Quick sanity check: do I need an MPO/MTP trunk for these, or will my standard LC patch cables work?

You’re good to go with your standard LC cables! This transceiver uses a standard Duplex LC interface over Single Mode Fiber (SMF). It multiplexes the 4 wavelengths internally, completely eliminating the need for expensive 8/12-core MPO cabling.

This one says 0°C to 70°C, but some of our edge switches are in un-airconditioned outdoor enclosures. Do you guys make a rugged version?

For extreme outdoor edge nodes, we highly recommend our industrial-grade line. While this LQ-CW40-L24C is perfect for standard indoor setups, you should check out our LQ-CW40-L24I models specifically engineered for harsh -40°C to 85°C environments!

Need to ensure this passes our compliance checks. Is it fully IEEE 802.3ba compliant for enterprise network routing?

Yes! It strictly adheres to IEEE 802.3ba 40GBASE-LR4 and QSFP+ MSA standard protocols, supports Host FEC, and passes all global telecom compliance testing for safe, reliable data center interconnects.

Hey, just verifying if this 40G QSFP+ module will play nice in a mixed rack with both Cisco Nexus and Arista switches?

there! Yes, absolutely. It's fully SFF-8436 MSA compliant and tested rigorously for cross-compatibility with Cisco, Arista, Juniper, and other major OEMs. You won't run into any vendor lock-in or interoperability issues.

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DELL QSFP-ELR4-40G Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module

Name: DELL QSFP-ELR4-40G Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 219540
Price: 235.64 USD
Availability: InStock
Rating: 4.9 (38 reviews)

# 219540

Product: DELL QSFP-ELR4-40G Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module
SKU: 219540
P/N: LQ-CW40-L24C
Price: $ 274
Stock: 621 in Stock
Sold: 2.8K
Product URL: https://www.l-p.com/products/482459.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

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Manufacture: LINK-PP

P/N: LQ-CW40-L24C

Compatible:: Cisco; LINK-PP; Arista; Brocade; DELL; Extreme; Generic; H3C; HW; Intel; Juniper; NVIDIA/Mellanox

Compatible P/N:: 430-4917 | 10km; GP-QSFP-40GE-1LR | 10km; QSFP-40G-LR4 | 10km; QSFP-LR4-40G-I | 10km; QSFP-ELR4-40G | 20km; 430-4917-40 | 40km

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DELL QSFP-ELR4-40G Compatible LINK-PP 40G QSFP+ Specifications

The DELL QSFP-ELR4-40G Compatible LINK-PP module is a high-performance 40G QSFP+ transceiver designed for long-reach networking. Compliant with IEEE 802.3ba 40GBASE-LR4 and SFF-8436 standards, this single mode optical module ensures superior data transmission. It features a robust hot-pluggable design, supporting an impressive 40Gbps data rate to meet the demanding specifications of modern data center interconnects.

DELL Part Number	QSFP-ELR4-40G	Vendor Name	LINK-PP
Form Factor	QSFP+	Max Data Rate	40Gbps
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
Operating Temperature Range	0°C to +70°C	Protocols	QSFP+ MSA, SFF-8436
Host FEC	Supported	Power Supply	+3.3V

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Q: Quick sanity check: do I need an MPO/MTP trunk for these, or will my standard LC patch cables work? By K***s on 2026-03-17

A: You’re good to go with your standard LC cables! This transceiver uses a standard Duplex LC interface over Single Mode Fiber (SMF). It multiplexes the 4 wavelengths internally, completely eliminating the need for expensive 8/12-core MPO cabling. By admin on 2026-03-17
Q: This one says 0°C to 70°C, but some of our edge switches are in un-airconditioned outdoor enclosures. Do you guys make a rugged version? By S***n on 2026-02-20

A: For extreme outdoor edge nodes, we highly recommend our industrial-grade line. While this LQ-CW40-L24C is perfect for standard indoor setups, you should check out our LQ-CW40-L24I models specifically engineered for harsh -40°C to 85°C environments! By admin on 2026-02-20
Q: Need to ensure this passes our compliance checks. Is it fully IEEE 802.3ba compliant for enterprise network routing? By L***s on 2026-02-17

A: Yes! It strictly adheres to IEEE 802.3ba 40GBASE-LR4 and QSFP+ MSA standard protocols, supports Host FEC, and passes all global telecom compliance testing for safe, reliable data center interconnects. By admin on 2026-02-17
Q: Hey, just verifying if this 40G QSFP+ module will play nice in a mixed rack with both Cisco Nexus and Arista switches? By A***e on 2025-10-21

A: Hey there! Yes, absolutely. It's fully SFF-8436 MSA compliant and tested rigorously for cross-compatibility with Cisco, Arista, Juniper, and other major OEMs. You won't run into any vendor lock-in or interoperability issues. By admin on 2025-10-21

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J***r

Ukraine

Verified Purchase

5 .0

2026-06-05

Highly recommend this data center QSFP+ unit!

72 Helpful vote Comments

J***s

Tunisia

Verified Purchase

4 .0

2026-04-04

Shipping took an extra day. Cisco compatible 40G paired up fine though.

