What is the maximum data rate of this SFP module?

The module supports standard data rates up to 1.25Gbps for Gigabit Ethernet applications.

What fiber type and distance does it support?

It supports single-mode fiber (SMF) for long-reach transmissions up to 40km.

What is the operating temperature range of this transceiver?

This industrial-grade module operates reliably from -40°C to +85°C.

Does the LS-SM311G-40AI support real-time diagnostic monitoring?

Yes, it features integrated Digital Diagnostic Monitoring (DDM/DOM) via an I2C interface.

Hey guys, will this LS-SM311G-40AI transceiver work with my mixed rack of Cisco and Juniper switches? We need seamless OEM compatibility.

Absolutely! This 1.25G SFP module is strictly SFF-8472 MSA compliant, ensuring 100% plug-and-play compatibility with Cisco, Juniper, Ubiquiti, and other major OEM network equipment.

Our outdoor ISP cabinets get extremely hot in summer and freezing in winter. Can this 1310nm SFP module handle extreme weather?

Definitely. This is an industrial-grade optical module designed with a rugged operating temperature range from -40°C to +85°C, making it perfect for unheated outdoor cabinets, harsh environments, and cell tower deployments.

We need this for an enterprise PLC automation network. Does it support real-time digital diagnostics and comply with standard Ethernet protocols?

Yes, it fully supports integrated DDM/DOM via an I2C interface for real-time monitoring of temperature, voltage, and laser bias. It is also compliant with the IEEE 802.3ah-2004 protocol, ensuring highly robust performance for industrial communication setups.

Just confirming before I order—does this require single-mode or multi-mode fiber, and what kind of connector does it use for the 40km run?

This specific module is designed exclusively for Single-Mode Fiber (SMF) using a standard Duplex LC connector interface. It utilizes a highly efficient 1310nm DFB laser to reliably push data up to a 40km transmission distance.

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LINK-PP LS-SM311G-40AI 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-SM311G-40AI 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 201970
Price: 7.31 USD
Availability: InStock
Rating: 4.9 (43 reviews)

# 201970

Product: LINK-PP LS-SM311G-40AI 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 201970
P/N: LS-SM311G-40AI
Price: $ 8.5
Stock: 100 in Stock
Sold: 900
Product URL: https://www.l-p.com/products/491454.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

43 Reviews

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Manufacture: LINK-PP

P/N: LS-SM311G-40AI

Compatible:: LINK-PP

Compatible P/N:: LS-SM311G-02C | 2km; LS-SM311G-02I | 2km; LS-SM311G-10C | 10km; LS-SM311G-10I | 10km; LS-SM311G-20C | 20km; LS-SM311G-20I | 20km; LS-SM311G-40AI | 40km; LS-SM311G-40C | 40km; LS-SM311G-40I | 40km; LS-SM551G-40C | 40km; LS-SM551G-40I | 40km; LS-SM551G-60C | 60km; LS-SM551G-60I | 60km; LS-SM551G-80C | 80km; LS-SM551G-80I | 80km; LS-SM551G-A0C | 100km; LS-SM551G-A0I | 100km; LS-SM551G-A2C | 120km; LS-SM551G-A2I | 120km; LS-SM551G-A6C | 160km; LS-SM551G-A6I | 160km

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LINK-PP LS-SM311G-40AI 1.25G SFP Specifications

The LINK-PP LS-SM311G-40AI is a high-performance, small form-factor pluggable optical transceiver engineered for dual-rate data transmissions. Operating over a reliable 1310nm distributed feedback laser, this single-mode module delivers consistent 1.25Gbps network connectivity across extended distances. Built with an integrated PIN photodiode and trans-impedance preamplifier, it guarantees robust signal processing for critical networking infrastructure.

