Does the DOM/DDM telemetry feature continue to report data accurately when operating below freezing?

Yes, the built-in microcontroller is calibrated for industrial extremes, ensuring precise optical diagnostics even at -40°C conditions.

Do I need to match this TX1310/RX1550 module with another identical unit on the far end?

No, it must be paired with its complementary module (TX1550nm/RX1310nm) on the opposite end to complete the bidirectional single-core link.

We need to purchase 500 units for a municipal fiber roll-out. Is there bulk B2B pricing available?

Yes, we offer tiered wholesale discounts for large-scale enterprise deployments. Please contact our sales team to receive a formal custom quotation.

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LINK-PP LS-BL315501-20I 155M SFP BiDi 1310nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: LINK-PP LS-BL315501-20I 155M SFP BiDi 1310nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 205502
Price: 6.45 USD
Availability: InStock
Rating: 4.9 (24 reviews)

# 205502

Product: LINK-PP LS-BL315501-20I 155M SFP BiDi 1310nm-TX/1550nm-RX 20km Simplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 205502
P/N: LS-BL315501-20I
Price: $ 7.5
Stock: 520 in Stock
Sold: 2.5K
Product URL: https://www.l-p.com/products/493982.htm

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Manufacture: LINK-PP

P/N: LS-BL315501-20I

Compatible:: LINK-PP

Compatible P/N:: LS-BL315501-10C | 10km; LS-BL315501-10I | 10km; LS-BL553101-10C | 10km; LS-BL553101-10I | 10km; LS-BL315501-15C | 15km; LS-BL553101-15C | 15km; LS-BL315501-20C | 20km; LS-BL315501-20I | 20km; LS-BL553101-20C | 20km; LS-BL553101-20I | 20km; LS-BL315501-40C | 40km; LS-BL315501-40I | 40km; LS-BL553101-40C | 40km; LS-BL553101-40I | 40km; LS-BL315501-80C | 80km; LS-BL315501-80I | 80km; LS-BL495501-80C | 80km; LS-BL495501-80I | 80km; LS-BL553101-80C | 80km; LS-BL553101-80I | 80km; LS-BL554901-80C | 80km; LS-BL554901-80I | 80km

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LINK-PP LS-BL315501-20I 155M SFP Specifications

LS-BL315501-20I delivers robust 155M SFP BiDi optical transceiver functionality, utilizing an onboard FP laser and PIN photodetector combination to sustain 1310nm-TX/1550nm-RX bidirectional link lengths reaching 20km.

LINK-PP Part Number	LS-BL315501-20I	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	155Mbps
Wavelength	1310nm-TX/1550nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-14 to -8dBm	RX Power	-32 to -6dBm
Receiver Sensitivity	< -32dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: Does the DOM/DDM telemetry feature continue to report data accurately when operating below freezing? By J***l on 2026-04-27

A: Yes, the built-in microcontroller is calibrated for industrial extremes, ensuring precise optical diagnostics even at -40°C conditions. By admin on 2026-04-28
Q: Do I need to match this TX1310/RX1550 module with another identical unit on the far end? By K***n on 2025-09-24

A: No, it must be paired with its complementary module (TX1550nm/RX1310nm) on the opposite end to complete the bidirectional single-core link. By admin on 2025-09-25
Q: We need to purchase 500 units for a municipal fiber roll-out. Is there bulk B2B pricing available? By I***t on 2025-04-13

A: Yes, we offer tiered wholesale discounts for large-scale enterprise deployments. Please contact our sales team to receive a formal custom quotation. By admin on 2025-04-14

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P***n

Sweden

Verified Purchase

5 .0

2026-04-24

We deploy these 155M single-mode transceiver modules in northern outdoor hubs. Temperature drops way below freezing, but these industrial optics maintain a highly stable laser emission. Simplex LC saves us massive fiber splice time.

80 Helpful vote Comments

I***e

United Kingdom

Verified Purchase

5 .0

2026-04-10

Replacing old dual-fiber links with this 155M 20km single-mode SFP module. No complaints.

109 Helpful vote Comments

A***e

Denmark

Verified Purchase

4 .0

2026-04-07

The 155M BiDi SFP transceivers themselves work beautifully in our industrial switches and the DOM metrics are highly accurate, but our delivery was delayed by two days at the local courier sorting hub. It caused a minor scheduling conflict for our deployment team. The hardware is perfect, but I recommend ordering a week in advance to cushion against local logistics hiccups.