37 Helpful vote Comments

D***n

Ireland

Verified Purchase

5 .0

2026-02-24

The CWDM4 technology really saved our single mode fiber cabling costs. Excellent value!

133 Helpful vote Comments

P***n

Switzerland

Verified Purchase

5 .0

2025-11-26

We strictly monitor DOM metrics, and this 40G QSFP+ transceiver maintains pristine 1331nm Rx levels over a 12km campus fiber ring. Excellent SFF-8436 compliance and zero OEM lock-in issues with our mixed Brocade/Extreme environment.

183 Helpful vote Comments

R***h

Singapore

Verified Purchase

5 .0

2025-11-05

Tested 1311nm wavelength, DOM looks super stable.

69 Helpful vote Comments

C***n

Argentina

Verified Purchase

5 .0

2025-08-08

Duplex LC interface snapped right in. Awesome 20km SMF module for base station backhaul.

50 Helpful vote Comments

D***l

Portugal

Verified Purchase

5 .0

2025-08-03

Tested the CWDM multiplexing on these duplex LC optics across our core routers. Flawless 40Gbps Infiniband throughput and the laser handles standard 0°C to +70°C temps beautifully inside our dense, un-airconditioned edge node cabinet.

176 Helpful vote Comments

A***s

Dominican Republic

Verified Purchase

5 .0

2025-07-11

Great commercial temp optical module, cheap too.

62 Helpful vote Comments

D***n

Belgium

Verified Purchase

4 .0

2025-07-06

Box arrived a bit squashed, but the 40G QSFP+ module works flawlessly.

213 Helpful vote Comments

C***e

Panama

Verified Purchase

5 .0

2025-06-21

Flawless 40Gbps data rate on duplex LC.

171 Helpful vote Comments

R***n

Norway

Verified Purchase

5 .0

2025-06-17

Deployed 50 of these 40GBASE-LR4 units. Mellanox compatibility is 100% on point.

163 Helpful vote Comments

D***e

Germany

Verified Purchase

5 .0

2025-06-17

Perfect 20km SMF module for our campus!

162 Helpful vote Comments

M***z

Italy

Verified Purchase

5 .0

2025-05-31

Replaced some pricey OEM units with this 20km SMF module. DDM data shows stable 3.3V draw under load. Perfect for our bulk data center QSFP+ deployment, saving thousands on TCO without sacrificing reliability.

88 Helpful vote Comments

R***k

Switzerland

Verified Purchase

5 .0

2025-05-26

Arista switches accepted these instantly. Zero drops.

181 Helpful vote Comments

T***o

Russian Federation

Verified Purchase

5 .0

2025-02-21

Very nice sales to speak to and knowledgeable on the products they sell!

36 Helpful vote Comments

A***s

United Kingdom

Verified Purchase

5 .0

2025-01-15

DDM stats on these 1310nm 20km modules are accurate. Great for our 10G NAS.

114 Helpful vote Comments

V***e

Indonesia

Verified Purchase

5 .0

2024-12-28

I am proud to e a customer of Fiberstore.

81 Helpful vote Comments

S***z

Ethiopia

Verified Purchase

5 .0

2024-12-10

Our team required a reliable Cisco compatible 40G link for an 18km base station backhaul. This 1310nm optical transceiver delivered ultra-low latency instantly. Truly a robust solution for large-scale enterprise routing and switching.

192 Helpful vote Comments

L***n

United States

Verified Purchase

5 .0

2024-11-30

Smooth Infiniband QDR connectivity. Running these in a Juniper chassis without a hitch.

69 Helpful vote Comments

Y***p

Denmark

Verified Purchase

5 .0

2024-11-30

Great site and great company to do business with. Website is easy to navigate and reviews always very helpful with purchases.

22 Helpful vote Comments

D***n

Italy

Verified Purchase

5 .0

2024-11-17

Temperatures stay well within 0-70°C. Perfect commercial grade optical module for our racks. ❄️

146 Helpful vote Comments

R***n

Indonesia

Verified Purchase

5 .0

2024-11-02

CWDM4 LC setup was plug and play! ⚡

185 Helpful vote Comments

R***h

Thailand

Verified Purchase

5 .0

2024-07-31

A wonderful experience! Never buying anywhere else!

34 Helpful vote Comments

G***i

United States

Verified Purchase

5 .0

2024-07-10

Detected right away and no issues. Price is great

70 Helpful vote Comments

H***r

Hong Kong

Verified Purchase

5 .0

2024-06-08

I got exactly what I wanted and received them in a very timely manner. Satisfied

53 Helpful vote Comments

A***i

Morocco

Verified Purchase

5 .0

2024-05-22

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

41 Helpful vote Comments

H***n

Russian Federation

Verified Purchase

5 .0

2024-04-09

We had a large volume for 10/25/40G Transceiver Modules each month.always had good performance. This time our Account Manager told me that it had a big price reduction, so we purchased some more which can be used for six months. Surprisingly, we received the goods quickly. That's great.

85 Helpful vote Comments

B***r

United States

Verified Purchase

5 .0

2024-03-17

Nice, but to our suprise, this cheap magnetics has 3 layer of packaging. But it is good for us.

24 Helpful vote Comments

J***k

Canada

Verified Purchase

5 .0