Just to confirm, does this duplex LC transceiver require OM2 multi-mode fiber, or can I use it with my existing OM1 or OM3 MMF patch cables?

You can use it with OM1, OM2, OM3, or OM4 MMF! While the maximum 550m transmission distance is officially rated over OM2/OM3, it's fully backwards compatible with older OM1 cables (though the max distance will drop to around 275m).

Hello sir, will this LS-MM851G-S5C plug and play with Cisco Catalyst 9300 series? Also, does it trigger any unsupported transceiver warnings?

Yes, it is 100% MSA compliant and thoroughly tested for OEM compatibility with Cisco switches, including the Catalyst 9300. It functions just like the original GLC-SX-MMD, so you won't see any "unsupported transceiver" error logs in your CLI.

The specs say this is a commercial 0 to 70°C module. Do you have an industrial version of this exact 850nm SFP that can survive in an outdoor telecom cabinet?

Good question! This commercial-grade model handles indoor data centers and AC-cooled racks perfectly. For harsh outdoor environments or cell tower backhaul, we recommend our industrial-grade counterpart (LS-MM851G-S5I), which supports extreme temperatures from -40°C to 85°C.

We require full DOM/DDM for our network monitoring system. Does this module support SFF-8472 protocol for tracking TX/RX power and temperature?

Yes, indeed! The LS-MM851G-S5C features built-in Digital Optical Monitoring (DOM) compliant with the SFF-8472 protocol. It allows your sysadmins to monitor real-time diagnostics like temperature, voltage, laser bias current, and TX/RX optical power directly from your switch interface.

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Allied Telesis AT-SPSX Compatible LINK-PP 1G SFP 850nm 550m Duplex LC DOM MMF Optical Transceiver Module

Name: Allied Telesis AT-SPSX Compatible LINK-PP 1G SFP 850nm 550m Duplex LC DOM MMF Optical Transceiver Module
Brand: LINK-PP
SKU: 212747
Price: 6.012 USD
Availability: InStock
Rating: 5 (25 reviews)

# 212747

Product: Allied Telesis AT-SPSX Compatible LINK-PP 1G SFP 850nm 550m Duplex LC DOM MMF Optical Transceiver Module
SKU: 212747
P/N: LS-MM851G-S5C
Price: $ 6.99
Stock: 353 in Stock
Sold: 1.7K
Product URL: https://www.l-p.com/products/482144.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

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Manufacture: LINK-PP

P/N: LS-MM851G-S5C

Compatible:: Cisco; LINK-PP; Adtran; Alcatel-Lucent; Allen-Bradley; Allied Telesis; Arista; Avago; Avaya; Broadcom; Brocade; Calix; Ciena; D-Link; DELL; Extreme; F5 Networks; FS; Force10; Fortinet; Generic; H3C; HPE; HPE Aruba; HPE H3C; HPE ProCurve; IBM; Intel; Juniper; NVIDIA/Mellanox; Netgear; Palo Alto Networks; Planet; ProCurve; SMC Networks; TRENDnet; Ubiquiti

Compatible P/N:: AT-SPSX | 550m; AT-SPEX | 2km

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Allied Telesis AT-SPSX Compatible LINK-PP 1G SFP Specifications

The Allied Telesis AT-SPSX Compatible LINK-PP module is a high-performance, commercial-grade SFP transceiver delivering data rates up to 1.25 Gbps. Featuring an 850nm VCSEL transmitter and a duplex LC interface, it operates efficiently over multi-mode fiber for distances up to 550 meters. Complete with digital optical monitoring support, it ensures reliable and stable gigabit network connectivity.

Allied Telesis Part Number	AT-SPSX	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	850nm	Max Cable Distance	550m over OM2 MMF
Connector	Duplex LC	Media	MMF
Transmitter Type	VCSEL	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-20 to -1dBm
Receiver Sensitivity	-18dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant

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Q: Just to confirm, does this duplex LC transceiver require OM2 multi-mode fiber, or can I use it with my existing OM1 or OM3 MMF patch cables? By D***n on 2026-05-05

A: You can use it with OM1, OM2, OM3, or OM4 MMF! While the maximum 550m transmission distance is officially rated over OM2/OM3, it's fully backwards compatible with older OM1 cables (though the max distance will drop to around 275m). By admin on 2026-05-05
Q: Hello sir, will this LS-MM851G-S5C plug and play with Cisco Catalyst 9300 series? Also, does it trigger any unsupported transceiver warnings? By B***n on 2026-04-28

A: Hi! Yes, it is 100% MSA compliant and thoroughly tested for OEM compatibility with Cisco switches, including the Catalyst 9300. It functions just like the original GLC-SX-MMD, so you won't see any "unsupported transceiver" error logs in your CLI. By admin on 2026-04-28
Q: The specs say this is a commercial 0 to 70°C module. Do you have an industrial version of this exact 850nm SFP that can survive in an outdoor telecom cabinet? By S***n on 2025-11-16