21 Helpful vote Comments

Y***e

Japan

Verified Purchase

5 .0

2026-03-28

Managing the communications infrastructure for a major urban transit grid demands an incredibly strict qualification process for any third-party network component, and we subjected a sample batch of LINK-PP LS-BL315501-20I wholesale units to rigorous laboratory validation. The manufacturing tolerances on these transceivers are exceptional; the cast metal housing is precisely machined to slide smoothly into standard SFP cages while providing superior electrical grounding to minimize electromagnetic interference (EMI) near high-voltage lines. Our automated test benches confirmed that the 1310nm transmitter and 1550nm receiver run precisely within their defined spectral widths, producing a clean, wide-open optical eye diagram with excellent signal integrity over the full 20km single-mode fiber distance. Having a highly consistent, MSA-compliant factory supplier allows our enterprise to drastically reduce capital expenditures while maintaining absolute operational safety and network reliab

89 Helpful vote Comments

C***r

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2026-03-23

Saved half our fiber budget using these BiDi SFP 1310nm TX 1550nm RX optics on single-core lines!

92 Helpful vote Comments

N***y

India

Verified Purchase

5 .0

2026-03-11

Our facility runs hot in certain outdoor enclosures, so standard commercial optics are a no-go. This industrial single-mode SFP 20km works flawlessly up to its rated limits. The DDM/DOM data is highly accurate when checked against our hardware console. Top marks.

102 Helpful vote Comments

S***e

Indonesia

Verified Purchase

5 .0

2026-02-20

We ordered LINK-PP LS-BL315501-20I wholesale for a major rail transit signaling project. The build quality of the metal housing is superb and provides great ESD protection. Every unit passed our internal QC loop with zero jitter issues.

41 Helpful vote Comments

G***d

Cambodia

Verified Purchase

5 .0

2026-02-13

Industrial-grade 155M SFP BiDi transceiver running smoothly inside a harsh 65°C power substation cabinet.

53 Helpful vote Comments

W***r

Finland

Verified Purchase

5 .0

2026-01-30

In the industrial automation and energy distribution sector, commercial-grade electronics are completely out of the question due to thermal stress, which is why we deployed a fleet of these industrial-grade 155M SFP transceivers across our uncooled roadside power distribution cabinets and wind turbine nodes. Our primary operational hurdle was finding a transceiver that could survive winter freezes and high-heat summer spikes inside sealed metal enclosures, and this module has proven its true industrial-grade rating over four months of continuous field operations. Monitoring the internal diagnostic telemetry via DDM reveals that the laser bias current remains exceptionally stable with zero wavelength drift on either the 1310nm TX or 1550nm RX channels despite massive ambient temperature fluctuations. The mechanical Simplex LC interface provides an exceptionally tight, dust-resistant latching fit that handles heavy equipment vibration effortlessly, delivering a highly engineered product

131 Helpful vote Comments

L***e

Italy

Verified Purchase

5 .0

2026-01-03

Fantastic option if you need to double your capacity on a single strand. This 155M SFP BiDi 1310nm-TX/1550nm-RX 20km module has built-in DOM which made tuning our Tx power very straightforward during commissioning. Will definitely put LINK-PP on our preferred vendor list.

108 Helpful vote Comments

J***f

Japan

Verified Purchase

5 .0

2025-12-21

We ordered a batch of these Simplex LC 155M SFP optical transceiver modules for a municipal fiber network expansion. LINK-PP nailed the compatibility with our legacy gear. TX 1310nm and RX 1550nm signals are well within normal attenuation limits over 18km of field fiber. Cheers!

151 Helpful vote Comments

Z***n

Spain

Verified Purchase

4 .0

2025-12-10

The LS-BL315501-20I supplier delivered the optics a day later than expected due to a customs delay, which caused a bit of scheduling hassle for our field crew. However, the 155M BiDi SFP transceivers themselves work beautifully in our switches. Great DOM features and solid metal build. Just order with a few days of cushion for shipping!

35 Helpful vote Comments

B***m

Sweden

Verified Purchase

4 .0

2025-11-30

The courier service required an unexpected regional signature authorization at our customs border, which pushed the arrival time back by 24 hours. Once these 155M SFP transceivers arrived, they performed flawlessly inside our freezing sub-zero outdoor cabinets, and the real-time SNMP data is incredibly precise. The modules are great; just be prepared for occasional import paperwork delays.

