What makes the SFP-25GER-31 special?

It is built for long distances. It lets you send massive 25Gbps data up to 40km away over a single pair of fiber cables.

Why does this module use a 1310nm wavelength?

The 1310nm light wavelength is perfect for single-mode fiber because it keeps the signal clear and strong over long distances.

What type of internal laser and receiver architecture does this module use?

The SFP-25GER-31 25G module integrates an Electro-absorption Modulated Laser (EML) transmitter and a highly sensitive Avalanche Photodiode (APD) receiver with a Transimpedance Amplifier (TIA) to ensure stable long-range signaling.

What is the typical power consumption of this long-range 25G SFP28 transceiver?

Due to the extended-reach EML and APD components, it typically consumes approximately 1.8W under standard operating conditions (3.3V supply).

Does this SFP28 module work for high-speed storage area networks running 32G Fibre Channel?

No, this is specifically tuned for 25G Ethernet and CPRI protocols, not for Fibre Channel environments.

What is the maximum guaranteed transmission distance for this SFP28 single-mode optics module?

The module safely supports links up to 40km (25GBASE-ER standard) over standard G.652 single-mode fiber, assuming normal splice and connector loss.

Will this module overheat if I populate 48 ports side-by-side in a high-density 1U switch?

No, this optical module uses an optimized low-power design (under 1.8W) to prevent heat buildup in dense switch layouts.

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Mellanox SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module

Name: Mellanox SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 214569
Price: 130.72 USD
Availability: InStock
Rating: 4.9 (15 reviews)

# 214569

Product: Mellanox SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 214569
P/N: LS-SM3125-40C
Price: $ 152
Stock: 929 in Stock
Sold: 396
Product URL: https://www.l-p.com/products/493980.htm

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Manufacture: LINK-PP

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Compatible:: Cisco; LINK-PP; Arista; Brocade; DELL; FS; H3C; HPE Aruba; Intel; Juniper; Mellanox; Netgear

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-25GER-31 Compatible LINK-PP 25G SFP28 Specifications

SFP-25GER-31 is a 25G SFP28 duplex LC/UPC optical transceiver engineered for long-haul single-mode fiber (SMF) transmissions, delivering pinpoint 1310nm wavelength signaling up to 40km with an optimized maximum power consumption of just 1.8W and integrated DOM capabilities.

Mellanox Part Number	SFP-25GER-31	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1310nm	Max Cable Distance	40km
Connector	Duplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	APD/TIA
Receiver Sensitivity	-19dBm	Operating Temperature range	0°C to +70°C
Protocols	MSA Compliant, CPRI, eCPRI	Warranty	5 Years

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Q: Does this SFP28 module work for high-speed storage area networks running 32G Fibre Channel? By J***r on 2026-02-15

A: No, this is specifically tuned for 25G Ethernet and CPRI protocols, not for Fibre Channel environments. By admin on 2026-02-15
Q: What is the maximum guaranteed transmission distance for this SFP28 single-mode optics module? By H***t on 2025-10-30

A: The module safely supports links up to 40km (25GBASE-ER standard) over standard G.652 single-mode fiber, assuming normal splice and connector loss. By admin on 2025-10-31
Q: Will this module overheat if I populate 48 ports side-by-side in a high-density 1U switch? By R***e on 2025-08-28

A: No, this optical module uses an optimized low-power design (under 1.8W) to prevent heat buildup in dense switch layouts. By admin on 2025-08-29

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L***g

Taiwan, Province of China

Verified Purchase

5 .0

2026-04-16

Enterprise-grade module at a fraction of OEM cost. Our IT procurement team was hesitant about third-party 40km ER optics, but these Link-PP SFP28 25G transceivers cleared all compliance checks. Low 1.8W power consumption keeps the rack temperature down.

144 Helpful vote Comments

S***s

France

Verified Purchase

5 .0

2026-04-01

Impressive 25G link budget. Deployed on a 30km single-mode fiber span with multiple splice points. Was worried about attenuation but the high-performance EML transmitter punched right through. Links have been up for 35 days straight.

130 Helpful vote Comments

U***y

Australia

Verified Purchase

5 .0

2026-03-16

We manage the IT infrastructure for a large automated warehouse facility where downtime is not allowed. We deployed these 25G SFP28 1310nm 40km modules to link our main server room to edge switches across the property. Even though these are commercial-grade (0-70°C), they are housed in outdoor enclosures and handle minor temperature shifts with no issues. The 25Gbps speed easily handles hundreds of HD security cameras and heavy data traffic at the same time. Very durable and great value.

