We're doing a massive data center interconnect upgrade and need to grab around 150 units. Do you guys offer any B2B bulk pricing?

Definitely! We fully support enterprise volume procurement. The cart automatically applies discounts for large orders, but for deployments of 100+ units, please hit up our B2B sales team directly for deeper net terms and customized quotes.

Hello, will this 400G QSFP-DD optic work with our Cisco Nexus 9000 core switches? I really don't want to deal with "unsupported transceiver" errors.

Yes, absolutely. The LQD-CW400-LR4C is fully QSFP-DD MSA compliant with custom EEPROM coding available. It functions plug-and-play in Cisco Nexus environments natively without triggering any third-party block alerts.

Are these optics strictly for Ethernet, or do they support industry protocols like InfiniBand? We need them for an AI HPC cluster setup.

They seamlessly handle both! They are fully compliant with IEEE 802.3bs for Ethernet and strictly adaptable to 400G InfiniBand NDR protocol standards. They deliver the massive bandwidth and ultra-low latency required for heavy AI nodes and server backend networks.

Just double-checking the fiber type—do I need an MPO trunk for this, or will my standard duplex LC single-mode patches work for a 10km link?

Your standard Duplex LC OS2 single-mode fiber (SMF) patch cables will work perfectly! This transceiver uses built-in CWDM technology to multiplex four wavelengths, running 400G over just two strands of fiber up to 10km. No MPO conversion required!

Breadcrumb: Home; Products; Optics Transceivers | SFP Modules; 200/400/800G Transceiver Modules; 400G QSFP-DD/OSFP/QSFP112; 214800

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Cisco QDD-400G-LR4-S Compatible LINK-PP 400G QSFP-DD 1310nm 10km Duplex LC DOM SMF Optical Transceiver Module

Name: Cisco QDD-400G-LR4-S Compatible LINK-PP 400G QSFP-DD 1310nm 10km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 214800
Price: 738.74 USD
Availability: InStock
Rating: 5 (24 reviews)

# 214800

Product: Cisco QDD-400G-LR4-S Compatible LINK-PP 400G QSFP-DD 1310nm 10km Duplex LC DOM SMF Optical Transceiver Module
SKU: 214800
P/N: LQD-CW400-LR4C
Price: $ 859
Stock: 789 in Stock
Sold: 897
Product URL: https://www.l-p.com/products/472202.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

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: Cisco QDD-400G-LR4-S Compatible LINK-PP 400G QSFP-DD 1310nm 10km Duplex LC DOM SMF Optical Transceiver Module

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Manufacture: LINK-PP

P/N: LQD-CW400-LR4C

Compatible:: Cisco; LINK-PP; Arista; Ciena; Dell; Extreme; FS; Generic; H3C; HPE Aruba; Juniper; NVIDIA/Mellanox

Compatible P/N:: QDD-400G-FR4-S | 2km; QSFP112-FR4-400G | 2km; QDD-400G-LR4-S | 10km

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Cisco QDD-400G-LR4-S Compatible LINK-PP 400G QSFP-DD Specifications

The Cisco QDD-400G-LR4-S Compatible LINK-PP module is a high-performance 400G QSFP-DD optical transceiver engineered for demanding data communication environments. It translates eight channels of 53.125Gb/s electrical input into four lanes of 106.25Gb/s optical signals. Compliant with IEEE 802.3bs and QSFP-DD MSA standards, this hot-pluggable module features a single 3.3V power supply and low power consumption.

Cisco Part Number	QDD-400G-LR4-S	Vendor Name	LINK-PP
Max Data Rate	425Gbps	Form Factor	QSFP-DD
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	Max Cable Distance	10km
Connector	Duplex LC	Media	SMF
Transmitter Type	CWDM EML	Receiver Type	PIN
Max Power Consumption	9.5W	Protocols	IEEE 802.3bs, QSFP-DD MSA
DDM/DOM	Supported	Operating Temperature Range	0°C to +70°C

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Q: We're doing a massive data center interconnect upgrade and need to grab around 150 units. Do you guys offer any B2B bulk pricing? By D***s on 2026-03-13

A: Definitely! We fully support enterprise volume procurement. The cart automatically applies discounts for large orders, but for deployments of 100+ units, please hit up our B2B sales team directly for deeper net terms and customized quotes. By admin on 2026-03-13
Q: Hello, will this 400G QSFP-DD optic work with our Cisco Nexus 9000 core switches? I really don't want to deal with "unsupported transceiver" errors. By K***n on 2025-11-29

A: Hi! Yes, absolutely. The LQD-CW400-LR4C is fully QSFP-DD MSA compliant with custom EEPROM coding available. It functions plug-and-play in Cisco Nexus environments natively without triggering any third-party block alerts. By admin on 2025-11-29
Q: Are these optics strictly for Ethernet, or do they support industry protocols like InfiniBand? We need them for an AI HPC cluster setup. By L***r on 2025-08-25

