What type of internal transmitter optical assembly is utilized in the SFP-25G-LR-S module?

The module incorporates a highly reliable Distributed Feedback (DFB) laser architecture, which maintains spectral stability across long distances under varying thermal loads.

Is the optical port interface compatible with standard APC angled physical connectors?

No, the interface is explicitly designed for Duplex LC/UPC (Ultra Physical Contact) flat connectors. Forcing an APC-angled fiber plug into it will cause high insertion loss.

Does the SFP-25G-LR-S use an NRZ or PAM4 modulation scheme for signaling?

This module utilizes standard non-return-to-zero (NRZ) modulation at a serial line rate of 25.78Gbps, ensuring low latency compared to PAM4 optics.

How does the 1.2W power envelope affect high-density Top-of-Rack (ToR) switch deployments?

Its ultra-lean 1.2W draw keeps the switch's overall thermal dissipation low, preventing port-throttling or cooling fans from ramping up to maximum velocity in fully populated 48-port switches.

Does the diagnostic engine comply with the SFF-8472 specification for real-time monitoring of supply voltage and laser bias?

Yes, the built-in DDM framework registers voltage, temperature, bias current, and optical power precisely according to SFF-8472 industry guidelines.

Can we hot-swap this module into a busy line card without disrupting neighboring 25G SFP28 links?

Yes, the module is fully engineered for hot-plugging, allowing clean physical installation without causing power spikes or interrupting adjacent data lanes.

Can this 1310nm single-mode transceiver connect to a 1550nm module on the opposite end of a dark fiber run?

No, both ends of the physical layer span must utilize matching 1310nm center wavelengths to successfully establish optical synchronization.

Does this 10km single-mode SFP module suffer from severe modal dispersion if routed through old legacy single-mode fiber runs?

No, because modal dispersion is primarily a characteristic of multimode infrastructure. When operating at a 1310nm wavelength over standard single-mode fiber, chromatic dispersion is minimal, though legacy fiber quality and patch panel degradation should still be verified to ensure proper attenuation margins.

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Cisco SFP-25G-LR-S Compatible LINK-PP 25G SFP28 1310nm 10km Duplex LC/UPC DOM SMF Optical Transceiver Module

Name: Cisco SFP-25G-LR-S Compatible LINK-PP 25G SFP28 1310nm 10km Duplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 219250
Price: 29.67 USD
Availability: InStock
Rating: 5 (25 reviews)

# 219250

Product: Cisco SFP-25G-LR-S Compatible LINK-PP 25G SFP28 1310nm 10km Duplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 219250
P/N: LS-SM3125-10C
Price: $ 34.5
Stock: 1338 in Stock
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Compatible:: Cisco; LINK-PP; AVAGO; Arista; Brocade; DELL; Edge-Core; Extreme; FS; H3C; HPE Aruba; HPE H3C; HW; Intel; Juniper; Mellanox; Ubiquiti

Compatible P/N:: SFP-25GLRL-31-I | 2km; SFP-10/25G-LR-I | 10km; SFP-10/25G-LR-S | 10km; SFP-25G-LR-I | 10km; SFP-25G-LR-S | 10km; SFP-25G-ER-S-I | 30km; SFP-25G-iER-S | 30km; SFP-25G-ER-I | 40km; SFP-25G-ER40-S | 40km

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Cisco SFP-25G-LR-S Compatible LINK-PP 25G SFP28 Specifications

SFP-25G-LR-S is a 25G SFP28 single-mode optical transceiver module that engineered for precision data delivery, sustaining an ultra-lean maximum power consumption of 1.2W while driving 1310nm wavelengths across distances up to 10km with integrated DOM diagnostics.

Cisco Part Number	SFP-25G-LR-S	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1310nm	Max Cable Distance	10km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
Receiver Sensitivity	-13dBm	Receiver Overload	2dBm
TX Power	-8 to +3dBm	RX Power	-14 to +3dBm
DOM	Supported	Protocols	MSA Compliant, CPRI, eCPRI

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Q: Does the diagnostic engine comply with the SFF-8472 specification for real-time monitoring of supply voltage and laser bias? By O***n on 2026-04-28

A: Yes, the built-in DDM framework registers voltage, temperature, bias current, and optical power precisely according to SFF-8472 industry guidelines. By admin on 2026-04-29
Q: Can we hot-swap this module into a busy line card without disrupting neighboring 25G SFP28 links? By E***e on 2026-03-15

A: Yes, the module is fully engineered for hot-plugging, allowing clean physical installation without causing power spikes or interrupting adjacent data lanes. By admin on 2026-03-16
Q: Can this 1310nm single-mode transceiver connect to a 1550nm module on the opposite end of a dark fiber run? By C***e on 2025-11-10

A: No, both ends of the physical layer span must utilize matching 1310nm center wavelengths to successfully establish optical synchronization. By admin on 2025-11-11
Q: Does this 10km single-mode SFP module suffer from severe modal dispersion if routed through old legacy single-mode fiber runs? By L***t on 2025-10-18

A: No, because modal dispersion is primarily a characteristic of multimode infrastructure. When operating at a 1310nm wavelength over standard single-mode fiber, chromatic dispersion is minimal, though legacy fiber quality and patch panel degradation should still be verified to ensure proper attenuation margins. By admin on 2025-10-19

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U***l

Belarus

Verified Purchase

5 .0

2026-05-27

Great option for 25G single-mode SFP optical transceivers. We use them for high-capacity uplinks between aggregation points in an air-conditioned colocation facility. SFF-8472 compliance is verified; digital diagnostics report accurate temperature levels.

