What makes this 1550nm-TX/1310nm-RX BiDi SFP different from a normal duplex SFP?

This BiDi SFP uses WDM technology to send and receive signals on different wavelengths through a single fiber strand, reducing fiber usage compared with traditional duplex SFP modules. It is ideal for network upgrades where fiber resources are limited.

Will this industrial BiDi SFP work with my existing network switch from another brand?

Yes. This module supports OEM-compatible coding options for many major networking platforms. Please select the correct compatibility version when ordering to ensure seamless integration with your switch or router.

Is this 1G SFP suitable for outdoor cabinets and industrial Ethernet applications?

Yes. LS-BL55311G-20I is an industrial-grade optical transceiver designed for demanding environments. Its wide operating temperature range, DOM/DDM monitoring, and stable 1Gbps transmission make it suitable for outdoor cabinets, industrial networks, telecom access, and remote fiber deployments.

Can LS-BL55311G-20I support a 20km connection using standard single-mode fiber?

Yes. LS-BL55311G-20I is a 1G BiDi SFP transceiver designed for up to 20km transmission over single-mode fiber (SMF). It uses a simplex LC interface with 1550nm-TX and 1310nm-RX WDM technology to transmit and receive data through one fiber strand.

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LINK-PP LS-BL55311G-20I 1G BiDi SFP 1550nm-TX/1310nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-BL55311G-20I 1G BiDi SFP 1550nm-TX/1310nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 183750
Price: 7.31 USD
Availability: InStock
Rating: 5 (25 reviews)

Product: LINK-PP LS-BL55311G-20I 1G BiDi SFP 1550nm-TX/1310nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module (Industrial)
SKU: 183750
P/N: LS-BL55311G-20I
Price: $ 8.5
Stock: 642 in Stock
Sold: 458
Product URL: https://www.l-p.com/products/478709.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

458 Sold

$ 8.5

Free shipping. For wholesale pricing, please contact us directly.

Qty (pcs) :

Unit Price :

$ 8.5

100

$ 8.075

1000

$ 7.82

3000

$ 7.565

6000

$ 7.31

Manufacture: LINK-PP P/N: LS-BL55311G-20I SKU: 183750

Compatible:: LINK-PP; Dahua

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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Estimated delivery time : 3 - 10 days.

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LINK-PP LS-BL55311G-20I 1G BiDi SFP Specifications

The LINK-PP LS-BL55311G-20I is a 1.25 Gbps BiDi optical transceiver designed to transmit data over distances of up to 20 kilometers. It operates using a 1550nm transmit and 1310nm receive wavelength pairing, enabling efficient bidirectional communication over a single fiber strand.

LINK-PP Part Number	LS-BL55311G-20I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm-TX/1310nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB BiDi	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-23dBm	Receiver Overload	-1dBm
Operating Temperature Range	-40 to 85°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

Key Features of LINK-PP LS-BL55311G-20I 1G BiDi SFP

With the LINK-PP LS-BL55311G-20I, you can achieve dependable medium-range connectivity. Built for industrial environments, this BiDi optical module supports data rates up to 1.25 Gbps across distances of up to 20 km. Its single-fiber, full-duplex capability reduces infrastructure requirements while ensuring consistent and long-lasting performance even under demanding conditions.

LINK-PP LS-BL55311G-20I 1G BiDi SFP Optical Module

Featuring a high-performance DFB laser and a PIN receiver, the LINK-PP LS-BL55311G-20I optical module ensures precise wavelength alignment between transmission and reception. This allows for efficient bidirectional transmission over a single cable while preserving high optical stability and signal quality.

LS-BL55311G-20I: Reliable 1.25 Gbps Connectivity for Efficient Gigabit Connectivity

Offering stable 1.25 Gbps performance, the LINK-PP LS-BL55311G-20I BiDi SFP module is ideal for Gigabit Ethernet and fiber channels. It supports stable data transfer, reduced latency, and improved network efficiency across enterprise, telecom, and industrial networks.

