What is the typical power consumption of the SFP-25GELR-31-I 25G module?

It consumes less than 1.2W, making it highly energy-efficient for high-density 25G network deployments.

The module works fine at room temperature, but will it perform reliably in an outdoor cabinet?

Yes, the industrial rating ensures stable operation from -40°C to +85°C, though ensure adequate airflow and avoid condensation on the optical interfaces.

Can I insert or remove the SFP-25GELR-31-I module while the switch is powered on?

It supports hot‑swapping, but always follow ESD precautions – ground yourself and handle the module by its edges to avoid static damage.

How do I access the real‑time optical power and temperature values from the module?

Use the switch’s DOM monitoring commands or SNMP queries; the module provides TX/RX power, bias current, voltage, and temperature.

Will this module sit correctly in a high-density 48-port SFP28 leaf switch without causing physical blocking or EMI issues?

Yes, the physical dimensions strictly adhere to the SFP28 MSA standard. The compact duplex LC housing ensures tight adjacent port isolation and prevents electromagnetic interference.

How does the 1310nm DFB laser maintain its frequency accuracy when exposed to heavy physical factory vibrations?

The internal optical assembly is structurally reinforced to dampen mechanical resonance, completely preventing laser wavelength shifting in heavy-industrial zones.

We have an existing single-mode fiber patch cord with a slightly degraded bend radius; will this 1310nm DFB laser cut through that extra attenuation?

While the module features a strong optical budget, heavy macro-bend losses can still degrade link stability over long distances. We highly recommend inspecting your fiber or replacing the patch cord if your DOM RX power readings drop below the -14dBm threshold.

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Mellanox SFP-25GELR-31-I Compatible LINK-PP 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)

Name: Mellanox SFP-25GELR-31-I Compatible LINK-PP 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 214110
Price: 35.054 USD
Availability: InStock
Rating: 5 (32 reviews)

# 214110

Product: Mellanox SFP-25GELR-31-I Compatible LINK-PP 25G SFP28 1310nm 20km Duplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)
SKU: 214110
P/N: LS-SM3125-20I
Price: $ 40.76
Stock: 621 in Stock
Sold: 734
Product URL: https://www.l-p.com/products/494071.htm

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Manufacture: LINK-PP

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Compatible:: LINK-PP; Arista; DELL; Intel; Juniper; Mellanox

Compatible P/N:: MMA2L20-AR | 10km; MMA2L20-AR-I | 10km; SFP-25GMLR-31 | 10km; SFP-25GELR-31-I | 20km; SFP-25GERL-31 | 30km; SFP-25GERL-31-I | 30km; SFP-25GER-31 | 40km; SFP-25GER-31-I | 40km

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Mellanox SFP-25GELR-31-I Compatible LINK-PP 25G SFP28 Specifications

SFP-25GELR-31-I is an industrial-grade 25G SFP28 optical transceiver module featuring a 1310nm DFB laser transmitter, a duplex LC/UPC connector, and integrated DOM support to achieve reliable data transmission over single-mode fiber up to 20km while maintaining a tight maximum power consumption of 1.2W.

Mellanox Part Number	SFP-25GELR-31-I	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	-40°C to +85°C	Extinction Ratio	3.5dB

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Q: Will this module sit correctly in a high-density 48-port SFP28 leaf switch without causing physical blocking or EMI issues? By R***d on 2026-01-26

A: Yes, the physical dimensions strictly adhere to the SFP28 MSA standard. The compact duplex LC housing ensures tight adjacent port isolation and prevents electromagnetic interference. By admin on 2026-01-27
Q: How does the 1310nm DFB laser maintain its frequency accuracy when exposed to heavy physical factory vibrations? By G***y on 2025-09-23

A: The internal optical assembly is structurally reinforced to dampen mechanical resonance, completely preventing laser wavelength shifting in heavy-industrial zones. By admin on 2025-09-24
Q: We have an existing single-mode fiber patch cord with a slightly degraded bend radius; will this 1310nm DFB laser cut through that extra attenuation? By I***s on 2025-07-06

A: While the module features a strong optical budget, heavy macro-bend losses can still degrade link stability over long distances. We highly recommend inspecting your fiber or replacing the patch cord if your DOM RX power readings drop below the -14dBm threshold. By admin on 2025-07-07

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H***e

Finland

Verified Purchase

5 .0

2026-03-22

Love how the SFF-8472 digital diagnostics report accurate real-time metrics. RX power sits beautifully right in the sweet spot over our 12km single-mode fiber patch. No attenuation pads needed.

30 Helpful vote Comments

A***e

Mexico

Verified Purchase

5 .0

2026-02-26

Best 25GBASE-LR alternative module. Incredible value for an industrial-grade DOM SMF transceiver.

11 Helpful vote Comments

L***k

United States

Verified Purchase

5 .0

2026-01-23

Deployed these in an unheated industrial enclosure up in Minnesota during a brutal winter freeze. The module started up immediately and maintained perfect optical wavelength stability.

32 Helpful vote Comments

S***g

Canada

Verified Purchase

4 .0

2026-01-08

Awesome price, but the pull-tab is a little stiff at first. These are easily the best value industrial 25GBASE-LR modules on the market right now. The only minor issue is that the pull-tab was a bit stiff to unlock the first time we tried to hot-swap them. It gets easier after a few tries.

