We already have 1470nm, 1510nm, 1530nm, and 1570nm channels running on our passive CWDM Mux/Demux. Can we plug this 1550nm module straight into the open channel slot?

Yes, absolutely. 1550nm is a standard channel on the ITU-T G.694.2 CWDM grid with a 20nm channel spacing. As long as your Mux/Demux filter unit has a dedicated 1550nm port available (and you match it with a 1550nm CWDM transceiver at the remote end), the LS-CW5510-40C will integrate seamlessly without causing crosstalk or interfering with your existing wavelengths.

We have existing OS2 single-mode fiber and duplex LC patch cords. Is this module compatible with our cabling?

Yes. This module is designed for single-mode fiber transmission and uses a duplex LC optical interface. OS2 fiber is commonly used for long-distance 10G CWDM links and is suitable for this 40 km module.

Is the 0–70°C rating the ambient temperature or the module case temperature?

The stated specification is the operating case temperature of the module. Since internal switch heat and airflow can make the module case warmer than the surrounding air, it is important to leave sufficient thermal margin in high-density equipment.

Our fiber route is 32km, with several splices and patch panels. Is the 40km distance enough?

The 40km rating is based on a standard optical link budget, not only the physical fiber length. Please include fiber attenuation, connector loss, splice loss, and CWDM MUX/DEMUX insertion loss when calculating the total link loss; this is the best way to confirm whether the link has enough margin.

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Cisco CWDM-SFP10G-1550 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module

Name: Cisco CWDM-SFP10G-1550 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 221935
Price: 220.16 USD
Availability: InStock
Rating: 4.9 (36 reviews)

# 221935

Product: Cisco CWDM-SFP10G-1550 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
SKU: 221935
P/N: LS-CW5510-40C
Price: $ 256
Stock: 419 in Stock
Sold: 599
Product URL: https://www.l-p.com/products/484226.htm

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Compatible:: Cisco; LINK-PP; Alcatel-Lucent; Brocade; Ciena; Dell; FS; Generic; H3C; HPE; 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-SFP10G-1550 Compatible LINK-PP 10G SFP+ Specifications

CWDM-SFP10G-1550 employs a cooled EML transmitter and PIN receiver at a 1550nm CWDM wavelength, supporting extended 40 km SMF links through a duplex LC interface, and incorporates real-time DOM features to monitor module status and optical performance.

Cisco Part Number	CWDM-SFP10G-1550	Vendor Name	LINK-PP
Form Factor	SFP+	Max Data Rate	10.7Gbps
Wavelength	1550nm	Max Cable Distance	40km
Connector	Duplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	PIN
TX Power	-1 to +5dBm	RX Power	-23 to -6dBm
Receiver Sensitivity	-16dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFP+ MSA Compliant, SFF 8472,SFF 8431,802.3ae, ITU-T

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Q: We already have 1470nm, 1510nm, 1530nm, and 1570nm channels running on our passive CWDM Mux/Demux. Can we plug this 1550nm module straight into the open channel slot? By Q***d on 2026-04-01

A: Yes, absolutely. 1550nm is a standard channel on the ITU-T G.694.2 CWDM grid with a 20nm channel spacing. As long as your Mux/Demux filter unit has a dedicated 1550nm port available (and you match it with a 1550nm CWDM transceiver at the remote end), the LS-CW5510-40C will integrate seamlessly without causing crosstalk or interfering with your existing wavelengths. By admin on 2026-04-02
Q: We have existing OS2 single-mode fiber and duplex LC patch cords. Is this module compatible with our cabling? By O***n on 2026-01-09

A: Yes. This module is designed for single-mode fiber transmission and uses a duplex LC optical interface. OS2 fiber is commonly used for long-distance 10G CWDM links and is suitable for this 40 km module. By admin on 2026-01-10
Q: Is the 0–70°C rating the ambient temperature or the module case temperature? By N***s on 2025-10-11

A: The stated specification is the operating case temperature of the module. Since internal switch heat and airflow can make the module case warmer than the surrounding air, it is important to leave sufficient thermal margin in high-density equipment. By admin on 2025-10-12
Q: Our fiber route is 32km, with several splices and patch panels. Is the 40km distance enough? By P***y on 2025-08-18

A: The 40km rating is based on a standard optical link budget, not only the physical fiber length. Please include fiber attenuation, connector loss, splice loss, and CWDM MUX/DEMUX insertion loss when calculating the total link loss; this is the best way to confirm whether the link has enough margin. By admin on 2025-08-19

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C***s

Belarus

Verified Purchase

5 .0

2026-05-27

Needed a reliable 10G CWDM SFP+ transceiver for an enterprise backhaul link. The 1550nm wavelength channel works perfectly within our passive coarse wavelength division multiplexing filter arrays. No thermal throttling or optical drift noticed under 10-Gigabit workloads.

