Do I need to use the exact same 1490nm wavelength transceiver on both ends of the fiber link?

Yes. For standard point-to-point single-mode connections, both ends must use matching 1490nm transceivers. If you are using a CWDM Mux/Demux system, make sure both sides connect to the dedicated 1490nm multiplexer channel ports.

What kind of fiber patch cord do I need to connect this 1490nm CWDM SFP module?

You will need a standard single-mode fiber patch cable with duplex LC connectors. This module is designed specifically for single-mode fiber and will not work over multimode fiber.

Can I plug this 1G SFP module directly into my existing passive CWDM Mux/Demux panel?

Yes. As long as your CWDM multiplexer has a dedicated 1490nm channel port and standard duplex LC connections, this module connects directly to expand your fiber capacity without interfering with other wavelength channels.

How do I check if the optical signal is healthy after plugging the module into my switch?

This LS-CW491G-20C module includes built-in DDM (Digital Diagnostic Monitoring). You can easily check the live transmit power, receive light level, operating temperature, and voltage directly through your switch web interface or command line.

Can this 1490nm SFP module run alongside other CWDM wavelengths (like 1470nm, 1510nm, or 1530nm) on the same dark fiber?

Yes. This transceiver is designed with a narrow-band DFB laser specific to the 1490nm ITU grid. It can easily share the same single-mode fiber with other CWDM channels when connected through a standard passive CWDM Mux/Demux.

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Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP CWDM 1490nm 20km Duplex LC DDM SMF Optical Transceiver Module

Name: Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP CWDM 1490nm 20km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 225790
Price: 54.61 SGD
Availability: InStock
Rating: 4.9 (18 reviews)

Product: Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP CWDM 1490nm 20km Duplex LC DDM SMF Optical Transceiver Module
SKU: 225790
P/N: LS-CW491G-20C
Price: SGD 63.5
Stock: 181 in Stock
Sold: 1.7K
Product URL: https://www.l-p.com/products/491806.htm

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

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

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18 Reviews

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Manufacture: LINK-PP P/N: LS-CW491G-20C SKU: 225790

Compatible:: Cisco; LINK-PP; Arista; Brocade; Dell; Extreme; H3C; HPE; HW; Juniper

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

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Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP Specifications

CWDM-SFP-1490-20 is a 1G CWDM SFP module operating at a 1490nm wavelength for data rates up to 1.25Gbps. Equipped with a CWDM DFB laser and a PIN photo detector, it delivers reliable single-mode fiber transmission over distances up to 20km. The module also features real-time digital diagnostic monitoring (DDM) to simplify network management and operates seamlessly within a standard 0 to +70°C temperature range.

Cisco Part Number	CWDM-SFP-1490-20	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1490nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-5 to 0dBm	RX Power	-26 to -1dBm
Receiver Sensitivity	-24dBm	Receiver Overload	-1dBm
EMC (Electromagnetic Compatibility)	Supported	DDM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFP MSA、SFF-8472

Key Features of Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP

Cisco CWDM-SFP-1490-20 Compatible LINK-PP provides a reliable 1G optical networking solution designed for single-mode fiber applications. This 1G SFP module combines CWDM technology, 1490nm wavelength, and real-time digital monitoring to deliver efficient data transmission up to 20km.

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP Optical Module

CWDM-SFP-1490-20 module features a hot-pluggable SFP footprint that allows easy installation without shutting down system power. The transceiver fully complies with SFP MSA standards to ensure broad interoperability across various networking equipment.

CWDM-SFP-1490-20: 1 Gbps Connectivity for Campus Distribution Links

Delivering a stable data rate of 1Gbps, this transceiver meets the core bandwidth requirements of modern distribution networks. The optical device is ideal for connecting switches and routers across campus environments or enterprise networks.

CWDM-SFP-1490-20 Module with CWDM Technology for Fiber Efficiency

Coarse Wavelength Division Multiplexing enables multiple data channels over a single fiber strand to maximize existing cable capacity. This advanced technology helps network operators expand bandwidth significantly without laying new optical cables.

CWDM-SFP-1490-20 Module with 1490nm Wavelength

Operating at a precise 1490nm optical wavelength, this module guarantees stable laser transmission over long distances. This specific channel helps minimize signal interference when used alongside other CWDM channels in the network.

