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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H3C CWDM-SFP10G-1550-40 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module

Name: H3C CWDM-SFP10G-1550-40 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 221939
Price: 220.16 USD
Availability: InStock
Rating: 4.9 (31 reviews)

# 221939

Product: H3C CWDM-SFP10G-1550-40 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
SKU: 221939
P/N: LS-CW5510-40C
Price: $ 256
Stock: 428 in Stock
Sold: 658
Product URL: https://www.l-p.com/products/484231.htm

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Manufacture: LINK-PP

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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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H3C CWDM-SFP10G-1550-40 Compatible LINK-PP 10G SFP+ Specifications

CWDM-SFP10G-1550-40 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.

H3C Part Number	CWDM-SFP10G-1550-40	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

A***r

Turkey

Verified Purchase

5 .0

2026-04-13

Ordered these for a small data center expansion where we needed 10GbE over existing SMF. The duplex LC CWDM optics transceivers were individually protected, installed without issue, and showed stable optical power levels after burn-in.

87 Helpful vote Comments

J***n

Lithuania

Verified Purchase

4 .0

2026-03-31

Performance has been good on our 40km SMF test path, and the module feels like good value for routine enterprise deployments. I would just like more outer-box padding for small quantities.

16 Helpful vote Comments

A***h

Finland

Verified Purchase

5 .0

2026-02-07

Great value for a 1550nm CWDM 10G SFP+ long-reach optical module.

74 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

N***r

United Arab Emirates

Verified Purchase

5 .0

2025-12-28

We staged a set of these 10G CWDM optical transceivers before installing them in customer-facing racks. Every unit established a stable 10Gbps connection on our single-mode fiber test setup, and the duplex LC interface worked with the patching already in place. The commercial 0–70°C operating range is appropriate for our climate-controlled facility. For standard long-distance data center interconnect work, the build quality and optical performance have met expectations.

135 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

H***n

Indonesia

Verified Purchase

5 .0

2025-10-22

Solid 1550nm 10G CWDM SFP+ modules for our inter-building fiber link.

68 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

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

R***n

Nepal

Verified Purchase

5 .0

2025-06-08

We deployed the LS-CW5510-40C CWDM module on a 10GbE campus backbone carrying virtualization, voice, and security traffic between buildings. Our single-mode route is well below the 40km maximum, but we selected the 1550nm CWDM optic to align with the existing wavelength plan. DOM was available immediately for checking transmit power, receive power, module temperature, and supply status during turn-up. After several weeks of normal traffic, the link has remained stable with no unexpected errors.

122 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

K***n

Morocco

Verified Purchase

4 .0

2025-04-15

The module passed our indoor rack test and worked well in a multi-device deployment. Delivery was safe overall, although the outer carton had minor compression from transit.

28 Helpful vote Comments

N***t

Poland

Verified Purchase

5 .0

2025-04-07

Plugged in, linked at 10Gbps, and diagnostics looked normal.

54 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

R***n

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-03-12

Our requirement was to carry 10G traffic across a leased dark-fiber route while preserving capacity for other CWDM wavelengths. This LS-CW5510-40C 1550nm SFP module fit the channel plan correctly and gave us the long-reach margin needed for the route. During commissioning, we used the module’s DDM information to verify optical conditions at both endpoints instead of relying only on link status. That saved time when documenting the circuit for handover.

146 Helpful vote Comments

W***s

Turkey

Verified Purchase

5 .0

2025-02-13

Great prices, very quick shipping.

52 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

B***i

Lithuania

Verified Purchase

5 .0

2024-09-12

Items delivered on time and buying experience was smooth and seamless.

77 Helpful vote Comments

G***f

United States

Verified Purchase

5 .0

2024-08-30

Always friendly and reliable.

28 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

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

C***l

Taiwan, Province of China

Verified Purchase

5 .0

2023-09-08

Your web site is easy to understand and get around

31 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

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

J***m

Ukraine

Verified Purchase

5 .0

2023-02-18

Great ricing, awesome customer service!!

17 Helpful vote Comments