Our outdoor enclosures get insanely hot in the summer and freezing in winter. Can this module survive that?

Definitely. This is a true industrial-grade optical transceiver built for harsh environments. It guarantees stable, zero-packet-loss operation across extreme temperature ranges from -40°C to 85°C (-40°F to 185°F).

Does this transceiver support DOM/DDM monitoring and meet standard Ethernet protocols?

Yes. It fully supports Digital Optical Monitoring (DOM/DDM) for real-time tracking of parameters like temperature, voltage, and optical laser power. It is also fully compliant with IEEE Fast Ethernet, Gigabit Ethernet, and 1G Fibre Channel standards.

We're looking to deploy about 500 of these for a city-wide ISP rollout. Do you guys offer volume discounts?

Yes, we provide tiered B2B bulk pricing. For a batch order of 500 units, the price drops significantly compared to the standard retail rate. Please contact our sales team directly to get a formal quote for your project.

Will this 1G BiDi SFP play nice with my Cisco Catalyst and Arista switches? I need to mix and match.

Absolutely! This module is 100% MSA compliant and extensively tested for OEM compatibility across major networking brands like Cisco, Arista, and Juniper. You can mix and match seamlessly without any vendor lock-in issues.

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LINK-PP LS-BL31491G-20I 1G SFP BiDi 1310nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-BL31491G-20I 1G SFP BiDi 1310nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 183541
Price: 7.56 USD
Availability: InStock
Rating: 4.9 (25 reviews)

# 183541

Product: LINK-PP LS-BL31491G-20I 1G SFP BiDi 1310nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 183541
P/N: LS-BL31491G-20I
Price: $ 8.79
Stock: 1200 in Stock
Sold: 800
Product URL: https://www.l-p.com/products/478511.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

25 Reviews

4 Questions

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800 Sold

$ 8.79

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$ 8.351

1000

$ 8.087

3000

$ 7.824

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$ 7.56

Manufacture: LINK-PP

P/N: LS-BL31491G-20I

Compatible:: LINK-PP

Compatible P/N:: LS-BL31551G-02C | 2km; LS-BL55311G-02C | 2km; LS-BL31551G-03C | 3km; LS-BL31551G-03I | 3km; LS-BL55311G-03C | 3km; LS-BL55311G-03I | 3km; LS-BL31491G-10C | 10km; LS-BL31491G-10I | 10km; LS-BL31551G-10C | 10km; LS-BL31551G-10I | 10km; LS-BL31551GE-10C | 10km; LS-BL49311G-10C | 10km; LS-BL49311G-10I | 10km; LS-BL49551G-10C | 10km; LS-BL49551G-10I | 10km; LS-BL55311G-10C | 10km; LS-BL55311G-10I | 10km; LS-BL55311GE-10C | 10km; LS-BL55491G-10C | 10km; LS-BL55491G-10I | 10km; LS-BL31551G-15C | 15km; LS-BL31491G-20C | 20km; LS-BL31491G-20I | 20km; LS-BL31551G-20C | 20km; LS-BL31551G-20I | 20km; LS-BL49311G-20C | 20km; LS-BL49311G-20I | 20km; LS-BL49551G-20C | 20km; LS-BL55311G-20C | 20km; LS-BL55311G-20I | 20km; LS-BL55491G-20C | 20km; LS-BL31491G-40C | 40km; LS-BL31491G-40I | 40km; LS-BL31551G-40C | 40km; LS-BL31551G-40I | 40km; LS-BL49311G-40C | 40km; LS-BL49311G-40I | 40km; LS-BL55311G-40C | 40km; LS-BL55311G-40I | 40km; LS-BL31551G-60C | 60km; LS-BL31551G-60I | 60km; LS-BL49551G-60C | 60km; LS-BL55311G-60C | 60km; LS-BL55311G-60I | 60km; LS-BL55491G-60C | 60km; LS-BL27331G-80C | 80km; LS-BL33271G-80C | 80km; LS-BL49551G-80C | 80km; LS-BL49551G-80I | 80km; LS-BL55491G-80C | 80km; LS-BL55491G-80I | 80km; LS-BL49551G-A0C | 100km; LS-BL49551G-A0I | 100km; LS-BL55491G-A0C | 100km; LS-BL55491G-A0I | 100km; LS-BL49551G-A2C | 120km; LS-BL49551G-A2I | 120km; LS-BL55491G-A2C | 120km; LS-BL55491G-A2I | 120km; LS-BL49551G-A5C | 150km; LS-BL49551G-A5I | 150km; LS-BL55491G-A5C | 150km; LS-BL55491G-A5I | 150km; LS-BL49551G-A6C | 160km; LS-BL49551G-A6I | 160km; LS-BL55491G-A6C | 160km; LS-BL55491G-A6I | 160km

