What is the maximum data rate supported by this SFP module?

This module supports high-performance data rates up to 1.25Gbps for gigabit networks.

What type of fiber cable should be used with the SFP1G-SX-31-I?

It is designed exclusively for single-mode fiber (SMF) networks via duplex LC connectors.

How far can this optical transceiver transmit data safely?

It reliably transmits high-speed optical signals up to a maximum distance of 2km.

What is the operating temperature range for this industrial module?

This rugged industrial-grade module operates perfectly from -40°C up to +85°C.

Hey guys, will this 1.25G SFP module work seamlessly with my existing Cisco Catalyst switches and Netgear routers?

Yes! The LS-SM311G-02I is extensively tested for OEM compatibility. It functions flawlessly with major networking equipment brands out of the box, including Cisco, Netgear, Juniper, and Arista.

I need to bridge a 1.5km gap using single-mode fiber. Does this LC module fit the bill, or do I need multi-mode?

You found the right module! This transceiver uses a 1310nm FP laser transmitter optimized specifically for Single-Mode Fiber (SMF). Its Duplex LC interface guarantees secure connections for distances up to 2km.

Our outdoor IP camera enclosures face brutal summer heat. Can this industrial version survive those harsh temperature spikes?

Without a doubt. This industrial-grade SFP transceiver is heavily ruggedized, ensuring ultra-stable 1.25Gbps data transmission in extreme operating temperatures from a freezing -40°C all the way up to +85°C.

Does this optical module support real-time health tracking? We require strict SFF-8472 protocol compliance for our network management software.

Yes, it is fully SFF-8472 MSA compliant and features advanced DOM (Digital Optical Monitoring) and DDM support. Network admins can easily track real-time diagnostics like transceiver temperature, voltage, and optical TX/RX power remotely.

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Generic SFP1G-SX-31-I Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: Generic SFP1G-SX-31-I Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 212614
Price: 5.59 USD
Availability: InStock
Rating: 5 (36 reviews)

# 212614

Product: Generic SFP1G-SX-31-I Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 212614
P/N: LS-SM311G-02I
Price: $ 6.5
Stock: 500 in Stock
Sold: 205
Product URL: https://www.l-p.com/products/494888.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

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Manufacture: LINK-PP

P/N: LS-SM311G-02I

Compatible:: Cisco; LINK-PP; Adtran; Alcatel-Lucent; Arista; Avaya; Brocade; Calix; Ciena; Dell; Extreme; FS; Fortinet; Generic; H3C; IBM; Intel; Juniper; NVIDIA/Mellanox; Netgear

Compatible P/N:: SFP1G-SX-31 | 2km; SFP1G-SX-31-I | 2km; SFP1G-LX-31 | 10km; SFP1G-LX-31-I | 10km; SFP1G-ELX-31 | 20km; SFP1G-LX-31 | 20km; SFP1G-EX-31 | 40km; SFP1G-EX-31-I | 40km; SFP1G-EX-55 | 40km; SFP1G-ZX-55 | 80km; SFP1G-ZX-55-I | 80km; SFP1G-ZX100-55 | 100km; SFP1G-ZX120-55 | 120km; SFP1G-ZX160-55 | 160km

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Generic SFP1G-SX-31-I Compatible LINK-PP 1.25G SFP Specifications

The Generic SFP1G-SX-31-I Compatible LINK-PP module is a high-performance 1.25Gbps SFP transceiver engineered for single-mode fiber infrastructure. It features a 1310nm FP laser transmitter paired with a highly sensitive PIN photodiode receiver. Operating on a stable +3.3V power supply, this hot-pluggable module fully complies with standard SFP MSA and SFF-8472 specifications. It delivers efficient gigabit data transmission.

Generic Part Number	SFP1G-SX-31-I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm	Max Cable Distance	2km
Connector	Duplex LC	Media	SMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-12 to -3dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-23dBm	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 1.25G SFP module work seamlessly with my existing Cisco Catalyst switches and Netgear routers? By P***z on 2026-03-24

A: Yes! The LS-SM311G-02I is extensively tested for OEM compatibility. It functions flawlessly with major networking equipment brands out of the box, including Cisco, Netgear, Juniper, and Arista. By admin on 2026-03-24
Q: I need to bridge a 1.5km gap using single-mode fiber. Does this LC module fit the bill, or do I need multi-mode? By J***r on 2025-12-04

A: You found the right module! This transceiver uses a 1310nm FP laser transmitter optimized specifically for Single-Mode Fiber (SMF). Its Duplex LC interface guarantees secure connections for distances up to 2km. By admin on 2025-12-04
Q: Our outdoor IP camera enclosures face brutal summer heat. Can this industrial version survive those harsh temperature spikes? By K***n on 2025-11-29

A: Without a doubt. This industrial-grade SFP transceiver is heavily ruggedized, ensuring ultra-stable 1.25Gbps data transmission in extreme operating temperatures from a freezing -40°C all the way up to +85°C. By admin on 2025-11-30
Q: Does this optical module support real-time health tracking? We require strict SFF-8472 protocol compliance for our network management software. By W***z on 2025-09-12

A: Yes, it is fully SFF-8472 MSA compliant and features advanced DOM (Digital Optical Monitoring) and DDM support. Network admins can easily track real-time diagnostics like transceiver temperature, voltage, and optical TX/RX power remotely. By admin on 2025-09-12

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K***t

Norway

Verified Purchase

5 .0

2026-05-06

Flawless Cisco compatibility out of the box!

