Hello, looking to use these 40G QSFP+ modules in a mixed environment with Cisco Nexus and Juniper QFX switches. Will DOM and MPO connections work seamlessly across both?

Absolutely! The LQ-M8540-SR4C is extensively tested for multi-vendor interoperability and works perfectly with major brands like Cisco, Juniper, and Arista. MPO-12 connectivity and live DOM/DDM metrics will function smoothly across your mixed-switch deployment without any proprietary lock-ins.

We're planning a massive data center upgrade and need about 500 of these 40GBASE-SR4 transceivers. Do you offer B2B bulk discounts or net terms?

Yes, we do! For high-volume enterprise procurement, we offer significant tiered bulk discounts and flexible net terms to support your capital expenditure plans. Please reach out to our B2B sales team directly to get a custom quote for your 500-unit rollout.

Do these QSFP+ 40G transceivers meet standard industry compliance? We need RoHS and MSA certification for our corporate compliance policies.

Yes, strictly compliant. The LQ-M8540-SR4C adheres to the SFF-8436 MSA standard, IEEE 802.3ba, and is fully RoHS certified. They meet all stringent global data center networking and safety standards, ensuring zero compliance friction for corporate enterprise deployments.

Can I use this 850nm transceiver with older OM2 fiber, or does it strictly require OM3/OM4 MPO cables to hit that 300m transmission distance?

To achieve the reliable 40Gbps speed and reach the maximum transmission distance (150m on OM3, 300m on OM4), you must use OM3 or OM4 multimode fiber with an MPO-12 connector. Legacy OM2 cables simply lack the bandwidth capacity required for 40G transmission over practical distances.

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Cisco QSFP-40G-SR4 Compatible LINK-PP 40G QSFP+ SR4 850nm 300m MPO-12 DOM MMF Optical Transceiver Module

Name: Cisco QSFP-40G-SR4 Compatible LINK-PP 40G QSFP+ SR4 850nm 300m MPO-12 DOM MMF Optical Transceiver Module
Brand: LINK-PP
SKU: 221850
Price: 30.96 USD
Availability: InStock
Rating: 5 (20 reviews)

# 221850

Product: Cisco QSFP-40G-SR4 Compatible LINK-PP 40G QSFP+ SR4 850nm 300m MPO-12 DOM MMF Optical Transceiver Module
SKU: 221850
P/N: LQ-M8540-SR4C
Price: $ 36
Stock: 336 in Stock
Sold: 2.1K
Product URL: https://www.l-p.com/products/496955.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

: Cisco QSFP-40G-SR4 Compatible LINK-PP 40G QSFP+ SR4 850nm 300m MPO-12 DOM MMF Optical Transceiver Module

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Manufacture: LINK-PP

P/N: LQ-M8540-SR4C

Compatible:: Cisco; LINK-PP; APRESIA; Alcatel-Lucent; Allied Telesis; Arista; Avago; Avaya; BladeSystem; Brocade; Check Point; Chelsio; Ciena; Cisco Meraki; D-Link; DELL; EdgeCore; Extreme; F5 Networks; FS; Fortinet; Gigamon; H3C; HPE Aruba; HPE H3C; HW; IBM; Intel; Ixia; Juniper; MRV; MikroTik; NVIDIA/Mellanox; Palo Alto; Quanta; ZTE

Compatible P/N:: QSFP-40G-SR4 | 300m; QSFP-40G-SR4-S | 300m; QSFP-SR4-40G-I | 300m; QSFP-4X10G-LR-S | 10km

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Cisco QSFP-40G-SR4 Compatible LINK-PP 40G QSFP+ Specifications

The Cisco QSFP-40G-SR4 Compatible LINK-PP module is a premium 40G QSFP+ optical transceiver engineered for high-speed network connections. Operating at an 850nm wavelength, this high-performance module supports data center infrastructure with robust 40Gbps connectivity over multimode fiber. It integrates an MPO connector and advanced DOM capabilities, ensuring seamless commercial-grade performance and exceptional reliability.

Cisco Part Number	QSFP-40G-SR4	Vendor Name	LINK-PP
Form Factor	QSFP+	Max Data Rate	40Gbps
Wavelength	850nm	Max Cable Distance	300m
Connector	MPO-12	Media	MMF
Transmitter Type	VCSEL	Receiver Type	PIN
Protocols	IEEE 802.3 40GBASE-SR4, SFF-8436	Operating Temperature Range	0°C to +70°C

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Q: Hello, looking to use these 40G QSFP+ modules in a mixed environment with Cisco Nexus and Juniper QFX switches. Will DOM and MPO connections work seamlessly across both? By K***l on 2026-04-16

A: Absolutely! The LQ-M8540-SR4C is extensively tested for multi-vendor interoperability and works perfectly with major brands like Cisco, Juniper, and Arista. MPO-12 connectivity and live DOM/DDM metrics will function smoothly across your mixed-switch deployment without any proprietary lock-ins. By admin on 2026-04-17
Q: We're planning a massive data center upgrade and need about 500 of these 40GBASE-SR4 transceivers. Do you offer B2B bulk discounts or net terms? By J***z on 2026-03-03