LS-BL55311G-20I Module with 1550nm-TX/1310nm-RX Wavelength

Featuring a 1550 nm transmit and 1310 nm receive wavelength combination, this LINK-PP LS-BL55311G-20I BiDi SFP module makes efficient bidirectional communication possible through just one fiber.

LS-BL55311G-20I Module Supporting 20km Transmission

With a transmission distance of up to 20 km under standard conditions, this LINK-PP LS-BL55311G-20I 1G BiDi SFP module is built for long-range reliability, perfect for campus networks, industrial systems, and metropolitan access connections.

LS-BL55311G-20I Module with Simplex LC Interface

By integrating both transmit and receive functions into a single simplex LC port, this LINK-PP LS-BL55311G-20I 1G BiDi SFP module minimizes fiber usage and streamlines cable management, resulting in a cleaner installation and lower infrastructure costs.

LS-BL55311G-20I Module with DOM for Real-Time Monitoring

The built-in Digital Optical Monitoring (DOM) enhances network reliability through continuous supervision of key optical and electrical parameters.

LINK-PP LS-BL55311G-20I 1G BiDi SFP Certification

Certified under ISO 9001 and aligned with CE, RoHS, and FCC standards, LINK-PP modules embody high-quality design and trusted global compliance.

LS-BL55311G-20I Quality Testing Program

Extensive testing procedures ensure robust and stable module performance.

LS-BL55311G-20I Quality Certifications

Developed in line with international standards for reliability and compliance.

LS-BL55311G-20I Certified for Reliable Host-Device Compatibility

Fully tested with LINK-PP systems to ensure consistent compatibility.

Rigorous Testing Ensures Reliable SFP Performance

Each module is thoroughly checked to maintain high signal fidelity. Explore more at the LINK-PP Test Support Center.

Rigorous Testing Ensures Reliable Transceiver Performance

Optical Spectrum Test

Optical spectrum testing ensures accurate wavelength performance and compliance with required optical standards.

Eye Pattern Test

Eye pattern testing validates signal waveform clarity for stable and reliable data transmission.

Bit Error Rate Test

Bit error rate testing confirms low error levels for reliable data integrity and transmission accuracy.

Temperature Test

Temperature testing verifies stable module performance across a wide operating temperature range.

Product Shipping for LINK-PP LS-BL55311G-20I 1G BiDi SFP

Timely, secure international delivery for each LINK-PP optical module is handled by experienced logistics partners.

Anti-Static Protective Packaging

Static-resistant packaging ensures the safety of sensitive electronics and their optimal performance.

Shock-Resistant Transport Protection

Reinforced packaging solutions protect products from shocks and handling stress.

Fast Order Processing and Dispatch

Quick dispatch services enable a faster turnaround.

Global Logistics and International Delivery

International delivery services provide secure and timely shipment worldwide.

LINK-PP LS-BL55311G-20I 1G BiDi SFP Usage Demonstration

Ideal for fiber-constrained environments, this LINK-PP LS-BL55311G-20I 1G BiDi SFP module supports efficient single-fiber communication between switches, routers, and media converters across industrial Ethernet networks, fiber-to-the-building (FTTB) setups, and surveillance systems.

LS-BL55311G-20I Technical Support

LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.

Pre-Sales Technical Consultation

Professional technical guidance to help customers select the most suitable LS-BL55311G-20I modules based on network architecture and application requirements.

Compatibility Verification Support

Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.

Deployment & Installation Assistance

Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.

LINK-PP LS-BL55311G-20I 1G BiDi SFP After-Sales Assurance

LINK-PP provides after-sales support for the smooth deployment and reliable operation of the optical modules.

