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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Calix SFP1G-ZX-55 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module

Name: Calix SFP1G-ZX-55 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 223264
Price: 15.738 USD
Availability: InStock
Rating: 4.9 (30 reviews)

# 223264

Product: Calix SFP1G-ZX-55 Compatible LINK-PP 1G SFP 1550nm 80km DOM Duplex LC SMF Optical Transceiver Module
SKU: 223264
P/N: LS-SM551G-80C
Price: $ 18.3
Stock: 2902 in Stock
Sold: 2.5K
Product URL: https://www.l-p.com/products/493558.htm

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Manufacture: LINK-PP

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:: SFP1G-SX-31 | 2km; SFP1G-SX-31-I | 2km; 100-01662 | 10km; SFP1G-ELX-31 | 20km; 100-01663 | 40km; SFP1G-EX-55 | 40km; SFP1G-ZX-55 | 80km; SFP1G-ZX-55-I | 80km; SFP1G-ZX100-55 | 100km; SFP1G-ZX120-55 | 120km

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Calix SFP1G-ZX-55 Compatible LINK-PP 1G SFP Specifications

The Calix SFP1G-ZX-55 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.

Calix Part Number	SFP1G-ZX-55	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

J***e

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2026-06-27

We installed these in a batch during a network maintenance window. Having the same 1.25Gbps long-distance SFP across several links simplified our spares inventory. The modules are hot-pluggable and the Duplex LC connection made replacement quick.

2 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

M***n

Singapore

Verified Purchase

5 .0

2025-10-01

Good option for extending 1G connectivity over long single-mode fiber. We tested the module before deployment and verified the link at the expected data rate. The DFB laser, PIN receiver, and DOM support are a nice combination for network maintenance.

88 Helpful vote Comments

D***e

Ukraine

Verified Purchase

5 .0

2025-08-13

We were replacing older long-distance 1G optics and wanted something with a standard SFP footprint. These modules matched the requirement well: 1.25Gbps, 1550nm, Duplex LC, SMF, and up to 80km. Testing was straightforward. ;)

4 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

C***t

Macao

Verified Purchase

5 .0

2025-02-14

Solid 80km optic.

82 Helpful vote Comments

A***t

Romania

Verified Purchase

5 .0

2025-01-28

Good value for the distance.

95 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

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

L***n

Finland

Verified Purchase

5 .0

2024-05-07

Clean install, stable link, no drama. :D

6 Helpful vote Comments

M***g

Thailand

Verified Purchase

5 .0

2024-04-23

Works perfectly :)

27 Helpful vote Comments

J***k

Nepal

Verified Purchase

5 .0

2024-03-22

We selected this for a long-distance fiber backhaul where upgrading the entire network to 10G was not justified. The 1.25Gbps SFP gave us the required bandwidth while keeping the existing SFP-based equipment. DOM monitoring is also helpful for ongoing maintenance. :-)

88 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

S***k

Hungary

Verified Purchase

5 .0

2024-01-08

We used several units for a regional fiber deployment and tested them across different compatible switch platforms before production. The SFP MSA and SFF-8472 support made the integration process familiar, while DOM helped us verify the optical conditions during commissioning. Overall, a good fit for our 1G network.

41 Helpful vote Comments

D***n

Norway

Verified Purchase

5 .0

2023-12-25

really great services

16 Helpful vote Comments

A***a

France

Verified Purchase

5 .0