CWDM-SFP-1490-20 Module Supporting 20km Transmission

Long-distance capability allows data signals to reach targets up to 20km over standard single-mode fiber. This extended range effectively connects separate buildings, remote data centers, and distant network nodes.

CWDM-SFP-1490-20 Module with Duplex LC Interface

Equipped with a standard duplex LC connector, this optical module ensures fast, secure, and reliable fiber optic patch cord connections. The widely adopted dual-fiber design provides dedicated channels for simultaneous transmitting and receiving.

CWDM-SFP-1490-20 Module with DDM for Real-Time Monitoring

Integrated Digital Diagnostics Monitoring (DDM) provides real-time tracking of critical operating metrics, including temperature, optical power, bias current, and supply voltage. Fully compliant with SFF-8472 standards, this diagnostic feature enables early fault detection and ensures consistent network performance.

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP Certification

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G CWDM SFP module meets strict international standards, holding industry certifications such as ISO 9001, CE, RoHS, and FCC. These compliance credentials guarantee that every transceiver is manufactured safely, environmentally friendly, and built to reliable quality levels.

CWDM-SFP-1490-20 Quality Testing Program

Every CWDM module undergoes rigorous factory testing before shipment to verify optical signal stability and long-term durability. Engineers test each unit under real-world traffic conditions to ensure zero packet loss and error-free transmission.

CWDM-SFP-1490-20 Quality Certifications

Full compliance with international production standards confirms that the transceiver meets required electromagnetic compatibility and environmental safety regulations. These official regulatory approvals verify that the module adheres to standard hardware manufacturing and safety protocols.

CWDM-SFP-1490-20 Certified for Reliable Host-Device Compatibility

Extensive interoperability checks ensure flawless operation with major brand switches, routers, and optical equipment. Users can seamlessly plug the transceiver into existing network hardware without encountering firmware errors or link recognition issues.

Rigorous Testing Ensures Reliable SFP Performance

LINK-PP subjects every CWDM-SFP-1490-20 CWDM SFP module to multi-stage validation to guarantee rock-solid optical integrity and continuous uptime. Learn more about our complete hardware verification standards at the LINK-PP Test Support Center.

Rigorous Testing Ensures Reliable Transceiver Performance

Optical Spectrum Test

Measure exact 1490nm wavelength accuracy and suppression.

Eye Pattern Test

Evaluate signal cleanliness and receiver jitter tolerances.

Bit Error Rate Test

Validate zero packet loss during maximum payload throughput.

Temperature Test

Benchmark thermal stability across commercial operating ranges.

Product Shipping for Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP

LINK-PP ensures safe product transit through specialized protective packaging and efficient logistics workflows. Every shipment is handled meticulously to maintain module integrity from dispatch to final delivery.

Anti-Static Protective Packaging

Neutralize static electricity threats during handling and transit.

Shock-Resistant Transport Protection

Cushion modules against physical vibration and handling impact.

Fast Order Processing and Dispatch

Expedite warehouse fulfillment to ensure prompt cargo departure.

Global Logistics and International Delivery

Fast worldwide delivery of transceivers through leading global carriers.

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP Usage Demonstration

Simply insert the Cisco CWDM-SFP-1490-20 Compatible LINK-PP module into an active SFP slot, connecting LC fiber patch cords to a 1490nm CWDM Mux/Demux port. This hot-pluggable deployment effortlessly aggregates bandwidth across campus distribution links, establishing reliable 20km single-mode interconnections without disrupting neighboring network traffic.

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP Usage Demonstration

CWDM-SFP-1490-20 Technical Support

LINK-PP offers end-to-end technical support, from pre-sales consultation to post-deployment assistance, ensuring smooth integration and reliable network performance.

Pre-Sales Technical Consultation

Professional guidance to help you select the optimal CWDM-SFP-1490-20 module for your network design and application needs.

Compatibility Verification Support

Validated compatibility with LINK-PP switches and other mainstream networking platforms for seamless deployment.

Deployment & Installation Assistance

Comprehensive step-by-step guidance for installation, configuration, and initial setup, ensuring accurate deployment and reliable, stable operation from the start.

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle, delivering long-term stability for enterprise and carrier-grade networks.

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP After-Sales Assurance

LINK-PP provides after-sales support for the smooth deployment and reliable operation of the optical modules.

