Does this transceiver require single-mode or multi-mode fiber, and what connector does it use?

This specific module requires Single-Mode Fiber (SMF) to achieve its optimal transmission distance of up to 20km at a 1310nm wavelength. It features an industry-standard Duplex LC connector interface.

Is this unit fully compliant with standard gigabit ethernet protocols for our legacy setup?

Yes, it fully supports IEEE 802.3z and IEEE 802.3ah-2004 standards, alongside SFF-8472 for digital optical monitoring (DOM), ensuring perfect protocol adaptation with both legacy and modern gigabit Ethernet infrastructures.

Will these work with my Cisco catalyst switches without throwing any unsupported transceiver errors?

Yes! The LS-SM311G-20I is highly OEM compatible. It complies strictly with MSA standards and works seamlessly with Cisco, Juniper, and other multi-brand switches without triggering any error codes.

Can this module survive in an unventilated outdoor cabinet? Summers here get brutally hot.

Yes, it is a rugged industrial-grade transceiver. It supports extreme operating temperatures ranging from -40°C to 85°C (-40°F to 185°F), making it perfect for harsh outdoor environments, smart city nodes, and base station deployments.

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Cisco GLC-LX-SM-RGD Compatible LINK-PP 1.25G SFP 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

Name: Cisco GLC-LX-SM-RGD Compatible LINK-PP 1.25G SFP 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 213599
Price: 4.902 USD
Availability: InStock
Rating: 4.9 (13 reviews)

# 213599

Product: Cisco GLC-LX-SM-RGD Compatible LINK-PP 1.25G SFP 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU: 213599
P/N: LS-SM311G-20I
Price: $ 5.7
Stock: 838 in Stock
Sold: 1.1K
Product URL: https://www.l-p.com/products/476758.htm

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Manufacture: LINK-PP

P/N: LS-SM311G-20I

Compatible:: Cisco; LINK-PP

Compatible P/N:: SFP1G-SX-31 | 2km; SFP1G-SX-31-I | 2km; GLC-LH-SM | 10km; GLC-LH-SMD | 10km; GLC-LH-SM-20 | 20km; GLC-LX-SM-RGD | 20km; GLC-EX-SM1550-40 | 40km; GLC-EX-SMD | 40km; MGBLH1 | 40km; GLC-ZX-SM | 80km; GLC-ZX-SM-RGD | 80km; GLC-EZX-SM-100 | 100km; GLC-EZX-SM-120 | 120km; GLC-EZX-SM-160 | 160km

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Cisco GLC-LX-SM-RGD Compatible LINK-PP 1.25G SFP Specifications

The Cisco GLC-LX-SM-RGD Compatible LINK-PP module is a high-performance, industrial-grade 1.25G SFP optical transceiver designed for dependable gigabit networks. It operates at a 1310nm wavelength over single-mode fiber, achieving transmissions up to 20km via a duplex LC connector. Supporting DOM, this module delivers robust connectivity across extreme temperatures ranging from -40°C to 85°C.

Cisco Part Number	GLC-LX-SM-RGD	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	-23dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004, IEEE 802.3z

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Q: Does this transceiver require single-mode or multi-mode fiber, and what connector does it use? By D***r on 2026-02-19

A: This specific module requires Single-Mode Fiber (SMF) to achieve its optimal transmission distance of up to 20km at a 1310nm wavelength. It features an industry-standard Duplex LC connector interface. By admin on 2026-02-19
Q: Is this unit fully compliant with standard gigabit ethernet protocols for our legacy setup? By P***s on 2026-02-12

A: Yes, it fully supports IEEE 802.3z and IEEE 802.3ah-2004 standards, alongside SFF-8472 for digital optical monitoring (DOM), ensuring perfect protocol adaptation with both legacy and modern gigabit Ethernet infrastructures. By admin on 2026-02-12
Q: Will these work with my Cisco catalyst switches without throwing any unsupported transceiver errors? By L***s on 2025-10-29

A: Yes! The LS-SM311G-20I is highly OEM compatible. It complies strictly with MSA standards and works seamlessly with Cisco, Juniper, and other multi-brand switches without triggering any error codes. By admin on 2025-10-29
Q: Can this module survive in an unventilated outdoor cabinet? Summers here get brutally hot. By W***z on 2025-10-09

A: Yes, it is a rugged industrial-grade transceiver. It supports extreme operating temperatures ranging from -40°C to 85°C (-40°F to 185°F), making it perfect for harsh outdoor environments, smart city nodes, and base station deployments. By admin on 2025-10-09

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M***e

Egypt

Verified Purchase

5 .0

2026-05-21

Solid 1.25G transceiver for single-mode fiber links.

75 Helpful vote Comments

P***s

Viet Nam

Verified Purchase

5 .0

2026-05-12

Deploying these industrial 1.25G SFP modules across outdoor base stations was a breeze. They easily handle extreme temps. DOM reporting is precise, making remote fiber maintenance much simpler for us.

40 Helpful vote Comments

R***e

Poland

Verified Purchase

5 .0

2026-04-20

Flawless 1310nm SFP for our campus network!

52 Helpful vote Comments

B***n

Ireland

Verified Purchase

5 .0

2026-02-14

No issues with IEEE 802.3z protocol adaptation.

23 Helpful vote Comments

S***n

Taiwan, Province of China

Verified Purchase

5 .0

2026-02-12

Perfect for our base station backhaul deployment.

167 Helpful vote Comments

P***h

Argentina

Verified Purchase

5 .0

2025-11-20

Bought a batch for server room deployment. The Duplex LC interfaces are well built.

83 Helpful vote Comments

A***e

Republic of Korea

Verified Purchase

5 .0

2025-09-21

Bulk ordered these for an enterprise LAN backbone upgrade. The Duplex LC connectors mate securely, and SFF-8472 compliance ensures seamless integration. Fantastic gigabit SFP performance at a fraction of brand costs.

74 Helpful vote Comments

W***l

France

Verified Purchase

5 .0

2025-08-16

Using these for our campus fiber network. The 20km transmission on single-mode fiber is perfectly stable. Real-time DOM monitoring is a lifesaver for our server room operations.

134 Helpful vote Comments

E***g

Germany

Verified Purchase

5 .0

2025-05-09

DOM feature works great on Cisco switches.

151 Helpful vote Comments

M***z

New Zealand

Verified Purchase

5 .0