15-day no-reason return and refund

Free replacement for dead-on-arrival (DOA) or defective items within the initial period

Free repair services for manufacturing defects throughout the warranty period

Warranty exclusions and conditions apply

Model Comparison Table

	Current Model LS-BL55311G-20I	LS-BL55311G-10I	LS-BL55311G-60I	LS-BL55311G-03I	LS-BL55311G-40I	LS-BL55311G-02C

Compatible	LINK-PP	LINK-PP	LINK-PP	LINK-PP	LINK-PP	LINK-PP
Data Rate (Max)	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps
Wavelength	1550nm-TX/1310nm-RX	1550nm-TX/1310nm-RX	1550nm-TX/1310nm-RX	1550nm-TX/1310nm-RX	1550nm-TX/1310nm-RX	1550nm-TX/1310nm-RX
Connector	Simplex LC	Simplex LC	Simplex LC	Simplex LC	Simplex LC	Simplex LC
Cable Distance (Max)	20km	10km	60km	3km	40km	2km
Cable Type	SMF	SMF	SMF	SMF	SMF	SMF
TX Power	-9 to 0dBm	-9 to 0dBm	-5 to 0dBm	-15 to -8dBm	-5 to 0dBm	-15 to -8dBm
Receiver Sensitivity	-23 to -1dBm	-23 to -1dBm	-23 to -1dBm	-23 to -1dBm	-23 to -1dBm	-23 to -1dBm
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	0 to 70°C
Form Factor	SFP	SFP	SFP	SFP	SFP	SFP
Transmitter Type	DFB BiDi	DFB BiDi	DFB	FP	DFB BiDi	FP
Receiver Type	PIN	PIN	PIN	PIN	PIN	PIN
Receiver Overload	-1dBm	-1dBm		-1dBm	-1dBm
Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Questions & Answers
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Q: What makes this 1550nm-TX/1310nm-RX BiDi SFP different from a normal duplex SFP? By C***z on 2026-06-25

A: This BiDi SFP uses WDM technology to send and receive signals on different wavelengths through a single fiber strand, reducing fiber usage compared with traditional duplex SFP modules. It is ideal for network upgrades where fiber resources are limited. By admin on 2026-06-26
Q: Will this industrial BiDi SFP work with my existing network switch from another brand? By E***r on 2025-12-30

A: Yes. This module supports OEM-compatible coding options for many major networking platforms. Please select the correct compatibility version when ordering to ensure seamless integration with your switch or router. By admin on 2025-12-30
Q: Is this 1G SFP suitable for outdoor cabinets and industrial Ethernet applications? By K***l on 2025-11-17

A: Yes. LS-BL55311G-20I is an industrial-grade optical transceiver designed for demanding environments. Its wide operating temperature range, DOM/DDM monitoring, and stable 1Gbps transmission make it suitable for outdoor cabinets, industrial networks, telecom access, and remote fiber deployments. By admin on 2025-11-18
Q: Can LS-BL55311G-20I support a 20km connection using standard single-mode fiber? By J***n on 2025-06-15

A: Yes. LS-BL55311G-20I is a 1G BiDi SFP transceiver designed for up to 20km transmission over single-mode fiber (SMF). It uses a simplex LC interface with 1550nm-TX and 1310nm-RX WDM technology to transmit and receive data through one fiber strand. By admin on 2025-06-16

Customer Reviews
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G***r

India

Verified Purchase

5 .0

2026-07-14

Bought these for a base station backhaul upgrade. The 1550nm transmit and 1310nm receive wavelength combination matched our existing BiDi fiber design perfectly.

76 Helpful vote Comments

N***s

Singapore

Verified Purchase

5 .0

2026-07-07

Works exactly as described :-)

63 Helpful vote Comments

A***e

Netherlands

Verified Purchase

5 .0

2026-06-29

Stable 1000Mbps fiber link for our data center rooms.

7 Helpful vote Comments

E***y

Iran, Islamic Republic of

Verified Purchase

5 .0

2026-06-09

Great industrial optic for remote sites.

