We're an ISP doing a massive data center rollout. Can we get a bulk discount if we grab 500+ of these?

Absolutely. We offer aggressive tiered pricing for B2B procurement and IT batch deployments. Just hit up our sales team and they’ll sort out a great volume quote for you.

My telecom cabinets are outdoors. Will this 0-70°C commercial version survive, or should I look for an industrial model?

If your outdoor enclosure has basic climate control, this commercial 0-70°C module works great. But for extreme, unregulated environments, we definitely suggest grabbing our industrial-grade (-40 to 85°C) equivalent for safe backhaul routing.

Hello, will this 1G BiDi SFP play nice with my Cisco Catalyst and Aruba switches out of the box?

Yes! It’s fully MSA compliant and engineered for seamless OEM compatibility across major brands like Cisco, Aruba, and Juniper. It’s plug-and-play with no CLI workarounds needed.

Do these optics support SFF-8472 for DDM/DOM? I need to track power levels remotely.

Yes, they do. The built-in Digital Optical Monitoring (DOM) lets your network admins pull real-time data on temperature, voltage, and TX/RX power to keep your Gigabit Ethernet links rock solid.

Breadcrumb: Home; Products; Optics Transceivers | SFP Modules; 1/2/4G Transceiver Modules; 1G BiDi SFP; 202092

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LINK-PP LS-BL55491G-20C 1G SFP BiDi 1550nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module

Name: LINK-PP LS-BL55491G-20C 1G SFP BiDi 1550nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 202092
Price: 19.78 USD
Availability: InStock
Rating: 5 (47 reviews)

# 202092

Product: LINK-PP LS-BL55491G-20C 1G SFP BiDi 1550nm-TX/1490nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module
SKU: 202092
P/N: LS-BL55491G-20C
Price: $ 23
Stock: 120 in Stock
Sold: 7.9K
Product URL: https://www.l-p.com/products/491575.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

47 Reviews

4 Questions

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7.9K Sold

$ 23

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100

$ 21.85

1000

$ 21.16

3000

$ 20.47

6000

$ 19.78

Manufacture: LINK-PP

P/N: LS-BL55491G-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-BL55491G-20C 1G BiDi SFP Specifications

The LINK-PP LS-BL55491G-20C is a high-performance Gigabit Ethernet transceiver specifically designed for cost-effective networking. This top-tier 1.25Gbps optical module operates efficiently over single-mode fiber, delivering a highly reliable 20km reach. Featuring advanced BiDi SFP specs, it ensures seamless data transmission while minimizing infrastructure costs for modern enterprise environments.

LINK-PP Part Number	LS-BL55491G-20C	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm-TX/1490nm-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: We're an ISP doing a massive data center rollout. Can we get a bulk discount if we grab 500+ of these? By A***z on 2026-05-10

A: Absolutely. We offer aggressive tiered pricing for B2B procurement and IT batch deployments. Just hit up our sales team and they’ll sort out a great volume quote for you. By admin on 2026-05-11
Q: My telecom cabinets are outdoors. Will this 0-70°C commercial version survive, or should I look for an industrial model? By E***n on 2026-05-02

A: If your outdoor enclosure has basic climate control, this commercial 0-70°C module works great. But for extreme, unregulated environments, we definitely suggest grabbing our industrial-grade (-40 to 85°C) equivalent for safe backhaul routing. By admin on 2026-05-02
Q: Hello, will this 1G BiDi SFP play nice with my Cisco Catalyst and Aruba switches out of the box? By M***z on 2026-02-17

A: Yes! It’s fully MSA compliant and engineered for seamless OEM compatibility across major brands like Cisco, Aruba, and Juniper. It’s plug-and-play with no CLI workarounds needed. By admin on 2026-02-18
Q: Do these optics support SFF-8472 for DDM/DOM? I need to track power levels remotely. By L***s on 2026-02-08

A: Yes, they do. The built-in Digital Optical Monitoring (DOM) lets your network admins pull real-time data on temperature, voltage, and TX/RX power to keep your Gigabit Ethernet links rock solid. By admin on 2026-02-08

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K***n

Russian Federation

Verified Purchase

5 .0

2026-06-08

Deployed these 1550nm-TX/1490nm-RX optics for our campus fiber network. Flawless DOM integration with our Cisco switches. DFB laser handles 20km SMF easily. Great TCO for enterprise B2B procurement!

92 Helpful vote Comments

S***r

Ecuador

Verified Purchase

5 .0

2026-04-13

Single fiber optical module saved us massive cabling costs on the university network!

195 Helpful vote Comments

D***n

Chile

Verified Purchase

5 .0

2026-03-25

Bought a batch of these simplex LC DOM modules for a data center upgrade. DDM reads are highly accurate. Solid Gigabit Fibre Channel performance without breaking the IT budget.

146 Helpful vote Comments

W***l

Denmark

Verified Purchase

5 .0

2025-11-28

Products delivered as expected. Arrived a day early. Completely satisfied.

184 Helpful vote Comments

D***n

Portugal

Verified Purchase

5 .0

2025-09-30

SFF-8472 compliant and easily recognized by our Juniper routing equipment. Highly recommended!

199 Helpful vote Comments

S***t

Austria

Verified Purchase

5 .0

2025-09-16

Tested the MSA compliant 1.25G transceiver in our outdoor telecom cabinet. Despite the 0-70°C commercial rating, it stayed cool. Perfect for cell tower base station backhaul setups.

