Can this 400G-FR4 module connect directly to a 400G-DR4 transceiver on the opposite end?

No, FR4 combines 4 wavelengths over 2 duplex LC fibers, whereas DR4 uses 8 parallel fibers with MPO connectors.

We operate a dense data center rack with airflow restricted at the back — what is the maximum operating temperature allowed for this module?

The operating temperature is rated from 0°C to 70°C, so your rack cooling should keep internal airflow within that range.

We need 400G links between buildings 1.5km apart. Will this optical module cover the distance?

Yes, it supports up to 2km transmission over single-mode fiber, so your 1.5km inter-building links will work fine.

How much heat does this module generate in a fully loaded 32-port 400G switch card?

Maximum power consumption is kept strictly under 10W per module, minimizing overall thermal dissipation across high-density switch faces.

Is this 400G QSFP112 transceiver fully compliant with 100G Lambda MSA standards?

Yes, it multiplexes four 100G PAM4 optical lanes in full accordance with 100G Lambda MSA specifications.

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LINK-PP LQ-CW400-FR4C 400G QSFP112 1310nm 2km Duplex LC DDM SMF Optical Transceiver Module

Name: LINK-PP LQ-CW400-FR4C 400G QSFP112 1310nm 2km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 207190
Price: 1224.96 USD
Availability: InStock
Rating: 4.9 (28 reviews)

# 207190

Product: LINK-PP LQ-CW400-FR4C 400G QSFP112 1310nm 2km Duplex LC DDM SMF Optical Transceiver Module
SKU: 207190
P/N: LQ-CW400-FR4C
Price: $ 1,392
Stock: 360 in Stock
Sold: 540
Product URL: https://www.l-p.com/products/494484.htm

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Manufacture: LINK-PP

P/N: LQ-CW400-FR4C

Compatible:: Cisco; LINK-PP; Arista; Broadcom; FS; Generic; H3C; Juniper; NVIDIA/Mellanox

Compatible P/N:: LO-CW400-FR4C | 2km; LQ-CW400-FR4C | 2km; LQD-CW400-FR4C | 2km; LO-CW400-LR4C | 10km; LQ-CW400-LR4C | 10km; LQD-CW400-LR4C | 10km

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LINK-PP LQ-CW400-FR4C 400G QSFP112 Specifications

LQ-CW400-FR4C is an advanced 400G QSFP112 transceiver designed to operate as a 4 x 100G PAM4 optical module across CWDM wavelengths (1271nm, 1291nm, 1311nm, and 1331nm), delivering up to 2km of data transmission over single-mode fiber (SMF) under standard commercial conditions (0 to +70°C) while ensuring full compliance with the 100G Lambda MSA 400G-FR4 specification and integrating real-time digital diagnostic monitoring.

LINK-PP Part Number	LQ-CW400-FR4C	Vendor Name	LINK-PP
Form Factor	QSFP112	Max Data Rate	425Gbps (4x106.25Gbps)
Max Cable Distance	2km	Wavelength	1271nm, 1291nm, 1311nm, 1331nm
Connector	Duplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	TIA
DDM/DOM	Supported	Operating Temperature Range	0°C to +70°C
Protocols	QSFP-112 MSA, CMIS Rev 4.0, IEEE 802.3cu, OIF-CEI-112G-VSR-PAM4	Warranty	5 Years

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Q: Can this 400G-FR4 module connect directly to a 400G-DR4 transceiver on the opposite end? By J***n on 2026-04-20

A: No, FR4 combines 4 wavelengths over 2 duplex LC fibers, whereas DR4 uses 8 parallel fibers with MPO connectors. By admin on 2026-04-21
Q: We operate a dense data center rack with airflow restricted at the back — what is the maximum operating temperature allowed for this module? By M***r on 2026-02-22

A: The operating temperature is rated from 0°C to 70°C, so your rack cooling should keep internal airflow within that range. By admin on 2026-02-23
Q: We need 400G links between buildings 1.5km apart. Will this optical module cover the distance? By L***n on 2025-12-15

A: Yes, it supports up to 2km transmission over single-mode fiber, so your 1.5km inter-building links will work fine. By admin on 2025-12-16
Q: How much heat does this module generate in a fully loaded 32-port 400G switch card? By I***r on 2025-07-15

A: Maximum power consumption is kept strictly under 10W per module, minimizing overall thermal dissipation across high-density switch faces. By admin on 2025-07-16
Q: Is this 400G QSFP112 transceiver fully compliant with 100G Lambda MSA standards? By K***r on 2025-03-26

A: Yes, it multiplexes four 100G PAM4 optical lanes in full accordance with 100G Lambda MSA specifications. By admin on 2025-03-27

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R***s

Sweden

Verified Purchase

5 .0

2026-06-22

Duplex LC saves so much patch panel space vs MPO.

