Is the LS-SM3125-20C 25G SFP28 module sensitive to static electricity?

Yes, always ground yourself and handle the module by its edges; keep it in the antistatic bag until installation.

What type of fiber optic cable should be used with the LS-SM3125-20C module?

Use standard 9/125μm single-mode fiber with LC connectors.

What causes signal loss during long-distance transmission?

Fiber attenuation, dirty connectors, or poor splicing can cause loss.

What should I do if the received power is too low?

Clean the LC connectors with a proper fiber cleaner, check for tight bends or splices in the fiber path, and ensure the fiber length does not exceed 20km.

Why did you choose the 1310nm wavelength for a 20km distance instead of 850nm?

850nm is for short-range multi-mode fiber. The 1310nm wavelength travels much further through single-mode fiber with very little signal loss, making 20km possible.

Is the outer pull-tab latch resilient enough for frequent hot-swapping in high-density 48-port top-of-rack switches?

Yes, the heavy-duty metal housing and reinforced pull-tab are engineered to withstand repeated mechanical insertions in tight, crowded rack environments.

Can I run this module near high-voltage power lines inside a factory without signal interference?

Yes! Because it uses single-mode fiber optic cable rather than copper, the signal is completely immune to EMI (Electromagnetic Interference) and radio noise.

Does the DOM telemetry feature provide accurate real-time internal temperature readings to prevent overheating?

Yes, the built-in Digital Optical Monitoring (DOM) tracks real-time internal operating temperature, voltage, and laser bias currents.

What is the typical power consumption per module under a full 25Gbps traffic load at 55°C ambient?

The power dissipation remains strictly below 1.2W, fully complying with SFP28 MSA guidelines to mitigate localized heat buildup.

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LINK-PP LS-SM3125-20C 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module

Name: LINK-PP LS-SM3125-20C 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 183256
Price: 33.334 USD
Availability: InStock
Rating: 5 (45 reviews)

# 183256

Product: LINK-PP LS-SM3125-20C 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 183256
P/N: LS-SM3125-20C
Price: $ 38.76
Stock: 720 in Stock
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Product URL: https://www.l-p.com/products/478238.htm

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Compatible P/N:: LS-SM3125-02C | 2km; LS-SM3125-02I | 2km; LS-SM3125-10C | 10km; LS-SM3125-10I | 10km; LS-SM3125E-10C | 10km; LS-SM3125E-10E | 10km; LS-SM3125E-10I | 10km; LS-SM3125-20C | 20km; LS-SM3125-20I | 20km; LS-SM3125-30C | 30km; LS-SM3125-30I | 30km; LS-SM3125-40C | 40km; LS-SM3125-40I | 40km

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LINK-PP LS-SM3125-20C 25G SFP28 Specifications

LS-SM3125-20C is a 25G SFP28 optical transceiver that pairs a 1310nm DFB laser with duplex LC/UPC interfaces, integrated DOM for real-time diagnostic tracking, and a 1.2W power envelope, all engineered to deliver reliable 20km reach over single-mode fiber under standard link budgets.

LINK-PP Part Number	LS-SM3125-20C	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1310nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
Receiver Sensitivity	-14dBm	Receiver Overload	2dBm
TX Power	-1 to +7dBm	RX Power	-15 to +3dBm
DOM	Supported	Protocols	MSA Compliant, CPRI, eCPRI
Operating Temperature Range	0 to 70°C	Extinction Ratio	3.5dB

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Q: Why did you choose the 1310nm wavelength for a 20km distance instead of 850nm? By U***s on 2026-03-14

A: 850nm is for short-range multi-mode fiber. The 1310nm wavelength travels much further through single-mode fiber with very little signal loss, making 20km possible. By admin on 2026-03-15
Q: Is the outer pull-tab latch resilient enough for frequent hot-swapping in high-density 48-port top-of-rack switches? By S***n on 2026-01-21

A: Yes, the heavy-duty metal housing and reinforced pull-tab are engineered to withstand repeated mechanical insertions in tight, crowded rack environments. By admin on 2026-01-22
Q: Can I run this module near high-voltage power lines inside a factory without signal interference? By V***e on 2025-10-13

A: Yes! Because it uses single-mode fiber optic cable rather than copper, the signal is completely immune to EMI (Electromagnetic Interference) and radio noise. By admin on 2025-10-14
Q: Does the DOM telemetry feature provide accurate real-time internal temperature readings to prevent overheating? By R***n on 2025-09-09

A: Yes, the built-in Digital Optical Monitoring (DOM) tracks real-time internal operating temperature, voltage, and laser bias currents. By admin on 2025-09-10
Q: What is the typical power consumption per module under a full 25Gbps traffic load at 55°C ambient? By T***h on 2025-07-24

A: The power dissipation remains strictly below 1.2W, fully complying with SFP28 MSA guidelines to mitigate localized heat buildup. By admin on 2025-07-25

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Y***d

Brunei Darussalam

Verified Purchase

5 .0

2026-04-28

Our engineering firm just finalized a network overhaul for a logistics hub. We utilized these 25G 1310nm 20km SMF modules for the primary uplink between the main admin building and the remote sorting facility. The fiber pathway is laid adjacent to high-voltage lines, so going optical with single-mode fiber was mandatory to avoid EMI. The transceivers have been running for 30 days straight. DOM data logs show completely flat lines for temperature and voltage, proving the internal components are premium grade.

