Can I achieve the full 350m transmission range on older OM3 multimode fiber?

On standard OM3 fiber, the maximum transmission distance is 240 meters. To hit the full 350m rating, you will need OM4 fiber. If your facility happens to be wired with OM5, the range extends even further up to 440 meters.

Will this 40G QSFP+ SWDM4 module play nice with a mixed Cisco and Arista core setup?

Yes! It natively supports QSFP+ MSA protocols and seamlessly connects different OEM hardware. Our enterprise clients regularly verify plug-and-play interoperability across Cisco, Arista, and Broadcom switches without any vendor lock-in issues or CLI errors.

How does using this module lower our total cost of ownership (TCO) compared to standard 40G SR4 transceivers?

The biggest TCO saving is in your fiber infrastructure. Standard SR4 modules require expensive 8-fiber MTP/MPO cables, whereas this SWDM4 uses standard Duplex LC MMF. You can push 40G over your existing 10G OM3/OM4 infrastructure, completely avoiding massive re-cabling costs.

Do these transceivers comply with IEEE 802.3ba and support standard DOM monitoring?

Yes, they strictly adhere to IEEE 802.3ba, QSFP+ MSA, and SFF-8636 industry standards. The built-in DOM (Digital Optical Monitoring) allows real-time tracking of TX/RX optical power, voltage, bias current, and temperature directly through your switch's I2C interface.

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HW QSFP-40G-SR-BD Compatible LINK-PP 40G QSFP+ SWDM4 350m Duplex LC DOM MMF Optical Transceiver Module

Name: HW QSFP-40G-SR-BD Compatible LINK-PP 40G QSFP+ SWDM4 350m Duplex LC DOM MMF Optical Transceiver Module
Brand: LINK-PP
SKU: 217867
Price: 221.02 USD
Availability: InStock
Rating: 4.9 (16 reviews)

# 217867

Product: HW QSFP-40G-SR-BD Compatible LINK-PP 40G QSFP+ SWDM4 350m Duplex LC DOM MMF Optical Transceiver Module
SKU: 217867
P/N: LQ-SW40-SR4C
Price: $ 257
Stock: 125 in Stock
Sold: 1.9K
Product URL: https://www.l-p.com/products/491489.htm

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Manufacture: LINK-PP

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Compatible:: Cisco; LINK-PP; Arista; Broadcom; Brocade; Dell; Extreme; FS; Fortinet; Generic; H3C; HPE Aruba; HW; Intel; Juniper; NVIDIA/Mellanox; Netgear; Palo Alto

Compatible P/N:: QSFP-40G-SR-BD | 100m; QSFP-40G-iSR4 | 300m; QSFP-40G-SR-BD | 350m; 02311YVB | 2km; QSFP-40G-LR4-Lite | 2km; QSFP-40G-LR4 | 10km; QSFP-40G-eSM4 | 10km; QSFP-ELR4-40G | 20km; QSFP-40G-ER4 | 40km; QSFPP-40G-ZR4-Lite | 60km; QSFPP-40G-ZR4 | 80km; QSFPP-40G-EZR4-HW | 100km

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HW QSFP-40G-SR-BD Compatible LINK-PP 40G QSFP+ Specifications

The HW QSFP-40G-SR-BD Compatible LINK-PP 40G QSFP+ is a highly efficient SWDM4 optical transceiver designed for robust 40G Ethernet networks. This hot-pluggable module utilizes advanced multiplexing over duplex multimode fiber, delivering up to 41.2Gbps aggregate bandwidth. With its low power dissipation under 3.5W, it provides a cost-effective upgrade path for enterprise data centers.

HW Part Number	QSFP-40G-SR-BD	Vendor Name	LINK-PP
Form Factor	QSFP+	Max Data Rate	40Gbps
Wavelength	850nm, 880nm, 910nm, 940nm	Max Cable Distance	350m
Connector	Duplex LC	Media	MMF
Transmitter Type	VCSEL	Receiver Type	PIN
Operating Temperature Range	0°C to +70°C	EMC (Electro Magnetic Compatibility)	Supported
DDM/DOM	Supported	Protocols	QSFP+ MSA, SWDM MSA, SFF-8636, IEEE 802.3ba, XLPPI electrical interface

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Q: Can I achieve the full 350m transmission range on older OM3 multimode fiber? By M***n on 2026-02-20