LINK-PP Part Number	LS-SM311G-40AI	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm	Max Cable Distance	40km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-5 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-30dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Hey guys, will this LS-SM311G-40AI transceiver work with my mixed rack of Cisco and Juniper switches? We need seamless OEM compatibility. By M***r on 2025-08-21

A: Absolutely! This 1.25G SFP module is strictly SFF-8472 MSA compliant, ensuring 100% plug-and-play compatibility with Cisco, Juniper, Ubiquiti, and other major OEM network equipment. By admin on 2025-08-21
Q: Our outdoor ISP cabinets get extremely hot in summer and freezing in winter. Can this 1310nm SFP module handle extreme weather? By N***n on 2025-07-29

A: Definitely. This is an industrial-grade optical module designed with a rugged operating temperature range from -40°C to +85°C, making it perfect for unheated outdoor cabinets, harsh environments, and cell tower deployments. By admin on 2025-07-29
Q: We need this for an enterprise PLC automation network. Does it support real-time digital diagnostics and comply with standard Ethernet protocols? By S***s on 2025-07-18

A: Yes, it fully supports integrated DDM/DOM via an I2C interface for real-time monitoring of temperature, voltage, and laser bias. It is also compliant with the IEEE 802.3ah-2004 protocol, ensuring highly robust performance for industrial communication setups. By admin on 2025-07-18
Q: Just confirming before I order—does this require single-mode or multi-mode fiber, and what kind of connector does it use for the 40km run? By D***a on 2025-05-08

A: This specific module is designed exclusively for Single-Mode Fiber (SMF) using a standard Duplex LC connector interface. It utilizes a highly efficient 1310nm DFB laser to reliably push data up to a 40km transmission distance. By admin on 2025-05-08

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K***n

Sweden

Verified Purchase

5 .0

2026-05-22

We bought a batch of these industrial grade sfp modules for our campus fiber network. Excellent 1310nm DFB laser performance! SFF-8472 DOM reporting is super accurate on our Cisco gear. (^_^)v

99 Helpful vote Comments

C***z

Colombia

Verified Purchase

5 .0

2026-04-29

Top-notch 40km smf transceiver module!

77 Helpful vote Comments

D***l

Macao

Verified Purchase

5 .0

2026-04-08

Perfect duplex LC connection for our campus.

61 Helpful vote Comments

S***z

Canada

Verified Purchase

5 .0

2026-04-04

Cheap and reliable industrial 1g sfp. Pushed it to 35km without any signal degradation.

130 Helpful vote Comments

E***l

Canada

Verified Purchase

5 .0

2026-02-17

Best industrial grade SFP for outdoor cabinets.

156 Helpful vote Comments

S***h

Malaysia

Verified Purchase

5 .0

2026-01-08

Perfect duplex lc dom optical module for remote node links. Totally plug-and-play!

157 Helpful vote Comments

T***l

Switzerland

Verified Purchase

5 .0

2025-12-12

Real-time DOM monitoring is a lifesaver!

86 Helpful vote Comments

B***e

Chile

Verified Purchase

5 .0

2025-11-22

SFP DDM reading is accurate. Excellent OEM compatibility across our entire server rack!

149 Helpful vote Comments

D***n

Italy

Verified Purchase

5 .0

2025-11-11

Industrial 1.25g sfp works exactly as advertised.

127 Helpful vote Comments

P***z

Spain

Verified Purchase

5 .0

2025-11-08

Good 1310nm smf transceiver for my 1G NAS fiber uplink. Very stable ping.

71 Helpful vote Comments

N***z

Belgium

Verified Purchase

5 .0

2025-09-21

very happy with the purchases at fs.com and grateful for the good work!

39 Helpful vote Comments

J***z

Costa Rica

Verified Purchase

5 .0

2025-09-02

Great 1310nm DFB laser, zero packet loss.

114 Helpful vote Comments

L***s

Czech Republic

Verified Purchase

5 .0

2025-07-16

Deployed these 1.25G 40km SMF modules for an outdoor cell tower backhaul. The -40 to 85°C industrial rating is legit. Passed our multi-brand switch compatibility test with zero DDM drops.

118 Helpful vote Comments

P***n

India

Verified Purchase

5 .0

2025-07-13

Rock solid 40km transmission distance. (≧◡≦)

55 Helpful vote Comments

J***z

Colombia

Verified Purchase

5 .0

2025-06-23

The SFF-8472 MSA compliant chip works seamlessly with our mixed HP and Ubiquiti switches.

103 Helpful vote Comments

P***e

New Zealand

Verified Purchase

5 .0

2025-06-23

Thank you for the products and the service.

