What SFF diagnostic standards are used for DDM readouts on this BiDi module, and can I read transmit power levels via SNMP?

The module integrates Digital Diagnostics Monitoring (DDM/DOM) in full compliance with SFF-8472, enabling real-time monitoring of TX output power, RX input power, laser bias current, module supply voltage, and internal temperature via standard switch SNMP MIBs.

Does the 40km distance rating require a minimum fiber optical attenuation or optical attenuator for short-distance testing on a bench?

Yes, because the optical transmitter is calibrated for long-reach 40km spans, connecting this module directly on a short patch cable (e.g., under 5km) without an optical attenuator (typically 5dB to 10dB) may saturate or damage the sensitive optical receiver.

How do I select the correct counter-part optical module to pair with this 1310nm-TX / 1550nm-RX BiDi transceiver on a single fiber strand?

To establish a functional link over a single fiber strand, the opposite end of the fiber link must use a complementary BiDi module that transmits at 1550nm and receives at 1310nm (1550nm-TX / 1310nm-RX 2.5G BiDi SFP 40km).

Will this simplex LC BiDi module work with APC (Angled Physical Contact) polished fiber jumpers or only UPC/PC polished jumpers?

The optical interface uses a standard blue Simplex LC/UPC connector. For optimal optical return loss and minimal insertion loss, it should be connected to LC/UPC polished single-mode fiber patch cables rather than green LC/APC connectors.

Can this 2.5G SFP BiDi transceiver auto-negotiate down to standard 1Gbps or 100Mbps speeds on legacy switch ports?

No, this module operates at a fixed data rate of 2.5Gbps (SONET OC-48 / 2.5G Ethernet). Both the switch port and the optic on the far end must support native 2.5G rate for the link to negotiate and establish connection.

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

Name: LINK-PP LS-BL31552G-40C 2.5G SFP BiDi 1310nm-TX/1550nm-RX 40km DOM Simplex LC SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 193624
Price: 9.116 USD
Availability: InStock
Rating: 5 (51 reviews)

# 193624

Product: LINK-PP LS-BL31552G-40C 2.5G SFP BiDi 1310nm-TX/1550nm-RX 40km DOM Simplex LC SMF Optical Transceiver Module
SKU: 193624
P/N: LS-BL31552G-40C
Price: $ 10.6
Stock: 325 in Stock
Sold: 185
Product URL: https://www.l-p.com/products/485571.htm

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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-40C 2.5G SFP BiDi Specifications

The LINK-PP LS-BL31552G-40C 2.5G SFP BiDi module cuts infrastructure costs by enabling bidirectional 2.5Gbps data transmission over single-mode fiber for up to 40km. It achieves this through dependable optical performance, employing a 1310nm transmit and 1550nm receive wavelength to deliver stable, high-efficiency connectivity.

LINK-PP Part Number	LS-BL31552G-40C	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	0 to 70°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: What SFF diagnostic standards are used for DDM readouts on this BiDi module, and can I read transmit power levels via SNMP? By R***r on 2026-05-04

A: The module integrates Digital Diagnostics Monitoring (DDM/DOM) in full compliance with SFF-8472, enabling real-time monitoring of TX output power, RX input power, laser bias current, module supply voltage, and internal temperature via standard switch SNMP MIBs. By admin on 2026-05-05
Q: Does the 40km distance rating require a minimum fiber optical attenuation or optical attenuator for short-distance testing on a bench? By A***n on 2026-02-26

A: Yes, because the optical transmitter is calibrated for long-reach 40km spans, connecting this module directly on a short patch cable (e.g., under 5km) without an optical attenuator (typically 5dB to 10dB) may saturate or damage the sensitive optical receiver. By admin on 2026-02-27
Q: How do I select the correct counter-part optical module to pair with this 1310nm-TX / 1550nm-RX BiDi transceiver on a single fiber strand? By C***s on 2025-01-17

A: To establish a functional link over a single fiber strand, the opposite end of the fiber link must use a complementary BiDi module that transmits at 1550nm and receives at 1310nm (1550nm-TX / 1310nm-RX 2.5G BiDi SFP 40km). By admin on 2025-01-17
Q: Will this simplex LC BiDi module work with APC (Angled Physical Contact) polished fiber jumpers or only UPC/PC polished jumpers? By H***k on 2024-12-14