60 Helpful vote Comments

M***n

Romania

Verified Purchase

5 .0

2026-06-02

We needed high-throughput trunk lines between our primary storage array and compute clusters across two facility floors. This QSFP112 400G FR4 transceiver delivers stable 400Gbps aggregate throughput utilizing single-mode fiber patch cables. The integrated diagnostic monitoring allows us to set custom thresholds for optical power degradation, enabling proactive maintenance before any link drop occurs. Overall build quality and optical performance match enterprise-grade standards.

87 Helpful vote Comments

C***s

Norway

Verified Purchase

5 .0

2026-05-25

Deployed a batch of these LQ-CW400-FR4C transceiver modules for 400G optics backhaul links between equipment shelters. The CWDM wavelengths align perfectly with our optical multiplexers. Operates reliably across variable cabinet temperatures.

95 Helpful vote Comments

C***e

New Zealand

Verified Purchase

5 .0

2026-04-22

Gets the full 2km over standard SMF with zero errors, perfect for our inter-building links. Duplex LC receptacle saved us from re-terminating all the MPO trunks.

85 Helpful vote Comments

I***l

Brazil

Verified Purchase

5 .0

2026-04-03

2km reach on SMF with DOM monitoring — clean install, zero errors.

53 Helpful vote Comments

L***s

Republic of Korea

Verified Purchase

5 .0

2026-03-30

DOM data reads spot-on in our NMS, great for proactive monitoring.

62 Helpful vote Comments

N***e

Poland

Verified Purchase

5 .0

2026-03-09

Deployed these modules across our multi-building campus network over a 1.8km duplex LC single-mode link. Signal attenuation measured well within the optical power budget. The QSFP112 form factor fits snugly into high-density switch ports with efficient heat dissipation. Transmitter optical dispersion penalty remains minimal, ensuring clean PAM4 signaling even during high ambient temperature fluctuations inside the equipment room.

99 Helpful vote Comments

E***z

Philippines

Verified Purchase

5 .0

2026-02-27

Installed in our enterprise main distribution frame operating at standard 0°C to 70°C commercial temperatures. Case stays cool under full load and power consumption is surprisingly low for a 400G optical module.

117 Helpful vote Comments

G***s

Canada

Verified Purchase

5 .0

2026-01-22

Fast shipping, neat ESD packaging, smooth deployment overall!

41 Helpful vote Comments

J***k

Ireland

Verified Purchase

4 .0

2026-01-19

Delivery was 2 days late, but this 400G-FR4 module performs as advertised. Would order again despite the wait.

19 Helpful vote Comments

K***z

South Africa

Verified Purchase

5 .0

2026-01-04

The optical LC interface snaps in tightly and the pull tab feels durable. Being able to check real-time laser bias and temperature directly from the CLI makes maintenance effortless.

51 Helpful vote Comments

M***s

Italy

Verified Purchase

5 .0

2025-12-21

Needed a budget-friendly 400G QSFP112 optical module supporting 100G PAM4 per lane for our short-haul 2km link. Handled continuous heavy traffic during weekend load tests without thermal throttling. Very pleased with the price-to-performance ratio.

103 Helpful vote Comments

B***s

Turkey

Verified Purchase

4 .0

2025-12-08

Product arrived in good condition, just a bit delayed due to customs clearance. No issues with the transceiver itself – hits full 2km spec.

37 Helpful vote Comments

J***z

India

Verified Purchase

5 .0

2025-11-19

Plug-and-play with our edge switches, 1310nm wavelength perfect for existing fiber.

86 Helpful vote Comments

S***n

Belgium

Verified Purchase

5 .0

2025-11-11

The 4 CWDM lanes (1271/1291/1311/1331nm) multiplex neatly over one duplex LC pair. No wavelength drift after weeks of 400G traffic.