125 Helpful vote Comments

O***y

United States

Verified Purchase

5 .0

2026-03-03

Clean engineering on the Duplex LC/UPC connector. Clicked right into place. Ran an extended optical spectrum test and there was absolutely zero packet loss or CRC anomalies. Excellent quality control from LINK-PP!

106 Helpful vote Comments

W***h

Ireland

Verified Purchase

5 .0

2026-02-09

We recently upgraded our data center inter-rack architecture to support 25G speeds. We needed reliable 25G SFP28 duplex LC optics to connect to our disaster recovery site 32km away. We ordered 50 pieces of this LINK-PP module. Every single unit worked out of the box with zero defects. They comply fully with standard SFF-8472 protocols, and our network management system tracks their DOM data perfectly. If you manage a large network and need long-range 25G throughput without the high OEM price, this is a top-tier choice.

142 Helpful vote Comments

P***y

Japan

Verified Purchase

5 .0

2026-01-23

Excellent thermal performance. Some 25G 40km SFP28 modules run super hot and degrade quickly, but the LS-SM3125-40C stays well within normal operating temperature limits even in high-density 48-port top-of-rack switches.

45 Helpful vote Comments

Y***t

Spain

Verified Purchase

4 .0

2026-01-16

These 25Gbps single-mode fiber modules perform exactly as advertised. Got full 25G throughput over our 35km link. The plastic pull-tab on the duplex LC connector is a little stiff on first use, making it slightly tricky to unlatch from our older, high-density patch panels. Works fine after a few insertions though!

17 Helpful vote Comments

T***e

Canada

Verified Purchase

5 .0

2025-12-22

Awesome supplier for networking gear. We buy networking components in bulk for the corporate campus network. These 25G SFP28 transceivers are our new standard for long-range intra-building links. Excellent build quality.

95 Helpful vote Comments

K***s

Lithuania

Verified Purchase

5 .0

2025-11-24

Rock solid DOM monitoring. Deployed these 25GBASE-ER modules for our regional ISP nodes. The built-in Digital Optical Monitoring (DOM) makes it easy to track real-time laser bias and temperatures via SNMP. Will buy more for next month's fiber rollout!

72 Helpful vote Comments

F***l

Philippines

Verified Purchase

5 .0

2025-08-26

No CRC errors at all. High-quality 25G SFP28 Duplex LC transceivers, highly recommended for data centers.

53 Helpful vote Comments

N***y

United States

Verified Purchase

5 .0

2025-08-15

Best cost-per-gigabit for 40km links. Buying OEM 25GBASE-ER modules would have blown our entire Q3 budget. These LINK-PP 25G SFP28 40km transceivers deliver identical performance for way less. Shipping to the US was fast, too.

61 Helpful vote Comments

Z***h

Russian Federation

Verified Purchase

4 .0

2025-08-11

These 25G SFP28 modules are fully MSA compliant, but on our older switches, the link light takes about 10 seconds to turn on after hot-plugging. Once the handshake finishes, the throughput is rock-solid with zero errors. Just be patient when you first plug them in!

21 Helpful vote Comments

R***l

United Kingdom

Verified Purchase

5 .0

2025-07-09

Perfect for Metro Ethernet rings. Deployed 30 of these SFP28 optical transceivers across our metro ring. The 25Gbps bandwidth handles our peak evening transit traffic with ease. CPRI protocol support is a nice bonus for future upgrades.

78 Helpful vote Comments

V***y

Republic of Korea

Verified Purchase

5 .0

2025-06-13

The Link-PP LS-SM3125-40C is a well-made 25G SFP28 module built for serious long-range single-mode fiber infrastructure. The 1310nm wavelength is ideal because it avoids the signal distortion issues you sometimes get on 1550nm channels at this distance. I tested these in a warm server room environment, and the internal laser kept the power output completely flat and stable. The duplex LC port is perfectly molded and doesn't stress the fiber tips. This is exactly the optical module we need.

88 Helpful vote Comments

I***n

Morocco

Verified Purchase

5 .0

2025-04-15

LINK-PP never disappoints. Our go-to vendor for reliable 25GBASE-ER network deployments.

111 Helpful vote Comments