We're an ISP looking to upgrade our base station backhaul. Any chance you offer B2B discounts for bulk purchasing 200 units?

We definitely support our B2B partners. For a volume order of 200 pieces, please contact our sales team via live chat or email. We'll set you up with a competitive bulk pricing tier.

Quick technical question: Does the DOM feature fully support SFF-8472 for remote Tx/Rx diagnostics?

Spot on! The module features full DDM/DOM support compliant with the SFF-8472 standard. This allows your network engineers to monitor real-time temperature, voltage, and Tx/Rx optical power directly from your switch CLI.

To hit that 120km transmission distance, what exact fiber type and connector setup do I need?

You will need standard Single-Mode Fiber (SMF), specifically OS1 or OS2 patch cables, terminated with Duplex LC connectors. Ensure your optical budget and splice losses are within the -28dBm receiver sensitivity limit!

Hi, just checking before I order. Do these 1G SFPs work with third-party switches like Ubiquiti or Cisco Catalyst?

Yes, absolutely! Our LS-SM551G-A2I transceivers are MSA compliant and strictly tested for wide OEM compatibility across major brands like Cisco, Ubiquiti, and Juniper. Plug and play!

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LINK-PP LS-SM551G-A2I 1G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-SM551G-A2I 1G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 183365
Price: 27.761 USD
Availability: InStock
Rating: 5 (24 reviews)

# 183365

Product: LINK-PP LS-SM551G-A2I 1G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 183365
P/N: LS-SM551G-A2I
Price: $ 32.28
Stock: 710 in Stock
Sold: 1.4K
Product URL: https://www.l-p.com/products/478341.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

24 Reviews

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$ 30.666

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$ 29.698

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$ 28.73

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Manufacture: LINK-PP

P/N: LS-SM551G-A2I

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-A2I 1G SFP Specifications

The LINK-PP LS-SM551G-A2I is a high-performance Gigabit SFP transceiver engineered for exceptional data reliability. Operating at 1.25Gbps, it supports long-haul single-mode fiber links. It runs on a stable 3.3V power supply with a maximum current consumption of 300mA, featuring a dual LC receptacle interface built fully to compliant SFP MSA standards.

LINK-PP Part Number	LS-SM551G-A2I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm	Max Cable Distance	120km
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	0 to 70°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: We're an ISP looking to upgrade our base station backhaul. Any chance you offer B2B discounts for bulk purchasing 200 units? By S***n on 2026-01-28

A: Hi there! We definitely support our B2B partners. For a volume order of 200 pieces, please contact our sales team via live chat or email. We'll set you up with a competitive bulk pricing tier. By admin on 2026-01-28
Q: Quick technical question: Does the DOM feature fully support SFF-8472 for remote Tx/Rx diagnostics? By D***n on 2025-10-17

A: Spot on! The module features full DDM/DOM support compliant with the SFF-8472 standard. This allows your network engineers to monitor real-time temperature, voltage, and Tx/Rx optical power directly from your switch CLI. By admin on 2025-10-17
Q: To hit that 120km transmission distance, what exact fiber type and connector setup do I need? By J***z on 2025-09-25

A: You will need standard Single-Mode Fiber (SMF), specifically OS1 or OS2 patch cables, terminated with Duplex LC connectors. Ensure your optical budget and splice losses are within the -28dBm receiver sensitivity limit! By admin on 2025-09-25
Q: Hi, just checking before I order. Do these 1G SFPs work with third-party switches like Ubiquiti or Cisco Catalyst? By N***r on 2025-08-20

A: Yes, absolutely! Our LS-SM551G-A2I transceivers are MSA compliant and strictly tested for wide OEM compatibility across major brands like Cisco, Ubiquiti, and Juniper. Plug and play! By admin on 2025-08-20

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B***t

Dominican Republic

Verified Purchase

5 .0

2026-05-01

Tested Rx sensitivity at -28dBm over a 110km dark fiber run. Impressive signal stability.

143 Helpful vote Comments

S***n

United States

Verified Purchase

5 .0

2026-04-24

As a network engineer, I demand strict MSA compliance. These 1550nm long-haul transceivers passed our core router validation instantly. The -30 to -1dBm RX range easily accommodated our complex base station backhaul architecture without attenuators.

