Our switch chassis only supplies +3.3V on the SFP port. Will this module work without external power conversion?

Yes, it runs on a single +3.3V supply, so it’s fully compatible with standard 3.3V SFP slots — no extra power conversion needed.

Our procurement policy requires RoHS-compliant optics for all new deployments. Does this 1G SFP optical module meet that standard?

Yes, it’s fully RoHS compliant, so it fits green procurement rules for public sector and enterprise projects.

Does this SFP transceiver generate a lot of heat in dense 48-port panels? Concerned about thermal buildup in summer.

It’s low-power and stays cool under normal 1G loads. The industrial temp rating also gives extra headroom in dense, hot environments.

Our outdoor telecom cabinets can hit 70°C in summer and drop below -20°C in winter. Is this LS-MM851G-02I 1G SFP rated for that?

Yes, it’s an industrial-grade optical module with an operating case temperature range of -40°C to +85°C, perfect for harsh outdoor environments.

We’re connecting two buildings 1.6km apart over multi-mode fiber. Will this 850nm SFP module give us a stable 1G link without extra amplifiers?

Yes, the module is rated for up to 2km on 50/125µm multi-mode fiber, so 1.6km is well within its comfortable operating range at 1Gbps.

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LINK-PP LS-MM851G-02I 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-MM851G-02I 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 209259
Price: 9.46 USD
Availability: InStock
Rating: 4.9 (26 reviews)

# 209259

Product: LINK-PP LS-MM851G-02I 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module (Industrial)
SKU: 209259
P/N: LS-MM851G-02I
Price: $ 11
Stock: 85 in Stock
Sold: 915
Product URL: https://www.l-p.com/products/494817.htm

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Compatible P/N:: LS-MM851G-S5C | 550m; LS-MM851G-S5I | 550m; LS-MM311G-02AC | 2km; LS-MM311G-02AI | 2km; LS-MM311G-02C | 2km; LS-MM311G-02I | 2km; LS-MM851G-02C | 2km; LS-MM851G-02I | 2km

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LINK-PP LS-MM851G-02I 1G SFP Specifications

LS-MM851G-02I operates as an industrial-grade 1G SFP optical module that transmits at an 850nm wavelength across a 2km range via 50/125µm MMF, maintaining full compliance with SFP MSA and SFF-8472 protocols while enduring extreme temperatures from -40 to +85°C.

LINK-PP Part Number	LS-MM851G-02I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	850nm	Max Cable Distance	2km
Connector	Duplex LC	Media	MMF
Transmitter Type	VSCEL	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-20 to -1dBm
Receiver Sensitivity	-18dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant

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Q: Our switch chassis only supplies +3.3V on the SFP port. Will this module work without external power conversion? By B***d on 2026-03-10

A: Yes, it runs on a single +3.3V supply, so it’s fully compatible with standard 3.3V SFP slots — no extra power conversion needed. By admin on 2026-03-11
Q: Our procurement policy requires RoHS-compliant optics for all new deployments. Does this 1G SFP optical module meet that standard? By D***s on 2026-01-12

A: Yes, it’s fully RoHS compliant, so it fits green procurement rules for public sector and enterprise projects. By admin on 2026-01-13
Q: Does this SFP transceiver generate a lot of heat in dense 48-port panels? Concerned about thermal buildup in summer. By C***s on 2025-11-08

A: It’s low-power and stays cool under normal 1G loads. The industrial temp rating also gives extra headroom in dense, hot environments. By admin on 2025-11-09
Q: Our outdoor telecom cabinets can hit 70°C in summer and drop below -20°C in winter. Is this LS-MM851G-02I 1G SFP rated for that? By A***w on 2025-08-02

A: Yes, it’s an industrial-grade optical module with an operating case temperature range of -40°C to +85°C, perfect for harsh outdoor environments. By admin on 2025-08-03
Q: We’re connecting two buildings 1.6km apart over multi-mode fiber. Will this 850nm SFP module give us a stable 1G link without extra amplifiers? By E***r on 2025-05-28

A: Yes, the module is rated for up to 2km on 50/125µm multi-mode fiber, so 1.6km is well within its comfortable operating range at 1Gbps. By admin on 2025-05-29

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H***z

Republic of Korea

Verified Purchase

5 .0

2026-05-11

Bought these transceiver modules for a campus fiber upgrade. The 850nm multi-mode SFP paired perfectly with our existing OM1 cabling. DOM support makes troubleshooting way easier. No compatibility headaches so far!

