Our switch is installed in a factory cabinet, and the internal temperature is usually around 55°C. Can we use this model?

The module can operate up to 70°C case temperature, but we recommend checking the actual module case temperature and ensuring sufficient ventilation in the cabinet.

We need remote monitoring because the fiber link is difficult to access. Does this module provide optical diagnostics?

Yes. It supports real-time DDM monitoring under SFF-8472, allowing compatible equipment to read information such as optical transmit power, receive power, temperature, voltage, and bias current.

We are replacing an old 1G CWDM optical transceiver in a storage network. Does this SFP transceiver support 1G Fibre Channel?

Yes. This LS-CW591G-80C SFP optical transceiver supports 1.063Gbps Fibre Channel, making it suitable for many 1G SAN and storage connectivity applications.

We have a 75km single-mode fiber route with several patch panels in between. Is this 80km CWDM SFP suitable?

It may be suitable, as this module supports transmission distances of up to 80km over single-mode fiber. However, 75km is close to the maximum distance, so the total link loss should be checked carefully. Please include fiber attenuation, connector and patch-panel loss, splice loss, and CWDM MUX/DEMUX insertion loss.

We are expanding our 1G CWDM network and already have a MUX/DEMUX with an available 1590nm port. Can this SFP be used on that channel for a long-distance single-mode fiber link?

Yes. The LS-CW591G-80C is a 1G CWDM SFP operating at 1590nm, so it can be installed in a matching 1590nm channel on a CWDM MUX/DEMUX. It is designed for duplex single-mode fiber links and supports transmission distances of up to 80km.

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LINK-PP LS-CW591G-80C 1G SFP CWDM 1590nm 80km Duplex LC DDM SMF Optical Transceiver Module

Name: LINK-PP LS-CW591G-80C 1G SFP CWDM 1590nm 80km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 203426
Price: 44.72 USD
Availability: InStock
Rating: 4.9 (23 reviews)

# 203426

Product: LINK-PP LS-CW591G-80C 1G SFP CWDM 1590nm 80km Duplex LC DDM SMF Optical Transceiver Module
SKU: 203426
P/N: LS-CW591G-80C
Price: $ 52
Stock: 75 in Stock
Sold: 425
Product URL: https://www.l-p.com/products/492892.htm

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Manufacture: LINK-PP

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Compatible:: Cisco; LINK-PP; Allied Telesis; Arista; Brocade; Ciena; Dell; Extreme; Juniper; Netgear

Wavelength:: 1270nm; 1290nm; 1310nm; 1330nm; 1350nm; 1370nm; 1390nm; 1410nm; 1430nm; 1450nm; 1470nm; 1490nm; 1510nm; 1530nm; 1550nm; 1570nm; 1590nm; 1610nm

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LINK-PP LS-CW591G-80C 1G SFP Specifications

LS-CW591G-80C functions as a 1G CWDM SFP optical transceiver designed with a 1590nm DFB laser transmitter and PIN photodetector. This module facilitates long-reach data links up to 80km utilizing standard single-mode fiber. It also supports real-time digital diagnostic monitoring interfaces for proactive optical link management.

LINK-PP Part Number	LS-CW591G-80C	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1590nm	Max Cable Distance	80km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-1 to +4dBm	RX Power	-26 to -1dBm
Receiver Sensitivity	-26dBm	Receiver Overload	-1dBm
EMC (Electro Magnetic Comnatihilitv)	Supported	DDM	Supported
Operating Temperature Range	0 to 70°C	Protocols	SFP MSA、SFF-8472

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Q: Our switch is installed in a factory cabinet, and the internal temperature is usually around 55°C. Can we use this model? By I***n on 2026-03-26

A: The module can operate up to 70°C case temperature, but we recommend checking the actual module case temperature and ensuring sufficient ventilation in the cabinet. By admin on 2026-03-27
Q: We need remote monitoring because the fiber link is difficult to access. Does this module provide optical diagnostics? By C***r on 2026-02-05

A: Yes. It supports real-time DDM monitoring under SFF-8472, allowing compatible equipment to read information such as optical transmit power, receive power, temperature, voltage, and bias current. By admin on 2026-02-06
Q: We are replacing an old 1G CWDM optical transceiver in a storage network. Does this SFP transceiver support 1G Fibre Channel? By P***m on 2025-12-25

A: Yes. This LS-CW591G-80C SFP optical transceiver supports 1.063Gbps Fibre Channel, making it suitable for many 1G SAN and storage connectivity applications. By admin on 2025-12-26
Q: We have a 75km single-mode fiber route with several patch panels in between. Is this 80km CWDM SFP suitable? By L***r on 2025-07-05

