We have hot-swappable 1G slots on our rack servers. Can we hot-plug these in live environments without downing the rack?

Absolutely, the SFP footprint is fully hot-pluggable. You can swap them live without interrupting the rest of the chassis.

Does this module support digital diagnostics on the switch so our IT team can check optical power levels remotely?

Yes! The LS-MM851G-02C module supports SFF-8472 digital diagnostics functions. Your switch management interface will display real-time optical output/input power, supply voltage, operating temperature, and laser bias current.

Our legacy building is wired with older 50/125µm multi-mode fiber. Can these reach our distribution switch 1.5km away?

Yes, the 850nm VCSEL laser is optimized to push a 1G signal up to 2km on standard 50/125µm MMF. You will have plenty of distance headroom.

We are hooking up NAS arrays with standard OM3 patch cables. Does this take a single LC or dual LC connector?

It uses a standard duplex LC receptacle for transmit and receive. Just plug in a standard duplex LC patch cord and you are good to go.

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LINK-PP LS-MM851G-02C 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module

Name: LINK-PP LS-MM851G-02C 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module
Brand: LINK-PP
SKU: 209162
Price: 8.6 USD
Availability: InStock
Rating: 4.9 (25 reviews)

# 209162

Product: LINK-PP LS-MM851G-02C 1G SFP 850nm 2km Duplex LC DOM MMF Optical Transceiver Module
SKU: 209162
P/N: LS-MM851G-02C
Price: $ 10
Stock: 262 in Stock
Sold: 1.8K
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Compatible P/N:: LS-MM851G-S5C | 550m; LS-MM851G-S5I | 550m; LS-MM311G-02AC | 2km; LS-MM311G-02AI | 2km; LS-MM311G-02C | 2km; LS-MM311G-02I | 2km; LS-MM851G-02C | 2km; LS-MM851G-02I | 2km

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LINK-PP LS-MM851G-02C 1G SFP Specifications

LS-MM851G-02C operates as a 1G multi-mode SFP optical module that handles reliable 2km data transmissions over 50/125µm MMF at an 850nm wavelength, featuring real-time digital diagnostic monitoring across a standard 0 to +70°C temperature range.

LINK-PP Part Number	LS-MM851G-02C	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	850nm	Max Cable Distance	2km
Connector	Duplex LC	Media	MMF
Transmitter Type	VSCEL	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: We have hot-swappable 1G slots on our rack servers. Can we hot-plug these in live environments without downing the rack? By F***n on 2026-04-02

A: Absolutely, the SFP footprint is fully hot-pluggable. You can swap them live without interrupting the rest of the chassis. By admin on 2026-04-03
Q: Does this module support digital diagnostics on the switch so our IT team can check optical power levels remotely? By I***r on 2026-03-29

A: Yes! The LS-MM851G-02C module supports SFF-8472 digital diagnostics functions. Your switch management interface will display real-time optical output/input power, supply voltage, operating temperature, and laser bias current. By admin on 2026-03-30
Q: Our legacy building is wired with older 50/125µm multi-mode fiber. Can these reach our distribution switch 1.5km away? By G***r on 2025-11-18

A: Yes, the 850nm VCSEL laser is optimized to push a 1G signal up to 2km on standard 50/125µm MMF. You will have plenty of distance headroom. By admin on 2025-11-19
Q: We are hooking up NAS arrays with standard OM3 patch cables. Does this take a single LC or dual LC connector? By H***r on 2025-07-27

A: It uses a standard duplex LC receptacle for transmit and receive. Just plug in a standard duplex LC patch cord and you are good to go. By admin on 2025-07-28

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N***z

Brunei Darussalam

Verified Purchase

5 .0

2026-05-18

Replaced legacy optical modules that were prone to intermittent thermal drift with these LINK-PP units. Clean signal reception and stable wavelength tolerance solved our recurring port flapping issue completely.