98 Helpful vote Comments

H***s

New Zealand

Verified Purchase

5 .0

2026-05-02

We recently completed a campus network upgrade requiring extended-reach 1GbE links across detached manufacturing buildings. Standard 850nm optics usually top out around 550m over multi-mode fiber, but these industrial 1G SFP 850nm 2km optical transceivers allowed us to bridge the 1.4km gap using existing MMF cabling plant without pulling single-mode fiber. Upon inserting into our enterprise access switches, the port link came up instantly at 1.25 Gbps line rate. We ran stress tests for 72 hours, monitoring optical budget and thermal dissipation via DDM/DOM parameters. Receiver sensitivity stayed steady within spec limits, and optical transmit power showed zero degradation across high thermal load cycles. Extremely satisfied with hardware stability.

129 Helpful vote Comments

C***n

France

Verified Purchase

5 .0

2026-04-18

We’ve run these in both indoor racks and outdoor cabinets; the industrial temp rating really shows in the field.

45 Helpful vote Comments

E***n

Russian Federation

Verified Purchase

5 .0

2026-04-05

Deployed a batch of these industrial-grade 1G 850nm SFP modules across our sub-zero storage facilities. Operating temperature tolerance (-40°C to +85°C) is key for us. The duplex LC connectors feel sturdy and optical telemetry is spot on.

97 Helpful vote Comments

L***z

Sweden

Verified Purchase

5 .0

2026-03-21

We needed a reliable 1G multi-mode SFP transceiver for a small NAS setup over fiber. This 850nm SFP worked out of the box with our managed switch. The 2km reach is more than enough for our rack-to-rack links.

109 Helpful vote Comments

O***s

Spain

Verified Purchase

5 .0

2026-02-16

For anyone running 1G fiber in a campus or factory, this is a solid pick. The 850nm wavelength and DOM support make it easy to integrate into existing monitoring stacks.

90 Helpful vote Comments

A***n

United States

Verified Purchase

5 .0

2026-02-03

DOM telemetry is clean and readable in our monitoring dashboard, making life easier for remote troubleshooting.

64 Helpful vote Comments

E***a

Australia

Verified Purchase

5 .0

2026-01-27

Hot-plug swaps are smooth, and the module stays cool even after hours of continuous 1G traffic.

67 Helpful vote Comments

M***z

South Africa

Verified Purchase

5 .0

2026-01-09

We installed 20 units in a manufacturing plant with high ambient heat and dust, and another 10 in outdoor telecom cabinets exposed to direct sun and night-time cooling. The modules maintained stable 1.25Gbps links over 1.2–1.9km MMF runs. The DDM data helped us identify one bad patch cord (high loss) before it caused user impact. No thermal shutdowns or SFP alarms, even when cabinet temps hit ~70°C. The duplex LC receptacle locks securely, which matters in high-vibration areas. The single +3.3V supply and low power draw keep our DC power budgets predictable.

115 Helpful vote Comments

S***e

Singapore

Verified Purchase

5 .0

2025-12-18

These 850nm SFP modules are now our standard for 1G multi-mode fiber links. The 2km reach and industrial-grade temperature range cover most of our deployment scenarios. Easy to source and deploy in bulk.

105 Helpful vote Comments

G***s

Canada

Verified Purchase

5 .0

2025-12-04

DOM diagnostics read clean link levels on multi-mode fiber runs, zero dropped frames.

52 Helpful vote Comments

E***s

Belgium

Verified Purchase

4 .0

2025-11-28

Functionally, this is a solid 1G SFP with good DOM support and stable 2km links. The only downside was shipping time; it took about 3 days longer than the estimate. Once installed, though, it’s been rock solid.

34 Helpful vote Comments

A***h

Japan

Verified Purchase

5 .0

2025-11-18

Fired up this 1G SFP in our edge switch and the link was stable from the second one — no config tweaks needed.

