Is this module strictly for standard Ethernet, or does it support telecom protocols like IEEE 802.3ah-2004 for base station backhaul?

It seamlessly handles both. It supports standard 1.25G Gigabit Ethernet and is fully compliant with IEEE 802.3ah-2004 protocols. It's a highly recommended solution for base station backhaul, secure network trunks, and regional fiber ring integrations.

We need to install these in outdoor cabinets out in the desert. Does it genuinely support 85°C without thermal throttling?

Yes. This is a true industrial-grade SFP transceiver rated for a -40°C to 85°C operating environment. The built-in DDM/DOM allows you to monitor the internal temperature in real-time, ensuring it won’t throttle or drop packets even in extreme unconditioned outdoor enclosures.

Just confirming before I order—does this require single-mode fiber, and what kind of patch cables do I need?

Correct. To achieve the 100km long-haul reach at the 1550nm wavelength, it requires Single-Mode Fiber (SMF). You'll just need standard Duplex LC fiber patch cables to plug into the optical interface.

Will this LS-SM551G-A0I throw any weird errors if I pop it into a mix of Cisco and Juniper switches in our DC?

No warnings at all. It's SFF-8472 MSA compliant and coded for seamless OEM compatibility. Our IT ops have run them on Cisco, Juniper, and Arista gear without a single compatibility hitch.

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LINK-PP LS-SM551G-A0I 1.25G SFP 1550nm 100km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-SM551G-A0I 1.25G SFP 1550nm 100km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 183364
Price: 27.761 USD
Availability: InStock
Rating: 5 (21 reviews)

# 183364

Product: LINK-PP LS-SM551G-A0I 1.25G SFP 1550nm 100km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 183364
P/N: LS-SM551G-A0I
Price: $ 32.28
Stock: 620 in Stock
Sold: 780
Product URL: https://www.l-p.com/products/478340.htm

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

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

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21 Reviews

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Manufacture: LINK-PP

P/N: LS-SM551G-A0I

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-SM551G-A0I 1.25G SFP Specifications

The LINK-PP LS-SM551G-A0I is a high-performance Small Form-factor Pluggable transceiver optimized for 1.25 Gbps Gigabit Ethernet deployments. This industrial-grade module incorporates a 1550nm DFB laser transmitter alongside a sensitive PIN photodiode receiver. It supports reliable data transmission over single-mode fiber infrastructure through a standard dual LC optical interface, maintaining seamless operational stability.

LINK-PP Part Number	LS-SM551G-A0I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm	Max Cable Distance	100km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	0 to +5dBm	RX Power	-30 to -1dBm
Receiver Sensitivity	-28dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Is this module strictly for standard Ethernet, or does it support telecom protocols like IEEE 802.3ah-2004 for base station backhaul? By M***s on 2026-05-14

A: It seamlessly handles both. It supports standard 1.25G Gigabit Ethernet and is fully compliant with IEEE 802.3ah-2004 protocols. It's a highly recommended solution for base station backhaul, secure network trunks, and regional fiber ring integrations. By admin on 2026-05-15
Q: We need to install these in outdoor cabinets out in the desert. Does it genuinely support 85°C without thermal throttling? By E***n on 2026-05-07

A: Yes. This is a true industrial-grade SFP transceiver rated for a -40°C to 85°C operating environment. The built-in DDM/DOM allows you to monitor the internal temperature in real-time, ensuring it won’t throttle or drop packets even in extreme unconditioned outdoor enclosures. By admin on 2026-05-07
Q: Just confirming before I order—does this require single-mode fiber, and what kind of patch cables do I need? By R***n on 2026-02-20

A: Correct. To achieve the 100km long-haul reach at the 1550nm wavelength, it requires Single-Mode Fiber (SMF). You'll just need standard Duplex LC fiber patch cables to plug into the optical interface. By admin on 2026-02-21
Q: Will this LS-SM551G-A0I throw any weird errors if I pop it into a mix of Cisco and Juniper switches in our DC? By J***r on 2026-01-04

A: No warnings at all. It's SFF-8472 MSA compliant and coded for seamless OEM compatibility. Our IT ops have run them on Cisco, Juniper, and Arista gear without a single compatibility hitch. By admin on 2026-01-04

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M***r

Venezuela

Verified Purchase

5 .0

2026-05-15

Reliable DOM monitoring on our multi-brand switches.