A: Good question! This commercial-grade model handles indoor data centers and AC-cooled racks perfectly. For harsh outdoor environments or cell tower backhaul, we recommend our industrial-grade counterpart (LS-MM851G-S5I), which supports extreme temperatures from -40°C to 85°C. By admin on 2025-11-16
Q: I need to deploy around 300 of these 1G SFP transceivers for a new campus network build. Is there any B2B bulk pricing or discount code available? By A***n on 2025-10-19

A: Absolutely. For enterprise procurement and data center mass deployments, we offer tiered volume discounts. You can check the bulk rates directly on the product page, or contact our sales team via Live Chat for a custom quote on your 300-piece order! By admin on 2025-10-19
Q: We require full DOM/DDM for our network monitoring system. Does this module support SFF-8472 protocol for tracking TX/RX power and temperature? By K***r on 2025-08-15

A: Yes, indeed! The LS-MM851G-S5C features built-in Digital Optical Monitoring (DOM) compliant with the SFF-8472 protocol. It allows your sysadmins to monitor real-time diagnostics like temperature, voltage, laser bias current, and TX/RX optical power directly from your switch interface. By admin on 2025-08-15

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S***s

Venezuela

Verified Purchase

5 .0

2026-05-18

Works great over OM2 MMF patch cables!

223 Helpful vote Comments

S***s

Panama

Verified Purchase

5 .0

2026-05-07

Nice MMF optical transceiver for short links.

52 Helpful vote Comments

B***s

Italy

Verified Purchase

5 .0

2026-04-08

Replaced old modules with this LS-MM851G-S5C. The duplex LC interface clicked perfectly into place.

248 Helpful vote Comments

J***z

Kenya

Verified Purchase

5 .0

2025-11-22

Awesome OEM compatibility! Linked my Dell core switch to a Ubiquiti edge router seamlessly.

146 Helpful vote Comments

B***n

Macao

Verified Purchase

5 .0

2025-11-22

Solid MSA compliant SFP, plug and play!

150 Helpful vote Comments

E***e

United Kingdom

Verified Purchase

4 .0

2025-11-02

Packaging was excessive for these transceivers, though the 850nm SFP performance is solid.

133 Helpful vote Comments

P***r

India

Verified Purchase

5 .0

2025-07-14

Deployed these gigabit transceivers for a multi-building fiber campus network. The 550m distance spec is conservative; we pushed solid speeds without signal degradation. Essential gear for any serious data center!

235 Helpful vote Comments

N***z

Norway

Verified Purchase

5 .0

2025-06-04

Perfect 1G SFP for indoor switch upgrades!

86 Helpful vote Comments

B***a

Belgium

Verified Purchase

5 .0

2025-05-25

Flawless Cisco compatible 1G SFP module connection.

103 Helpful vote Comments

K***n

France

Verified Purchase

5 .0

2025-05-16

Great price for bulk 1.25G SFP transceivers.

133 Helpful vote Comments

K***n

Ukraine

Verified Purchase

5 .0

2025-05-15

Fast 850nm transceiver, DOM feature is super handy.

237 Helpful vote Comments

M***r

United States

Verified Purchase

5 .0

2025-05-09

Good duplex LC SFP for home NAS.

212 Helpful vote Comments

J***n

Colombia

Verified Purchase

5 .0

2025-03-18

Upgraded our campus networking setup. The 550m transmission distance is perfectly accurate!

163 Helpful vote Comments

J***e

United States

Verified Purchase

5 .0

2024-09-03

Best shipping experience in the inter webs

52 Helpful vote Comments

V***v

Malaysia

Verified Purchase

5 .0

2024-08-09

Thanks, good price and Fast respond. Wait for the next order.

56 Helpful vote Comments

Y***S

Finland

Verified Purchase

5 .0

2024-06-14

On time delivery and Link-pp always has great customer service!

88 Helpful vote Comments

M***o

United States

Verified Purchase

5 .0

2024-05-17

I ordered equipment from LINK-PP.COM regularly and they always deliver. I have not had a bad or missed order and everything is in good condition. Turnaround times are Fast and expectations are always met. That's why I choose it.

41 Helpful vote Comments

J***n

Mexico

Verified Purchase

5 .0

2024-04-13

I had some questions about an order I placed on the weekend and received prompt, professional, and courteous service.

41 Helpful vote Comments

A***L

Netherlands

Verified Purchase

5 .0

2024-02-25

Super Product, will buy again.

47 Helpful vote Comments

A***y

Japan

Verified Purchase

5 .0

2024-02-17

So far great pricing. Haven't received the product yet.

44 Helpful vote Comments

T***d

United States

Verified Purchase

5 .0

2023-12-13

installed a couple days ago on our test bed, seems to work perfectly fine.Will probably buy again

63 Helpful vote Comments

R***n

United States

Verified Purchase

5 .0

2023-11-17

I am very pleased with how easy it is to find everything I need on the site. It is Fast and works well with purchases through my PayPal account. Glad to see l-p.com is utilizing the latest payment methods.

43 Helpful vote Comments

C***s

Australia

Verified Purchase

5 .0

2023-05-30

Work perfectly , Quick and easy to use. Excellent results. More conaistently good results and much easier to use

45 Helpful vote Comments

H***n

Turkey

Verified Purchase

5 .0