Does this module require optical attenuators for shorter fiber runs?

While designed for 20km, the 1310nm laser's output power is generally safe for shorter links (e.g., 2km to 5km) without attenuators, but it is always recommended to check receive power levels via DOM to avoid receiver saturation on very short patch cables.

Can I connect this 20km module to a 10km module on the other end?

Yes, as long as both modules operate at 10Gbps over a 1310nm wavelength on Single-Mode Fiber, they will communicate, provided the total link distance does not exceed the lower module's optical budget (10km).

What type of fiber cable is compatible?

The TXM431-LR20 requires standard Single-Mode Fiber (SMF), typically 9/125um OS1 or OS2, terminated with a Duplex LC connector.

Is it compatible with my specific brand of switch?

The module is highly compatible with most standard networking equipment from brands like Cisco, Arista, and Juniper, thanks to its strict MSA standard programming.

I need to deploy these in an outdoor street cabinet. Can this module survive extreme temperatures, and do I need OS2 single-mode fiber for a 15km run?

This specific LS-SM3110-20C model is commercial temp (0°C to 70°C). For unconditioned outdoor cabinets, we highly recommend selecting our Industrial Temp version (-40°C to 85°C) for stable Tx/Rx performance. And yes, a 15km run requires Single-Mode Fiber (SMF) like OS1 or OS2 using a Duplex LC connector.

Hey guys, will these 10G SFP+ modules work with my older Cisco Catalyst switches and newer Arista gear? Also, do you offer any discount for bulk NOC deployment?

Yes! These transceivers are fully MSA compliant and rigorously tested for OEM compatibility, plugging seamlessly into Cisco, Arista, Juniper, and other major brands. We absolutely offer tiered B2B pricing for wholesale and batch deployments. Please reach out to our enterprise sales team for a custom quote.

Are these strictly for standard 10GBASE-LR Ethernet, or can they auto-negotiate and support CPRI/eCPRI protocols for our telecom tower setup?

These modules are incredibly versatile. In addition to standard 10G Ethernet, they natively support CPRI and eCPRI protocols. This makes them a perfect, low-latency choice for telecom base station backhaul, remote radio units (RRU), and enterprise switching alike.

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TP-Link TXM431-LR20 Compatible LINK-PP 10G SFP+ 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module

Name: TP-Link TXM431-LR20 Compatible LINK-PP 10G SFP+ 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 213483
Price: 27.52 USD
Availability: InStock
Rating: 4.9 (25 reviews)

# 213483

Product: TP-Link TXM431-LR20 Compatible LINK-PP 10G SFP+ 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module
SKU: 213483
P/N: LS-SM3110-20C
Price: $ 32
Stock: 1191 in Stock
Sold: 903
Product URL: https://www.l-p.com/products/493724.htm

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Compatible:: Cisco; LINK-PP; Allied Telesis; Arista; Brocade; Ciena; D-Link; Dell; Extreme; F5; Fortinet; Generic; HW; Intel; Juniper; Mellanox; MikroTik; Netgear; Palo Alto; TP-Link; Ubiquiti

Compatible P/N:: TXM431-LR20 | 20km

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TP-Link TXM431-LR20 Compatible LINK-PP 10G SFP+ Specifications

The TP-Link TXM431-LR20 Compatible LINK-PP module is an extended-reach 10Gbps SFP+ optical transceiver optimized for 20-kilometer links over Single-Mode Fiber. It utilizes a precision 1310nm DFB laser and a Duplex LC connector, complete with Digital Optical Monitoring to ensure high-performance data transport across wide-area networks.