49 Helpful vote Comments

S***a

Greece

Verified Purchase

5 .0

2025-08-30

1550nm TX output is clean. Ideal 1.25Gbps optical module for enterprise IT upgrades. ⚙️

179 Helpful vote Comments

S***l

Sweden

Verified Purchase

5 .0

2025-08-19

Arrived very quickly exactly as ordered. Not finished burn-in testing as I\'m still setting up the two systems.

119 Helpful vote Comments

R***t

Thailand

Verified Purchase

5 .0

2025-08-17

Very happy with the product, price, and arrival of the product!

74 Helpful vote Comments

M***s

Italy

Verified Purchase

5 .0

2025-07-31

Excellent WDM transceiver for the price.

126 Helpful vote Comments

K***z

Venezuela

Verified Purchase

5 .0

2025-07-28

Good MSA compliant optical transceiver.

135 Helpful vote Comments

A***n

Lithuania

Verified Purchase

5 .0

2025-07-06

Detected right away and no issues. Price is great

78 Helpful vote Comments

S***s

Canada

Verified Purchase

4 .0

2025-06-30

FedEx delivery delayed by a day. The 20km simplex LC transceivers are flawless though!

121 Helpful vote Comments

R***n

Sweden

Verified Purchase

5 .0

2025-06-20

Reliable DDM metrics, no connection drops!

89 Helpful vote Comments

A***v

Russian Federation

Verified Purchase

5 .0

2025-06-20

Easy shopping. Nice option to compare different items making it an easy and the best choice. I like dealing with LINK-PP because they are always working to improve, making it easy for the buyer to purchase at the best price.

82 Helpful vote Comments

E***l

Switzerland

Verified Purchase

5 .0

2025-05-16

Great value 1G SFP for homelab NAS.

88 Helpful vote Comments

C***s

United Kingdom

Verified Purchase

5 .0

2025-04-22

Received what I ordered in a timely manner. Products arrived well packed and in perfect condition.

118 Helpful vote Comments

M***z

Denmark

Verified Purchase

5 .0

2025-04-17

Smooth Gigabit fiber channel sync. ⚡

166 Helpful vote Comments

W***a

Germany

Verified Purchase

5 .0

2025-04-15

Well-made and works fine. Will recommend it to others.

88 Helpful vote Comments

W***a

Canada

Verified Purchase

5 .0

2025-03-15

Fast Ethernet fiber link stable at 15km. Great 1G SFP BiDi module deal.

170 Helpful vote Comments

K***z

Austria

Verified Purchase

5 .0

2025-03-08

1490nm RX sensitivity is exactly as rated.

56 Helpful vote Comments

L***n

France

Verified Purchase

5 .0

2025-03-02

Using this single-mode WDM SFP for a long-distance homelab NAS link. OEM compatibility is spot on with my Ubiquiti gear. -23dBm receiver sensitivity ensures zero packet loss.

135 Helpful vote Comments

A***n

Macao

Verified Purchase

5 .0

2025-02-11

LC simplex connector snaps in perfectly.

187 Helpful vote Comments

D***s

Ireland

Verified Purchase

5 .0

2025-01-22

Perfect commercial grade 0-70°C optic.

164 Helpful vote Comments

E***z

Taiwan, Province of China

Verified Purchase

5 .0

2024-12-19

Always the best prices and availability.

86 Helpful vote Comments

E***z

Peru

Verified Purchase

5 .0

2024-12-13

Cheapest Cisco compatible 1G SFP for Dallas data centers! Plug and play simplicity.

143 Helpful vote Comments

B***i

Belarus

Verified Purchase

5 .0

2024-11-22

First time buying from you guys! Hope everything's fine.

141 Helpful vote Comments

D***z

Russian Federation

Verified Purchase

5 .0

2024-10-31

The DOM monitoring on this 1G bidirectional SFP is a lifesaver for troubleshooting.

144 Helpful vote Comments

C***n

Italy

Verified Purchase

5 .0

2024-10-24

Best 1G BiDi module for SMF links.

156 Helpful vote Comments

G***m

United States

Verified Purchase

5 .0

2024-09-30

These are quality built, and look great.

65 Helpful vote Comments

H***n

Hong Kong

Verified Purchase

5 .0

2024-06-17

Fast shipping, good service, high quality.

29 Helpful vote Comments

K***a

United States

Verified Purchase

5 .0

2024-06-05

Great website. Great selection of products. Great prices. Fast processing of orders.

37 Helpful vote Comments

M***n

United States

Verified Purchase

5 .0

2024-04-29

My friend recommended l-p.com to me before, so I placed a testing order. Everything goes well.

154 Helpful vote Comments

J***g

Norway

Verified Purchase

5 .0

2023-09-15

No issues whatsoever. We\'ll built. Fits perfectly on the switch.

146 Helpful vote Comments

M***y

Malaysia

Verified Purchase

5 .0

2023-05-24

We've communicate with several companies before and they were not able to offer enough amount we expected. But Link pp did it. Would like to do business again with them.

104 Helpful vote Comments

C***r

Brunei Darussalam

Verified Purchase

5 .0

2023-05-16

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!!!

128 Helpful vote Comments

H***s

Belgium

Verified Purchase

5 .0

2023-04-07

I love these items, they are excellent. I ordered and deployed several of these for my switches, haven’t had any issues so far. Easy to install as expected and they increased my internal speed! Compared to the Cisco version,

27 Helpful vote Comments

E***g

Bulgaria

Verified Purchase

5 .0

2023-03-02

Part arrived within 15 days and was exactly as described. I was very satisfied.

12 Helpful vote Comments

G***g

Bangladesh

Verified Purchase

5 .0