27 Helpful vote Comments

N***w

Italy

Verified Purchase

5 .0

2025-11-02

Our municipal Metro-Ethernet ring upgrade suffered from sporadic link dropouts at 25G speeds due to chromatic dispersion on older fiber paths around the 20km limit. Switching our core optics to the LINK-PP 1310nm wavelength completely neutralized the dispersion curve anomalies we were experiencing with cheaper generic brands. The spectral width of their DFB laser is tightly controlled, delivering a razor-sharp signal over long SMF distances without needing expensive dispersion compensation modules (DCM).

121 Helpful vote Comments

G***e

Norway

Verified Purchase

5 .0

2025-09-29

Using these for a 25G high-frequency trading link setup. The PIN receiver sensitivity is awesome (<-14dBm), and the low-latency profile matches exactly what our stack requires. Highly recommended for enterprise core networks.

33 Helpful vote Comments

B***z

Republic of Korea

Verified Purchase

5 .0

2025-08-31

Duplex LC/UPC fits tightly. No loose connections, optical loss is practically non-existent.

24 Helpful vote Comments

K***s

Austria

Verified Purchase

5 .0

2025-08-17

Hooked up our main distribution frame to an aggregation switch across our warehouse complex. Speed is locked at a stable 25Gbps. LINK-PP has earned our trust for all future fiber rollouts.

29 Helpful vote Comments

Q***e

Bulgaria

Verified Purchase

5 .0

2025-07-28

Deploying 5G mobile fronthaul means dealing with dirty real-world fiber plants. Our regional deployment spanned a 16km single-mode fiber path that has at least four legacy fusion splices and two outdoor patch panels, introducing considerable insertion loss. Operating under strict eCPRI timing constraints, we were worried about signal degradation. However, the module's high-efficiency DFB laser punched straight through the attenuation. The optical power budget handled the losses comfortably, maintaining a rock-solid timing synchronization loop with zero frame slippage. For telecom field engineers, this hardware is bulletproof.

150 Helpful vote Comments

J***n

Belgium

Verified Purchase

5 .0

2025-06-14

Tested over a spooled 18km single-mode fiber line in our lab before field deployment. Zero frame loss during a 48-hour continuous stress test. Truly enterprise-grade engineering.

36 Helpful vote Comments

F***y

Sweden

Verified Purchase

5 .0

2025-04-14

Our field telecom crew deployed these for an eCPRI wireless backhaul link. The 1310nm DFB laser punches through the distance easily. Stable TX power (-1 to +7dBm) over a 15km run. Excellent hardware. ✨

63 Helpful vote Comments

M***s

Spain

Verified Purchase

5 .0

2025-04-05

Used these for upgrading frontline cell site routers. Fully compatible with our devices. Low power draw keeps the remote node thermal profile exactly where we need it.

48 Helpful vote Comments

Z***r

Brazil

Verified Purchase

5 .0

2025-03-15

Quick upgrade to 25G. Our server room migration went incredibly smoothly with these modules.

38 Helpful vote Comments

P***n

Romania

Verified Purchase

5 .0

2025-02-19

Port density on modern 25G leaf switches creates a nightmare for electromagnetic interference (EMI) and adjacent channel crosstalk. What sets this module apart is the structural isolation of its duplex LC/UPC interface. The physical alignment mechanism provides an incredibly tight optical coupling, which dramatically reduces back-reflection and near-end crosstalk (NEXT) when all 48 ports are packed continuously. The 1.2W low-power design also means we don't have localized thermal pockets cooking adjacent optical paths. Our Bit Error Rate (BER) testing returned a pristine 10⁻¹² score. Truly premium optical engineering.

117 Helpful vote Comments

I***l

Denmark

Verified Purchase

5 .0

2025-02-06

The mechanical latching mechanism feels premium. It gives a satisfying click when seating into the SFP28 cage, and the UPC finish keeps back-reflection incredibly low. Top marks.

43 Helpful vote Comments

A***n

Belgium

Verified Purchase

5 .0

2024-08-27

Work as described.

68 Helpful vote Comments

B***g

United States

Verified Purchase

5 .0

2024-05-13

Order came complete and in a timely manner.

48 Helpful vote Comments

D***r

Morocco

Verified Purchase

5 .0

2024-05-06

l-p.com provided excellent customer service for me. I would recommend the company.

16 Helpful vote Comments

C***n

Japan

Verified Purchase

5 .0

2024-04-26

Best supplier!

89 Helpful vote Comments

A***e

United Kingdom

Verified Purchase

5 .0

2024-03-02

These modules are awesome. They work prefectly. They are recognized right away with the speeds advertised. LINK-PP support has been great with all of our questions and helping us find the right modules for our needs. We will be using LINK-PP again the future for our Fiber needs. Thank you!

89 Helpful vote Comments

K***o

Russian Federation

Verified Purchase

5 .0

2023-12-06

It would be nice if you updated your inventory. Some items are not available any more. I had to chat to find out what was which went well.

41 Helpful vote Comments

D***g

Brunei Darussalam

Verified Purchase

5 .0

2023-10-29

I've always gotten a fair price. Thank you!

108 Helpful vote Comments

J***n

Philippines

Verified Purchase

5 .0

2023-10-23

Work well without any issues, and the quality is beyond what I expected!

28 Helpful vote Comments

N***p

United States

Verified Purchase

5 .0

2023-09-04

I am a very novice user. I just explained what hardware I have and that was it ! The team at l-p.com made sure I had the right part and everything arrrived via international shipping within the week. Very impressed and very happy. Everything just works. Thank You !

59 Helpful vote Comments

J***n

United States

Verified Purchase

5 .0

2023-07-26

Good pricing and Fast shipping. Very good website and easy to find products I was looking for.

102 Helpful vote Comments

M***a

Russian Federation

Verified Purchase

5 .0