TP-Link Part Number	TXM431-LR20	Vendor Name	LINK-PP
Part Status	Active	Form Factor	SFP+
Max Data Rate	10.7Gbps	Wavelength	1310nm
Max Cable Distance	20km	Connector	Duplex LC
Transmitter Type	DFB	Receiver Type	PIN
Media	SMF	Receiver Sensitivity	<-14.4dBm
TX Power	-6.5 to -0.5dBm	RX Power	-20 to -1dBm
Commercial Temperature Range	0 to 70°C	Protocols	IEEE 802.3ae, SFF-8472, SFF-8431, SFF-8432, SFP+ MSA Compliant, CPRI, eCPRI

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Q: I need to deploy these in an outdoor street cabinet. Can this module survive extreme temperatures, and do I need OS2 single-mode fiber for a 15km run? By P***z on 2026-03-02

A: This specific LS-SM3110-20C model is commercial temp (0°C to 70°C). For unconditioned outdoor cabinets, we highly recommend selecting our Industrial Temp version (-40°C to 85°C) for stable Tx/Rx performance. And yes, a 15km run requires Single-Mode Fiber (SMF) like OS1 or OS2 using a Duplex LC connector. By admin on 2026-03-02
Q: Hey guys, will these 10G SFP+ modules work with my older Cisco Catalyst switches and newer Arista gear? Also, do you offer any discount for bulk NOC deployment? By D***n on 2025-02-14

A: Yes! These transceivers are fully MSA compliant and rigorously tested for OEM compatibility, plugging seamlessly into Cisco, Arista, Juniper, and other major brands. We absolutely offer tiered B2B pricing for wholesale and batch deployments. Please reach out to our enterprise sales team for a custom quote. By admin on 2025-02-14
Q: Are these strictly for standard 10GBASE-LR Ethernet, or can they auto-negotiate and support CPRI/eCPRI protocols for our telecom tower setup? By C***n on 2024-11-01

A: These modules are incredibly versatile. In addition to standard 10G Ethernet, they natively support CPRI and eCPRI protocols. This makes them a perfect, low-latency choice for telecom base station backhaul, remote radio units (RRU), and enterprise switching alike. By admin on 2024-11-02

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D***z

Norway

Verified Purchase

4 .0

2026-05-30

Shipping delayed by a day. Still, great Cisco compatible 10G transceivers for the price.

181 Helpful vote Comments

M***z

Mexico

Verified Purchase

5 .0

2026-05-06

Cheap and reliable Cisco compatible module.

25 Helpful vote Comments

B***z

India

Verified Purchase

5 .0

2026-05-02

Upgraded our server room to 10G using these Duplex LC modules. Flawless OEM compatibility! (⌐■_■)

21 Helpful vote Comments

J***n

Argentina

Verified Purchase

4 .0

2026-04-20

Box arrived a bit crushed, but the 10G SMF modules work flawlessly in our switches.

146 Helpful vote Comments

S***t

Dominican Republic

Verified Purchase

5 .0

2026-04-13

Stable 1310nm wavelength, no signal drops.

161 Helpful vote Comments

J***s

Colombia

Verified Purchase

5 .0

2026-03-19

Plug and play Duplex LC optics!

138 Helpful vote Comments

L***n

Canada

Verified Purchase

5 .0

2026-02-05

Deployed a batch of these 1310nm 20km SFP+ optics for our campus fiber backbone. DDM readings are rock solid, and they synced instantly with Arista gear. Top-tier 10Gbps performance!

154 Helpful vote Comments

J***z

Hong Kong

Verified Purchase

5 .0

2025-10-10

Accurate DOM readings, highly recommend.

71 Helpful vote Comments

K***n

Czech Republic

Verified Purchase

5 .0

2025-10-02

Great value for bulk NOC deployment.

146 Helpful vote Comments

J***t

Austria

Verified Purchase

5 .0

2025-05-20

Reliable 1310nm optics. We use them for NOC cross-connects, and the DOM feature is accurate.

26 Helpful vote Comments

S***s

Ethiopia

Verified Purchase

5 .0

2025-04-09

Tested these in an outdoor cabinet for cell site backhaul. Tx/Rx light levels are optimal over a 15km SMF run using the eCPRI protocol. Definitely buying more for telecom upgrades.

22 Helpful vote Comments

S***s

Austria

Verified Purchase

5 .0

2025-02-26

Works perfectly in my Unifi switch!

34 Helpful vote Comments

L***a

Costa Rica

Verified Purchase

5 .0