59 Helpful vote Comments

A***e

Philippines

Verified Purchase

5 .0

2025-10-23

We rolled out these LS-MM851G-02I transceiver modules across a 12-building campus using multi-mode fiber. Each link spans 800m–1.8km at 1Gbps. All ports negotiated instantly with correct 1G Ethernet operation. Real-time DDM (TX/RX power, temperature, bias current) is accurate and maps cleanly into our SNMP monitoring stack. The -40°C to +85°C industrial case temperature rating is critical for our outdoor fiber distribution hubs. After 6 weeks of 24/7 traffic, we’ve had zero RMAs or link instability events. These are now our default for 1G MMF uplinks.

156 Helpful vote Comments

J***z

Mexico

Verified Purchase

5 .0

2025-10-08

Great value for a DOM-enabled multi-mode SFP. We use these for 1G uplinks between switches in different buildings. The module stays cool and reports accurate TX/RX power in our monitoring tools.

73 Helpful vote Comments

N***n

Netherlands

Verified Purchase

5 .0

2025-09-02

The build quality feels premium for the price. We’re using these 850nm SFP modules in an industrial environment with wide temp variations. So far, zero link flaps or SFP alarms after a month of 24/7 operation.

128 Helpful vote Comments

M***n

Indonesia

Verified Purchase

5 .0

2025-08-31

From a NOC perspective, these 1G multi-mode SFP modules are a joy. The Real Time Digital Diagnostic Monitoring data maps cleanly into our monitoring stack. We can set thresholds for RX power and temperature, and the alarms trigger correctly. We’ve used them in both indoor wiring closets and outdoor fiber termination points, thanks to the -40 to +85°C operating case temperature. The 2km MMF spec gives us headroom for future building additions without rewiring. The hot-pluggable SFP footprint makes field swaps quick and safe.

146 Helpful vote Comments

D***s

United Kingdom

Verified Purchase

5 .0

2025-08-09

Duplex LC connectors seat firmly in our patch panels, no loose connections even in high-vibration areas.

119 Helpful vote Comments

W***r

Italy

Verified Purchase

5 .0

2025-07-25

We replaced some aging SFP modules with these LINK-PP optical transceivers and saw immediate improvement in link stability. The duplex LC connector is a perfect fit for our patch panels.

62 Helpful vote Comments

I***z

India

Verified Purchase

5 .0

2025-06-30

Our IT team deployed 30+ units in a data hall. The duplex LC interface slides in cleanly, and the industrial temperature rating gives us confidence for edge locations. Link stability is excellent over 2km runs.

111 Helpful vote Comments

L***e

Malaysia

Verified Purchase

5 .0

2025-06-12

We replaced a mixed bag of legacy SFP modules with these LS-MM851G-02I transceivers across 3 sites. The consistent 1.25Gbps performance and full DDM support simplified our spares strategy. The 850nm wavelength aligns with our existing MMF infrastructure, so no need to re-terminate. The industrial temperature rating means we can use the same product for indoor and outdoor deployments, reducing inventory complexity. RoHS compliance was a must for our green procurement policy, and these modules check that box. The single +3.3V power supply integrates seamlessly with our existing switch power rails.

121 Helpful vote Comments

M***n

Norway

Verified Purchase

5 .0

2025-05-19

Ordered a batch for a base station backhaul project. These 1G SFP modules handle the temperature swings in our outdoor enclosures without issue. The DDM data helps us catch any fiber degradation early.

41 Helpful vote Comments

B***s

Germany

Verified Purchase

5 .0

2025-04-22

The 850nm wavelength pairs perfectly with our existing multi-mode fiber runs, zero compatibility headaches so far.

102 Helpful vote Comments

E***k

Austria

Verified Purchase

4 .0

2025-04-07

Transceiver hardware quality is superb, locked 1.25G link immediately over our 1.1km MMF run. Outer shipping carton arrived slightly compressed on one corner, though inner packaging protected all optical modules inside. Excellent product performance overall.

23 Helpful vote Comments

L***n

Thailand

Verified Purchase

5 .0

2025-02-28

Integrating these 850nm SFP optical modules into our high-speed local NAS links and core switches. Low-latency optical transmission with reliable link lock right upon insertion. Will reorder for upcoming expansion.

78 Helpful vote Comments

E***r

Brazil

Verified Purchase

5 .0

2025-01-15

Link margin looks solid on our 1.5km MMF spans, with no CRC errors or flaps during our stress tests.

103 Helpful vote Comments