWDM4 module for home 10G NAS upgrades. Plugged into my EdgeCore gear seamlessly. Latency is non-existent on single mode fiber. Will definitely buy more!

125 Helpful vote Comments

R***s

Poland

Verified Purchase

5 .0

2025-09-11

Excellent LINK-PP CWDM4 module. TX/RX levels remain stable even at 60°C operating temp.

89 Helpful vote Comments

J***n

Norway

Verified Purchase

4 .0

2025-06-23

Fast 2km SMF optical module, but tracking updated late. Still recommend for US buyers!

79 Helpful vote Comments

R***s

Colombia

Verified Purchase

5 .0

2025-05-24

Replaced old DACs with this 2km duplex LC optic. Much cleaner outdoor cabinet setup!

29 Helpful vote Comments

D***r

Chile

Verified Purchase

5 .0

2025-05-10

Bulk deployed these 40GBASE-FR4 in our UK data center. Incredible ROI and reliable performance.

76 Helpful vote Comments

M***e

Brazil

Verified Purchase

5 .0

2025-04-22

Bought a batch of 40G QSFP+ transceivers for our datacenter interconnect. Stable 2km transmission over duplex LC SMF. Working perfectly at 45°C indoors. Zero drops so far.

228 Helpful vote Comments

S***r

Spain

Verified Purchase

5 .0

2025-04-17

Cheap 40G QSFP+ that actually works well.

46 Helpful vote Comments

R***n

Portugal

Verified Purchase

5 .0

2025-03-26

Used for a multi-brand switch test. No compatibility issues with this QSFP+ module.

169 Helpful vote Comments

K***l

Spain

Verified Purchase

5 .0

2025-03-20

Solid Cisco compatible 40G QSFP+ for our server room. Plug and play, folks!

36 Helpful vote Comments

S***a

France

Verified Purchase

5 .0

2024-12-29

Simple, easy to use and store in my kit.

39 Helpful vote Comments

H***n

Belarus

Verified Purchase

5 .0

2024-12-10

Every thing went smooth. I had a question and called, they helped me right away.

39 Helpful vote Comments

K***s

Belarus

Verified Purchase

5 .0

2024-11-17

It was great. I'm very happy with my purchase.

108 Helpful vote Comments

D***U

Hungary

Verified Purchase

5 .0

2024-11-07

I WAS VERY IMPRESSED WITH YOUR EXCELLENT SERVICE. THANK YOU.

57 Helpful vote Comments

B***v

Russian Federation

Verified Purchase

5 .0

2024-07-17

They get your equipment shipped to you quickly. Their prices are good and the products are quality.

96 Helpful vote Comments

T***f

Japan

Verified Purchase

5 .0

2024-07-16

good place to shop great variety of products

37 Helpful vote Comments

I***f

Singapore

Verified Purchase

5 .0

2024-07-06

Have shopped with Link-pp for years. Good prices, great service and quick ship.

24 Helpful vote Comments

E***l

United Arab Emirates

Verified Purchase

5 .0

2024-02-16

LINK-PP is a good choice. Their products are always with high quality and low price.

49 Helpful vote Comments

a***d

United States

Verified Purchase

5 .0

2024-02-10

easy navigation, wide selcetion, smooth communication, but longer delivery than expectation.

48 Helpful vote Comments

J***w

Italy

Verified Purchase

5 .0

2023-10-19

Wish there was a free shipping option for smaller purchases.

31 Helpful vote Comments

E***l

Bangladesh

Verified Purchase

5 .0

2023-09-29

Great service,great prices,Fast shipping, I will be buying a lot of things from them thanks

28 Helpful vote Comments

Y***i

Germany

Verified Purchase

5 .0

2023-06-14

Your web site is easy to understand and get around

53 Helpful vote Comments

A***f

Turkey

Verified Purchase

5 .0

2023-05-21

The product page was very easy to read, very well detailed, and professional in appearance.

29 Helpful vote Comments

D***g

United States

Verified Purchase

5 .0

2023-04-14

Everything went very smoothly. What impressed me most is the great customer servive.

20 Helpful vote Comments

Verified Purchase

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D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

Product Details

D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ Specifications

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Key Features of D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+

D-Link DEM-QX02Q-IR4 Compatible LINK-PP 40G QSFP+ Optical Module

DEM-QX02Q-IR4: 40G Connectivity for Campus Network

DEM-QX02Q-IR4 Module with CWDM4 Technology for Fiber Efficiency

DEM-QX02Q-IR4 Module with 1271nm, 1291nm, 1311nm, 1331nm Wavelength

DEM-QX02Q-IR4 Module Supporting 2km Transmission

DEM-QX02Q-IR4 Module with Duplex LC Interface

DEM-QX02Q-IR4 Module with DOM for Real-Time Monitoring

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