Hey, we're running a mixed environment with Cisco Catalyst and newer Arista switches. Will this transceiver trigger any "unsupported module" errors?

No worries at all. The LS-SM311G-40C is 100% MSA compliant and we code it to be fully compatible with major OEMs including Cisco, Arista, Juniper, and HPE. You can plug and play without manual bypass commands.

Does the DOM feature on this module support standard SFF-8472? We need to pull laser bias and Tx/Rx optical power data into our monitoring software.

Yes, it does! The integrated Digital Optical Monitoring (DOM/DDM) fully complies with the SFF-8472 standard and IEEE 802.3ah-2004 protocols. Your NMS will seamlessly pull real-time diagnostics like temp, voltage, and Rx/Tx power levels straight from the transceiver.

I'm an IT admin planning a massive data center upgrade. If I need around 2,000 pieces of these 1.25G SFP modules, is there any bulk pricing available?

Absolutely! For large batch deployments, we offer tiered volume discounts. If you're ordering 1,000+ units, there will be a good price, and you can contact our sales team directly for specific net terms and additional project discounts!

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FS SFP1G-EX-31 Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module

Name: FS SFP1G-EX-31 Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 212791
Price: 9.46 USD
Availability: InStock
Rating: 5 (29 reviews)

# 212791

Product: FS SFP1G-EX-31 Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module
SKU: 212791
P/N: LS-SM311G-40C
Price: $ 11
Stock: 945 in Stock
Sold: 1.3K
Product URL: https://www.l-p.com/products/495148.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-40C

Compatible:: Cisco; LINK-PP; Adtran; Alcatel-Lucent; Allied Telesis; Arista; Avaya; Broadcom; Brocade; Calix; Ciena; D-Link; Dell; Extreme; FS; Generic; H3C; HPE; HPE H3C; HW; IBM; Intel; Juniper; MikroTik; TRENDnet; Ubiquiti

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-EX-31 | 40km; SFP1G-EX-31-I | 40km; SFP1G-EX-55 | 40km; SFP1G-EX-55-I | 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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FS SFP1G-EX-31 Compatible LINK-PP 1.25G SFP Specifications

The FS SFP1G-EX-31 Compatible LINK-PP module is a commercial-grade 1.25G SFP optical transceiver designed for Gigabit Ethernet applications. Operating at 1310nm over single-mode fiber, it supports transmission distances up to 40km through a duplex LC interface. The module features low power consumption, hot-pluggable design, and integrated DOM functionality for enhanced network visibility and management.

FS Part Number	SFP1G-EX-31	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	<-23dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Hey, we're running a mixed environment with Cisco Catalyst and newer Arista switches. Will this transceiver trigger any "unsupported module" errors? By M***e on 2026-04-24

A: Hi there! No worries at all. The LS-SM311G-40C is 100% MSA compliant and we code it to be fully compatible with major OEMs including Cisco, Arista, Juniper, and HPE. You can plug and play without manual bypass commands. By admin on 2026-04-24
Q: Does the DOM feature on this module support standard SFF-8472? We need to pull laser bias and Tx/Rx optical power data into our monitoring software. By L***t on 2025-12-20

A: Yes, it does! The integrated Digital Optical Monitoring (DOM/DDM) fully complies with the SFF-8472 standard and IEEE 802.3ah-2004 protocols. Your NMS will seamlessly pull real-time diagnostics like temp, voltage, and Rx/Tx power levels straight from the transceiver. By admin on 2025-12-20
Q: I'm an IT admin planning a massive data center upgrade. If I need around 2,000 pieces of these 1.25G SFP modules, is there any bulk pricing available? By J***e on 2025-10-23

A: Absolutely! For large batch deployments, we offer tiered volume discounts. If you're ordering 1,000+ units, there will be a good price, and you can contact our sales team directly for specific net terms and additional project discounts! By admin on 2025-10-23

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S***r

Canada

Verified Purchase

5 .0

2026-03-02

Perfect SMF module for my home lab!

116 Helpful vote Comments

P***h

Switzerland

Verified Purchase

5 .0

2026-02-28

Solid duplex LC connectors, snapped right in.

239 Helpful vote Comments

C***z

Sweden

Verified Purchase

5 .0

2026-02-24

As a network engineer, I highly recommend the LS-SM311G-40C for data center mass deployment. The DOM integration via IEEE 802.3ah-2004 protocol provides crucial real-time monitoring for voltage and laser bias.

120 Helpful vote Comments

M***z

Saudi Arabia

Verified Purchase

5 .0

2026-02-15

Tested with D-Link and Netgear switches, no compatibility warnings and steady Gigabit speeds.