92 Helpful vote Comments

H***r

Ireland

Verified Purchase

5 .0

2026-04-29

Works in hot indoor racks, the commercial temperature range is fine.

61 Helpful vote Comments

Q***t

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2026-03-14

Purchased for a small data center expansion. These commercial-grade SFPs slot into our gigabit switches without compatibility headaches. The duplex LC interface matched our existing OM2/OM3 multi-mode fiber runs. TX bias and RX power readings via DDM are stable. No complaints so far.

104 Helpful vote Comments

B***s

Belgium

Verified Purchase

5 .0

2026-03-04

Used these 850nm SFP modules to interconnect two office blocks over multi-mode fiber cabling without any packet loss.

70 Helpful vote Comments

E***e

Romania

Verified Purchase

5 .0

2026-02-24

Great multi-mode 1G SFP module, 2km reach is perfect for our building links.

60 Helpful vote Comments

T***z

Maldives

Verified Purchase

5 .0

2026-02-10

Our telecom lab performs extensive compatibility testing on third-party SFP modules before approving them for client deployments. The LS-MM851G-02C passed all our tests: 1.25Gbps line rate, 850nm center wavelength, and full DDM/DOM functionality. We verified TX power and RX sensitivity across multiple switch platforms. The duplex LC connector mates cleanly with our MMF patch panels, and the module’s power consumption is in line with industry norms. We’ve used these in base station backhaul projects where multi-mode fiber is already in place, and they’ve been rock solid.

122 Helpful vote Comments

K***l

Bulgaria

Verified Purchase

5 .0

2026-01-18

Upgraded our server room connectivity with 30 of these duplex LC modules over OM4 patch cords. Link attenuation is virtually nonexistent and latency remains rock solid during peak traffic hours. A cost-effective solution for short-to-medium range fiber backbones.

101 Helpful vote Comments

F***n

Ukraine

Verified Purchase

5 .0

2025-12-30

DOM monitoring is a lifesaver for quick TX/RX checks.

77 Helpful vote Comments

U***t

Nepal

Verified Purchase

5 .0

2025-12-12

We manage fiber infrastructure for a smart city project, including traffic cameras and public Wi-Fi hotspots. These 1G SFP modules are deployed in aggregation switches that connect remote nodes to our core. The 2km reach gives us headroom even on longer multi-mode runs, and the 850nm wavelength is compatible with our existing OM3 fiber. We’ve stress-tested these in hot summer conditions (up to 55°C in cabinets) and they’ve held steady. For the price, these are a no-brainer for commercial-grade multimode deployments.

136 Helpful vote Comments

A***t

Austria

Verified Purchase

5 .0

2025-11-28

Real-time DOM metrics are spot on and optical power levels remain completely stable.

94 Helpful vote Comments

P***n

Lithuania

Verified Purchase

5 .0

2025-11-05

We deployed these LS-MM851G-02C transceiver modules across our office fiber backbone. The 850nm wavelength and 2km distance spec handle our inter-building links without any signal loss. DOM data is accurate and helps our NOC team monitor optical power levels remotely. Very satisfied with this batch.

82 Helpful vote Comments

J***r

Hungary

Verified Purchase

5 .0

2025-10-15

Used these 850nm 2km SFP modules for local base station backhaul links in indoor telecom cabinets. Transceiver detection was immediate, and digital optical monitoring reports accurate RX/TX power levels in real time. Great engineering quality for standard commercial environments.

95 Helpful vote Comments

Z***d

United Arab Emirates

Verified Purchase

4 .0

2025-10-01

The optical transceivers themselves are spot-on — plugged all 10 modules into our commercial switch stack and verified full gigabit line rate with active DOM tracking. However, international customs holding at the import hub delayed local delivery by 3 business days. If you are ordering for tight deployment schedules, allocate a few extra days for customs transit. Product quality itself is excellent!