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LINK-PP LS-BL31491G-20I 1G BiDi SFP Specifications

The LINK-PP LS-BL31491G-20I 1G BiDi SFP is a high-performance industrial grade optical module designed specifically for demanding environments. This robust 1G BiDi SFP transceiver delivers reliable gigabit connectivity, operating flawlessly between extreme temperatures of -40°C and 85°C. Engineered for seamless fiber optic communications, this LINK-PP transceiver ensures exceptional network stability and efficiency.

LINK-PP Part Number	LS-BL31491G-20I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm-TX/1490nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-23dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: Our outdoor enclosures get insanely hot in the summer and freezing in winter. Can this module survive that? By B***t on 2026-03-28

A: Definitely. This is a true industrial-grade optical transceiver built for harsh environments. It guarantees stable, zero-packet-loss operation across extreme temperature ranges from -40°C to 85°C (-40°F to 185°F). By admin on 2026-03-28
Q: Does this transceiver support DOM/DDM monitoring and meet standard Ethernet protocols? By R***s on 2025-11-27

A: Yes. It fully supports Digital Optical Monitoring (DOM/DDM) for real-time tracking of parameters like temperature, voltage, and optical laser power. It is also fully compliant with IEEE Fast Ethernet, Gigabit Ethernet, and 1G Fibre Channel standards. By admin on 2025-11-27
Q: We're looking to deploy about 500 of these for a city-wide ISP rollout. Do you guys offer volume discounts? By R***s on 2025-10-28

A: Yes, we provide tiered B2B bulk pricing. For a batch order of 500 units, the price drops significantly compared to the standard retail rate. Please contact our sales team directly to get a formal quote for your project. By admin on 2025-10-28
Q: Will this 1G BiDi SFP play nice with my Cisco Catalyst and Arista switches? I need to mix and match. By L***z on 2025-07-30

A: Absolutely! This module is 100% MSA compliant and extensively tested for OEM compatibility across major networking brands like Cisco, Arista, and Juniper. You can mix and match seamlessly without any vendor lock-in issues. By admin on 2025-07-30

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D***z

Denmark

Verified Purchase

5 .0

2026-05-18

Great cost-efficiency! Using these 1G LC DOM SMF modules for enterprise network edge switches.

75 Helpful vote Comments

D***s

Colombia

Verified Purchase

5 .0

2026-03-26

Upgraded our manufacturing plant's network using these LC simplex SFP modules. The industrial-grade tolerance is no joke—survives high heat easily. Great OEM compatible optics for anyone needing resilient Fast Ethernet connections.

203 Helpful vote Comments

L***z

Norway

Verified Purchase

5 .0

2026-03-15

Bulk deployed these LINK-PP LS-BL31491G-20I modules across our campus fiber network. The 1310/1490nm BiDi setup halved our fiber strand usage! Excellent DOM monitoring and totally MSA compliant. Total game changer for TCO.

30 Helpful vote Comments

S***z

Mexico

Verified Purchase

5 .0

2026-03-01

Linked up instantly on my home NAS.

133 Helpful vote Comments

E***k

Chile

Verified Purchase

4 .0

2026-02-16

FedEx delayed my batch by two days. Industrial optical transceivers perform great otherwise.

72 Helpful vote Comments

R***z

Denmark

Verified Purchase

5 .0

2026-01-27

Tested at -30°C, zero packet loss. ❄️

197 Helpful vote Comments

D***k

Peru

Verified Purchase

5 .0

2025-12-29

Cheap and reliable LC simplex transceiver.

