Looking to mass deploy these for our campus fiber network. Any chance you offer B2B bulk pricing for 200+ units?

Yes, we provide tiered bulk discounts for data centers, ISPs, and enterprise deployments. Just drop a message to our sales team with your exact quantity for a custom quote to optimize your procurement budget.

Are these 1.25G BiDi SFP transceivers compatible with Cisco and Ubiquiti switches out of the box?

Absolutely! They comply with the SFP MSA standard and feature excellent OEM compatibility, meaning true plug-and-play operation for Cisco, Ubiquiti, MikroTik, and most major switch brands without throwing unrecognized module errors.

Can I hook these up to multi-mode fiber, or do they strictly need Single Mode Fiber (SMF) with Simplex LC?

This specific transceiver is designed exclusively for Single Mode Fiber (SMF) using a Simplex LC/UPC connector to achieve the 20km range. Connecting it to multi-mode fiber will cause severe signal degradation.

The commercial temp (0~70°C) is cool for indoor racks, but we've got outdoor cabinets. Do you guys make an industrial wide-temp version?

We sure do! While this model is optimized for commercial use, we offer industrial-grade counterparts that operate flawlessly from -40°C to 85°C. They are perfect for extreme environments like base station backhaul or harsh outdoor enclosures.

Breadcrumb: Home; Products; Optics Transceivers | SFP Modules; 1/2/4G Transceiver Modules; 1G BiDi SFP; 202090

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LINK-PP LS-BL49551G-20C 1G SFP BiDi 1490nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module

Name: LINK-PP LS-BL49551G-20C 1G SFP BiDi 1490nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 202090
Price: 19.78 USD
Availability: InStock
Rating: 5 (52 reviews)

# 202090

Product: LINK-PP LS-BL49551G-20C 1G SFP BiDi 1490nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module
SKU: 202090
P/N: LS-BL49551G-20C
Price: $ 23
Stock: 120 in Stock
Sold: 7.9K
Product URL: https://www.l-p.com/products/491573.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

52 Reviews

4 Questions

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7.9K Sold

$ 23

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Unit Price :

$ 23

100

$ 21.85

1000

$ 21.16

3000

$ 20.47

6000

$ 19.78

Manufacture: LINK-PP

P/N: LS-BL49551G-20C

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-BL49551G-20C 1G BiDi SFP Specifications

The LINK-PP LS-BL49551G-20C is a high-performance 1G BiDi SFP transceiver engineered for robust gigabit ethernet connectivity. This single-mode fiber optical module utilizes advanced DFB laser technology and a sensitive PIN detector to ensure stable data transmission. Designed for commercial environments, it delivers exceptional reliability across diverse enterprise network infrastructure deployments.

LINK-PP Part Number	LS-BL49551G-20C	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1490nm-TX/1550nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	-23dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: Looking to mass deploy these for our campus fiber network. Any chance you offer B2B bulk pricing for 200+ units? By M***s on 2026-07-07

A: Yes, we provide tiered bulk discounts for data centers, ISPs, and enterprise deployments. Just drop a message to our sales team with your exact quantity for a custom quote to optimize your procurement budget. By admin on 2026-07-07
Q: Are these 1.25G BiDi SFP transceivers compatible with Cisco and Ubiquiti switches out of the box? By C***z on 2026-06-20

A: Absolutely! They comply with the SFP MSA standard and feature excellent OEM compatibility, meaning true plug-and-play operation for Cisco, Ubiquiti, MikroTik, and most major switch brands without throwing unrecognized module errors. By admin on 2026-06-20
Q: Can I hook these up to multi-mode fiber, or do they strictly need Single Mode Fiber (SMF) with Simplex LC? By R***z on 2026-05-26

A: This specific transceiver is designed exclusively for Single Mode Fiber (SMF) using a Simplex LC/UPC connector to achieve the 20km range. Connecting it to multi-mode fiber will cause severe signal degradation. By admin on 2026-05-26
Q: The commercial temp (0~70°C) is cool for indoor racks, but we've got outdoor cabinets. Do you guys make an industrial wide-temp version? By C***s on 2026-04-04

A: We sure do! While this model is optimized for commercial use, we offer industrial-grade counterparts that operate flawlessly from -40°C to 85°C. They are perfect for extreme environments like base station backhaul or harsh outdoor enclosures. By admin on 2026-04-05

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K***z

Portugal

Verified Purchase

5 .0

2026-05-31

DFB laser transmitter works great. Stable 1490nm-TX connection across our industrial campus fiber network.

125 Helpful vote Comments

C***n

Sweden

Verified Purchase

5 .0

2026-05-24

Simplex LC plugged right in. No issues.

186 Helpful vote Comments

M***r

New Zealand

Verified Purchase

5 .0

2026-05-16

Perfect 20km SMF modules. Very reliable!

136 Helpful vote Comments

N***e

Norway

Verified Purchase

5 .0

2026-03-14

Solid UKCA compliant 20km SFP modules. Linked my Cisco and Ubiquiti switches without fuss.

86 Helpful vote Comments

C***z

Germany

Verified Purchase

5 .0

2026-01-24

Base station backhaul is stable now!

165 Helpful vote Comments

L***n

Austria

Verified Purchase

5 .0

2026-01-22

Great 1.25G BiDi SFP for the price!

215 Helpful vote Comments

P***e

Maldives

Verified Purchase

5 .0

2025-12-23

Generally quick and easy to find what I'm looking for- and fair prices.