15-day no-reason return and refund

Free replacement for dead-on-arrival (DOA) or defective items within the initial period

Free repair services for manufacturing defects throughout the warranty period

Warranty exclusions and conditions apply

Model Comparison Table

	Current Model LS-CW491G-20C Wavelength: 1490nm	LS-CW491G-40C Wavelength: 1490nm	LS-CW491G-80C Wavelength: 1490nm	LS?CW491G?40C Wavelength: 1490nm	LS-CW471G-40C Wavelength: 1470nm	LS-CW611G-40C Wavelength: 1610nm

Compatible	Cisco	Cisco	Cisco	Cisco	Cisco	Cisco
Data Rate (Max)	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps	1.25Gbps
Wavelength	1490nm	1490nm	1490nm	1490nm	1470nm	1610nm
Connector	Duplex LC	Duplex LC	Duplex LC	Duplex LC	Duplex LC	Duplex LC
Cable Distance (Max)	20km	40km	80km	40km	40km	40km
Cable Type	SMF	SMF	SMF	SMF	SMF	SMF
TX Power	-5 to 0dBm	-5 to 0dBm	-1 to +4dBm	-5 to 0dBm	-5 to 0dBm	-5 to 0dBm
Receiver Sensitivity	-24dBm	-24dBm	-26dBm	-24dBm	-24dBm	-24dBm
Operating Temperature	0 to 70°C	0 to 70°C	0 to 70°C	0 to 70°C	0 to 70°C	0 to 70°C
Vendor Name	LINK-PP	LINK-PP	LINK-PP	LINK-PP	LINK-PP	LINK-PP
Cisco Part Number	CWDM-SFP-1490-20	CWDM-SFP-1490	CWDM-SFP-1490	CWDM-SFP-1490	CWDM-SFP-1470	CWDM-SFP-1610
Temperature	Commercial	Commercial	Commercial	Commercial	Commercial	Commercial
Form Factor	SFP	SFP	SFP	SFP	SFP	SFP
Transmitter Type	DFB	DFB	DFB	DFB CWDM	DFB	DFB
Receiver Type	PIN	PIN	PIN	PIN	PIN	PIN
Receiver Overload	-1dBm	-1dBm	-1dBm	-1dBm	-1dBm	-1dBm
EMC (Electromagnetic Compatibility)	Supported	Supported	Supported		Supported	Supported
DDM Support	Yes				Yes
Protocols	SFP MSA、SFF-8472	SFP MSA、SFF-8472	SFP MSA、SFF-8472	SFP MSA、SFF-8472	SFP MSA、SFF-8472	SFP MSA、SFF-8472

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Q: Do I need to use the exact same 1490nm wavelength transceiver on both ends of the fiber link? By E***s on 2026-05-13

A: Yes. For standard point-to-point single-mode connections, both ends must use matching 1490nm transceivers. If you are using a CWDM Mux/Demux system, make sure both sides connect to the dedicated 1490nm multiplexer channel ports. By admin on 2026-05-14
Q: What kind of fiber patch cord do I need to connect this 1490nm CWDM SFP module? By C***e on 2026-03-01

A: You will need a standard single-mode fiber patch cable with duplex LC connectors. This module is designed specifically for single-mode fiber and will not work over multimode fiber. By admin on 2026-03-02
Q: Can I plug this 1G SFP module directly into my existing passive CWDM Mux/Demux panel? By R***n on 2025-11-16

A: Yes. As long as your CWDM multiplexer has a dedicated 1490nm channel port and standard duplex LC connections, this module connects directly to expand your fiber capacity without interfering with other wavelength channels. By admin on 2025-11-17
Q: How do I check if the optical signal is healthy after plugging the module into my switch? By B***l on 2025-06-04

A: This LS-CW491G-20C module includes built-in DDM (Digital Diagnostic Monitoring). You can easily check the live transmit power, receive light level, operating temperature, and voltage directly through your switch web interface or command line. By admin on 2025-06-05
Q: Can this 1490nm SFP module run alongside other CWDM wavelengths (like 1470nm, 1510nm, or 1530nm) on the same dark fiber? By E***l on 2025-02-21

A: Yes. This transceiver is designed with a narrow-band DFB laser specific to the 1490nm ITU grid. It can easily share the same single-mode fiber with other CWDM channels when connected through a standard passive CWDM Mux/Demux. By admin on 2025-02-22

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A***s

Taiwan, Province of China

Verified Purchase

5 .0

2026-06-22

Standardized on LINK-PP 1490nm CWDM modules for our multi-tenant office building interconnects. Low power consumption, clean fiber latch mechanism, and crisp DDM diagnostic feedback.