A: On standard OM3 fiber, the maximum transmission distance is 240 meters. To hit the full 350m rating, you will need OM4 fiber. If your facility happens to be wired with OM5, the range extends even further up to 440 meters. By admin on 2026-02-21
Q: Will this 40G QSFP+ SWDM4 module play nice with a mixed Cisco and Arista core setup? By M***a on 2026-02-20

A: Yes! It natively supports QSFP+ MSA protocols and seamlessly connects different OEM hardware. Our enterprise clients regularly verify plug-and-play interoperability across Cisco, Arista, and Broadcom switches without any vendor lock-in issues or CLI errors. By admin on 2026-02-20
Q: How does using this module lower our total cost of ownership (TCO) compared to standard 40G SR4 transceivers? By L***s on 2026-02-17

A: The biggest TCO saving is in your fiber infrastructure. Standard SR4 modules require expensive 8-fiber MTP/MPO cables, whereas this SWDM4 uses standard Duplex LC MMF. You can push 40G over your existing 10G OM3/OM4 infrastructure, completely avoiding massive re-cabling costs. By admin on 2026-02-17
Q: Do these transceivers comply with IEEE 802.3ba and support standard DOM monitoring? By A***e on 2026-01-18

A: Yes, they strictly adhere to IEEE 802.3ba, QSFP+ MSA, and SFF-8636 industry standards. The built-in DOM (Digital Optical Monitoring) allows real-time tracking of TX/RX optical power, voltage, bias current, and temperature directly through your switch's I2C interface. By admin on 2026-01-19

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C***r

Spain

Verified Purchase

5 .0

2026-05-20

Needed a robust 40G link between buildings. This module pushed full 40Gbps over 350m of OM4 without a single CRC error. The VCSEL/PIN combo operates well within the 0°C to 70°C spec. Highly impressed!

170 Helpful vote Comments

N***e

Poland

Verified Purchase

5 .0

2025-11-14

Great 40G throughput for my home NAS!

100 Helpful vote Comments

D***z

Denmark

Verified Purchase

5 .0

2025-09-03

Solid QSFP+ MSA compatibility, zero dropouts.

113 Helpful vote Comments

R***n

Czech Republic

Verified Purchase

4 .0

2025-08-24

Box arrived a bit crushed, but the 40G QSFP+ SWDM4 transceiver works perfectly fine.

48 Helpful vote Comments

E***r

Colombia

Verified Purchase

5 .0

2025-08-09

We use these for fast cell tower backhaul testing. Stable 41.2Gbps aggregate bandwidth.

85 Helpful vote Comments

L***e

Argentina

Verified Purchase

5 .0

2025-04-24

Great 40G Duplex LC MMF optical module. No need to re-terminate with MPO connectors!

188 Helpful vote Comments

P***l

Canada

Verified Purchase

5 .0

2025-04-04

Perfect for our campus OM4 fiber upgrade.

159 Helpful vote Comments

J***n

Switzerland

Verified Purchase

5 .0

2025-03-14

Duplex LC interface makes patching super easy.

116 Helpful vote Comments

J***s

Chile

Verified Purchase

5 .0

2025-01-25

Saved us from running new MPO cables!

179 Helpful vote Comments

J***a

Switzerland

Verified Purchase

5 .0

2025-01-17

Tested these SWDM4 modules in an outdoor cabinet at 65°C, no thermal throttling.

27 Helpful vote Comments

T***s

Austria

Verified Purchase

5 .0

2024-12-28

VCSEL transmitters run cool under heavy load. ❄️

161 Helpful vote Comments

E***s

Bolivia

Verified Purchase

5 .0

2024-12-20

Upgrading our campus network was easy since it reuses existing OM3 duplex fiber.

162 Helpful vote Comments

C***e

Singapore

Verified Purchase

5 .0

2024-12-16

We deployed 50 of these 40G QSFP+ SWDM4 transceivers for a major data center overhaul. Reusing our legacy duplex LC MMF saved thousands on MPO cabling. DOM monitoring via I2C is flawless on Mellanox.

138 Helpful vote Comments

E***z

Peru

Verified Purchase

5 .0

2024-12-06

Linked right up on our Dell racks.

104 Helpful vote Comments

D***n

Argentina

Verified Purchase

5 .0