94 Helpful vote Comments

J***z

Russian Federation

Verified Purchase

5 .0

2025-10-29

Using these 400G-FR4 modules to cross-connect two high-density server racks via standard single-mode patch cords. Link training completed instantly and DOM telemetry feeds smoothly into our network manager dashboard.

109 Helpful vote Comments

A***r

Spain

Verified Purchase

5 .0

2025-09-09

Upgraded our campus distribution layer using this 400G QSFP112 FR4 module over 1.2km duplex LC SMF. Line rate is stable with zero frame drops during peak hours. DOM metrics map accurately to our monitoring platform.

88 Helpful vote Comments

F***n

France

Verified Purchase

5 .0

2025-08-14

Perfect 4 x 100G PAM4 single-lambda performance. DDM readings are spot on.

50 Helpful vote Comments

P***n

Indonesia

Verified Purchase

5 .0

2025-08-04

400G-FR4 and 100G Lambda MSA compliant, so it works with both 400G and 100G per-lane modes. The 4x106. 25Gb/s 400GAUI-4 electrical interface syncs cleanly on every port we tested.

141 Helpful vote Comments

K***l

Mexico

Verified Purchase

5 .0

2025-07-28

Low power draw, runs cool even in dense 400G chassis.

48 Helpful vote Comments

D***z

Finland

Verified Purchase

5 .0

2025-07-19

Our engineering team integrated this 400G QSFP112 transceiver module into our standard monitoring infrastructure via SNMP DDM polling. The optical output levels line up precisely with manufacturer datasheets across the entire commercial operating temperature spectrum. The duplex LC connector mechanism provides low insertion loss and high return loss characteristics. It passed full-throughput packet loss tests and link flapping checks without a single anomaly. Fantastic alternative to overpriced original modules.

103 Helpful vote Comments

R***z

Thailand

Verified Purchase

5 .0

2025-06-18

Purchased 50 units for a client data center expansion project. EEPROM diagnostics read clean and Tx output power is consistently balanced across all 4 CWDM channels.

76 Helpful vote Comments

G***e

Ukraine

Verified Purchase

5 .0

2025-05-14

Evaluated this 400G 2km single-mode optical module for medium-reach metro distribution spans. Tested over various fiber lengths up to 1.6km; receiver sensitivity easily handled the attenuation without requiring external optical attenuators or amplifiers. The module locked onto the 100G PAM4 signals swiftly upon insertion, maintaining stable line-rate throughput under full load while keeping power consumption well under its 10W max rating. Fits our requirement for low-power, high-density 400G network deployments seamlessly.

110 Helpful vote Comments

H***s

Australia

Verified Purchase

5 .0

2025-05-09

Blazing fast 400G over duplex LC, exactly what our campus backbone needed.

74 Helpful vote Comments

V***s

Singapore

Verified Purchase

5 .0

2025-04-01

Was slightly anxious about non-OEM optics on our core switch fleet, but this QSFP112 module was detected right away. RX power levels stay right in the optimal range. Will definitely order more for phase two!

61 Helpful vote Comments

A***n

Malaysia

Verified Purchase

5 .0

2025-03-24

Transitioning our core backbone from 100G to 400G using this QSFP112 FR4 transceiver module saved us substantial capital compared to tier-1 vendor list prices. Plugged in, recognized, working great!

118 Helpful vote Comments

N***z

Netherlands

Verified Purchase

5 .0

2025-02-11

CWDM EML transmitter is stable, no wavelength drift after weeks of load.

75 Helpful vote Comments

D***n

Austria

Verified Purchase

5 .0

2025-01-08

We evaluated this 400G QSFP112 FR4 transceiver for our data center spine-leaf upgrade over 1.5km OS2 single-mode fiber. The module utilizes 4 x 100G PAM4 modulation centered around the CWDM wavelength. Optical spectrum analysis verified clean channel separation with negligible crosstalk. Internal DOM telemetry provides real-time tracking for operating temperature, supply voltage, laser bias current, and optical launch/receive power. After a 48-hour continuous line-rate soak test, zero uncorrectable FEC errors were registered. A top-tier optical solution for enterprise architectures.

132 Helpful vote Comments