A: The optical interface uses a standard blue Simplex LC/UPC connector. For optimal optical return loss and minimal insertion loss, it should be connected to LC/UPC polished single-mode fiber patch cables rather than green LC/APC connectors. By admin on 2024-12-14
Q: Can this 2.5G SFP BiDi transceiver auto-negotiate down to standard 1Gbps or 100Mbps speeds on legacy switch ports? By E***s on 2024-03-19

A: No, this module operates at a fixed data rate of 2.5Gbps (SONET OC-48 / 2.5G Ethernet). Both the switch port and the optic on the far end must support native 2.5G rate for the link to negotiate and establish connection. By admin on 2024-03-20

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A***r

Thailand

Verified Purchase

5 .0

2026-05-13

Works effortlessly.

40 Helpful vote Comments

G***e

Argentina

Verified Purchase

5 .0

2026-02-24

Ideal choice!

3 Helpful vote Comments

E***n

United Kingdom

Verified Purchase

5 .0

2026-02-12

Plugged into our FS and TP-Link switches for building-to-building links. Hot-pluggable design allowed live insertion without disrupting existing backhaul traffic on adjacent switch ports. =)

92 Helpful vote Comments

S***l

Argentina

Verified Purchase

5 .0

2026-02-08

Perfect for our wireless WISP backhaul expansion. The simplex LC SMF connector latch locks in firmly, which is critical for remote outdoor cabinets subjected to wind vibration. ;)

100 Helpful vote Comments

N***t

Bangladesh

Verified Purchase

5 .0

2026-01-27

Installed into a Ubiquiti EdgeSwitch SFP port. Synced up immediately at 2.5Gbps using simplex LC SMF with zero configuration tweaks needed. ;)

46 Helpful vote Comments

S***r

Republic of Korea

Verified Purchase

5 .0

2026-01-25

Highly reliable.

88 Helpful vote Comments

E***a

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2026-01-25

Instant upgrade.

59 Helpful vote Comments

T***z

Finland

Verified Purchase

5 .0

2026-01-08

Perfect solution for upgrading GPON/EPON tower feeds to 2.5G speed. The 1310nm-TX and 1550nm-RX wavelength pairing worked right out of the packaging with the matching 1550nm-TX counter-module. =D

42 Helpful vote Comments

C***n

Poland

Verified Purchase

4 .0

2025-12-27

Optic locked in at 2.5G over a 35km single fiber span without issues, though the order took three extra days to clear local customs clearance. =/

54 Helpful vote Comments

Z***g

Ireland

Verified Purchase

5 .0

2025-12-21

Replaced our old 1G SFP links with these 2.5G BiDi modules across a 32km single-mode fiber link connecting two broadcast towers. Link attenuation on the simplex LC connection is surprisingly low, and line-rate traffic flows smoothly without any dropped frames during high-bitrate video streams. Truly top tier engineering!

2 Helpful vote Comments

N***r

Indonesia

Verified Purchase

5 .0

2025-09-19

Fully compliant with SFP MSA standards. We ran 48-hour continuous traffic soak tests in a hot computer room, and the module maintained ultra-stable optical power output without overheating. :)

75 Helpful vote Comments

E***e

Turkey

Verified Purchase

5 .0

2025-09-17

Superb BiDi optic.

93 Helpful vote Comments

J***s

Hungary

Verified Purchase

5 .0

2025-09-04

Flawless performance.

80 Helpful vote Comments

D***n

Italy

Verified Purchase

5 .0

2025-05-25

Top quality product at a low price.

55 Helpful vote Comments

E***l

Netherlands

Verified Purchase

5 .0

2025-03-30

Fast delivery.

9 Helpful vote Comments

A***h

Nepal

Verified Purchase

5 .0

2025-03-22

Deployed across multiple multi-vendor switch topologies including Cisco, Brocade, and HPE. Recognized instantly as a compatible 2.5G SFP optical transceiver without needing forced speed overrides. =)

87 Helpful vote Comments

A***r

Turkey

Verified Purchase

5 .0

2025-03-06

Best budget-friendly 2.5G BiDi single-strand optical transceiver on the market for regional ISP deployments. :)

96 Helpful vote Comments

O***g

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-02-21

Good price, Fast service. I like the site/store

35 Helpful vote Comments

B***s

New Zealand

Verified Purchase

5 .0

2025-01-29

High compatibility, real world testing shows no difference in Speed compared to Belfuse original parts.