233 Helpful vote Comments

M***n

Mexico

Verified Purchase

5 .0

2026-04-20

Tested with Cisco and Juniper switches for our base station backhaul. 1310nm FP transmitter pushes perfectly to 2km on SMF with zero packet loss. Excellent B2B alternative for enterprise deployments.

248 Helpful vote Comments

C***s

Canada

Verified Purchase

5 .0

2026-04-19

The DDM stats read perfectly on my Fortinet firewall. Awesome industrial SFP module!

238 Helpful vote Comments

J***r

Ukraine

Verified Purchase

5 .0

2026-02-11

Replaced failing modules in a factory floor rack where temps hit 80°C. This wide-temp transceiver didn't flinch. Duplex LC interface snapped in tight. Definitely our go-to 1.25Gbps SFP moving forward.

171 Helpful vote Comments

M***n

Peru

Verified Purchase

5 .0

2025-12-19

Reliable optical transceiver module for extreme heat environments. No connection drops so far.

83 Helpful vote Comments

M***r

Poland

Verified Purchase

5 .0

2025-12-14

Instant plug-and-play with our Dell switches.

85 Helpful vote Comments

S***z

Peru

Verified Purchase

5 .0

2025-12-12

Handles 85°C operating temp like a champ.

82 Helpful vote Comments

D***n

Netherlands

Verified Purchase

5 .0

2025-08-22

Great SMF optical transceiver for the price.

207 Helpful vote Comments

J***t

Singapore

Verified Purchase

5 .0

2025-08-04

Hard to tell on your site what the quantity of an item is in your shopping cart. Had to add the item twice.

31 Helpful vote Comments

M***n

Germany

Verified Purchase

5 .0

2025-07-20

Bought a batch for CCTV backhaul. Solid 1310nm wavelength performance across 1.5 miles.

231 Helpful vote Comments

C***n

United States

Verified Purchase

5 .0

2025-07-14

Lots of products but hard to find the exact one I need.

36 Helpful vote Comments

B***r

Canada

Verified Purchase

5 .0

2025-06-01

Good prices and value

37 Helpful vote Comments

D***z

Malaysia

Verified Purchase

5 .0

2025-05-21

DOM readings are highly accurate. Good stuff!

129 Helpful vote Comments

A***a

Thailand

Verified Purchase

5 .0

2025-05-12

Excellent Quality and Good Service

89 Helpful vote Comments

P***e

South Africa

Verified Purchase

5 .0

2025-04-29

Solid 1310nm performance. Will buy again.

159 Helpful vote Comments

G***p

Brazil

Verified Purchase

5 .0

2025-04-02

placed my order, made my payment, but it was was shipped slowly.

59 Helpful vote Comments

P***n

Argentina

Verified Purchase

4 .0

2025-02-15

OEM compatibility is great, just wish the bulk packaging was a bit more secure.

188 Helpful vote Comments

T***r

Turkey

Verified Purchase

5 .0

2025-01-12

Great price, great product!

85 Helpful vote Comments

C***z

Turkey

Verified Purchase

5 .0

2024-12-30

Everything I've bought has been great and the website is easy to use.

72 Helpful vote Comments

P***k

Russian Federation

Verified Purchase

5 .0

2024-12-01

Duplex LC connector fits perfectly into our Netgear gear. Good 1.25G transceiver overall.

90 Helpful vote Comments

M***e

Hong Kong

Verified Purchase

5 .0

2024-10-28

Upgraded our NAS networking with these DOM-enabled SFP modules. SFF-8472 protocol support works flawlessly. Real-time DDM diagnostics are a lifesaver for troubleshooting remote node connectivity. Highly recommend for telecom use!

193 Helpful vote Comments

N***r

Thailand

Verified Purchase

5 .0

2024-10-18

Perfect 2km transmission for our multi-building fiber network. Arrived fast in Texas!

88 Helpful vote Comments

i***d

Norway

Verified Purchase

5 .0

2024-08-18

Very knowledgeable, quick responses, very good prices and great customer service

89 Helpful vote Comments

R***e

Russian Federation

Verified Purchase

5 .0

2024-08-04

Very Very good service. Ordered product and received before the date that was given.

60 Helpful vote Comments

A***v

India

Verified Purchase

5 .0

2024-06-06

The experience this time is very good. Their responses are always quick and useful. The services are much appreciated. These make us feel at ease. We have nothing to complain about these modules. They are well packaged, easy to deploy. They make no packet loss. High performances for us.

105 Helpful vote Comments

J***s

United States

Verified Purchase

5 .0

2024-05-10

Great selection and prices. Easy checkout.

43 Helpful vote Comments

J***n

Netherlands

Verified Purchase

5 .0