A: Yes, we do! For high-volume enterprise procurement, we offer significant tiered bulk discounts and flexible net terms to support your capital expenditure plans. Please reach out to our B2B sales team directly to get a custom quote for your 500-unit rollout. By admin on 2026-03-04
Q: Do these QSFP+ 40G transceivers meet standard industry compliance? We need RoHS and MSA certification for our corporate compliance policies. By P***r on 2025-11-22

A: Yes, strictly compliant. The LQ-M8540-SR4C adheres to the SFF-8436 MSA standard, IEEE 802.3ba, and is fully RoHS certified. They meet all stringent global data center networking and safety standards, ensuring zero compliance friction for corporate enterprise deployments. By admin on 2025-11-22
Q: Can I use this 850nm transceiver with older OM2 fiber, or does it strictly require OM3/OM4 MPO cables to hit that 300m transmission distance? By D***s on 2025-10-29

A: To achieve the reliable 40Gbps speed and reach the maximum transmission distance (150m on OM3, 300m on OM4), you must use OM3 or OM4 multimode fiber with an MPO-12 connector. Legacy OM2 cables simply lack the bandwidth capacity required for 40G transmission over practical distances. By admin on 2025-10-29

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P***n

Venezuela

Verified Purchase

5 .0

2026-05-26

OEM compatible 40G transceivers that actually work.

162 Helpful vote Comments

D***e

Spain

Verified Purchase

5 .0

2026-05-17

Plug and play QSFP+ with my Juniper gear.

175 Helpful vote Comments

C***s

Ukraine

Verified Purchase

5 .0

2026-04-22

Deployed 50 MPO-12 40GBASE-SR4 modules for a 40G NAS cluster. VCSEL laser power is excellent, staying well within 0-70C limits. Unbeatable Total Cost of Ownership for enterprise B2B networks.

99 Helpful vote Comments

S***z

Denmark

Verified Purchase

4 .0

2026-03-23

Box arrived a bit dented, but these 40G QSFP+ SR4 modules work flawlessly.

194 Helpful vote Comments

M***n

Colombia

Verified Purchase

5 .0

2026-01-22

Installed them in a climate-controlled outdoor cabinet. Stable 40G links and precise DDM data.

53 Helpful vote Comments

C***n

Spain

Verified Purchase

5 .0

2026-01-12

Great 300m range for our indoor server racks.

44 Helpful vote Comments

D***s

Peru

Verified Purchase

5 .0

2026-01-11

Ran an iPerf test across Dell and Cisco core switches using these 40G QSFP+ SR4 850nm transceivers. Zero CRC errors over a 250m OM4 run. DOM stats remained highly accurate!

39 Helpful vote Comments

N***r

Colombia

Verified Purchase

5 .0

2025-04-07

Excellent 850nm VCSEL performance. Seamless MPO-12 integration into our existing OM4 multimode fiber layout.

102 Helpful vote Comments

E***a

Poland

Verified Purchase

5 .0

2025-03-10

Bulk procurement was smooth. Great B2B supplier!

140 Helpful vote Comments

L***s

Republic of Korea

Verified Purchase

5 .0

2025-01-10

Excellent compatibility! I was skeptical about mixing them in a multi-brand environment, but they synced seamlessly with our HPE Aruba and Extreme networks. Perfect 40Gbps backhaul solution for campus networking.

88 Helpful vote Comments

A***s

Switzerland

Verified Purchase

5 .0

2024-12-10

Solid enterprise procurement choice. These LQ-M8540-SR4C modules handle 40Gbps bandwidth without any packet drops.

73 Helpful vote Comments

D***n

Portugal

Verified Purchase

5 .0

2024-10-17

Upgraded our data center switches with these LINK-PP 40G transceivers. DOM works perfectly!

151 Helpful vote Comments

M***s

Czech Republic

Verified Purchase

5 .0

2024-10-14

Works perfectly for our home 40G NAS setup.

196 Helpful vote Comments

M***a

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-10-12

These Optical Transceiver Modules helped me a great deal.

45 Helpful vote Comments

C***a

Hong Kong

Verified Purchase

5 .0

2024-06-26

Purchases are usually in store. Always have product in stock

47 Helpful vote Comments

J***e

Spain

Verified Purchase

5 .0

2023-11-29

The order process went well, and I think I received a good value for the item I purchased. It was delivered as scheduled.

91 Helpful vote Comments

Z***a

Brunei Darussalam

Verified Purchase

5 .0

2023-11-24

Well-designed, Fast, clear website made it extremely easy to order, which I appreciated very much. I have always had a wonderful experience at l-p.com. The professional staff here has always been able to help answer questions. Thanks guys.

57 Helpful vote Comments

E***i

Mexico

Verified Purchase

5 .0

2023-10-27

it was Fast & easy , got the help i need it .

69 Helpful vote Comments

S***n

Thailand

Verified Purchase

5 .0