Is this 2.5G SFP BiDi industrial module compatible with standard 2.5G Ethernet switches that do not feature dedicated industrial-rated SFP slots?

Yes, it is fully backward-compatible with standard commercial SFP/SFP+ slots that support 2.5Gbps data rates; the industrial rating simply ensures the optic itself will not degrade or fail when subjected to extreme environmental conditions outside climate-controlled server rooms.

What precautions should field technicians take regarding optical power levels when testing this 40km industrial BiDi module on a short bench patch cord?

Because the transmitter output is engineered to penetrate up to 40km of single-mode fiber, direct back-to-back testing on a short patch cable without an inline optical attenuator (10dB to 15dB recommended) risks saturating or permanently damaging the sensitive PIN photodiode receiver.

How does extreme low-temperature exposure (-40°C) affect the DDM/DOM optical power readouts on this specific transceiver model?

The module features temperature-compensated circuitry compliant with SFF-8472, ensuring that digital diagnostic monitoring (DDM) readouts for optical transmit/receive power, bias current, and internal operating temperature remain accurate throughout the entire -40°C to +85°C range.

Does this industrial BiDi module require an external optical diplexer or filter when connecting to a single-strand optical line?

No external optical filters are needed; the internal optical diplexer inside the SFP module automatically separates the 1310nm transmit wavelength from the incoming 1550nm receive wavelength over the single LC fiber interface.

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LINK-PP LS-BL31552G-40I 2.5G SFP BiDi 1310nm-TX/1550nm-RX 40km DOM Simplex LC SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-BL31552G-40I 2.5G SFP BiDi 1310nm-TX/1550nm-RX 40km DOM Simplex LC SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 193664
Price: 10.148 USD
Availability: InStock
Rating: 4.9 (49 reviews)

# 193664

Product: LINK-PP LS-BL31552G-40I 2.5G SFP BiDi 1310nm-TX/1550nm-RX 40km DOM Simplex LC SMF Optical Transceiver Module (Industrial)
SKU: 193664
P/N: LS-BL31552G-40I
Price: $ 11.8
Stock: 509 in Stock
Sold: 290
Product URL: https://www.l-p.com/products/485596.htm

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Manufacture: LINK-PP

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Compatible:: LINK-PP

Compatible P/N:: LS-BL31492G-10C | 10km; LS-BL49312G-10C | 10km; LS-BL31492G-20C | 20km; LS-BL31492G-20I | 20km; LS-BL31552G-20C | 20km; LS-BL31552G-20I | 20km; LS-BL49312G-20C | 20km; LS-BL49312G-20I | 20km; LS-BL55312G-20C | 20km; LS-BL55312G-20I | 20km; LS-BL31552G-40C | 40km; LS-BL31552G-40I | 40km; LS-BL55312G-40C | 40km; LS-BL55312G-40I | 40km

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LINK-PP LS-BL31552G-40I 2.5G SFP BiDi Specifications

The LINK-PP LS-BL31552G-40I 2.5G SFP BiDi module enables bidirectional 2.5Gbps transmission over a single-mode fiber link for up to 40km, which lowers infrastructure costs. It delivers reliable optical performance through a 1310nm transmit and 1550nm receive wavelength pair, supporting stable, efficient long-distance connectivity.

LINK-PP Part Number	LS-BL31552G-40I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	2.5Gbps
Wavelength	1310nm-TX/1550nm-RX	Max Cable Distance	40km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-2 to +4dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-20dBm	Receiver Overload	-1dBm
Operating Temperature Range	-40 to 85°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: Is this 2.5G SFP BiDi industrial module compatible with standard 2.5G Ethernet switches that do not feature dedicated industrial-rated SFP slots? By R***r on 2025-08-23

A: Yes, it is fully backward-compatible with standard commercial SFP/SFP+ slots that support 2.5Gbps data rates; the industrial rating simply ensures the optic itself will not degrade or fail when subjected to extreme environmental conditions outside climate-controlled server rooms. By admin on 2025-08-23
Q: What precautions should field technicians take regarding optical power levels when testing this 40km industrial BiDi module on a short bench patch cord? By L***k on 2025-03-30

