Will this 1G BiDi module play nice with a mix of Cisco Catalyst and Ubiquiti EdgeSwitches?

Absolutely! The LS-BL31491G-40I is 100% MSA compliant. We've extensively tested it for cross-brand interoperability, so you can seamlessly link your Cisco and Ubiquiti gear without throwing any frustrating "unsupported transceiver" errors.

We have outdoor telecom enclosures that hit 80°C in the summer and -30°C in winter. Can this optic survive without active cooling?

Definitely. This is a true industrial-grade module specifically engineered for extreme outdoor environments. It supports a wide operating temperature range of -40°C to 85°C, making it perfect for unventilated cabinets and harsh cell tower deployments.

We're looking to deploy about 300 of these for a city-wide campus network. Do you guys offer any volume discounts?

Yes, we provide tiered pricing for bulk rollouts! For a procurement batch of 300 units, you'll see a significant drop in the per-unit cost. Just hit up our sales team via live chat or email to get a custom wholesale quote.

Does this transceiver support standard DDM/DOM for SNMP monitoring? Need to ensure it meets our data center compliance.

Yes, it fully supports DDM (Digital Diagnostic Monitoring) per the SFF-8472 standard. Your network management system can easily pull real-time data on optical TX/RX power, voltage, and laser temperature via SNMP to maintain industry compliance.

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LINK-PP LS-BL31491G-40I 1G SFP BiDi 1310nm-TX/1490nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-BL31491G-40I 1G SFP BiDi 1310nm-TX/1490nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 181231
Price: 6.511 USD
Availability: InStock
Rating: 4.9 (37 reviews)

# 181231

Product: LINK-PP LS-BL31491G-40I 1G SFP BiDi 1310nm-TX/1490nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 181231
P/N: LS-BL31491G-40I
Price: $ 7.57
Stock: 1620 in Stock
Sold: 480
Product URL: https://www.l-p.com/products/476194.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

37 Reviews

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Manufacture: LINK-PP

P/N: LS-BL31491G-40I

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-40I 1G SFP Specifications

The LINK-PP LS-BL31491G-40I 1G SFP is a high-performance single-mode BiDi transceiver designed for long-haul Gigabit Ethernet applications. Engineered to meet strict industrial standards, this optical transceiver combines a 1310nm DFB transmitter and a 1490nm PIN receiver over a single fiber, delivering a robust 1.25 Gbps data rate and an exceptional 40km link budget for critical network deployments.

LINK-PP Part Number	LS-BL31491G-40I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm-TX/1490nm-RX	Max Cable Distance	40km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-5 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-24dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: Will this 1G BiDi module play nice with a mix of Cisco Catalyst and Ubiquiti EdgeSwitches? By C***s on 2026-05-12

A: Absolutely! The LS-BL31491G-40I is 100% MSA compliant. We've extensively tested it for cross-brand interoperability, so you can seamlessly link your Cisco and Ubiquiti gear without throwing any frustrating "unsupported transceiver" errors. By admin on 2026-05-13
Q: We have outdoor telecom enclosures that hit 80°C in the summer and -30°C in winter. Can this optic survive without active cooling? By J***z on 2025-10-01

A: Definitely. This is a true industrial-grade module specifically engineered for extreme outdoor environments. It supports a wide operating temperature range of -40°C to 85°C, making it perfect for unventilated cabinets and harsh cell tower deployments. By admin on 2025-10-01
Q: We're looking to deploy about 300 of these for a city-wide campus network. Do you guys offer any volume discounts? By D***z on 2025-08-01

A: Yes, we provide tiered pricing for bulk rollouts! For a procurement batch of 300 units, you'll see a significant drop in the per-unit cost. Just hit up our sales team via live chat or email to get a custom wholesale quote. By admin on 2025-08-01
Q: Does this transceiver support standard DDM/DOM for SNMP monitoring? Need to ensure it meets our data center compliance. By S***r on 2025-06-25

A: Yes, it fully supports DDM (Digital Diagnostic Monitoring) per the SFF-8472 standard. Your network management system can easily pull real-time data on optical TX/RX power, voltage, and laser temperature via SNMP to maintain industry compliance. By admin on 2025-06-25

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J***n

Mexico

Verified Purchase

5 .0

2026-06-12

Deployed these 40km simplex SFPs for a rural ISP backhaul, latency is consistently low.

197 Helpful vote Comments

A***z

Greece

Verified Purchase

4 .0

2026-05-31

Took an extra day to reach our UK facility, but DOM readings are solid.

175 Helpful vote Comments

S***g

Brazil

Verified Purchase

5 .0

2026-05-23

Grabbed a batch for our German factory floor. High vibration and heat, zero packet loss.

98 Helpful vote Comments

S***s

Czech Republic

Verified Purchase

5 .0

2026-05-21

Best budget industrial SFP for cell backhaul.

183 Helpful vote Comments

L***s

Macao

Verified Purchase

5 .0

2026-04-23

We manage cellular base station backhauls across Canada. These 1G BiDi LC SFPs withstand extreme -40°C winters flawlessly. Digital Diagnostics Monitoring (DDM) gives us reliable real-time visibility into link health before truck rolls.

101 Helpful vote Comments

J***l

Bolivia

Verified Purchase

5 .0

2026-04-22

Fast delivery to Texas, modules run cool.

58 Helpful vote Comments

P***z

Greece

Verified Purchase

5 .0

2026-04-20

The DFB transmitter punches through our aging SMF plant over 35km with great RX margins. ⚡

47 Helpful vote Comments

B***n

France

Verified Purchase

5 .0

2026-04-14

Single-mode simplex LC saves our fiber strands!

162 Helpful vote Comments

R***r

Philippines

Verified Purchase

5 .0

2026-04-06

TX1310/RX1490 BiDi modules running smoothly.