51 Helpful vote Comments

H***r

Poland

Verified Purchase

5 .0

2025-01-12

Wanted some Sfp Cage for business use. I had some issues about the item and give them a email, then received great advice and suggestions. No sales pressure at all. Very pleased with both the product and service from Link-pp.

19 Helpful vote Comments

P***w

Ukraine

Verified Purchase

5 .0

2025-01-08

Good price, transaction process good and timely, received exactly what was ordered, and shipped quickly and arrived with no issues. Pleasant purchasing experience all around, would definitely use again.

86 Helpful vote Comments

J***a

United States

Verified Purchase

5 .0

2024-12-15

This company is great and does excellent work!

21 Helpful vote Comments

A***h

Taiwan, Province of China

Verified Purchase

4 .0

2024-12-10

The optic performance is outstanding on our Mikrotik router, but DHL dropped the package off at our front gate in the rain. Thankfully the sealed plastic bag inside kept the simplex LC dust cap dry.

32 Helpful vote Comments

R***o

Belgium

Verified Purchase

5 .0

2024-11-25

very happy with the purchases at fs.com and grateful for the good work!

98 Helpful vote Comments

I***i

Singapore

Verified Purchase

5 .0

2024-11-15

The price for the item I purchased was excellent.

48 Helpful vote Comments

K***n

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-11-07

Top quality.

73 Helpful vote Comments

H***a

Spain

Verified Purchase

5 .0

2024-10-28

These Sfp Cage are cheaper than other stores, but the quality don't let me down. Highly recommend!

80 Helpful vote Comments

F***g

Belarus

Verified Purchase

5 .0

2024-10-26

Reliable link over 40km SMF fiber. Saved us a massive amount of physical cabling labor! =D

100 Helpful vote Comments

I***g

Belarus

Verified Purchase

5 .0

2024-09-16

Smooth install.

70 Helpful vote Comments

A***r

United Arab Emirates

Verified Purchase

5 .0

2024-08-31

great website, good prices....very happy

82 Helpful vote Comments

M***c

United States

Verified Purchase

5 .0

2024-08-14

The items arrived in a timely manner.Great!

36 Helpful vote Comments

C***l

Philippines

Verified Purchase

5 .0

2024-08-13

Bought 10 units for a municipal surveillance network deployment. Running 2.5G Ethernet streams over single strand SMF saved us from laying additional fiber cables through urban ducts. SFF-8472 digital diagnostic monitoring makes fiber attenuation troubleshooting effortless. :-D

95 Helpful vote Comments

A***n

Republic of Korea

Verified Purchase

5 .0

2024-08-11

Saved us thousands in dark fiber leasing fees! Doubled our capacity over a single strand of fiber between our suburban branch offices using these 2.5G BiDi SFP transceivers. :)

100 Helpful vote Comments

L***y

Iran, Islamic Republic of

Verified Purchase

5 .0

2024-08-09

Upgraded a long-haul 2.5G link across a 30km campus single-mode fiber loop. The DFB laser transmitter delivers a strong signal and pairs flawlessly with the 1550nm-TX downstream unit. :-D

69 Helpful vote Comments

N***s

India

Verified Purchase

5 .0

2024-07-31

Set up a 2.5G high-speed NAS link between two office buildings using a single unused fiber strand. Throughput was instantly doubled compared to our old 1G setup, and disk backup jobs completed in half the time. =D

88 Helpful vote Comments

K***g

Brazil

Verified Purchase

5 .0

2024-07-05

Use this one in my device, never had a problem. Buy more for test & spare use

3 Helpful vote Comments

D***a

Italy

Verified Purchase

5 .0

2024-06-30

Yes, we have received the package and it arrived earlier than previously indicated, thank you for marking it as urgent.The package was in excellent condition.

33 Helpful vote Comments

C***s

Austria

Verified Purchase

5 .0

2024-06-24

Excellent purchase!

48 Helpful vote Comments

N***s

Spain

Verified Purchase

5 .0

2024-06-22

We used these 2.5G 40km BiDi SFP transceivers to upgrade bandwidth between our central data closet and remote security gate houses. The DDM/DOM telemetry gives accurate live readings for optical loss and internal laser operating temperature.

73 Helpful vote Comments

W***r

Philippines

Verified Purchase

5 .0

2024-06-09

Glad I found the site. Good selection and price.

43 Helpful vote Comments