Can this 1550nm SFP really support an 80km fiber link?

Yes. The LS-SM551G-80C is specified for up to 80km over single-mode fiber at 1550nm, with a 1.25Gbps maximum data rate. Actual link distance depends on the fiber plant, connectors, splices, and overall optical loss budget.

What type of fiber and connector should I use with this module?

It uses single-mode fiber (SMF) and a Duplex LC interface. The transmitter is a 1550nm DFB laser and the receiver uses a PIN photodetector.

Can I use this in an industrial or outdoor cabinet?

If your application requires the industrial temperature range, specify the industrial version （such as LS-SM551G-80I) when ordering rather than assuming the standard LS-SM551G-80C has the extended range.

Does it support DOM, and which switch brands can I order it coded for?

Yes, the LS-SM551G-80C supports DOM and SFF-8472 digital diagnostics. The product page lists compatibility with Cisco, Arista, Aruba, Juniper, HPE, Dell, Fortinet, NVIDIA/Mellanox and other platforms. For a specific switch model, confirm the required OEM coding before placing a bulk order.

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HW SFP-1.25G-ZX70 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module

Name: HW SFP-1.25G-ZX70 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 223277
Price: 15.738 USD
Availability: InStock
Rating: 4.9 (34 reviews)

# 223277

Product: HW SFP-1.25G-ZX70 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module
SKU: 223277
P/N: LS-SM551G-80C
Price: $ 18.3
Stock: 2916 in Stock
Sold: 2.9K
Product URL: https://www.l-p.com/products/478026.htm

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P/N: LS-SM551G-80C

Compatible:: Cisco; LINK-PP; Adtran; Alcatel-Lucent; Allied Telesis; Arista; Aruba; Avago; Avaya; Brocade; Calix; Ciena; D-Link; DELL; Extreme; FS; Fortinet; Generic; H3C; HPE H3C; HPE ProCurve; HW; IBM; Intel; Juniper; NVIDIA/Mellanox; Netgear; ProCurve; SMC; SMC Networks; TRENDnet

Compatible P/N:: SFP-1.25G-LX10 | 10km; SFP-GE-LX-SM1310 | 10km; SFP-1.25G-LH40 | 40km; SFP-GE-LH40-SM1550 | 40km; SFP-1.25G-ZX70 | 80km

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HW SFP-1.25G-ZX70 Compatible LINK-PP 1G SFP Specifications

The HW SFP-1.25G-ZX70 Compatible LINK-PP SFP transceiver delivers consistent 1.25Gbps connectivity over single-mode fiber distances of up to 80km at a wavelength of 1550nm, guaranteeing full LINK-PP compatibility.

HW Part Number	SFP-1.25G-ZX70	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm	Max Cable Distance	80km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	0 to +5dBm	RX Power	-26 to -1dBm
Receiver Sensitivity	<-26dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

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Q: Can this 1550nm SFP really support an 80km fiber link? By N***s on 2026-05-04

A: Yes. The LS-SM551G-80C is specified for up to 80km over single-mode fiber at 1550nm, with a 1.25Gbps maximum data rate. Actual link distance depends on the fiber plant, connectors, splices, and overall optical loss budget. By admin on 2026-05-05
Q: What type of fiber and connector should I use with this module? By H***r on 2025-02-21

A: It uses single-mode fiber (SMF) and a Duplex LC interface. The transmitter is a 1550nm DFB laser and the receiver uses a PIN photodetector. By admin on 2025-02-21
Q: Can I use this in an industrial or outdoor cabinet? By C***k on 2024-08-21

A: If your application requires the industrial temperature range, specify the industrial version （such as LS-SM551G-80I) when ordering rather than assuming the standard LS-SM551G-80C has the extended range. By admin on 2024-08-21
Q: Does it support DOM, and which switch brands can I order it coded for? By N***s on 2024-04-15

A: Yes, the LS-SM551G-80C supports DOM and SFF-8472 digital diagnostics. The product page lists compatibility with Cisco, Arista, Aruba, Juniper, HPE, Dell, Fortinet, NVIDIA/Mellanox and other platforms. For a specific switch model, confirm the required OEM coding before placing a bulk order. By admin on 2024-04-15

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G***s

Brunei Darussalam

Verified Purchase

5 .0

2026-07-07

This is a useful replacement for older 1550nm long-reach Gigabit optics. We tested it with our existing SMF cabling and Duplex LC connections, then monitored the optical readings during the acceptance test. The module behaved consistently throughout the test window.