39 Helpful vote Comments

J***r

Panama

Verified Purchase

5 .0

2026-04-05

Good DDM accuracy, highly recommend this optic.

97 Helpful vote Comments

P***s

India

Verified Purchase

5 .0

2026-03-27

Fits perfectly into our Aruba and Juniper gear without triggering unsupported transceiver warnings.

127 Helpful vote Comments

S***s

Argentina

Verified Purchase

5 .0

2026-03-25

Survived the Arizona summer in an unventilated outdoor enclosure. True -40 to 85°C rating!

48 Helpful vote Comments

C***n

Colombia

Verified Purchase

5 .0

2026-03-11

Tested these LINK-PP industrial modules in a multi-vendor ring topology. The TX1310nm/RX1490nm pairs synced instantly across Cisco and Mikrotik hardware. Optical power sits comfortably at -3dBm after a 38km run. Excellent TCO!

165 Helpful vote Comments

A***z

Portugal

Verified Purchase

5 .0

2026-02-16

Rock solid 40km link for campus network.

220 Helpful vote Comments

B***g

Norway

Verified Purchase

5 .0

2026-01-31

Great MSA compatibility for mixed-brand environment.

155 Helpful vote Comments

E***z

Ukraine

Verified Purchase

5 .0

2026-01-31

Excellent DOM support. Monitoring laser bias current and temps via SNMP is super easy.

159 Helpful vote Comments

M***l

Poland

Verified Purchase

5 .0

2026-01-31

Halved our fiber leasing costs thanks to the single LC 1310/1490nm bidirectional design.

123 Helpful vote Comments

S***s

Republic of Korea

Verified Purchase

5 .0

2026-01-24

Flawless Gigabit Fibre Channel operation over SMF.

70 Helpful vote Comments

T***z

New Zealand

Verified Purchase

4 .0

2026-01-15

Shipping box was slightly dented upon arrival, but the 1G BiDi SFP works perfectly.

85 Helpful vote Comments

P***l

Egypt

Verified Purchase

5 .0

2025-12-25

Using this 1G BiDi SFP to bridge my home NAS to the garage. Works perfectly!

109 Helpful vote Comments

C***s

Saudi Arabia

Verified Purchase

5 .0

2025-12-05

Perfect industrial SFP for outdoor cabinet deployments!

224 Helpful vote Comments

M***r

United Kingdom

Verified Purchase

5 .0

2025-11-16

Plug and play with Cisco switches!

72 Helpful vote Comments

M***t

Viet Nam

Verified Purchase

5 .0

2025-10-26

Procurement was skeptical about third-party optics, but MSA compliance is spot on. We batch-deployed 200 units across our EU data centers. The 1.25Gbps throughput is stable, and single-fiber operation drastically simplified our patch panels.

101 Helpful vote Comments

R***z

Panama

Verified Purchase

5 .0

2025-10-10

1.25G throughput is stable at -30°C. ❄️

89 Helpful vote Comments

M***a

Argentina

Verified Purchase

5 .0

2025-10-01

Upgraded an older manufacturing plant network. Running simplex SMF was our only option. This 40km transceiver handles industrial EMI and 80°C ambient temps inside our NEMA enclosures without dropping a single frame. Impressive!

106 Helpful vote Comments

C***y

Denmark

Verified Purchase

5 .0

2024-03-29

Excellent support while buying and quick problem resolving. Flawless operation on equipment and top performance.

54 Helpful vote Comments

G***g

Italy

Verified Purchase

5 .0

2024-01-19

The shopping experience is amazing. The Account Manager is so nice and considerate. She helped a lot during the purchaing.Even after I placed my order, she contuined to send emails to inform me about the logistic.

39 Helpful vote Comments

A***n

United Kingdom

Verified Purchase

5 .0

2023-10-19

This is honestly my favorite and go-to place to order all my rj 45needs. The shipping is great! Customer service excellent! I would recommend this company to anyone!!!

96 Helpful vote Comments

P***n

New Zealand

Verified Purchase

5 .0

2023-09-05

Very pleased with the service I received. I received the Optical Transceiver Module quickly. Good quality, great price! Highly recommend!

49 Helpful vote Comments

D***o

Ireland

Verified Purchase

5 .0

2023-08-19

Great online store! I was satisfied with the service, the sales girl helped me choose the right Transceiver Module. Really thanks!

47 Helpful vote Comments

N***i

United States

Verified Purchase

5 .0

2023-08-08

Great price, easy checkout

14 Helpful vote Comments

J***y

Bulgaria

Verified Purchase

5 .0

2023-07-10

The item was as expected and in good condition. No complaints here.

35 Helpful vote Comments

R***n

Indonesia

Verified Purchase

5 .0

2023-05-30

The price was unbeatable. Items arrived Fast and in perfect condition!

38 Helpful vote Comments

F***h

Denmark

Verified Purchase

5 .0

2023-05-10

The module is working as expected. Thank you LINK-PP for another great product!

85 Helpful vote Comments

A***a

Canada

Verified Purchase

5 .0

2023-05-09

This was the first purchase that I made with LINK-PP and I could not be more pleased with the amazing price or customer service. My packaged was delivered ontime and in perfect shape. Simply awesome!I will be a long time customer!

63 Helpful vote Comments

H***f

Lebanon

Verified Purchase

5 .0

2023-05-05

Thank you for the good quality, I like it very much.

75 Helpful vote Comments

A***g

Hungary

Verified Purchase

5 .0

2023-03-16

Price is less than half of what Pulse charges for their brand. But both the quality and the performance are the same. Why not choose the cheaper ones? Besides,the sales person is very knowledgable and helpful.

99 Helpful vote Comments