A: It may be suitable, as this module supports transmission distances of up to 80km over single-mode fiber. However, 75km is close to the maximum distance, so the total link loss should be checked carefully. Please include fiber attenuation, connector and patch-panel loss, splice loss, and CWDM MUX/DEMUX insertion loss. By admin on 2025-07-06
Q: We are expanding our 1G CWDM network and already have a MUX/DEMUX with an available 1590nm port. Can this SFP be used on that channel for a long-distance single-mode fiber link? By F***n on 2025-05-21

A: Yes. The LS-CW591G-80C is a 1G CWDM SFP operating at 1590nm, so it can be installed in a matching 1590nm channel on a CWDM MUX/DEMUX. It is designed for duplex single-mode fiber links and supports transmission distances of up to 80km. By admin on 2025-05-22

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K***s

India

Verified Purchase

5 .0

2026-05-11

Perfect solution for expanding our campus fiber backbone without pulling new single-mode lines. The 1590nm optical wavelength slot on our passive CWDM multiplexer resolved without any adjacent channel crosstalk.

98 Helpful vote Comments

B***a

United Kingdom

Verified Purchase

5 .0

2026-04-18

High-quality SFP CWDM module at a fraction of OEM cost, highly recommend!

45 Helpful vote Comments

F***g

Netherlands

Verified Purchase

5 .0

2026-03-21

Replaced an aging OEM optic with this SFP CWDM 1590nm transceiver on our secondary uplink. Plugged in hot without a single link flap on adjacent switch ports. Truly plug-and-play. (•‿•)

89 Helpful vote Comments

I***s

Russian Federation

Verified Purchase

4 .0

2026-03-05

Solid optical transceiver for building cost-effective redundant CWDM links. Dust caps were slightly tight on the duplex LC optical receptacle, but the optical interface connection clicked in securely once seated.

27 Helpful vote Comments

N***y

Italy

Verified Purchase

5 .0

2026-02-16

Bought these 1590nm CWDM 1G SFP modules to expand capacity on an existing CWDM MUX/DEMUX line. The wavelength was on target, optical power showed up correctly in monitoring, and the links have stayed stable during normal business traffic. Good value for enterprise fiber expansion.

100 Helpful vote Comments

A***r

Japan

Verified Purchase

5 .0

2026-02-03

Rock-solid 1G CWDM 80km SFP optics, no dropouts after 30 days of burn-in.

54 Helpful vote Comments

C***n

Canada

Verified Purchase

5 .0

2026-01-27

Clean 1590nm signal, stable optical output, exactly as specified.

57 Helpful vote Comments

S***n

South Africa

Verified Purchase

5 .0

2026-01-09

We deployed the LS-CW591G-80C as part of an 18-channel CWDM transport upgrade between a main data room and several regional facilities. This specific 1590nm 1G CWDM SFP occupied the final channel in our wavelength plan and ran over approximately 73 km of OS2 single-mode fiber, including multiple patch panels and a CWDM MUX/DEMUX pair. Before turnover, we checked DOM data against our optical test results. TX power sat within the stated -1 to +4 dBm range, while received levels remained comfortably above the -26 dBm sensitivity threshold. After a 30-day burn-in, there were no link flaps, packet drops, or increasing error counters. For a commercial 80 km SFP transceiver, it has been a dependable option.

125 Helpful vote Comments

O***s

Singapore

Verified Purchase

4 .0

2025-12-18

Good 1G 1590nm CWDM optic and the DDM readings were available as expected. Delivery took a little longer than our project schedule preferred, so order early if the deployment date is fixed. The modules arrived safely and worked correctly once installed.

35 Helpful vote Comments

D***t

Brazil

Verified Purchase

5 .0

2025-12-04

We integrated this 1G 80km CWDM module into our municipal fiber passive mux rack. DOM diagnostics display clean TX/RX dBm values without any weird offset errors. Smooth integration into our SNMP monitoring system.

82 Helpful vote Comments

G***r

United States

Verified Purchase

5 .0

2025-11-18

Linked up right away at 1590nm on our long-range metro link, solid optical budget!

