Just want to confirm before ordering—does this transceiver require OS2 single-mode fiber, and does it use a standard LC connector for a 160km run?

Spot on! This module is designed strictly for Single-Mode Fiber (SMF) like OS1/OS2 to achieve the massive 160km transmission distance using its 1550nm wavelength. It features a standard Duplex LC interface, making it universally compatible with standard LC-LC patch cords used in modern optical distribution frames.

Hello, we're planning to mix these SFP modules across Cisco Catalyst and Juniper switches in our datacenter. Will they be recognized without throwing unsupported transceiver errors?

Absolutely! This LS-SM551G-A6I module is fully SFF-8472 MSA compliant. Our network engineers have rigorously tested it for seamless OEM compatibility across major brands like Cisco, Juniper, and Ubiquiti, ensuring true plug-and-play operation without any third-party block errors.

We are looking to use these for a SCADA system telemetry upgrade. Are they fully compliant with Gigabit Ethernet and standard optical monitoring protocols?

Yes! The module complies with IEEE 802.3ah-2004 for 1.25Gbps Gigabit Ethernet, making it ideal for SCADA telemetry and remote substation backhaul. Additionally, it features built-in DOM/DDM (Digital Optical Monitoring), allowing your network management software to monitor real-time Rx/Tx power, temperature, and voltage via SNMP.

Our outdoor cabinets in the desert get extremely hot in summer and freezing at night. Can this module really handle those harsh temperature swings without dropping packets?

Yes, it's purpose-built for extreme environments! As an Industrial-grade transceiver, it operates flawlessly within a wide temperature range of -40°C to 85°C (-40°F to 185°F). Whether deployed in winter freezes or summer heatwaves, the industrial components guarantee stable 1.25Gbps transmission without overheating or signal degradation.

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LINK-PP LS-SM551G-A6I 1.25G SFP 1550nm 160km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-SM551G-A6I 1.25G SFP 1550nm 160km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 183379
Price: 35.26 USD
Availability: InStock
Rating: 5 (21 reviews)

# 183379

Product: LINK-PP LS-SM551G-A6I 1.25G SFP 1550nm 160km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 183379
P/N: LS-SM551G-A6I
Price: $ 41
Stock: 630 in Stock
Sold: 1.8K
Product URL: https://www.l-p.com/products/478355.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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21 Reviews

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Manufacture: LINK-PP

P/N: LS-SM551G-A6I

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-A6I 1.25G SFP Specifications

The LINK-PP LS-SM551G-A6I is a high-performance, cost-effective SFP optical transceiver designed for 1.25Gbps Gigabit Ethernet and Fiber Channel applications. Operating over a 1550nm wavelength, this industrial-grade module supports long-distance data transmission up to 160km via single-mode fiber, utilizing a duplex LC connector interface for reliable connectivity in extreme environments.

LINK-PP Part Number	LS-SM551G-A6I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm	Max Cable Distance	160km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	APD
TX Power	0 to +5dBm	RX Power	-30 to -1dBm
Receiver Sensitivity	-32dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Just want to confirm before ordering—does this transceiver require OS2 single-mode fiber, and does it use a standard LC connector for a 160km run? By J***s on 2026-05-29

A: Spot on! This module is designed strictly for Single-Mode Fiber (SMF) like OS1/OS2 to achieve the massive 160km transmission distance using its 1550nm wavelength. It features a standard Duplex LC interface, making it universally compatible with standard LC-LC patch cords used in modern optical distribution frames. By admin on 2026-05-29
Q: Hello, we're planning to mix these SFP modules across Cisco Catalyst and Juniper switches in our datacenter. Will they be recognized without throwing unsupported transceiver errors? By C***z on 2026-05-13

A: Absolutely! This LS-SM551G-A6I module is fully SFF-8472 MSA compliant. Our network engineers have rigorously tested it for seamless OEM compatibility across major brands like Cisco, Juniper, and Ubiquiti, ensuring true plug-and-play operation without any third-party block errors. By admin on 2026-05-13
Q: We are looking to use these for a SCADA system telemetry upgrade. Are they fully compliant with Gigabit Ethernet and standard optical monitoring protocols? By M***r on 2025-12-20

A: Yes! The module complies with IEEE 802.3ah-2004 for 1.25Gbps Gigabit Ethernet, making it ideal for SCADA telemetry and remote substation backhaul. Additionally, it features built-in DOM/DDM (Digital Optical Monitoring), allowing your network management software to monitor real-time Rx/Tx power, temperature, and voltage via SNMP. By admin on 2025-12-20
Q: Our outdoor cabinets in the desert get extremely hot in summer and freezing at night. Can this module really handle those harsh temperature swings without dropping packets? By P***a on 2025-07-31