119 Helpful vote Comments

D***s

Belgium

Verified Purchase

5 .0

2026-01-15

Plug and play with our Ubiquiti gear (❁´◡`❁)

216 Helpful vote Comments

D***n

Mexico

Verified Purchase

5 .0

2025-12-07

Insane value for mass data center deployment!

60 Helpful vote Comments

E***n

Colombia

Verified Purchase

5 .0

2025-12-01

Using this 1.25G module alongside my home 10G NAS setup, absolutely stable throughput.

121 Helpful vote Comments

D***n

Brazil

Verified Purchase

5 .0

2025-08-28

I bought a batch for our outdoor networking enclosures. Even though it's a 0-70C commercial part, it survived our summer heatwave beautifully while passing campus optical networking traffic with zero CRC errors.

70 Helpful vote Comments

D***n

Austria

Verified Purchase

5 .0

2025-06-12

DOM feature works great on MikroTik switches.

134 Helpful vote Comments

N***n

Venezuela

Verified Purchase

5 .0

2025-06-01

Fast shipping, works perfectly with Cisco routers.

88 Helpful vote Comments

P***s

Argentina

Verified Purchase

4 .0

2025-03-22

Great 1310nm transceivers for our base station backhaul, delivery took a day longer than expected.

183 Helpful vote Comments

S***l

Chile

Verified Purchase

5 .0

2025-03-18

Deployed 50 of these LS-SM311G-40C for a school district, excellent OEM compatibility overall.

66 Helpful vote Comments

M***g

Sweden

Verified Purchase

5 .0

2025-03-14

Got these for outdoor cabinets; signal stays crisp over single-mode fiber despite the weather.

171 Helpful vote Comments

C***n

Belgium

Verified Purchase

5 .0

2025-03-13

We tested the TX/RX power levels using an optical meter, and this 1310nm transceiver is dead-on at -5dBm. Flawlessly bridges our remote base station backhaul over 35km of single-mode fiber.

233 Helpful vote Comments

S***s

Switzerland

Verified Purchase

5 .0

2024-10-31

The 40km transmission distance is legit, holding a solid link between two city buildings.

203 Helpful vote Comments

M***e

Singapore

Verified Purchase

5 .0

2024-07-23

The winter in my city is particularly cold, so I always worried about the temperature is too low for the ethernet module to work in, which might result in the paralysis of the entire computer room. However, the modules bought from l-p.com works fine in the low temperatures environment. Never need to worry about the temperature which could influence the ethernet module performance. l-p.com, good choice!

27 Helpful vote Comments

I***o

Philippines

Verified Purchase

5 .0

2024-05-10

Nice webpage layout & selection. Good customer service when I called about items. No pressure.

58 Helpful vote Comments

b***r

United States

Verified Purchase

5 .0

2024-03-24

Great product for the price. Can afford to have a spare for the price.

29 Helpful vote Comments

D***a

United States

Verified Purchase

5 .0

2024-02-24

Although spent a little time finding what I need, order came quickly and worked well.

88 Helpful vote Comments

W***s

Poland

Verified Purchase

5 .0

2023-12-20

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

23 Helpful vote Comments

J***n

Iran, Islamic Republic of

Verified Purchase

5 .0

2023-11-22

top , Fast shipping , works perfectly

16 Helpful vote Comments

G***d

India

Verified Purchase

5 .0

2023-10-16

can't wait to get it

40 Helpful vote Comments

A***r

Philippines

Verified Purchase

5 .0

2023-10-07

10/25/40G Transceiver Modules Female works well on my switches and I would get some more soon.

55 Helpful vote Comments

I***n

Mexico

Verified Purchase

5 .0

2023-10-02

The item works well with our systems and was easy to order and Fast delivery as promised.

27 Helpful vote Comments

S***i

United States

Verified Purchase

5 .0

2023-04-18

Great Company

60 Helpful vote Comments

M***s

United Arab Emirates

Verified Purchase

5 .0

2023-04-02

No complaints out of me... keep up the good work LINK-PP.

29 Helpful vote Comments

E***e

Belgium

Verified Purchase

5 .0

2023-02-17

The seller at l-p.com was wonderful to work with, the website is easy to use and made us comfortable choosing fiber modules online, and we would absolutely go again.

63 Helpful vote Comments

J***n

Israel

Verified Purchase

5 .0

2023-01-22

I have always had good experiences with LINK-PP team.

17 Helpful vote Comments

P***y

Democratic People's Republic of Korea

Verified Purchase

5 .0