102 Helpful vote Comments

S***n

Belgium

Verified Purchase

5 .0

2026-03-06

Clean optical spectrum, zero frame loss on our backbone ring.

78 Helpful vote Comments

N***s

Macao

Verified Purchase

4 .0

2026-02-16

Reliable 10GbE CWDM performance and fair value for a 1550nm 40km single-mode module. We would prefer more individual box cushioning for overseas bulk shipments, but the optics themselves arrived functional and tested well.

21 Helpful vote Comments

D***s

Argentina

Verified Purchase

5 .0

2026-01-25

We used this 40km SFP+ CWDM module for an indoor aggregation point supporting a remote network location. The EML transmitter and 1550nm wavelength matched the fiber design, while the digital diagnostics gave us useful confirmation during initial testing. It is especially helpful when field teams need to check light levels remotely after a maintenance change. The module has stayed online under continuous traffic without any unusual alarms.

107 Helpful vote Comments

C***n

Israel

Verified Purchase

5 .0

2025-12-14

We deployed several 1550nm CWDM SFP+ modules in a regional fiber aggregation project. Link establishment was fast, the EML CWDM optics stayed stable, and the DOM data was useful during commissioning.

78 Helpful vote Comments

L***t

Romania

Verified Purchase

5 .0

2025-11-26

Real-time optical Tx/Rx power readings match our optical power meter within ±0.2dBm.

60 Helpful vote Comments

L***e

Maldives

Verified Purchase

4 .0

2025-11-02

Modules initialize fast and maintain stable optical signal over single-mode fiber infrastructure. Delivery took an extra day due to local courier clearance, but this 10G CWDM module quality is top tier.

67 Helpful vote Comments

C***s

Austria

Verified Purchase

5 .0

2025-09-24

Stable link at 40km with no surprises — exactly what we needed.

69 Helpful vote Comments

F***s

Libyan Arab Jamahiriya

Verified Purchase

4 .0

2025-09-08

Good price-to-performance for a commercial-grade 1550nm CWDM transceiver. We tested the optical levels before delivery to our customer; everything passed, though the shipping carton arrived a little scuffed.

25 Helpful vote Comments

O***n

Japan

Verified Purchase

5 .0

2025-08-21

For a phased network expansion, we needed 1550nm 10G CWDM optics that could be deployed in batches without adding complexity for the operations team. These modules arrived ready for standard SFP+ installation, and our technicians could verify TX/RX optical information from the equipment during acceptance checks. The 40km single-mode fiber capability gives us flexibility for future remote-site links, even though our current runs are shorter. Overall, it is a practical optical module for indoor telecom rooms, equipment racks, and enterprise fiber infrastructure.

122 Helpful vote Comments

A***n

Denmark

Verified Purchase

5 .0

2025-08-12

We deployed a full batch of these 10G SFP+ 40km 1550nm CWDM modules to interconnect two office parks across town. The optical receivers locked on instantly over leased single-mode fiber infrastructure. Transceiver optical diagnostic monitoring gives us complete visibility into receiver power margins without pulling extra tools. Perfect price-to-performance ratio for enterprise expansion.

94 Helpful vote Comments

J***d

Cambodia

Verified Purchase

5 .0

2025-07-18

Bought these for a high-density 10G switch cluster linking two remote distribution facilities. The 1550nm CWDM wavelength alignment is precise, avoiding channel crosstalk on our multiplexer trays. Excellent value for enterprise deployment.

91 Helpful vote Comments

C***e

New Zealand

Verified Purchase

5 .0

2025-07-09

DOM readings came up right away and the duplex LC fit was clean.

51 Helpful vote Comments

G***y

Bulgaria

Verified Purchase

5 .0

2025-05-01

Upgraded our regional node transport layer using these 1550nm CWDM SFP+ modules. The duplex LC interface clicked firmly into place with zero slop. Link attenuation stayed well within budget over 28km of older outdoor fiber plant. Will order another 50 units for next month’s metro network expansion.