A: Yes, it's purpose-built for extreme environments! As an Industrial-grade transceiver, it operates flawlessly within a wide temperature range of -40°C to 85°C (-40°F to 185°F). Whether deployed in winter freezes or summer heatwaves, the industrial components guarantee stable 1.25Gbps transmission without overheating or signal degradation. By admin on 2025-07-31

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E***z

Sweden

Verified Purchase

5 .0

2026-05-08

As a network engineer, I demand precise DOM diagnostics. This Gigabit SFP delivers exact Rx/Tx power readings. Sourced for our multi-brand switch compatibility test, and it linked up instantly.

33 Helpful vote Comments

D***l

Norway

Verified Purchase

5 .0

2026-04-24

Bulk ordered 50 units for a major regional fiber rollout. Every single 1550nm 160km transceiver passed our rigorous optical power tests. Outstanding cost-to-performance ratio for large-scale outdoor cabinet deployments.

107 Helpful vote Comments

C***z

Viet Nam

Verified Purchase

5 .0

2026-03-14

Replaced old modules with these 160km SFP transceivers. Massive improvement in wide-area industrial links.

196 Helpful vote Comments

M***g

Israel

Verified Purchase

5 .0

2026-02-06

Withstands our outdoor cabinet's brutal summer heat. ☀️

50 Helpful vote Comments

C***r

Dominican Republic

Verified Purchase

5 .0

2026-02-03

Outstanding -40°C performance in our winter deployments. ❄️

73 Helpful vote Comments

S***g

Italy

Verified Purchase

5 .0

2026-02-03

Excellent DOM support! Monitoring real-time temp and voltage on these industrial SFPs is easy.

134 Helpful vote Comments

M***r

Colombia

Verified Purchase

5 .0

2026-01-21

Upgraded our campus fiber network. This 1.25G SFP handles the 1550nm wavelength perfectly.

138 Helpful vote Comments

A***l

France

Verified Purchase

5 .0

2025-12-17

Seamless integration with our Cisco network setup.

185 Helpful vote Comments

C***s

Belgium

Verified Purchase

5 .0

2025-12-14

Works perfectly for our 160km SMF links.

192 Helpful vote Comments

N***l

Chile

Verified Purchase

4 .0

2025-10-14

Shipping took a day longer than expected, DOM parameters read perfectly though. ⏱️

162 Helpful vote Comments

A***l

Norway

Verified Purchase

5 .0

2025-10-11

Used for base station backhaul. Duplex LC interface fits our SMF cabling effortlessly.

187 Helpful vote Comments

K***t

Venezuela

Verified Purchase

5 .0

2025-10-07

Plug and play duplex LC, no issues.

149 Helpful vote Comments

B***e

Russian Federation

Verified Purchase

5 .0

2025-09-19

DDM reads accurately. Solid 1.25G industrial SFP.

63 Helpful vote Comments

B***t

Chile

Verified Purchase

5 .0

2025-06-18

Deployed in outdoor enclosures. The -40 to 85°C operating temperature rating is totally legit.

55 Helpful vote Comments

J***s

Hong Kong

Verified Purchase

5 .0

2025-05-18

Great MSA compatible transceiver for edge switches!

123 Helpful vote Comments

R***a

Finland

Verified Purchase

5 .0

2025-05-17

Solid SFF-8472 compliance. Recognized immediately by both our Juniper and Ubiquiti routing gear.

184 Helpful vote Comments

S***t

Argentina

Verified Purchase

5 .0

2025-05-06

Flawless Gigabit Ethernet SFP for fiber backhaul.

182 Helpful vote Comments

R***s

Ireland

Verified Purchase

5 .0

2025-04-28

Perfect 1550nm DFB laser for SCADA telemetry.

96 Helpful vote Comments

A***z

Norway

Verified Purchase

5 .0

2025-04-19

Cost-effective APD receiver SFP for long hauls.

159 Helpful vote Comments

M***r

Argentina

Verified Purchase

5 .0

2025-03-15

We run a massive SCADA telemetry network in extreme climates. These industrial SFPs survive -40°C freezes and 85°C heatwaves perfectly. The built-in DDM makes remote optical power monitoring an absolute breeze.

145 Helpful vote Comments

A***n

Switzerland

Verified Purchase

5 .0

2024-12-01

Tested these 1.25Gbps SFP modules on a demanding 150km SMF route. The APD receiver sensitivity is incredible at -32dBm. Flawless OEM compatibility with mixed-brand edge switches. Highly recommend for telecom backhaul!

78 Helpful vote Comments