85 Helpful vote Comments

I***l

Cambodia

Verified Purchase

5 .0

2026-04-14

Upgraded our storage area network (SAN) interconnects with these. The duplex LC connector has a nice, reassuring click when seating. If you need cheap but reliable 25G 20km SFP modules, this is it.

67 Helpful vote Comments

R***n

Bangladesh

Verified Purchase

5 .0

2026-04-09

Our network engineering team is quite picky about third-party transceivers, but these 25G 1310nm 20km modules passed all our stress tests. DOM metrics are very precise.

43 Helpful vote Comments

M***l

Nepal

Verified Purchase

5 .0

2026-03-25

Installed these 25G optical transceivers for our remote office backhaul. Total length is around 18km of dark fiber. Latency is minimal and the 25Gbps bandwidth is rock solid. Great job on the firmware coding.

154 Helpful vote Comments

E***n

Israel

Verified Purchase

5 .0

2026-03-12

Replaced some pricey OEM transceivers with these LS-SM3125-20C SFP28 modules for our enterprise core uplink. The DOM (Digital Optical Monitoring) readings perfectly match our original specs. Rx/Tx power levels are well within the safe threshold. High quality.

40 Helpful vote Comments

T***t

New Zealand

Verified Purchase

5 .0

2026-03-02

Smooth sailing from ordering to installation. The Duplex LC/UPC interface aligns perfectly with standard single-mode patch cables. Link aggregation is working fine at 25G.

97 Helpful vote Comments

K***m

Malaysia

Verified Purchase

5 .0

2026-02-25

Perfect for our 25G enterprise network upgrade. We did an extensive bit error rate (BER) test on a 12km SMF spool before deployment, and it came back flawless. Glad we chose these over overpriced tier-1 brands.

48 Helpful vote Comments

C***y

Belarus

Verified Purchase

5 .0

2026-02-19

Spot-on compatibility. 25G rate is stable. Thumbs up!

44 Helpful vote Comments

V***r

United States

Verified Purchase

5 .0

2026-02-05

Doing local GEO network expansion for a medical data center cluster in Ohio. We needed reliable 20km single-mode fiber transceivers capable of handling 25Gbps line rates for real-time imaging replication. These transceivers did not disappoint. The commercial operating temperature range (0°C to 70°C) is perfect for our climate-controlled hot/cold aisle setups. We’ve been pushing sustained 24Gbps throughput during off-peak database mirrors, and the optical link has remained rock solid without a single CRC error.

107 Helpful vote Comments

O***d

Canada

Verified Purchase

5 .0

2026-01-20

Solid build quality on the casing and pull-tab. The 1310nm single-mode optical transceiver spec is exactly what we needed for our long-haul campus interconnects. Solid 5 stars.

112 Helpful vote Comments

A***d

United States

Verified Purchase

4 .0

2026-01-14

Great 25G SFP28 modules. The DDM/DOM telemetry updates every few seconds on our dashboard, which is great. The bulk discount tier could be a bit more aggressive for mid-sized enterprise orders, but the retail price is already fair.

26 Helpful vote Comments

G***n

United States

Verified Purchase

5 .0

2026-01-07

Excellent 25G SFP28 SMF transceiver for municipal ISP rollouts. We deployed a batch of these in Austin, TX for local GEO fiber loops. The 1310nm wavelength holds up great over the rated distance.

53 Helpful vote Comments

S***r

Morocco

Verified Purchase

5 .0

2025-12-16

Using these in an indoor telecom closet with tight ventilation. They run surprisingly cool for 25G optics. No thermal throttling or link flapping. Highly recommend for enterprise deployment.

143 Helpful vote Comments

B***r

Denmark

Verified Purchase

5 .0

2025-11-22

Outstanding 25G 1310nm optics. Saved our IT budget a massive chunk this quarter.

59 Helpful vote Comments

F***e

Turkey

Verified Purchase

5 .0

2025-11-18

Using these for a 15km single-mode fiber (SMF) run between our main building and the warehouse distro switch. Registered full 25Gbps instantly on our Aggregation switches. Super clean signal over duplex LC.

102 Helpful vote Comments

W***g

Taiwan, Province of China

Verified Purchase

5 .0

2025-10-25

Outstanding product for telecom infrastructure contractors. We purchased a bulk order of these 25G SFP28 20km transceivers for an enterprise fiber-to-the-building (FTTB) contract. The duplex LC single-mode fiber setup made it easy to patch into existing fiber distribution boxes. Having onboard Digital Optical Monitoring (DOM) allowed our field techs to instantly verify Tx/Rx power levels during commission without needing external light meters. Truly a time-saver for high-density deployments.