A: They seamlessly handle both! They are fully compliant with IEEE 802.3bs for Ethernet and strictly adaptable to 400G InfiniBand NDR protocol standards. They deliver the massive bandwidth and ultra-low latency required for heavy AI nodes and server backend networks. By admin on 2025-08-25
Q: Just double-checking the fiber type—do I need an MPO trunk for this, or will my standard duplex LC single-mode patches work for a 10km link? By E***l on 2025-03-25

A: Your standard Duplex LC OS2 single-mode fiber (SMF) patch cables will work perfectly! This transceiver uses built-in CWDM technology to multiplex four wavelengths, running 400G over just two strands of fiber up to 10km. No MPO conversion required! By admin on 2025-03-25

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S***s

Egypt

Verified Purchase

5 .0

2026-04-15

Procured 50 units for a commercial data center build-out. Complete QSFP-DD MSA compliance meant no vendor lock-in headaches. Optical DOM monitoring gives my IT admin team exact TX/RX power levels. Unbeatable ROI!

148 Helpful vote Comments

M***r

Malaysia

Verified Purchase

5 .0

2026-02-27

Runs cool well within 70C operating temp. ❄️

166 Helpful vote Comments

C***s

Argentina

Verified Purchase

5 .0

2026-01-12

Passed our Juniper multi-brand compatibility tests effortlessly. CWDM wavelengths remained highly stable.

68 Helpful vote Comments

J***z

Republic of Korea

Verified Purchase

4 .0

2026-01-09

FedEx delayed my campus CWDM deployment. The LC transceivers work flawlessly anyway though.

115 Helpful vote Comments

P***l

Finland

Verified Purchase

5 .0

2025-11-18

Extensively tested the LQD-CW400-LR4C against our existing HPE Aruba and Mellanox infrastructure. The CWDM EML transmitters maintain solid 10km link integrity over SMF. Very impressive 400Gbps performance for high-frequency trading networks. ⏱️

166 Helpful vote Comments

J***z

Chile

Verified Purchase

5 .0

2025-10-23

Reliable 1310nm single mode transceivers. Fast dispatch!

57 Helpful vote Comments

K***s

Panama

Verified Purchase

5 .0

2025-09-21

We did a massive batch deployment across our campus fiber network. These 400G LR4 transceivers pulled under 9.5W power, keeping our Cisco Nexus switches surprisingly cool. Fantastic DDM management and zero FEC errors!

116 Helpful vote Comments

N***t

Colombia

Verified Purchase

5 .0

2025-08-05

Deployed a dozen for data center interconnects. PAM4 modulation handles 400Gbps beautifully.

65 Helpful vote Comments

M***e

Italy

Verified Purchase

5 .0

2025-06-14

Massive savings on enterprise B2B volume procurement. Recommend this LQD-CW400-LR4C for bulk upgrades.

177 Helpful vote Comments

M***a

Czech Republic

Verified Purchase

5 .0

2025-06-07

Excellent 400G throughput for AI compute nodes. Minimal latency and super low power consumption.

141 Helpful vote Comments

J***n

Egypt

Verified Purchase

5 .0

2025-03-15

Homelab NAS overkill, but absolutely love it!

212 Helpful vote Comments

J***r

Netherlands

Verified Purchase

5 .0

2025-03-14

Needed long range optical modules for cabinet uplinks. Within 0-70C, they perform brilliantly.

180 Helpful vote Comments

J***z

Russian Federation

Verified Purchase

5 .0

2025-03-11

Perfect Cisco compatible 400G optic. Flawless DOM!

31 Helpful vote Comments

S***n

Taiwan, Province of China

Verified Purchase

5 .0

2025-02-05

Plug and play in my Dell core.

72 Helpful vote Comments

T***n

Turkey

Verified Purchase

5 .0

2024-12-25

Using these 10km QSFP-DD optics for base station backhaul. DOM readings are perfectly accurate!

31 Helpful vote Comments

J***r

Singapore

Verified Purchase

5 .0

2023-10-11

Everyone I know who purchases from Link-pp (including me) have nothing but great things and great experiences to say about this company.

64 Helpful vote Comments

R***n

India

Verified Purchase

5 .0

2023-07-21

LINK-PP have always delivered quality products

29 Helpful vote Comments

A***r

Russian Federation

Verified Purchase

5 .0

2023-07-14

They communicate well, adjust my delivery costs when I make multiple orders and there prices are competitive.

34 Helpful vote Comments

D***y

Austria

Verified Purchase

5 .0

2023-05-30

Reliable. High-Performing. Cost-effective. What's not to like?

24 Helpful vote Comments

S***a

Macao

Verified Purchase

5 .0

2023-02-25

They have a good selection of Optical Transceiver Modules and great customer service. Highly recommend.

84 Helpful vote Comments

J***y

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2022-12-30

Found what I needed at a good price. Ordered it and received it in four days.

29 Helpful vote Comments

Ł***i

United Kingdom

Verified Purchase

5 .0

2022-10-21

I have ordered 10 of these and my experience has been perfect. I used them in a combination of Meraki and Cisco switches and they have all performed perfectly.

65 Helpful vote Comments

M***r

Spain

Verified Purchase

5 .0

2022-08-16

Glad I found the site. Good selection and price.

96 Helpful vote Comments

P***n

Indonesia

Verified Purchase

5 .0