76 Helpful vote Comments

S***k

Italy

Verified Purchase

5 .0

2026-02-22

Perfect replacement for expensive branded optics :D

42 Helpful vote Comments

N***n

Philippines

Verified Purchase

5 .0

2026-02-01

Good value fiber optic solution =)

34 Helpful vote Comments

H***h

Philippines

Verified Purchase

5 .0

2025-12-17

Installed these 1550nm-TX/1310nm-RX SFP modules in outdoor network cabinets. The wide temperature support and simplex LC SMF connection make them a reliable choice for harsh environments.

25 Helpful vote Comments

Z***s

New Zealand

Verified Purchase

5 .0

2025-08-22

We use these 1G BiDi SFP 20km modules for connecting remote buildings in our enterprise network. The simplex LC fiber design helped reduce cabling costs, and the optical performance has been stable since installation.

21 Helpful vote Comments

P***e

Taiwan, Province of China

Verified Purchase

5 .0

2025-07-25

Nice optics for enterprise networks ;)

24 Helpful vote Comments

R***s

Singapore

Verified Purchase

5 .0

2025-07-23

Our company needed simplex LC 1G BiDi SFP modules for a building-to-building connection. These 20km SMF optics delivered stable performance with our existing switches.

77 Helpful vote Comments

D***r

United Kingdom

Verified Purchase

5 .0

2025-04-17

We used LS-BL55311G-20I for a campus fiber expansion project. The 1G BiDi SFP 20km transmission works perfectly over our existing single-mode fiber, and DOM monitoring helps our team track signal health remotely.

14 Helpful vote Comments

A***s

Singapore

Verified Purchase

5 .0

2025-03-26

Great option for outdoor cabinets and remote access networks. The industrial temperature range gives us extra confidence compared with standard commercial SFP modules.

66 Helpful vote Comments

E***s

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-03-21

Excellent BiDi SFP module, stable link all day :)

45 Helpful vote Comments

J***n

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-02-20

Reliable module for long-distance fiber connections.

35 Helpful vote Comments

A***h

Sweden

Verified Purchase

5 .0

2025-01-07

Our technicians tested this 1000BASE-BX20 compatible SFP with multiple OEM switches before deployment. Compatibility was excellent and the fiber links came online immediately.

66 Helpful vote Comments

P***r

Netherlands

Verified Purchase

5 .0

2024-12-12

We tested this 1G SFP 20km industrial transceiver in a mixed-brand environment with Cisco and other OEM-compatible equipment. EEPROM coding matched our requirements and deployment was smooth.

49 Helpful vote Comments

A***k

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-10-27

Simple setup, good performance, no complaints.

55 Helpful vote Comments

J***n

Lithuania

Verified Purchase

4 .0

2024-07-07

The module performance is great, but shipping packaging had a small issue. The transceiver arrived working normally and passed our network tests.

23 Helpful vote Comments

J***s

Bangladesh

Verified Purchase

5 .0

2024-06-05

Perfect for remote office and industrial network links =D

94 Helpful vote Comments

J***t

Maldives

Verified Purchase

5 .0

2024-02-13

We deployed over 30 units for telecom backhaul applications. The 20km BiDi SFP transceiver provides stable 1Gbps connectivity, and the DDM function makes troubleshooting much easier for our NOC team.

68 Helpful vote Comments

W***r

Morocco

Verified Purchase

5 .0

2024-02-10

Fast installation and clean diagnostics.

45 Helpful vote Comments

J***n

Russian Federation

Verified Purchase

5 .0

2024-01-25

Good compatibility, low power usage, and stable 1G performance for our fiber infrastructure.

80 Helpful vote Comments

M***s

Canada

Verified Purchase

5 .0

2024-01-23

We installed a large batch of LS-BL55311G-20I modules across several locations. The 20km single-mode fiber transmission distance is accurate, DOM readings are useful, and all units have been running without errors.

11 Helpful vote Comments

A***a

France

Verified Purchase

5 .0

2024-01-16

Affordable alternative to OEM optics.

85 Helpful vote Comments

S***s

Republic of Korea

Verified Purchase

5 .0

2024-01-14

Used these in an industrial Ethernet project. The LS-BL55311G-20I handles temperature changes well and maintains stable optical power levels.

