Will this SFP module work with our older Cisco Catalyst and newer Arista switches without triggering any unsupported transceiver errors?

Absolutely. The LS-SM311G-40I is fully MSA compliant and extensively tested for 100% OEM compatibility with Cisco, Arista, and over 15 other major networking brands. No vendor lock-in warnings or CLI bypasses needed.

Can I use multimode fiber with this 1310nm 40km transceiver, or does it strictly require single-mode fiber (SMF)?

This specific module requires Single-Mode Fiber (SMF) to achieve the 40km transmission distance utilizing its 1310nm DFB laser. If your infrastructure relies on MMF, you will need to check out our 1000BASE-SX short-reach versions instead.

Does this 1.25G DFB transceiver support DOM/DDM and comply with IEEE 802.3ah-2004 for our telecom backhaul?

Definitely. It fully complies with IEEE 802.3ah-2004 and SFF-8472 protocols. The integrated Digital Optical Monitoring (DOM) allows your network engineers to track real-time receiver sensitivity, laser power, voltage, and internal temperature directly from your switch interface.

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H3C SFP1G-EX-31-I Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: H3C SFP1G-EX-31-I Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 224002
Price: 10.32 USD
Availability: InStock
Rating: 5 (27 reviews)

# 224002

Product: H3C SFP1G-EX-31-I Compatible LINK-PP 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 224002
P/N: LS-SM311G-40I
Price: $ 12
Stock: 789 in Stock
Sold: 718
Product URL: https://www.l-p.com/products/493795.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

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Manufacture: LINK-PP

P/N: LS-SM311G-40I

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

Compatible P/N:: SFP1G-SX-31 | 2km; SFP1G-SX-31-I | 2km; SFP-GE-LX-SM1310 | 10km; SFP1G-LX-31-I | 10km; SFP-GE-LX-SM1310-20 | 20km; JD062A | 40km; SFP-GE-LH40-SM1310 | 40km; SFP-GE-LH40-SM1550 | 40km; SFP1G-EX-31-I | 40km; JD063B | 80km; SFP-GE-LH70-SM1550 | 80km; SFP1G-ZX-55-I | 80km; JD103A | 100km; SFP-GE-LH100-SM1550 | 100km; SFP1G-ZX120-55 | 120km; SFP1G-ZX160-55 | 160km

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H3C SFP1G-EX-31-I Compatible LINK-PP 1.25G SFP Specifications

The H3C SFP1G-EX-31-I Compatible LINK-PP module is an industrial-grade 1.25G SFP transceiver engineered for optimal performance. Operating at a 1310nm wavelength over single-mode fiber, it supports transmission distances up to 40km. Featuring a duplex LC interface and full Digital Optical Monitoring, this hot-pluggable module operates reliably across a wide temperature range from -40°C to 85°C.

H3C Part Number	SFP1G-EX-31-I	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	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Will this SFP module work with our older Cisco Catalyst and newer Arista switches without triggering any unsupported transceiver errors? By J***s on 2026-04-08

A: Absolutely. The LS-SM311G-40I is fully MSA compliant and extensively tested for 100% OEM compatibility with Cisco, Arista, and over 15 other major networking brands. No vendor lock-in warnings or CLI bypasses needed. By admin on 2026-04-08
Q: Can I use multimode fiber with this 1310nm 40km transceiver, or does it strictly require single-mode fiber (SMF)? By R***k on 2026-03-14

A: This specific module requires Single-Mode Fiber (SMF) to achieve the 40km transmission distance utilizing its 1310nm DFB laser. If your infrastructure relies on MMF, you will need to check out our 1000BASE-SX short-reach versions instead. By admin on 2026-03-14
Q: Does this 1.25G DFB transceiver support DOM/DDM and comply with IEEE 802.3ah-2004 for our telecom backhaul? By D***r on 2026-03-05

A: Definitely. It fully complies with IEEE 802.3ah-2004 and SFF-8472 protocols. The integrated Digital Optical Monitoring (DOM) allows your network engineers to track real-time receiver sensitivity, laser power, voltage, and internal temperature directly from your switch interface. By admin on 2026-03-05

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M***e

Denmark

Verified Purchase

5 .0

2026-05-29

Using this 40km optical transceiver for a remote telecom base station backhaul. Plugged it into a Ciena router and the link came up instantly. Superb receiver sensitivity ensures stable long-haul Gigabit connectivity.

24 Helpful vote Comments

M***z

Costa Rica

Verified Purchase

5 .0

2026-03-31

Reliable 1.25G SFP 1310nm module. Good for long haul single-mode fiber links up to 40km.

61 Helpful vote Comments

M***t

Sweden

Verified Purchase

4 .0

2026-01-25

Box was slightly crushed on arrival, but the 1.25G industrial SFP works perfectly.

189 Helpful vote Comments

J***z

United States

Verified Purchase

5 .0

2026-01-02

Used these for a 38km base station backhaul. The DFB laser holds up great.

171 Helpful vote Comments

D***k

Netherlands

Verified Purchase

5 .0

2025-09-20

Cheap and reliable 1.25G fiber optic transceiver.

175 Helpful vote Comments

S***r

India

Verified Purchase

5 .0

2025-07-15

Bought a batch for traffic control outdoor cabinets. Extreme temps don't bother these modules.

162 Helpful vote Comments

D***z

Malaysia

Verified Purchase

5 .0

2025-07-12

Needed a reliable MSA compliant transceiver for an outdoor IP camera mesh. This industrial wide-temp SFP handles freezing nights perfectly. It synced with our mixed Alcatel environment without vendor lock-in complaints. Brilliant hardware. ❄️

160 Helpful vote Comments

A***n

Macao

Verified Purchase

5 .0

2025-07-09

Works perfectly in my home lab router.

195 Helpful vote Comments

J***s

Poland

Verified Purchase

5 .0

2025-07-03

Solid 40km transmission distance, zero drops.

82 Helpful vote Comments

R***n

Viet Nam

Verified Purchase

5 .0

2025-07-01

DOM support works flawlessly on Juniper switches.

26 Helpful vote Comments

C***a

Panama

Verified Purchase

5 .0

2025-06-27

Plug and play duplex LC SMF module.

39 Helpful vote Comments

M***n

Brazil

Verified Purchase

5 .0

2025-03-22

Much cheaper than original Cisco 1G SFPs but performs exactly the same in production.

175 Helpful vote Comments

A***g

Kenya

Verified Purchase

5 .0

2025-02-26

Deployed 50 of these LS-SM311G-40I modules across a massive campus fiber ring. OEM compatibility with Brocade and Extreme switches is 100% spot on. Real-time DOM monitoring is a lifesaver for our ops!

199 Helpful vote Comments

R***n

Bolivia

Verified Purchase

5 .0

2025-02-14

Stable 1310nm wavelength connection over 35km link.

105 Helpful vote Comments

M***n

Belgium

Verified Purchase

5 .0