45 Helpful vote Comments

E***y

Turkey

Verified Purchase

5 .0

2026-06-05

DDM readings are accurate on SFF-8472.

43 Helpful vote Comments

A***n

Turkey

Verified Purchase

5 .0

2026-05-18

Perfect solution for our campus optical backbone upgrade. We multiplexed four 1G channels over a single SMF pair using this 1490nm alongside 1510/1530/1550nm optics. Optical power budget matched factory datasheet specs precisely (-3.1 dBm TX / -18.4 dBm RX). Effortless deployment from start to finish ;)

82 Helpful vote Comments

S***s

Denmark

Verified Purchase

5 .0

2026-05-03

Paired two of these LS-CW491G-20C SFP modules with our 8-channel passive CWDM Mux/Demux. Duplex LC seated snugly, and link came up immediately at full gigabit rate without manual negotiation tweaks.

82 Helpful vote Comments

A***n

India

Verified Purchase

5 .0

2026-04-28

Slipped this into a remote access point uplink box. The PIN receiver handles minor attenuation variations along the path cleanly, keeping signal locked 24/7 =D

79 Helpful vote Comments

C***s

Israel

Verified Purchase

5 .0

2026-03-14

Great 1490nm CWDM SFP, works flawlessly.

35 Helpful vote Comments

M***n

Bangladesh

Verified Purchase

5 .0

2026-01-30

Plugged right into our aggregation switches with no setup hassle. The link connected immediately and signal has been completely stable. Great value for the price :)

98 Helpful vote Comments

A***s

Brunei Darussalam

Verified Purchase

4 .0

2026-01-10

Solid gigabit link with zero packet loss so far. Shipping took three days longer than expected due to customs delay, but the hardware quality is definitely worth the wait.

23 Helpful vote Comments

W***r

Brunei Darussalam

Verified Purchase

5 .0

2025-11-14

Tested extensively in our lab before rolling out to 18 remote sub-stations. The DFB laser maintains wavelength stability without drifting into adjacent passbands. DDM voltage and temperature readouts aligned perfectly with calibrated bench meters. Reliable performance for business-critical uplinks.

91 Helpful vote Comments

E***z

Cambodia

Verified Purchase

5 .0

2025-10-26

Clean DFB laser output, zero bit drops.

52 Helpful vote Comments

M***z

Netherlands

Verified Purchase

4 .0

2025-10-05

The 1490nm CWDM optical module performs great on our 15km fiber run, but the outer cardboard box arrived slightly dented. The module inside was well-cushioned and intact :)

35 Helpful vote Comments

B***t

Hong Kong

Verified Purchase

5 .0

2025-08-02

Built a dedicated low-latency SAN replication link between two branch data centers 17km apart. Optical attenuation measured around 7.2 dB through patch panels, and this optic maintained a rock-solid -14 dBm RX level. No frame drops or packet retransmissions observed during heavy iSCSI stress tests. Truly reliable hardware.

144 Helpful vote Comments

G***z

India

Verified Purchase

5 .0

2025-07-24

Used for municipal CCTV fiber backhaul over single-mode lines. Excellent receiver sensitivity (-24 dBm measured at terminal node) and zero CRC errors logged over two weeks of continuous run :-)

127 Helpful vote Comments

S***r

Israel

Verified Purchase

5 .0

2025-06-13

Deployed this 1G CWDM 1490nm SFP transceiver into our edge aggregation rack. Optical power sits right at -2.8 dBm TX and -16 dBm RX across an 11km single-mode run. Smooth install ;)

114 Helpful vote Comments

A***l

Malaysia

Verified Purchase

5 .0

2025-04-22

Swapped out our old modules for these and got full gigabit speeds right away. They stay cool in the server rack, draw very little power, and maintain a rock-solid fiber link without any extra tweaking. Definitely a smooth and easy upgrade :D

138 Helpful vote Comments

E***a

Singapore

Verified Purchase

5 .0

2025-04-01

Perfect 1.25G link over 14km fiber.

42 Helpful vote Comments

C***z

Indonesia

Verified Purchase

5 .0

2025-03-11

Solid thermal stability inside our indoor server cabinet. Even under continuous high-throughput file sync, casing temp hovers around 38°C, well below the 70°C threshold.