46 Helpful vote Comments

J***s

Thailand

Verified Purchase

5 .0

2025-10-23

We picked up a batch of these 80km CWDM SFP modules for an enterprise campus ring interconnect spanning multiple municipal facilities. Physical layer validation on our OTDR and optical spectrum analyzer confirmed a very narrow spectral line width and a clean transmitter eye diagram. Duplex LC optical connectors mate firmly with standard single-mode patch cords without excessive mechanical play. In production, the hot-swap electrical isolation circuit works flawlessly — zero voltage fluctuations observed on adjacent switch line-card ports during live insertion. For enterprise-grade 1G CWDM deployment, this optic delivers exceptional optical power budget stability.

146 Helpful vote Comments

L***n

Republic of Korea

Verified Purchase

5 .0

2025-10-08

Stable Gigabit Ethernet physical layer transmission across our cross-river dark fiber line. Latency and bit error rates are completely clean. Definitely our go-to supplier for 80km long-haul CWDM SFP transceivers.

73 Helpful vote Comments

G***k

Spain

Verified Purchase

5 .0

2025-09-02

Seamless MSA standard compliance. The EEPROM table loaded correctly without throwing unsupported transceiver warnings or disabling the slot interface. Very satisfied.

88 Helpful vote Comments

K***w

Malaysia

Verified Purchase

5 .0

2025-08-31

Our team tested these modules for a long-distance 1GbE aggregation ring serving small branch offices. We ran a controlled test using the LS-CW591G-80C at both ends, Duplex LC connectors, and a 1590nm CWDM passband through our existing optical filtering equipment. The modules established clean links without needing special handling beyond normal fiber cleaning and polarity checks. The biggest advantage for us was SFF-8472 digital diagnostics. We can pull live temperature, voltage, transmit power, and receive power through the switch interface, then compare those readings with baseline commissioning values. That helps us catch dirty connectors or gradual fiber loss before users report a problem. Great fit for managed enterprise fiber networks.

152 Helpful vote Comments

I***d

France

Verified Purchase

5 .0

2025-08-09

Flawless plug-and-play installation over standard single-mode fiber.

69 Helpful vote Comments

H***y

Norway

Verified Purchase

5 .0

2025-07-25

This 1.25Gbps 80km CWDM optical transceiver worked well for a remote access-site uplink over single-mode fiber. The DFB transmitter and PIN receiver have been stable, with no CRC errors seen in our routine checks.

112 Helpful vote Comments

E***d

Mexico

Verified Purchase

5 .0

2025-06-30

Deployed 10 units of these CWDM modules across our distribution layer switches. Excellent thermal dissipation inside standard commercial indoor racks, keeping transceiver case temperatures well below the 70°C ceiling. Solid build.

111 Helpful vote Comments

T***r

Indonesia

Verified Purchase

5 .0

2025-06-12

We used this 1590nm CWDM 80km SFP module for backhaul connectivity between an indoor network room and a remote aggregation location. The route includes legacy single-mode cable, several splices, and two cross-connect points, so our priority was optical margin rather than just reaching the distance target. The module maintained a stable receive level throughout testing, and the DDM information aligned with our handheld optical power meter closely enough for operational monitoring. It is a practical long-haul CWDM SFP for indoor telecom and enterprise deployments.

133 Helpful vote Comments

M***s

Sweden

Verified Purchase

5 .0

2025-05-19

Great price-to-performance ratio for long-distance 1G CWDM SFP optics. Optical receiver sensitivity is high enough to handle real-world patch panel splice losses across our 75km link. Highly dependable.

104 Helpful vote Comments

H***n

Germany

Verified Purchase

5 .0

2025-04-22

DDM telemetry works like a charm, optical power levels are spot on.

62 Helpful vote Comments

R***n

Philippines

Verified Purchase

5 .0

2025-02-28

Adding dedicated fiber strands between our two metro colocation facilities was cost-prohibitive, so we deployed these 1590nm CWDM 1G SFP modules to light up unused channels on our existing CWDM filter grid. The optical transceivers complied strictly with ITU-T G.694.2 wavelength grid tolerances, completely avoiding inter-channel bleeding into neighboring 1570nm and 1610nm optics. Both modules operate reliably within our 0°C to +70°C commercial temperature server rooms. EEPROM checksums and MSA coding are fully intact. A dependable, carrier-grade transceiver that saved us thousands in capital infrastructure expenditure.

138 Helpful vote Comments

J***n

Australia

Verified Purchase

5 .0

2025-01-15

Ordered a pair of these 1590nm CWDM SFP modules for a remote branch campus link spanning roughly 68km. Both transceivers locked onto the duplex LC fiber instantly, and the optical link attenuation came well within safe operating margins. Great budget saver.

93 Helpful vote Comments