9 Helpful vote Comments

S***r

Republic of Korea

Verified Purchase

5 .0

2026-05-05

Great long-reach SFP.

21 Helpful vote Comments

S***k

Philippines

Verified Purchase

5 .0

2026-05-03

We ordered these for a multi-brand switch compatibility project. The product page lists support for platforms from Cisco, Arista, Aruba, Juniper, Dell, HPE, Fortinet, and others, which made it a useful candidate for our lab. The actual host coding should still be confirmed before a large deployment.

21 Helpful vote Comments

A***e

Russian Federation

Verified Purchase

5 .0

2026-03-28

This was a good fit for a telecom-style fiber backhaul application. The 1550nm DFB transmitter and 80km SMF reach gave us the distance we needed without moving to a higher-speed platform. The optical link came up cleanly on our test equipment.

79 Helpful vote Comments

S***s

Spain

Verified Purchase

5 .0

2025-09-01

For a long-distance 1G fiber connection, this module offers a practical balance of reach and cost. We used existing SMF with Duplex LC connectors and monitored the optical link through DOM. No issues during our burn-in testing. =D

21 Helpful vote Comments

M***l

Hong Kong

Verified Purchase

5 .0

2025-06-29

Good choice for legacy Gigabit Ethernet links that still need long-distance fiber reach. We used 1550nm SMF optics between two sites and checked TX/RX readings through DOM. The optical budget worked well for our route and the connection remained stable.

3 Helpful vote Comments

R***l

Hungary

Verified Purchase

5 .0

2025-03-13

1550nm and 80km — exactly what we needed.

11 Helpful vote Comments

C***e

Poland

Verified Purchase

5 .0

2025-02-17

We chose this for an enterprise fiber network where some remote cabinets are far beyond normal 1G multimode distances. Using 1550nm single-mode fiber with an 80km-rated SFP gave us plenty of reach. The DOM feature has also been useful for tracking optical performance during maintenance.

62 Helpful vote Comments

S***s

Poland

Verified Purchase

5 .0

2025-02-05

The 1550nm 80km specification was the main reason we selected this module. Our route is well beyond what a typical 10km or 20km 1G optic can cover, so the extra reach is useful. It also fits the standard SFP slot without changing the switch platform.

87 Helpful vote Comments

N***g

Malaysia

Verified Purchase

4 .0

2024-11-11

The transceiver itself worked as expected and passed our optical checks. The only minor issue was that the delivery arrived slightly later than the original estimate. No concerns with the actual 1550nm 80km SFP performance.

57 Helpful vote Comments

R***r

Macao

Verified Purchase

5 .0

2024-10-16

The DOM support is a big plus for our operations team. We can check optical parameters from the host equipment instead of sending someone to the cabinet every time we need basic link diagnostics. The 80km reach also gives plenty of headroom for our current route.

61 Helpful vote Comments

G***z

Finland

Verified Purchase

5 .0

2024-10-09

We deployed several units between network cabinets across a large campus. The 1.25Gbps rate is appropriate for this legacy infrastructure, and the 1550nm wavelength with Duplex LC made it easy to integrate with our existing single-mode fiber plant.

68 Helpful vote Comments

C***z

Indonesia

Verified Purchase

5 .0

2024-10-02

We needed a long-reach 1G SFP for an outdoor network cabinet, with the equipment itself installed in a controlled enclosure. The standard 0 to 70°C operating range fit our application, and the 1550nm Duplex LC interface matched the existing fiber infrastructure.

35 Helpful vote Comments

S***s

Romania

Verified Purchase

4 .0

2024-08-28

The optic works well and the specifications matched our requirements. I only took one star off because the shipment packaging had a small dent, although the transceiver itself arrived protected and passed our installation test.