A: Because the transmitter output is engineered to penetrate up to 40km of single-mode fiber, direct back-to-back testing on a short patch cable without an inline optical attenuator (10dB to 15dB recommended) risks saturating or permanently damaging the sensitive PIN photodiode receiver. By admin on 2025-03-30
Q: How does extreme low-temperature exposure (-40°C) affect the DDM/DOM optical power readouts on this specific transceiver model? By J***h on 2024-07-06

A: The module features temperature-compensated circuitry compliant with SFF-8472, ensuring that digital diagnostic monitoring (DDM) readouts for optical transmit/receive power, bias current, and internal operating temperature remain accurate throughout the entire -40°C to +85°C range. By admin on 2024-07-07
Q: Does this industrial BiDi module require an external optical diplexer or filter when connecting to a single-strand optical line? By P***n on 2024-03-24

A: No external optical filters are needed; the internal optical diplexer inside the SFP module automatically separates the 1310nm transmit wavelength from the incoming 1550nm receive wavelength over the single LC fiber interface. By admin on 2024-03-24

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S***z

India

Verified Purchase

4 .0

2026-07-22

The 2.5G BiDi optic works flawlessly across our 36km outdoor link, though the cardboard box was slightly creased during international transit. =/

75 Helpful vote Comments

F***s

United States

Verified Purchase

5 .0

2026-05-31

Replaced standard commercial optics with these industrial-grade LINK-PP transceivers for rail monitoring systems. The ruggedized housing and sturdy duplex-to-simplex LC mechanical latch hold firm despite heavy track vibrations nearby.

84 Helpful vote Comments

S***s

Bulgaria

Verified Purchase

5 .0

2026-05-21

Unbeatable performance.

14 Helpful vote Comments

E***n

Hungary

Verified Purchase

5 .0

2026-05-15

Link up a remote security gate house to our main industrial facility over 28km SMF. Upgraded throughput from 1G to 2.5G instantly while sharing a single fiber core with existing telemetry equipment. =D

4 Helpful vote Comments

R***z

Belgium

Verified Purchase

5 .0

2026-05-14

Upgraded wireless backhaul antennas in a mountain pass. The 1310nm transmitter punch easily reaches our target 35km distance while drawing minimal power from our solar battery setup. ;)

10 Helpful vote Comments

Z***n

Austria

Verified Purchase

5 .0

2026-05-10

Excellent choice for extending single-strand fiber backhaul in unheated remote cabinets. The -40°C to 85°C industrial operating temperature range handles extreme seasonal drops without optical frequency drift. =D

40 Helpful vote Comments

H***s

Netherlands

Verified Purchase

5 .0

2026-04-24

Installed this industrial 2.5G BiDi module in a harsh desert weather station enclosure. Even when temperatures spiked above 70°C inside the steel box, the 1310nm-TX signal output remained steady with zero thermal throttling. :)

66 Helpful vote Comments

C***e

Spain

Verified Purchase

5 .0

2026-04-09

Slotted right into a ruggedized Siemens industrial switch. Locked in at 2.5Gbps full duplex over a simplex LC SMF connection instantly without requiring command-line override hacks. ;)

66 Helpful vote Comments

B***l

Ireland

Verified Purchase

5 .0

2026-03-03

Verified compatible across multi-vendor switch stacks including Mikrotik, Netgear, and Ubiquiti outdoor switches. Zero frame drops recorded during winter storm tests. =)

8 Helpful vote Comments

K***n

Sweden

Verified Purchase

5 .0

2026-02-18

Five stars.

99 Helpful vote Comments

M***s

Russian Federation

Verified Purchase

5 .0

2026-02-18

Highly durable.

36 Helpful vote Comments

D***h

Singapore

Verified Purchase

5 .0

2026-01-04

Industrial beast!

1 Helpful vote Comments

T***k

Poland

Verified Purchase

5 .0

2025-12-20

Top-grade 2.5G 40km BiDi optic! Real-time DOM monitoring telemetry gives accurate power level readings across extreme temperature swings. :-D

89 Helpful vote Comments

N***a

Bangladesh

Verified Purchase

5 .0

2025-11-28

Tested in extreme heat environments alongside Moxa and Cisco industrial Ethernet hardware. Hot-pluggable design let us swap out aging 1G units on a live network ring without dropping adjacent node traffic. =)

44 Helpful vote Comments

H***l

Turkey

Verified Purchase

5 .0

2025-11-16

Solid construction.

