This module operates at 0 to 70°C, but we need optics for outdoor cabinets in harsh winters. Do you have an industrial wide-temperature version of this 40km BiDi SFP?

Yes, we do! For extreme environments, we manufacture an industrial-grade version (model LS-BL55311G-40I) which operates flawlessly in temperatures ranging from -40°C to 85°C. It is perfectly suited for cell tower backhaul and unconditioned outdoor enclosures.

We run a mixed environment with Cisco Catalyst and Juniper EX series switches. Will this LS-BL55311G-40C module require any special CLI commands to bypass vendor lock-in?

No special CLI commands are needed. This 1G BiDi SFP is strictly MSA compliant and rigorously tested for seamless interoperability across major network equipment brands, including Cisco and Juniper, providing a true plug-and-play experience.

I want to upgrade our legacy network. Can I use OM3 multimode fiber with this specific 1G optic, or is it strictly for single-mode fiber?

This LS-BL55311G-40C module is designed specifically for Single Mode Fiber (SMF) to reliably achieve the 40km transmission distance. Using multimode fiber like OM3 is not recommended, as it will cause severe modal dispersion and drastically reduce your link distance.

I'm planning a data center mass deployment and need about 1K units. Do you offer any tiered discounts for bulk purchasing on these 40km SMF optics?

Absolutely! We offer highly competitive tiered pricing for bulk B2B procurement. For an order of 1K units, our per-unit cost drops significantly compared to the standard retail price. Please contact our sales team directly to lock in your discount.

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D-Link DEM-331T Compatible LINK-PP 1G SFP BiDi 1550nm-TX/1310nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module

Name: D-Link DEM-331T Compatible LINK-PP 1G SFP BiDi 1550nm-TX/1310nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 217222
Price: 7.31 USD
Availability: InStock
Rating: 5 (22 reviews)

# 217222

Product: D-Link DEM-331T Compatible LINK-PP 1G SFP BiDi 1550nm-TX/1310nm-RX 40km Simplex LC DOM SMF Optical Transceiver Module
SKU: 217222
P/N: LS-BL55311G-40C
Price: $ 8.5
Stock: 1474 in Stock
Sold: 1.6K
Product URL: https://www.l-p.com/products/477507.htm

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

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

22 Reviews

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Manufacture: LINK-PP

P/N: LS-BL55311G-40C

Compatible:: Cisco; LINK-PP; Brocade; D-Link; FS; Generic; H3C; Juniper; Netgear; TRENDnet

Compatible P/N:: DEM-330R | 10km; DEM-330T | 10km; DEM-331R | 40km; DEM-331T | 40km

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D-Link DEM-331T Compatible LINK-PP 1G BiDi SFP Specifications

The D-Link DEM-331T Compatible LINK-PP module is a high-performance 1G BiDi SFP optical transceiver designed for robust Gigabit Ethernet links. Operating on a simplex LC fiber interface, this single-mode module utilizes 1550nm-TX and 1310nm-RX wavelengths to achieve reliable data transmission up to 40km. It strictly complies with SFP MSA standard specifications.

D-Link Part Number	DEM-331T	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1550nm-TX/1310nm-RX	Max Cable Distance	40km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-5 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	<-24dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	Fast Ethernet, Gigabit Fibre Channel, MSA Compliant

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Q: This module operates at 0 to 70°C, but we need optics for outdoor cabinets in harsh winters. Do you have an industrial wide-temperature version of this 40km BiDi SFP? By L***n on 2026-02-23

A: Yes, we do! For extreme environments, we manufacture an industrial-grade version (model LS-BL55311G-40I) which operates flawlessly in temperatures ranging from -40°C to 85°C. It is perfectly suited for cell tower backhaul and unconditioned outdoor enclosures. By admin on 2026-02-23
Q: We run a mixed environment with Cisco Catalyst and Juniper EX series switches. Will this LS-BL55311G-40C module require any special CLI commands to bypass vendor lock-in? By D***n on 2025-10-09

A: No special CLI commands are needed. This 1G BiDi SFP is strictly MSA compliant and rigorously tested for seamless interoperability across major network equipment brands, including Cisco and Juniper, providing a true plug-and-play experience. By admin on 2025-10-09
Q: I want to upgrade our legacy network. Can I use OM3 multimode fiber with this specific 1G optic, or is it strictly for single-mode fiber? By R***s on 2025-08-04

A: This LS-BL55311G-40C module is designed specifically for Single Mode Fiber (SMF) to reliably achieve the 40km transmission distance. Using multimode fiber like OM3 is not recommended, as it will cause severe modal dispersion and drastically reduce your link distance. By admin on 2025-08-04
Q: I'm planning a data center mass deployment and need about 1K units. Do you offer any tiered discounts for bulk purchasing on these 40km SMF optics? By S***z on 2025-02-05

A: Absolutely! We offer highly competitive tiered pricing for bulk B2B procurement. For an order of 1K units, our per-unit cost drops significantly compared to the standard retail price. Please contact our sales team directly to lock in your discount. By admin on 2025-02-06

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S***s

Venezuela

Verified Purchase

5 .0

2026-05-29

Great budget SMF module for NAS.

84 Helpful vote Comments

K***n

Ukraine

Verified Purchase

5 .0

2026-05-10

Fantastic Link-PP optic! It paired with our Brocade network adapters without any CLI errors.

161 Helpful vote Comments

W***a

Germany

Verified Purchase

5 .0

2026-03-18

Perfect 40km transmission distance on SMF. Excellent optical transceiver for our enterprise access.

122 Helpful vote Comments

M***e

Switzerland

Verified Purchase

4 .0

2026-03-01

Arrived a day late but the 1G BiDi module works flawlessly on Cisco.

48 Helpful vote Comments

D***l

United Kingdom

Verified Purchase

5 .0

2026-02-22

Plug and play gigabit fiber module! ⚡

124 Helpful vote Comments

W***n

Republic of Korea

Verified Purchase

5 .0

2026-01-23

Great 1G SFP BiDi transceiver for long-reach fiber! Connects our warehouses beautifully.

97 Helpful vote Comments

J***e

Japan

Verified Purchase

5 .0

2025-12-02

Perfect for our server room upgrade.

61 Helpful vote Comments

M***g

Denmark

Verified Purchase

5 .0

2025-08-28

The simplex LC connector snaps in securely. DOM support is accurate and very helpful.

203 Helpful vote Comments

P***n

Colombia

Verified Purchase

5 .0

2025-08-11

Deployed a batch for our campus fiber networking. DDM readings are incredibly stable over 35km SMF links. Seamless compatibility with our mixed Juniper and H3C switches. Highly recommend these 1.25G optics!

37 Helpful vote Comments

A***n

Netherlands

Verified Purchase

5 .0

2025-08-07

Flawless OEM compatibility! Plugged this 1550nm/1310nm module into our D-Link switch instantly.

41 Helpful vote Comments

J***n

Spain

Verified Purchase

5 .0