What type of fiber optic cable does this module require?

It requires a standard single-mode fiber (SMF) cable with duplex LC connectors.

What is the maximum transmission distance for this transceiver?

This optical module supports a maximum transmission distance of up to 2km.

Does the SFP1G-SX-31 support real-time diagnostic monitoring?

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

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

It supports up to 1.25Gbps for Gigabit Ethernet and Fiber Channel.

Aside from standard Gigabit Ethernet, can we use this SFP module for our Storage Area Network (SAN) upgrade?

Yes! Besides standard IEEE 802.3ah-2004 for Gigabit Ethernet, this module fully supports 1.063Gbps Fiber Channel protocols, making it a highly reliable and cost-effective solution for upgrading enterprise SANs and NAS storage environments.

We use a mix of Cisco Catalyst and Dell switches in our racks. Will this 1.25G SFP module work seamlessly across different brands?

Yes! The LS-SM311G-02C is fully SFF-8472 MSA compliant and features broad OEM compatibility. It has been strictly tested by our engineers to work perfectly with Cisco, Dell, Juniper, Arista, and other major switch brands without throwing any protocol errors.

We are planning to use these in an outdoor cabinet for a base station backhaul. Does this commercial 0-70°C version work, or do you have an industrial wide-temperature option?

For outdoor cabinets, we highly recommend our industrial version, the LS-SM311G-02I, which supports extreme temperatures from -40°C to 85°C. This commercial LS-SM311G-02C model (0 to 70°C) is specifically designed for indoor data centers, campus LANs, and enterprise server rooms.

To reach the maximum 2km transmission distance, what exact type of fiber optic patch cables should we purchase?

To achieve the full 2km link safely, you need standard Single-Mode Fiber (SMF) with Duplex LC connectors. Ensure your patch cables match the 1310nm wavelength and 9/125µm core size for optimal Tx/Rx optical power performance.

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FS SFP1G-SX-31 Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

Name: FS SFP1G-SX-31 Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 212633
Price: 4.73 USD
Availability: InStock
Rating: 5 (29 reviews)

# 212633

Product: FS SFP1G-SX-31 Compatible LINK-PP 1.25G SFP 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
SKU: 212633
P/N: LS-SM311G-02C
Price: $ 5.5
Stock: 1020 in Stock
Sold: 1.2K
Product URL: https://www.l-p.com/products/495150.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

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Manufacture: LINK-PP

P/N: LS-SM311G-02C

Compatible:: Cisco; LINK-PP; Adtran; Alcatel-Lucent; Allied Telesis; Arista; Avaya; Brocade; Calix; Ciena; D-Link; 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-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-SX-31 Compatible LINK-PP 1.25G SFP Specifications

The FS SFP1G-SX-31 Compatible LINK-PP module is a high-performance Small Form-factor Pluggable (SFP) transceiver module engineered for reliable 1.25Gbps data communications over single-mode fiber. This hot-pluggable module fully complies with SFP MSA and SFF-8472 industry specifications. Operating under a single +3.3V power supply, it features a stable 1310nm FP laser transmitter and integrated digital diagnostic monitoring functions.

FS Part Number	SFP1G-SX-31	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	0 to 70°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Aside from standard Gigabit Ethernet, can we use this SFP module for our Storage Area Network (SAN) upgrade? By D***z on 2026-05-09

A: Yes! Besides standard IEEE 802.3ah-2004 for Gigabit Ethernet, this module fully supports 1.063Gbps Fiber Channel protocols, making it a highly reliable and cost-effective solution for upgrading enterprise SANs and NAS storage environments. By admin on 2026-05-10
Q: We use a mix of Cisco Catalyst and Dell switches in our racks. Will this 1.25G SFP module work seamlessly across different brands? By C***t on 2026-01-30

A: Yes! The LS-SM311G-02C is fully SFF-8472 MSA compliant and features broad OEM compatibility. It has been strictly tested by our engineers to work perfectly with Cisco, Dell, Juniper, Arista, and other major switch brands without throwing any protocol errors. By admin on 2026-01-30
Q: We are planning to use these in an outdoor cabinet for a base station backhaul. Does this commercial 0-70°C version work, or do you have an industrial wide-temperature option? By J***n on 2025-12-29

A: For outdoor cabinets, we highly recommend our industrial version, the LS-SM311G-02I, which supports extreme temperatures from -40°C to 85°C. This commercial LS-SM311G-02C model (0 to 70°C) is specifically designed for indoor data centers, campus LANs, and enterprise server rooms. By admin on 2025-12-29
Q: To reach the maximum 2km transmission distance, what exact type of fiber optic patch cables should we purchase? By M***s on 2025-10-19

A: To achieve the full 2km link safely, you need standard Single-Mode Fiber (SMF) with Duplex LC connectors. Ensure your patch cables match the 1310nm wavelength and 9/125µm core size for optimal Tx/Rx optical power performance. By admin on 2025-10-19

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M***g

Chile

Verified Purchase

5 .0

2026-04-24

Upgraded our storage area networks with this 1.063Gbps Fiber Channel transceiver. Rock solid!