91 Helpful vote Comments

A***n

Indonesia

Verified Purchase

5 .0

2024-08-06

We needed an 80km SFP for a remote network segment and wanted to keep the deployment within a standard SFP architecture. The 1550nm DFB laser and PIN receiver are appropriate for this type of long-reach optical connection, and the 0 to 70°C standard temperature range works for our indoor cabinet.

31 Helpful vote Comments

B***s

Ukraine

Verified Purchase

5 .0

2024-08-02

For a long-haul Gigabit Ethernet application, this module checked the important boxes: 1.25Gbps data rate, 1550nm DFB laser, PIN receiver, up to 80km over SMF, Duplex LC, and DOM. We validated the link before production and have had a smooth deployment so far.

44 Helpful vote Comments

C***y

France

Verified Purchase

5 .0

2024-07-28

These people are amazing! Ordered my items on Sunday and got a confirmation delivery date of Wednesday and got my items one day earlier than my expectation.Thanks,LINK-PP! You have my love and respect forever!!!

21 Helpful vote Comments

A***n

Turkey

Verified Purchase

5 .0

2024-07-22

The distance is the standout feature here. An 80km 1550nm SFP is exactly what we were looking for for a long fiber route where shorter-reach 1G modules were not enough. Installation was straightforward, and the Duplex LC connector matched our existing fiber panels.

10 Helpful vote Comments

B***s

Republic of Korea

Verified Purchase

5 .0

2024-07-20

We use a mixed-vendor lab with Cisco, Juniper, Aruba, and other platforms, so OEM coding is important for us. This LINK-PP 80km SFP was useful for compatibility testing because the product is offered for multiple major platforms. The link was stable during our tests.

78 Helpful vote Comments

C***e

Taiwan, Province of China

Verified Purchase

5 .0

2024-07-16

LINK-PP always has what I need or what I want at a great price.I was able to get my questions answered by chatting with a customer rep and then quickly make my order. Awesome service. Best experience. Fast shipping is very attractive.

24 Helpful vote Comments

S***a

Norway

Verified Purchase

5 .0

2024-06-29

Delivery three weeks, track number traceable, seller recommend.

110 Helpful vote Comments

J***s

Russian Federation

Verified Purchase

5 .0

2024-06-21

The price for the item I purchased was excellent.

44 Helpful vote Comments

J***r

Japan

Verified Purchase

5 .0

2024-05-20

Very practical for network teams maintaining mixed-generation infrastructure. We used the 1.25Gbps module on a long SMF route and appreciated that it supports real-time digital diagnostic monitoring. It gave our technicians a much easier way to check the optical link during troubleshooting.

70 Helpful vote Comments

L***n

Finland

Verified Purchase

5 .0

2024-05-07

Clean install, stable link, no drama. :D

6 Helpful vote Comments

Y***g

Thailand

Verified Purchase

5 .0

2024-04-10

Outstanding place to shop. I have done business there before and will do as my need requires.

60 Helpful vote Comments

C***h

Turkey

Verified Purchase

5 .0

2024-04-01

Received on-time and completely working product as expected.

98 Helpful vote Comments

J***r

United States

Verified Purchase

5 .0

2024-02-23

Easy ordering, quickly installed. No problems or concerns. Nicely priced compared to other retailers.

58 Helpful vote Comments

B***s

Singapore

Verified Purchase

5 .0

2024-02-08

Nice balance of reach, monitoring, and cost. We needed a 1.25Gbps 1550nm optical transceiver for a long-distance SMF link rather than a higher-speed optic. The module fit our SFP ports, worked with Duplex LC cabling, and gave us the diagnostics we wanted. :-D

99 Helpful vote Comments

D***n

Norway

Verified Purchase

5 .0

2023-12-25

really great services

16 Helpful vote Comments

H***H

Russian Federation

Verified Purchase

5 .0

2023-11-23

I received my order very Fast and in excellent condition. 10/25/40G Transceiver Moduless were exactly as stated and well packaged. I'll test them tomorrow and reedit the review.

13 Helpful vote Comments

J***n

Poland

Verified Purchase

5 .0

2023-09-17

Quick and easy ordering process..best price i found online for this item!

52 Helpful vote Comments

M***n

Libyan Arab Jamahiriya

Verified Purchase

5 .0