123 Helpful vote Comments

D***h

Ireland

Verified Purchase

5 .0

2025-03-25

This 40km CWDM 10G SFP+ module worked well for our remote office uplink. We checked TX and RX values through the switch diagnostics and had enough visibility to document the handoff properly.

92 Helpful vote Comments

W***s

Turkey

Verified Purchase

5 .0

2025-02-13

Great prices, very quick shipping.

52 Helpful vote Comments

V***n

Australia

Verified Purchase

5 .0

2025-01-24

Very satisfied with customer service.

49 Helpful vote Comments

N***i

Romania

Verified Purchase

5 .0

2025-01-09

Right product that is compatible with my switches; Fast delivery.

94 Helpful vote Comments

M***l

United States

Verified Purchase

5 .0

2024-12-31

Is great i have the product and works perfectly i am satisfied with the product the deliver was very well

59 Helpful vote Comments

S***k

Israel

Verified Purchase

5 .0

2024-11-29

I chose l-p.com because of its Fast delivery and cheap price. Of course, it didn't let me down after receiving the goods.

29 Helpful vote Comments

N***r

Belgium

Verified Purchase

5 .0

2024-11-16

I love how affordable the products are!

86 Helpful vote Comments

A***i

United States

Verified Purchase

5 .0

2024-09-29

Product works as described. I have done business with them all in the past and have always had successful outcomes.

42 Helpful vote Comments

M***n

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-09-20

Great item good price quick shipping. Been a customer in the past and will in the future.

66 Helpful vote Comments

A***a

United States

Verified Purchase

5 .0

2024-08-22

Excellent service. 10/25/40G Transceiver Modules arrived Faster than expected, appropriately packaged, and have significantly improved data transfer speed.

56 Helpful vote Comments

L***l

United States

Verified Purchase

5 .0

2024-08-05

best place to shop

43 Helpful vote Comments

M***t

Russian Federation

Verified Purchase

5 .0

2024-06-28

I'm very happy with my transaction and purchase. The Optical Transceiver Module works with no issue. I would definitely recommend this company for customer service and speed. I will be purchasing from them again in the future.

74 Helpful vote Comments

S***v

United States

Verified Purchase

5 .0

2024-06-12

I have received the order, and your shipping time is out of expected. And the 10/25/40G Transceiver Modules are functioning just as expected. we have always been satisfied with our equipment from you.

17 Helpful vote Comments

N***z

Hong Kong

Verified Purchase

5 .0

2024-05-20

I checked out l-p.com references on several forums and it had nothing but good reviews.

75 Helpful vote Comments

J***a

United States

Verified Purchase

5 .0

2024-05-16

Excellent, Fast service. I will definitely order from there again.

56 Helpful vote Comments

R***e

Norway

Verified Purchase

5 .0

2023-12-07

LINK-PP is the most user-friendly website I have ever found. It has very knowledgeable staff and offers various good products at a reasonable price. Also, the Fast delivery has helped me save a lot of time.

56 Helpful vote Comments

H***e

Italy

Verified Purchase

5 .0

2023-11-10

Very good for crimping, not bad for cutting,

24 Helpful vote Comments

B***o

Romania

Verified Purchase

5 .0

2023-10-21

Hassle Free with quality merchandise.

65 Helpful vote Comments

B***o

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2023-08-27

Great quality, price and easy to navigate website.

51 Helpful vote Comments

V***n

Norway

Verified Purchase

5 .0

2023-07-21

It was supposed to work before but because of the issue I faced, I made an assumption. I was wrong, but later tests I ran made me re-evaluate. Actually, your Optical Transceiver Module allows me to support alternatives that were not available previously. I do not know why it was not working initially. But I'm all to happy to have it all working now.

64 Helpful vote Comments

I***i

Philippines

Verified Purchase

5 .0

2023-04-03

The 10/25/40G Transceiver Modules arrived on time with good packaging. And it was exactly as expected. Works perfectly and no issues. Everything is great and I will definitely use l-p.com again!

40 Helpful vote Comments

M***r

Nepal

Verified Purchase

5 .0

2023-03-01

The website is user friendly, I can find what I need easily. And the service is great, they answered all my questions patiently. Enjoy doing business with you!

42 Helpful vote Comments