31 Helpful vote Comments

J***n

United Kingdom

Verified Purchase

5 .0

2025-12-23

Good value for Simplex LC/UPC transceivers. We use them everywhere for IP camera backhaul.

48 Helpful vote Comments

D***n

New Zealand

Verified Purchase

4 .0

2025-12-11

Shipping to Germany took an extra day, but the 1.25G BiDi SFPs survived perfectly. Good DDM readings.

172 Helpful vote Comments

A***a

Poland

Verified Purchase

5 .0

2025-12-09

Very friendly and customber satisfaction. Couldn't be happier with the service.

107 Helpful vote Comments

S***g

Denmark

Verified Purchase

5 .0

2025-12-08

Ran a massive batch deployment of these LS-BL49551G-20C modules for our rural base station backhaul. The 20km distance on single SMF saves us crazy money. SFF-8472 DOM metrics are perfectly readable!

166 Helpful vote Comments

M***l

United States

Verified Purchase

5 .0

2025-11-29

good service

129 Helpful vote Comments

C***s

Ukraine

Verified Purchase

5 .0

2025-11-18

Always very personable and professional. Orders are filled and shipped timely, and usually arrive earlier than expected.

66 Helpful vote Comments

R***l

Mexico

Verified Purchase

5 .0

2025-10-16

Fast shipping, tested good on MikroTik. (^_^)

174 Helpful vote Comments

R***n

Thailand

Verified Purchase

5 .0

2025-10-08

Solid DOM readings for my outdoor cabinets.

64 Helpful vote Comments

D***g

Indonesia

Verified Purchase

5 .0

2025-10-05

Link-pp is the best, highly compatible.

48 Helpful vote Comments

P***l

Greece

Verified Purchase

5 .0

2025-08-30

Upgraded my home 10G NAS setup, these 1.25G modules handle management links perfectly.

116 Helpful vote Comments

N***s

Macao

Verified Purchase

5 .0

2025-07-31

Replaced old optics with these. The DDM diagnostic feature is super handy for sysadmins.

152 Helpful vote Comments

M***k

Romania

Verified Purchase

5 .0

2025-07-19

I appreciate the quality of your products.

11 Helpful vote Comments

M***n

Austria

Verified Purchase

5 .0

2025-07-13

Cost-effective SMF optical module, highly recommended.

145 Helpful vote Comments

T***r

Spain

Verified Purchase

5 .0

2025-06-13

Shipped quickly and works perfectly.

54 Helpful vote Comments

L***n

Panama

Verified Purchase

5 .0

2025-05-18

Placed in our campus fiber network. Flawless.

112 Helpful vote Comments

L***n

Germany

Verified Purchase

5 .0

2025-05-02

I'm a network engineer testing OEM compatibility. These 1.25G BiDi SFPs link perfectly between Juniper and Arista gear. The 1490TX/1550RX simplex LC setup is highly efficient for campus fiber upgrades. Awesome!

145 Helpful vote Comments

M***r

Republic of Korea

Verified Purchase

5 .0

2025-04-22

Hooked this 1.25G optical transceiver to my home 10G NAS switch for a long-distance uplink. Zero packet loss on the 1550nm-RX side. Build quality and UL certification give me peace of mind.

86 Helpful vote Comments

E***e

France

Verified Purchase

5 .0

2025-03-15

SFP MSA compatible. Worked instantly! ⚡

127 Helpful vote Comments

K***v

United States

Verified Purchase

5 .0

2025-02-19

Product works very fine.

61 Helpful vote Comments

M***r

Sweden

Verified Purchase

5 .0

2025-01-05

Using these in harsh outdoor cabinets. Though not the industrial version, the commercial temp holds up well. Great ROI and TCO for enterprise networks. DDM helps me check optical power remotely. ☀️

148 Helpful vote Comments

W***a

United States

Verified Purchase

5 .0

2024-12-28

All good well packaged and delivered quality product for great price.

14 Helpful vote Comments

M***l

United States

Verified Purchase

5 .0

2024-12-05

OEM compatibility is spot on.

91 Helpful vote Comments

J***d

France

Verified Purchase

5 .0

2024-11-21

Fast and efficient. The receiving of my items only took a few days, in perfect condition.

35 Helpful vote Comments

J***l

Netherlands

Verified Purchase

5 .0

2024-10-28

Batch deployment in our server room was a breeze. DOM specs are highly accurate!

54 Helpful vote Comments

J***e

United States

Verified Purchase

5 .0

2024-10-27

Super Product, will buy again.

21 Helpful vote Comments

M***n

Singapore

Verified Purchase

5 .0

2024-10-02

They are both working just fine. I plan to use these for future fiber networking needs.

15 Helpful vote Comments

J***m

Bulgaria

Verified Purchase

5 .0

2024-08-26

Very nice sales to speak to and knowledgeable on the products they sell!

35 Helpful vote Comments

M***l

Poland

Verified Purchase

5 .0

2024-08-02

I had a good experience. No problems. Fast customer service.

22 Helpful vote Comments

H***r

Spain

Verified Purchase

5 .0

2024-07-16

Live chat was prompt and very informative of specifics guiding me and letting to choose the best options. Ordering was easy, check out was Fast.. Looking forward to receiving product.

43 Helpful vote Comments

D***a

Philippines

Verified Purchase

5 .0

2024-05-26

Fast shipping - good quality - probably buy another model here soon

83 Helpful vote Comments

P***h

Singapore

Verified Purchase

5 .0