120 Helpful vote Comments

N***h

Bulgaria

Verified Purchase

5 .0

2025-09-14

Shoutout to the support team for confirming vendor compatibility beforehand! These work flawlessly on our switches and routers. Real commercial-grade 25G SFP28 performance.

51 Helpful vote Comments

J***y

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2025-08-14

Running these optical transceivers in our indoor server room. DDM data is pulling perfectly via SNMP. Thermals are sitting steady around 40°C, well below the commercial operating temperature limit.

121 Helpful vote Comments

A***t

Poland

Verified Purchase

5 .0

2025-07-23

Solid 25G SFP28 optics. Best price-to-performance ratio for 1310nm 20km runs.

36 Helpful vote Comments

U***h

Lithuania

Verified Purchase

5 .0

2025-07-07

Deployed these 25G SFP28 1310nm modules for our high-frequency trading (HFT) local server room interconnects where jitter and packet loss must be absolute zero. The duplex LC/UPC connectors provide a rigid, low-loss physical connection. Our monitoring software tracking real-time DOM shows the laser bias current is completely stable. These modules strictly adhere to IEEE 802.3cc and SFF-8472 protocols, which makes them highly reliable for strict compliance environments. Will definitely add LINK-PP to our approved hardware list.

132 Helpful vote Comments

P***e

Philippines

Verified Purchase

5 .0

2025-06-11

Excellent option for upgrading 10G links to 25G SFP28. Didn't have to change any of our existing single-mode duplex LC fiber cabling infrastructure. Immediate ROI for our IT infrastructure team.

74 Helpful vote Comments

Z***t

Germany

Verified Purchase

4 .0

2025-05-27

Solid 25G 1310nm 20km performance, but the pull-tab latch color was slightly different from our existing inventory, which triggered my OCD. Performance-wise, they are flawless and DOM is reading accurately.

32 Helpful vote Comments

D***e

Germany

Verified Purchase

5 .0

2025-05-08

Fast shipping to Frankfurt, German tech team tested them—all green! ✨

26 Helpful vote Comments

H***e

United States

Verified Purchase

5 .0

2025-04-22

Our data center transit lines needed a serious bump from 10G to 25G. These 25G 1310nm 20km optics fit the budget perfectly. No issues with standard duplex LC/UPC patch cords. Delivery to Seattle was fast.

135 Helpful vote Comments

L***h

United States

Verified Purchase

5 .0

2025-03-21

Doing some local network infrastructure contracting in Boston, and the client requested 25G SFP28 optics for their multi-mode to single-mode migration. These 1310nm transceivers handled the 20km single-mode link flawlessly.

88 Helpful vote Comments

P***n

Denmark

Verified Purchase

5 .0

2024-08-19

I appreciated how Fast the process was and how great the 10/25/40G Transceiver Modules work with my switches.

26 Helpful vote Comments

L***c

Argentina

Verified Purchase

5 .0

2024-07-15

Every thing went smooth. I had a question and called, they helped me right away.

49 Helpful vote Comments

Y***a

Netherlands

Verified Purchase

5 .0

2024-07-12

So far so good, let's see if the delivery is as smooth.

28 Helpful vote Comments

D***o

Israel

Verified Purchase

5 .0

2024-03-06

Great price. Fast delivery. What more can I say.

78 Helpful vote Comments

g***o

New Zealand

Verified Purchase

5 .0

2024-02-06

Works perfect, recommended!

57 Helpful vote Comments

J***r

Spain

Verified Purchase

5 .0

2024-01-27

Will absolutely purchase from you soon. Pretty good.

24 Helpful vote Comments

H***r

United States

Verified Purchase

5 .0

2024-01-13

Great experience. I did an online chat to verify a question and they were clear and helpful and then I placed my order.

69 Helpful vote Comments

B***o

Italy

Verified Purchase

5 .0

2023-12-27

Received in 7 days, very good.

54 Helpful vote Comments

J***n

Israel

Verified Purchase

5 .0

2023-12-21

Another flawless transaction - got exactly what I ordered in a timely fashion!

49 Helpful vote Comments

S***n

Israel

Verified Purchase

5 .0

2023-11-12

Really poor customer service.

29 Helpful vote Comments

R***n

United States

Verified Purchase

5 .0

2023-10-10

I got exactly what I wanted and received them in a very timely manner. Satisfied

58 Helpful vote Comments

G***z

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2023-09-23

Order was correct and shipped out quickly, best price on the web. Cannot ask for more!

32 Helpful vote Comments

T***g

Ireland

Verified Purchase

5 .0

2023-09-06

The quality doesn't let me down! Highly recommend l-p.com.

39 Helpful vote Comments

S***r

Italy

Verified Purchase

5 .0

2023-08-09

Quick to provide a quote, easy to work with, and the product shipped promptly.

31 Helpful vote Comments

P***g

France

Verified Purchase

5 .0

2023-08-04

The shopping experience is amazing. The Account Manager is so nice and considerate. She helped a lot during the purchaing.Even after I placed my order, she contuined to send emails to inform me about the logistic.

51 Helpful vote Comments