60 Helpful vote Comments

C***n

Philippines

Verified Purchase

5 .0

2026-03-15

Plugged this single-mode SFP into a Juniper switch. Immediate link-up with zero CRC errors!

54 Helpful vote Comments

M***n

Ecuador

Verified Purchase

5 .0

2026-03-04

Deployed these 120km SFPs for cell tower backhaul. The DDM readings are extremely accurate.

172 Helpful vote Comments

S***s

France

Verified Purchase

5 .0

2026-02-26

1550nm DFB transmitter runs cool and stable.

164 Helpful vote Comments

T***z

New Zealand

Verified Purchase

5 .0

2026-02-20

Reliable 120km long-haul connection for base stations.

129 Helpful vote Comments

M***s

Poland

Verified Purchase

4 .0

2026-01-30

FedEx delayed my batch of 120km SFP modules for a day. Performance is solid though.

173 Helpful vote Comments

M***e

Poland

Verified Purchase

5 .0

2026-01-21

Perfect 1G SFP for our campus fiber network.

138 Helpful vote Comments

C***a

Denmark

Verified Purchase

5 .0

2025-12-22

Upgraded our server room interconnects with these Duplex LC modules. OEM compatibility is strictly spot-on.

39 Helpful vote Comments

T***n

Denmark

Verified Purchase

5 .0

2025-10-11

Solid industrial SFP module for outdoor cabinets. ❄️

49 Helpful vote Comments

R***n

Dominican Republic

Verified Purchase

5 .0

2025-08-16

1550nm SMF links synced up immediately. A+!

145 Helpful vote Comments

D***t

Switzerland

Verified Purchase

5 .0

2025-08-11

Used these SMF transceiver modules for a 100km run. Rock-solid performance and no packet loss.

58 Helpful vote Comments

J***e

Argentina

Verified Purchase

5 .0

2025-08-01

Installed a batch of these industrial 1G 1550nm SFPs in our outdoor telecom cabinets. Working seamlessly alongside major brand switches. The DDM/DOM feature gives precise real-time Tx/Rx power metrics. Highly recommend for enterprise ISP!

171 Helpful vote Comments

M***s

Czech Republic

Verified Purchase

5 .0

2025-07-14

Excellent long-reach optical transceiver for 120km SMF links. We use IEEE 802.3ah-2004 protocol for campus ring topologies. Link budgets hold perfectly with DFB lasers even after splicing. Great alternative to expensive name-brand OEM optics.

53 Helpful vote Comments

J***n

Ethiopia

Verified Purchase

5 .0

2025-07-06

Flawless DOM monitoring on our edge switches.

167 Helpful vote Comments

A***s

Netherlands

Verified Purchase

5 .0

2025-07-05

Fantastic bulk pricing for B2B procurement! The SFF-8472 DOM support makes remote network maintenance easy.

39 Helpful vote Comments

E***n

Pakistan

Verified Purchase

5 .0

2025-06-09

Top-notch 1.25G transmission distance and low latency.

167 Helpful vote Comments

D***l

Italy

Verified Purchase

5 .0

2025-05-11

The pluggable 1G optical transceiver module works perfectly. Nice addition to our network racks!

139 Helpful vote Comments

W***t

Czech Republic

Verified Purchase

5 .0

2025-05-10

Excellent 1.25Gbps transceiver for outdoor enclosures. Tolerates temperature shifts without any optical power drops.

45 Helpful vote Comments

K***n

Germany

Verified Purchase

5 .0

2025-04-26

Great duplex LC optical transceiver, fast shipping!

26 Helpful vote Comments

L***n

Japan

Verified Purchase

5 .0

2025-03-06

Cost-effective fiber optic SFP for enterprise NAS.

163 Helpful vote Comments

L***n

Russian Federation

Verified Purchase

5 .0

2025-02-28

MSA compliant module, plug and play!

36 Helpful vote Comments

J***r

Czech Republic

Verified Purchase

5 .0

2025-02-09

Works perfectly with our Cisco gigabit equipment.

42 Helpful vote Comments

A***n

Ukraine

Verified Purchase

5 .0

2024-12-17

Integrated this 1.25G SFP module into my home lab 10G/1G NAS setup using duplex LC patch cords. Absolutely zero Tx/Rx drops during heavy data replication. Runs super cool in a fanless switch enclosure. (^_^)

48 Helpful vote Comments