12 Helpful vote Comments

A***n

Macao

Verified Purchase

5 .0

2025-11-27

Perfect industrial-grade 20km single-mode SFP for our extreme weather roadside cabinets!

59 Helpful vote Comments

U***n

Hong Kong

Verified Purchase

5 .0

2025-11-04

You can't beat the LINK-PP SFP transceiver pricing for an industrial broad-temperature range module. We tested it alongside OEM parts that cost three times more, and the performance is completely identical. Perfect for single-mode fiber optimization.

95 Helpful vote Comments

O***y

Israel

Verified Purchase

5 .0

2025-10-05

Highly efficient BiDi SFP 1310nm TX 1550nm RX module. We saved a lot on fiber leasing fees by upgrading to simplex links. It is completely plug-and-play on our switches without forcing any special port configurations. Very pleased with this purchase.

94 Helpful vote Comments

B***e

Morocco

Verified Purchase

5 .0

2025-09-11

Plugged into an old Fast Ethernet backbone and DOM readings are spot on. Great price! (^_^)

83 Helpful vote Comments

T***k

Hungary

Verified Purchase

5 .0

2025-09-02

Perfect 20km BiDi single-mode SFP for industrial PLC networking. It handles the 155M Fast Ethernet standard without any frame drops. Simplex LC connector locks with a solid click. Will buy again for next campus upgrade.

116 Helpful vote Comments

V***f

France

Verified Purchase

5 .0

2025-08-25

We recently completed a massive fiber consolidation project across a distributed industrial park where fiber core exhaustion was our primary roadblock, as laying new single-mode fiber cables would have decimated our budget. We opted to migrate our legacy 155Mbps Fast Ethernet monitoring links to single-strand infrastructure using this 155M SFP BiDi 1310nm-TX/1550nm-RX transceiver module, and the deployment has been stellar. We paired this module with its matching counterpart on the remote end, ran a 48-hour continuous Bit Error Rate Test (BERT) over an 18.5km fiber span with multiple patch panels, and returned zero frame losses or CRC errors. The digital optical monitoring (DOM) integration via CLI works seamlessly with our multi-vendor core infrastructure, allowing our NOC to poll real-time metrics like TX/RX power, internal module temperature, and supply voltage via SNMP, making these optics a bulletproof, cost-effective solution for any network engineer managing long-reach legacy te

114 Helpful vote Comments

M***t

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-07-29

Using these industrial grade SFP transceiver 155M units inside wind turbine control panels. They experience a lot of vibration and wide temperature swings, but the Simplex LC latch holds exceptionally tight. No CRC or alignment errors on the Fast Ethernet links so far. Great work.

72 Helpful vote Comments

H***d

Republic of Korea

Verified Purchase

5 .0

2025-06-28

Highly stable 155M 20km BiDi optic Simplex LC for our FTTH long-reach access links. Recommended! d(^_^)b

67 Helpful vote Comments

X***k

Sweden

Verified Purchase

5 .0

2025-06-14

Managing critical out-of-band management links for remote electrical substations in northern regions requires network components that can withstand sub-zero arctic environments, which is why we standardized on this industrial 155M single-mode SFP transceiver. Advanced telemetry is vital for our operations, and the DOM functions on these modules interface seamlessly with our automated SNMP monitoring platform, giving our central NOC real-time visibility into laser temperature, TX power, and optical receive levels. Even when external temperatures cratered to -35°C last winter, the internal bias and heating compensation algorithms of these industrial optics kept the optical output within a fraction of a decibel of its baseline measurement. The Simplex LC layout allowed us to double our available capacity inside tight, space-constrained outdoor patch panels, providing an exceptionally reliable product for high-consequence utility networks where on-site maintenance trips are incredibly cost

97 Helpful vote Comments

R***k

Ireland

Verified Purchase

5 .0

2025-05-09

Needed a reliable 20km 155M BiDi SFP optical module for a regional telemetry link. Plugged this module in, link light came up instantly, and DOM metrics showed perfectly safe Rx levels. LINK-PP continues to dominate the cost-to-performance ratio.

85 Helpful vote Comments

F***e

Lithuania

Verified Purchase

5 .0

2025-04-11

Solid build, digital optical monitoring works perfectly via SNMP. Real life-saver.

74 Helpful vote Comments