31 Helpful vote Comments

A***n

Costa Rica

Verified Purchase

5 .0

2025-06-02

Nice to have DOM support in a budget-friendly industrial optical transceiver module.

183 Helpful vote Comments

L***s

Norway

Verified Purchase

5 .0

2025-05-28

Solid buy! This 1.25g sfp 40km transceiver handles our harsh warehouse temps flawlessly.

70 Helpful vote Comments

M***n

Italy

Verified Purchase

5 .0

2025-05-06

installed a couple days ago on our test bed, seems to work perfectly fine.Will probably buy again

70 Helpful vote Comments

M***s

Colombia

Verified Purchase

5 .0

2025-04-20

Needed a rugged 1.25Gbps SFP 1310nm 40km duplex LC module for an unheated outdoor cabinet. Survived freezing nights perfectly! The DOM support helps my IT team monitor temps remotely. ❄️

132 Helpful vote Comments

R***e

Netherlands

Verified Purchase

5 .0

2025-03-31

No problem so far after quite a few orders over the past few years.

25 Helpful vote Comments

M***w

United Kingdom

Verified Purchase

5 .0

2025-03-11

I needed to cancel and re-order to change shipping method and Yoeng was very helpful making that happen.

45 Helpful vote Comments

C***e

Czech Republic

Verified Purchase

5 .0

2025-02-12

Plug and play SFP! Highly recommended.

180 Helpful vote Comments

J***n

Canada

Verified Purchase

5 .0

2025-02-10

Can't say enough about the quality of Link-pp's customer service and quality products. Shop with confidence. They stand behind their stuff and are always quick, courtious and knowledgable!

91 Helpful vote Comments

M***e

India

Verified Purchase

4 .0

2025-02-05

Great 40km smf transceiver module, though I wish the duplex LC dust caps were tighter.

180 Helpful vote Comments

B***l

Netherlands

Verified Purchase

5 .0

2024-11-18

Fast shipping on this 1g optical module.

112 Helpful vote Comments

S***o

Hong Kong

Verified Purchase

5 .0

2024-09-04

This is one of the best places to shop online. Not only is the selection & pricing incredible, the ease of use of the store is absolutely fantastic!! The whole process went very smoothly.

24 Helpful vote Comments

N***z

Russian Federation

Verified Purchase

5 .0

2024-09-01

Quick delivery and great item. works perfect.

70 Helpful vote Comments

R***S

Germany

Verified Purchase

5 .0

2024-08-24

It was actually Faster than I expected, I will certainly use l-p.com again soon.

33 Helpful vote Comments

D***n

Indonesia

Verified Purchase

5 .0

2024-08-21

l-p.com provided excellent customer service again and helped us to get what we were looking for.

31 Helpful vote Comments

C***n

United States

Verified Purchase

5 .0

2023-12-14

The module is of good quality and the most important is its very competitive price.

55 Helpful vote Comments

J***e

Germany

Verified Purchase

5 .0

2023-09-15

Fast shipping and pleasant service. Will definitely recommended to my family and friends.

75 Helpful vote Comments

C***n

Lithuania

Verified Purchase

4 .0

2023-09-01

Product looks good excellent and works like a charm.

76 Helpful vote Comments

R***h

Republic of Korea

Verified Purchase

5 .0

2023-04-07

Very quick shipping.

83 Helpful vote Comments

T***a

France

Verified Purchase

5 .0

2023-01-06

So far so good. I hope my order is on time and works well.

59 Helpful vote Comments

P***d

Romania

Verified Purchase

5 .0

2022-12-02

So far the Transceiver Modules are working gworking reat. No drop, no error

33 Helpful vote Comments

F***a

Taiwan, Province of China

Verified Purchase

5 .0

2022-09-13

Based on this, my first purchase from Link-pp, I will definitely continue shopping through Link-pp. The products are top of the line, and the price is almost unbeatable by any other providers.

88 Helpful vote Comments

D***n

Morocco

Verified Purchase

5 .0

2022-08-28

I've always been satisfied with the selection and prices you guys offer. You guys ROCK!

95 Helpful vote Comments

C***o

Norway

Verified Purchase

5 .0