32 Helpful vote Comments

R***e

Morocco

Verified Purchase

5 .0

2025-09-26

Great value for a DOM-enabled 1G SFP. We needed multi-mode modules for our campus fiber ring and these fit the bill. The 2km spec gives us plenty of margin even on longer MMF runs. No interoperability issues with our core switches.

127 Helpful vote Comments

C***s

Finland

Verified Purchase

5 .0

2025-09-17

Linked our storage array to the core switch seamlessly over 850nm multi-mode fiber.

52 Helpful vote Comments

L***s

Denmark

Verified Purchase

5 .0

2025-08-21

Thermal management was our main concern for densely populated switch chassis. These commercial-grade transceivers draw minimal power and operate consistently between 30°C and 38°C under heavy line-rate throughput. Highly recommended for neat and cool rack management.

108 Helpful vote Comments

W***n

Iran, Islamic Republic of

Verified Purchase

4 .0

2025-08-11

Solid 850nm SFP for multi-mode fiber, and the 2km reach is as advertised. Docking one star because shipping took longer than expected, and the tracking info was sparse. Product itself is fine, just wish the logistics were smoother.

20 Helpful vote Comments

G***e

Turkey

Verified Purchase

5 .0

2025-07-11

Dual LC connector fits our existing multi-mode fiber patch panels perfectly.

43 Helpful vote Comments

S***n

Macao

Verified Purchase

5 .0

2025-07-02

We run a large campus network with multiple buildings connected via multi-mode fiber. After testing several vendors, we standardized on these LINK-PP 1G SFP modules. The 850nm wavelength and 2km distance spec align perfectly with our OM2/OM3 runs, which are all under 1.5km. DOM support is critical for our NOC—we pull TX bias, RX power, and temperature data via SNMP and feed it into our monitoring dashboard. Over 3 months and 200+ units deployed, we’ve had zero field failures. The commercial temperature range (0–70°C) is adequate for our indoor racks and climate-controlled outdoor cabinets.

133 Helpful vote Comments

M***b

Belarus

Verified Purchase

5 .0

2025-06-04

Deployed these 1G SFP modules to aggregate security camera feeds across a large logistics facility over 1.5km of MMF lines. Video streams remain smooth without dropouts or frame drops. DDM light-level tracking makes preventive maintenance super straightforward.

85 Helpful vote Comments

V***s

Bangladesh

Verified Purchase

5 .0

2025-05-27

Our data center uses a mix of single-mode and multi-mode fiber for different segments. For the multi-mode sections (mainly intra-rack and adjacent-rack links), we rely on these LS-MM851G-02C 850nm SFP modules. DDM support lets us track transceiver health and catch fiber degradation early. We’ve run these in high-density switch chassis with no thermal issues—the commercial temp range is fine for our climate-controlled environment. Build quality is solid, and the duplex LC latches feel durable after repeated insertions.

118 Helpful vote Comments

D***l

Poland

Verified Purchase

5 .0

2025-05-03

Running smoothly at 34°C inside our main equipment room cabinet.

49 Helpful vote Comments

O***t

Cambodia

Verified Purchase

5 .0

2025-04-16

Installed 12 units of LS-MM851G-02C 1G SFP in indoor wall-mount distribution boxes. Link handshakes occurred instantly and DOM interface reported proper operating voltage and laser bias current. Perfect fit for standard commercial indoor networks.

74 Helpful vote Comments

Z***n

New Zealand

Verified Purchase

5 .0

2025-04-07

Plugged 20 of these multi-mode SFP modules into our distribution switches and all links came up instantly at 1G line rate.

63 Helpful vote Comments

I***n

Israel

Verified Purchase

5 .0

2025-03-08

We needed to connect three separate office blocks over existing multi-mode fiber runs averaging 1.2km. These LS-MM851G-02C SFP modules locked in 1Gbps link speed immediately. Optical power telemetry shows clean reception margins across every pair. Will definitely order another batch for our next site expansion!

88 Helpful vote Comments