156 Helpful vote Comments

R***n

Russian Federation

Verified Purchase

5 .0

2026-04-13

Solid 1.25Gbps link over single-mode fiber.

256 Helpful vote Comments

M***g

United Kingdom

Verified Purchase

5 .0

2026-01-07

These duplex LC transceivers saved our budget. Great value for datacenter batch deployments!

85 Helpful vote Comments

M***z

Chile

Verified Purchase

5 .0

2025-12-10

Tested the 1310nm Tx/Rx on Arista and Dell. Multibrand OEM compatibility is perfect!

150 Helpful vote Comments

R***g

Bolivia

Verified Purchase

5 .0

2025-09-21

Great Cisco compatible SFP for homelab setups.

239 Helpful vote Comments

J***n

United States

Verified Purchase

5 .0

2025-09-05

Good optical transceiver power. LC connectors snap in tightly to our patch panels.

179 Helpful vote Comments

R***s

Saudi Arabia

Verified Purchase

5 .0

2025-08-15

Cost-effective gigabit fiber solution for batch deployments.

130 Helpful vote Comments

K***s

Poland

Verified Purchase

5 .0

2025-07-15

Very nice sales to speak to and knowledgeable on the products they sell!

95 Helpful vote Comments

J***e

Ireland

Verified Purchase

5 .0

2025-06-25

Great for extending our Homelab NAS over SMF. The commercial 0-70°C operating temperature is stable in our indoor rack. Very low power draw at 3.3V, highly recommend for B2B purchases.

209 Helpful vote Comments

J***k

France

Verified Purchase

5 .0

2025-05-15

Perfect duplex LC fit for Netgear switches.

79 Helpful vote Comments

A***t

Bolivia

Verified Purchase

5 .0

2025-04-17

SFF-8472 MSA compliant, works exactly as described.

134 Helpful vote Comments

R***s

Macao

Verified Purchase

5 .0

2025-03-26

Flawless 1310nm FP laser transmission performance!

152 Helpful vote Comments

C***a

Ireland

Verified Purchase

5 .0

2025-02-27

These Optical Transceiver Modules worked as advertised.

55 Helpful vote Comments

L***s

Austria

Verified Purchase

5 .0

2025-02-08

Pulled a 2km SMF run between buildings. Link came up instantly without drops.

259 Helpful vote Comments

P***k

Philippines

Verified Purchase

5 .0

2025-01-25

First order on this website. It is very easy to find what I need and place the orders, will see how Fast it ships and if the product is as advertised.

77 Helpful vote Comments

M***s

Ecuador

Verified Purchase

5 .0

2024-10-12

Plug and play 2km SMF LC transceiver!

124 Helpful vote Comments

B***k

Philippines

Verified Purchase

5 .0

2024-09-04

Satisfied with the Sfp Cage! Great service and good quality!

49 Helpful vote Comments

J***o

Mexico

Verified Purchase

5 .0

2024-05-18

I had a good experience with Link-PP. Hope to do more business in the future.

19 Helpful vote Comments

S***o

Netherlands

Verified Purchase

5 .0

2024-04-26

Very happy with everything! I will come again.

48 Helpful vote Comments

L***n

Russian Federation

Verified Purchase

5 .0

2024-02-28

Competitive pricing. Fast, easy, efficient and secure online shopping

71 Helpful vote Comments

V***i

Lithuania

Verified Purchase

5 .0

2024-01-16

The transaction and delivery went very Fast and precise.

54 Helpful vote Comments

R***e

Russian Federation

Verified Purchase

5 .0

2023-12-18

Supper Price Fast shipping Thank you

75 Helpful vote Comments

c***m

Finland

Verified Purchase

5 .0

2023-11-07

Orders are have always been correct every time I have ordered from here, which has been several times. High quality products and they are always in-stock. Website and check is streamlined perfectly.

65 Helpful vote Comments

K***s

United States

Verified Purchase

5 .0

2023-10-18

Outstanding service, very responsive, went above and beyond!

23 Helpful vote Comments

Y***g

Belarus

Verified Purchase

5 .0

2023-09-25

Workable!! We purchased from LINK-PP mainly due to the competitive price if compared to others. We will look for next purchase for our own support team and for our customers.

13 Helpful vote Comments

B***g

Brunei Darussalam

Verified Purchase

5 .0

2023-07-29

Easy to purchase from and received ordered product quickly.

50 Helpful vote Comments

D***s

New Zealand

Verified Purchase

5 .0