113 Helpful vote Comments

L***l

France

Verified Purchase

5 .0

2025-12-14

Reliable industrial optical transceiver for harsh outdoor edge deployments. Highly recommend for B2B procurement.

19 Helpful vote Comments

D***z

Dominican Republic

Verified Purchase

5 .0

2025-11-26

Verified interoperability with Juniper and Arista gear in our datacenter. The 20km 1G SMF transceiver delivers stellar optical power margins. Perfect for gigabit fiber channel bridging and enterprise switch uplinks. Very reliable.

123 Helpful vote Comments

L***n

Taiwan, Province of China

Verified Purchase

5 .0

2025-11-24

I'm highly impressed by the -40 to 85°C operating temp. We tested this 1G industrial optical transceiver in harsh outdoor cabinets. Seamless multi-brand switch compatibility and zero link drops over 15km single-mode fiber runs.

173 Helpful vote Comments

J***z

Kuwait

Verified Purchase

4 .0

2025-11-03

Box was slightly crushed upon arrival, but the 1G BiDi SFP works flawlessly.

156 Helpful vote Comments

B***l

Ecuador

Verified Purchase

5 .0

2025-10-26

No compatibility issues with our Cisco switches.

123 Helpful vote Comments

M***l

Costa Rica

Verified Purchase

5 .0

2025-10-15

Bought 50 units for our ISP ring. The single-mode simplex LC setup saves fiber.

21 Helpful vote Comments

D***n

Greece

Verified Purchase

5 .0

2025-07-30

Great price for an industrial temp BiDi SFP.

89 Helpful vote Comments

R***t

Colombia

Verified Purchase

5 .0

2025-07-14

Plug and play! This 1G industrial transceiver handles our outdoor camera network effortlessly.

79 Helpful vote Comments

R***s

Ecuador

Verified Purchase

5 .0

2025-04-25

Solid 20km SMF module. Dom features are accurate.

95 Helpful vote Comments

M***a

Brazil

Verified Purchase

5 .0

2025-04-18

Perfect 1G SFP for our campus network!

47 Helpful vote Comments

D***a

Costa Rica

Verified Purchase

5 .0

2025-04-12

Worked immediately with our Ubiquiti gear. The 1310nm-TX/1490nm-RX wavelengths paired up perfectly. ✌️

16 Helpful vote Comments

T***t

Ecuador

Verified Purchase

5 .0

2025-02-14

Flawless 1310/1490nm operation in our datacenter.

39 Helpful vote Comments

T***s

Japan

Verified Purchase

5 .0

2025-01-30

Fast Ethernet backward compatibility is a lifesaver.

190 Helpful vote Comments

R***t

Czech Republic

Verified Purchase

5 .0

2024-12-19

Excellent MSA compliant gigabit module. Will buy again!

84 Helpful vote Comments

K***n

Italy

Verified Purchase

5 .0

2024-12-12

Works great in our outdoor cabinet setups.

131 Helpful vote Comments

B***e

Ireland

Verified Purchase

5 .0

2024-11-21

We deployed these 1G BiDi SFPs for base station backhaul. Stable under extreme heat!

43 Helpful vote Comments

S***n

Ireland

Verified Purchase

5 .0

2024-11-08

Replaced some old optics with these MSA compatible 1G Bidi modules. Smooth migration.

214 Helpful vote Comments

J***n

Hong Kong

Verified Purchase

5 .0

2024-10-11

Excellent DDM/DOM reporting. We use this 20km transceiver module across multiple remote industrial sites.

81 Helpful vote Comments

Verified Purchase

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LINK-PP LS-BL31491G-20I 1G SFP BiDi 1310nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)

Product Details

LINK-PP LS-BL31491G-20I 1G BiDi SFP Specifications

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Key Features of LINK-PP LS-BL31491G-20I 1G BiDi SFP

LINK-PP LS-BL31491G-20I 1G BiDi SFP Optical Module

LS-BL31491G-20I: 1G Connectivity for Server Interconnection

LS-BL31491G-20I Module with 1310nm-TX and 1490nm-RX Wavelength

LS-BL31491G-20I Module Supporting 20km Transmission

LS-BL31491G-20I Module with Simplex LC Interface

LS-BL31491G-20I Module with DOM for Real-Time Monitoring

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