85 Helpful vote Comments

L***z

Argentina

Verified Purchase

5 .0

2026-04-18

Ideal IEEE 802.3ah-2004 optical transceiver for extreme environments. Integrated them into unconditioned traffic control enclosures. Even during summer heatwaves hitting 80°C internally, the DDM showed stable laser bias and zero thermal throttling.

170 Helpful vote Comments

S***z

Peru

Verified Purchase

5 .0

2026-02-10

Great industrial grade optical transceiver. DDM gives me real-time voltage and temperature data remotely.

81 Helpful vote Comments

C***a

France

Verified Purchase

5 .0

2025-12-07

SFF-8472 MSA compliant, booted right up instantly.

85 Helpful vote Comments

A***g

France

Verified Purchase

5 .0

2025-11-10

Deployed 50 of these LINK-PP LS-SM551G-A0I modules for a municipal fiber ring. The 1550nm 100km spec holds up perfectly over our 78km span with -25dBm receive power. Multi-brand compatibility is flawless.

128 Helpful vote Comments

C***s

Mexico

Verified Purchase

5 .0

2025-11-04

Perfect 1.25G SFP 100km range for outdoor cabinets! ⚡

52 Helpful vote Comments

W***s

Ireland

Verified Purchase

4 .0

2025-10-16

Took a day longer to UK, yet these duplex LC DOM transceivers are solidly built.

157 Helpful vote Comments

S***l

Brazil

Verified Purchase

5 .0

2025-10-09

As a network engineer, finding a true -40 to 85°C industrial SFP 1.25G transceiver supporting comprehensive DOM is rare at this price. Excellent Tx/Rx optical budget for remote outdoor cabinet backhaul. (ง'̀-'́)ง

194 Helpful vote Comments

M***n

Spain

Verified Purchase

5 .0

2025-09-14

Solid single-mode fiber connectivity, zero packet drop.

67 Helpful vote Comments

J***l

Netherlands

Verified Purchase

5 .0

2025-09-10

Great 1550nm DFB laser stability over 80km!

120 Helpful vote Comments

M***r

Costa Rica

Verified Purchase

5 .0

2025-08-18

Needed a rugged 1.25G SFP module for an outdoor cabinet. This handles 85°C effortlessly. ☀️

34 Helpful vote Comments

M***r

Poland

Verified Purchase

5 .0

2025-05-04

Upgraded our campus fiber network. The 100km reach on this SMF SFP is legit. ¯_(ツ)_/¯

31 Helpful vote Comments

P***s

Colombia

Verified Purchase

5 .0

2025-04-16

Installed this 1.25G transceiver in my home lab router. Duplex LC clicks in perfectly!

42 Helpful vote Comments

L***n

Dominican Republic

Verified Purchase

5 .0

2025-04-01

Cost-effective 1.25G SFP for our campus fiber network.

129 Helpful vote Comments

S***n

United States

Verified Purchase

5 .0

2025-03-19

Solid SFF-8472 compliant module. Good pricing for mass data center deployment and reliable performance.

134 Helpful vote Comments

S***r

Viet Nam

Verified Purchase

5 .0

2025-03-18

Flawless duplex LC connection for base station backhaul.

193 Helpful vote Comments

N***h

Switzerland

Verified Purchase

5 .0

2025-03-08

Replaced some dead optics at our base station. The PIN receiver sensitivity is fantastic.

115 Helpful vote Comments

P***s

Switzerland

Verified Purchase

5 .0

2025-02-15

We tested these LS-SM551G-A0I units on Juniper and Arista gear. 100% plug and play.

55 Helpful vote Comments

J***n

Spain

Verified Purchase

5 .0

2025-01-17

We ran intensive bit-error rate testing on this duplex LC DOM SMF transceiver for our enterprise campus. The DFB laser and PIN receiver combination delivered zero errors over a 90km link.

101 Helpful vote Comments

P***n

Portugal

Verified Purchase

5 .0

2025-01-08

Bought a batch for regional hubs. The 1550nm DFB transmitter maintains excellent signal integrity.

177 Helpful vote Comments

B***e

Denmark

Verified Purchase

5 .0