35 Helpful vote Comments

B***l

United States

Verified Purchase

5 .0

2026-05-16

Accurate telemetry is crucial for our automated monitoring stack, and the DOM functions on these modules deliver exactly what we need. Rx/Tx power levels are stable and updating in real-time without glitching the system log.

35 Helpful vote Comments

Z***s

Malaysia

Verified Purchase

5 .0

2026-05-08

Robust physical assembly—the duplex LC/UPC connectors snap in snugly with absolute zero structural wobble.

34 Helpful vote Comments

W***s

Bulgaria

Verified Purchase

5 .0

2026-04-25

Linked up instantly with our edge switches; zero framing errors or alignment slips after a 48-hour soak test.

29 Helpful vote Comments

B***n

Germany

Verified Purchase

5 .0

2026-04-02

Lock-step synchronization at 25.78Gbps directly inside our high-density top-of-rack leaf-spine layout.

27 Helpful vote Comments

Y***n

United Arab Emirates

Verified Purchase

5 .0

2026-03-18

Using these for an enterprise network infrastructure refresh. The duplex LC connectors are well-molded, and the extraction latches feel sturdy enough for repeated patching during maintenance windows. No packet drops detected over a 72-hour stress test.

102 Helpful vote Comments

X***g

Austria

Verified Purchase

5 .0

2026-01-09

Campus Backbone Upgrade Success: We recently migrated our core campus distribution links from 10G to 25G SFP28 to support increased wireless access point density. These 1310nm 10km duplex LC optics were installed across four separate distribution closets. The fiber light launch mechanics are clean, keeping modal dispersion well within acceptable margins over our single-mode runs. Total power draw per module is minimal, keeping our PoE-heavy edge switches running within their thermal design envelopes. Highly recommend these for enterprise network infrastructure upgrades.

93 Helpful vote Comments

D***l

Australia

Verified Purchase

5 .0

2025-11-23

Negligible thermal signature inside the switch cage, staying well within commercial 0-70°C limits under load.

40 Helpful vote Comments

Z***t

United States

Verified Purchase

4 .0

2025-10-31

Pristine optical receiver sensitivity and clean eye patterns during field verification. The bail wire extraction latch is highly secure but feels a little stiff on the initial pull; you just need to exert a bit more even pressure to unlock it from the cage slot.

14 Helpful vote Comments

Y***n

South Africa

Verified Purchase

5 .0

2025-07-12

We utilize these commercial-grade 25G transceivers inside our temperature-controlled indoor cabinets at our regional aggregation points. Operating at 1310nm over single-mode fiber infrastructure, they maintain tight spectral widths. The duplex LC/UPC interface ensures minimal insertion loss upon connection. For anyone managing B2B e-commerce procurement for telco setups, these modules deliver the exact technical specifications required for high-reliability links without the inflated price tags of original branding.

98 Helpful vote Comments

V***s

Brunei Darussalam

Verified Purchase

5 .0

2025-06-03

Solid performance on our 25GbE optical transceiver deployment. We tested these over an 8km single-mode run across our corporate facility, and the received power remained comfortably within the recommended safety margins. No CRC errors.

62 Helpful vote Comments

l***x

Japan

Verified Purchase

5 .0

2024-05-24

Went to this site for a computer hard drive. Quickly found exactly what I wanted and for a great price. Was done in minutes.

35 Helpful vote Comments

J***n

United States

Verified Purchase

5 .0

2024-05-17

Not much to say. It works.

74 Helpful vote Comments

A***s

Poland

Verified Purchase

5 .0

2024-04-01

LINK-PP is a company with excellent sales people. They are technically oriented and know their products well. I have used them several times. Right product, on time, every time!

89 Helpful vote Comments

W***i

Argentina

Verified Purchase

5 .0

2024-03-27

The Website is good. I hope to see the product delivered in a reasonable time.

23 Helpful vote Comments

J***n

India

Verified Purchase

5 .0

2024-03-18

The shipment has arrived and I have to praise the packaging of the Optical Transceiver Module and especially the new 10/25/40G Transceiver Modules sealed boxes. Thx.

94 Helpful vote Comments

C***o

Israel

Verified Purchase

5 .0

2024-02-22

Good quality for a small price. I know that i buy more from this product.

35 Helpful vote Comments

G***y

Republic of Korea

Verified Purchase

5 .0

2023-11-09

Excellent quality compatible 10/25/40G Transceiver Modules ethernet modules, speedily delivered. We always use this supplier.

29 Helpful vote Comments

A***A

Romania

Verified Purchase

5 .0

2023-11-02

The 10/25/40G Transceiver Modules and service has been great, we have enjoyed good performance. Response at times is a little slow.

20 Helpful vote Comments

t***r

South Africa

Verified Purchase

5 .0

2023-10-08

It arrived in good order and was what I expected and ordered.

18 Helpful vote Comments

B***m

Poland

Verified Purchase

5 .0

2023-09-11

Great Price. Great Customer Service. Answered their phone promptly - shipped with great packaging. I would definitely shop here again.thank you!

29 Helpful vote Comments

K***n

Denmark

Verified Purchase

5 .0

2023-05-24

very responsive, competitive, and reliable.

12 Helpful vote Comments

M***m

Belgium

Verified Purchase

5 .0

2023-05-19

The experience with l-p.com was very good. The only complaint was that 10/25/40G Transceiver Modules was received a little late than I expected. Hope it would be Faster for my next purchase. Thank you.

40 Helpful vote Comments

M***o

Brazil

Verified Purchase

5 .0

2023-03-24

Arrived as advertised, installed it and away we went.

47 Helpful vote Comments

P***s

Canada

Verified Purchase

5 .0