37 Helpful vote Comments

H***n

United Kingdom

Verified Purchase

5 .0

2025-09-04

Best cost-effective solution for industrial 2.5G BiDi deployment on single-strand fiber networks. Plugs into generic SFP ports and reports clean DDM metrics every time. :-D

71 Helpful vote Comments

V***s

Spain

Verified Purchase

5 .0

2025-06-27

Upgraded our traffic management camera network over a 33km single-mode fiber run. Using this industrial 2.5G SFP BiDi transceiver allowed us to double bandwidth per pole without running new glass. The DFB laser and PIN receiver combination handles link loss across dirty patch panels seamlessly!

67 Helpful vote Comments

M***n

Poland

Verified Purchase

5 .0

2025-03-28

They have always provided me with very good service and excellent products.I will very definitely shop there again.

18 Helpful vote Comments

S***t

Russian Federation

Verified Purchase

5 .0

2024-12-30

Ultimate reliability.

76 Helpful vote Comments

S***s

Italy

Verified Purchase

5 .0

2024-12-30

I'm satisfied with the price, more surprisingly, the quality is better than I imagined. l-p.com I will do more business with you in the future~

87 Helpful vote Comments

R***n

United States

Verified Purchase

5 .0

2024-12-18

Product is good, but not entirely as advertised!

19 Helpful vote Comments

L***z

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-11-29

Built tough.

51 Helpful vote Comments

J***n

Ireland

Verified Purchase

5 .0

2024-11-13

Excellent as always, price, shipping and service perfect

85 Helpful vote Comments

E***s

South Africa

Verified Purchase

5 .0

2024-11-03

Deployed a dozen units for a rural WISP tower feed expansion. Operating a single-strand 1310nm-TX/1550nm-RX link cut our dark fiber leasing costs in half. Integrated SFF-8472 digital diagnostic monitoring made remote link budget auditing via SNMP super painless. :-D

20 Helpful vote Comments

M***n

Sweden

Verified Purchase

5 .0

2024-10-26

Nothing to complain, except the slow delivery. Hope it would be Faster the next time.

69 Helpful vote Comments

S***s

Mexico

Verified Purchase

4 .0

2024-10-03

The module performance in freezing conditions is rock solid, but UPS delayed delivery by two days due to weather. Luckily the inner anti-static tray kept the simplex LC port dust cap intact.

86 Helpful vote Comments

W***r

Maldives

Verified Purchase

5 .0

2024-09-17

I have googled much about Link-pp, and most buyers gave good reviews. Their website is excellent.

7 Helpful vote Comments

R***e

India

Verified Purchase

5 .0

2024-09-04

Flawless connection.

27 Helpful vote Comments

N***e

Finland

Verified Purchase

5 .0

2024-07-27

Perfect match.

68 Helpful vote Comments

G***n

France

Verified Purchase

5 .0

2024-07-26

I bought these ethernet port to connect our switches for Poc test. there is no any issue. very great~

83 Helpful vote Comments

O***e

Spain

Verified Purchase

5 .0

2024-07-08

Price was good. Delivery was Fast. Quality appears to be good. I would definitely recommend this site.

12 Helpful vote Comments

L***r

Austria

Verified Purchase

5 .0

2024-05-25

The website was easy to order, the delivery service was Fast and arrived before time. Customer service was friendly and helpful. Would recommend this site to my friends. I also found that they provide solutions, which is very useful for me. Highly recommend

26 Helpful vote Comments

A***z

Poland

Verified Purchase

5 .0

2024-05-21

Fully SFP MSA compliant with outstanding EMI resistance. Ran 72-hour continuous packet flood tests near high-voltage industrial motors and recorded zero bit error rate spikes. :)

65 Helpful vote Comments

J***z

Hungary

Verified Purchase

5 .0

2024-05-18

Outstanding value!

78 Helpful vote Comments

C***r

Italy

Verified Purchase

5 .0