52 Helpful vote Comments

Verified Purchase

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LINK-PP LS-BL49551G-A5I 1G SFP BiDi 1490nm-TX/1550nm-RX 150km DOM Simplex LC SMF Optical Transceiver Module (Industrial)

21 Reviews
|
980 Sold

$ 33 ~~$ 0.00~~

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LINK-PP

LS-BL55491G-60C | 60km

LINK-PP LS-BL55491G-60C 1G SFP BiDi 1550nm-TX/1490nm-RX 60km Simplex LC DOM SMF Optical Transceiver Module

52 Reviews
|
5.2K Sold

$ 33 ~~$ 0.00~~

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LINK-PP

LS-BL49551G-60C | 60km

LINK-PP LS-BL49551G-60C 1G BiDi SFP 1490nm-TX/1550nm-RX 60km DOM Simplex LC SMF Optical Transceiver Module

58 Reviews
|
5.2K Sold

$ 33 ~~$ 0.00~~

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LINK-PP

LS-BL49551G-A5C | 150km

LINK-PP LS-BL49551G-A5C 1G SFP BiDi 1490nm-TX/1550nm-RX 150km DOM Simplex LC SMF Optical Transceiver Module

25 Reviews
|
2.3K Sold

$ 32 ~~$ 0.00~~

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LINK-PP

LS-BL49551G-A2I | 120km

LINK-PP LS-BL49551G-A2I 1G BiDi SFP 1490nm-TX/1550nm-RX 120km DOM Simplex LC SMF Optical Transceiver Module (Industrial)

47 Reviews
|
1.4K Sold

$ 31.5 ~~$ 0.00~~

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LINK-PP

LS-BL55491G-A2I | 120km

LINK-PP LS-BL55491G-A2I 1G SFP BiDi 1550nm-TX/1490nm-RX 120km Simplex LC DOM SMF Optical Transceiver Module (Industrial)

25 Reviews
|
580 Sold

$ 30.05 ~~$ 0.00~~

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LINK-PP

LS-BL49551G-A0I | 100km

LINK-PP LS-BL49551G-A0I 1G BiDi SFP 1490nm-TX/1550nm-RX 100km DOM Simplex LC SMF Optical Transceiver Module (Industrial)

28 Reviews
|
1.1K Sold

$ 29.5 ~~$ 0.00~~

{"pid":478684,"minimum_ordered_quantity":1,"skulist":[{"pskuid":183724,"cid":752,"pid":478684,"sku":"183724","psvid1":271147,"psvid2":271148,"psvid3":0,"psvid4":0,"left_num":890,"price":"29.500","strike_price":"0.000","innercode":"","addtime":"2024-09-23 11:04:37","uptime":"2026-04-14 00:52:22","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"29.5","subtotal":29.5}]}
LINK-PP

LS-BL55491G-A2C | 120km

LINK-PP LS-BL55491G-A2C 1G SFP BiDi 1550nm-TX/1490nm-RX 120km DOM Simplex LC SMF Optical Transceiver Module

41 Reviews
|
890 Sold

$ 29.05 ~~$ 0.00~~

{"pid":476699,"minimum_ordered_quantity":1,"skulist":[{"pskuid":181522,"cid":752,"pid":476699,"sku":"181522","psvid1":269230,"psvid2":269231,"psvid3":0,"psvid4":0,"left_num":3100,"price":"29.050","strike_price":"0.000","innercode":"","addtime":"2024-06-27 10:18:03","uptime":"2024-11-08 00:48:19","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"29.05","subtotal":29.05}]}
LINK-PP

LS-BL49551G-A2C | 120km

LINK-PP LS-BL49551G-A2C 1G SFP BiDi 1490nm-TX/1550nm-RX 120km Simplex LC DOM SMF Optical Transceiver Module

30 Reviews
|
770 Sold

$ 29 ~~$ 0.00~~

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