89 Helpful vote Comments

T***l

Norway

Verified Purchase

5 .0

2025-02-17

Upgraded our enterprise distribution loop with these 20km SMF optics. Real-time DOM telemetry works seamlessly in our NMS, reporting stable temps and normal bias current :D

90 Helpful vote Comments

Verified Purchase

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SGD 64.77 ~~SGD 0.00~~

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921 Sold

SGD 64.77 ~~SGD 0.00~~

{"pid":492298,"minimum_ordered_quantity":1,"skulist":[{"pskuid":225375,"cid":752,"pid":492298,"sku":"225375","psvid1":330347,"psvid2":330348,"psvid3":0,"psvid4":0,"left_num":200,"price":"51.000","strike_price":"0.000","innercode":"","addtime":"2026-09-01 18:19:15","uptime":"2026-09-01 18:19:15","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"51","subtotal":51}]}
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{"pid":492694,"minimum_ordered_quantity":1,"skulist":[{"pskuid":224832,"cid":752,"pid":492694,"sku":"224832","psvid1":329261,"psvid2":329262,"psvid3":0,"psvid4":0,"left_num":246,"price":"50.000","strike_price":"0.000","innercode":"","addtime":"2026-08-26 20:06:56","uptime":"2026-08-26 20:06:56","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"50","subtotal":50}]}
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{"pid":492146,"minimum_ordered_quantity":1,"skulist":[{"pskuid":225474,"cid":752,"pid":492146,"sku":"225474","psvid1":330545,"psvid2":330546,"psvid3":0,"psvid4":0,"left_num":227,"price":"50.000","strike_price":"0.000","innercode":"","addtime":"2026-09-01 18:45:46","uptime":"2026-09-01 18:45:46","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"50","subtotal":50}]}
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{"pid":492196,"minimum_ordered_quantity":1,"skulist":[{"pskuid":225428,"cid":752,"pid":492196,"sku":"225428","psvid1":330453,"psvid2":330454,"psvid3":0,"psvid4":0,"left_num":216,"price":"50.000","strike_price":"0.000","innercode":"","addtime":"2026-09-01 18:32:55","uptime":"2026-09-01 18:32:56","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"50","subtotal":50}]}
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{"pid":492120,"minimum_ordered_quantity":1,"skulist":[{"pskuid":225439,"cid":752,"pid":492120,"sku":"225439","psvid1":330475,"psvid2":330476,"psvid3":0,"psvid4":0,"left_num":148,"price":"50.000","strike_price":"0.000","innercode":"","addtime":"2026-09-01 18:34:49","uptime":"2026-09-01 18:34:49","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"50","subtotal":50}]}

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Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP CWDM 1490nm 20km Duplex LC DDM SMF Optical Transceiver Module

Product summary

Product Details

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP Specifications

Key Features of Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP Optical Module

CWDM-SFP-1490-20: 1 Gbps Connectivity for Campus Distribution Links

CWDM-SFP-1490-20 Module with CWDM Technology for Fiber Efficiency

CWDM-SFP-1490-20 Module with 1490nm Wavelength

CWDM-SFP-1490-20 Module Supporting 20km Transmission

CWDM-SFP-1490-20 Module with Duplex LC Interface

CWDM-SFP-1490-20 Module with DDM for Real-Time Monitoring

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP Certification

CWDM-SFP-1490-20 Quality Testing Program

CWDM-SFP-1490-20 Quality Certifications

CWDM-SFP-1490-20 Certified for Reliable Host-Device Compatibility

Rigorous Testing Ensures Reliable SFP Performance

Optical Spectrum Test

Eye Pattern Test

Bit Error Rate Test

Temperature Test

Product Shipping for Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP

Anti-Static Protective Packaging

Shock-Resistant Transport Protection

Fast Order Processing and Dispatch

Global Logistics and International Delivery

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP Usage Demonstration

CWDM-SFP-1490-20 Technical Support

Pre-Sales Technical Consultation

Compatibility Verification Support

Deployment & Installation Assistance

Long-Term Technical Assurance

Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1.25G SFP After-Sales Assurance

Model Comparison Table

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Cisco CWDM-SFP-1490-20 Compatible LINK-PP 1G SFP CWDM 1490nm 20km Duplex LC DDM SMF Optical Transceiver Module

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