The LINK-PP LS-CW311G-40C 1G SFP module delivers stable data transmission at rates up to 1.25 Gbps over single-mode fiber (SMF), supporting link distances of up to 40 km. Operating at the 1310 nm CWDM wavelength, it enables efficient wavelength multiplexing.
LINK-PP Part Number
LS-CW311G-40C
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
1.25Gbps
Wavelength
1310nm
Max Cable Distance
40km
Connector
Duplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
PIN
TX Power
-5 to 0dBm
RX Power
-26 to -1dBm
Receiver Sensitivity
-24dBm
DDM/DOM
Supported
Operating Temperature Range
0 to 70°C
Protocols
SFP MSA, SFF-8472
Key Features of LINK-PP LS-CW311G-40C 1G SFP
Designed for seamless plug-and-play deployment, the LINK-PP LS-CW311G-40C 1G SFP module leverages its duplex LC interface, CWDM capability, and integrated Digital Optical Monitoring (DOM) to deliver reliable long-haul connectivity for Gigabit Ethernet deployments.
LINK-PP LS-CW311G-40C 1G SFP Optical Module
Featuring a high-performance CWDM DFB laser transmitter and a PIN photodetector receiver, the LINK-PP LS-CW311G-40C ensures consistent network performance across extended distances by providing stable optical output, reducing dispersion, and maintaining low bit error rates.
LS-CW311G-40C: Reliable 1.25 Gbps Connectivity for Network Expansion
The LINK-PP LS-CW311G-40C transceiver supports standard Gigabit Ethernet (1.25 Gbps) applications and is perfect for expanding enterprise, metro, and access networks, delivering dependable bandwidth for growing infrastructure demands.
LS-CW311G-40C Module with CWDM Technology for Fiber Efficiency
The LINK-PP LS-CW311G-40C optical module enhances fiber usage, decreases cabling needs, and lowers deployment costs by employing Coarse Wavelength Division Multiplexing (CWDM), which transmits multiple signals at distinct wavelengths over a single fiber.
LS-CW311G-40C Module with 1310nm Wavelength
This LINK-PP LS-CW311G-40C 1G SFP module operates at the 1310 nm wavelength, offering an optimal balance between transmission distance and signal attenuation, ensuring stable performance in long-range fiber links.
LS-CW311G-40C Module Supporting 40km Transmission
Operating over standard single-mode fiber, the LINK-PP LS-CW311G-40C 1G SFP transceiver achieves communication distances of up to 40 km, targeting campus networks, metro links, and long-distance backbone connections.
LS-CW311G-40C Module with Duplex LC Interface
The LINK-PP LS-CW311G-40C module includes a standard duplex LC interface, enabling for simple installation and interoperability with existing fiber infrastructure for efficient deployment and maintenance.
LS-CW311G-40C Module with DOM for Real-Time Monitoring
The onboard DOM design of the LINK-PP LS-CW311G-40C delivers actionable insights into key operating conditions, reducing downtime and strengthening network reliability.
LINK-PP LS-CW311G-40C 1G SFP Certification
Every LINK-PP module conforms to ISO 9001, CE, RoHS, and FCC standards, guaranteeing compliance with international standards for performance dependability, safety, and environmental protection.
Quality assurance testing helps confirm reliable signal transmission and long-term operational consistency.
LS-CW311G-40C Quality Certifications
Industry-recognized certifications confirm the LINK-PP module’s stability, reliability, and long-term service life.
This product is in conformity with ISO9001. This system is valid to a company engaging in development, production and supply service of fiber optical products. Please contact us to learn more.
ISO/IEC 27001 is an international standard for managing and processing information security. This standard is jointly developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It sets out requirements for establishing, implementing, maintaining, and continually improving an information security management system (ISMS). Ensuring the confidentiality, integrity, and availability of organizational information assets, obtaining an ISO 27001 certificate means that the enterprise has passed the audit conducted by a certification body, proving that its information security management system has met the requirements of the international standard. Please contact us to learn more.
This product is in conformity with ISO14001.It is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. Please contact us to learn more.
ISO 45001 is a global standard that sets out the requirements for an occupational health and safety management system (OH&SMS).
REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system. The regulation aims to protect human health and environmental safety, maintain and improve the competitiveness of the EU chemical industry, and develop innovative capabilities for non-toxic and harmless compounds to prevent market fragmentation, increase the transparency of the use of chemicals, promote non-animal experiments, and pursue sustainable social development.Please contact us to learn more.
This product meets the applicable requirements of Directive (EU) 2015/863 of RoHS. It restricts the use of 10 hazardous materials in the manufacture of various types of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and four different phthalates. Please contact us to learn more.
This product fully accords with the FCC, which aims to manage the radio wave and magnetic fields more reasonably. Please contact us to learn more.
CB is an international system operated by IECEE. This product is based on IEC standards for testing the safety performance of electrical products. Please contact us to learn more.
This product fully accords with UKCA (UK Conformity Assessed) certificate, which signifies that it meets all relevant quality standards as well as health and safety requirements. Please contact us to learn more.
UL certification is a non-mandatory certification in the United States,mainly testing and certification of product safety performance.Its ultimate purpose is to obtain products with a fairly safe level for the market,and to contribute to ensuring human health and property safety.Please contact us to learn more.
LS-CW311G-40C Certified for Reliable Host-Device Compatibility
This LS-CW311G-40C module, validated through comprehensive interoperability testing, offers flawless compatibility with LINK-PP equipment.
Rigorous Testing Ensures Reliable SFP Performance
Every SFP module is carefully inspected to confirm signal accuracy and long-term operational dependability. Refer to the LINK-PP Test Support Center for further details.
Optical Spectrum Test
Precise wavelength measurement ensures stable optical performance and standard-compliant operation.
Eye Pattern Test
Waveform clarity testing supports stable operation by ensuring strong and clean signal performance.
Bit Error Rate Test
BER checks verify strong communication reliability and secure information transfer.
Temperature Test
Performance under temperature variation is validated to support long-term network reliability.
Product Shipping for LINK-PP LS-CW311G-40C 1G SFP
Each LINK-PP module is sent fully deployment-ready through a well-managed logistics system that guarantees product safety and consistent global delivery performance.
Anti-Static Protective Packaging
Helps prevent static discharge damage by using professional anti-static packing solutions.
Shock-Resistant Transport Protection
Minimizes shipping impact and protects modules from handling-related damage.
Fast Order Processing and Dispatch
Supports efficient fulfillment with rapid order handling and shipping preparation.
Global Logistics and International Delivery
Ensures smooth overseas shipping through a dependable international network.
LINK-PP LS-CW311G-40C 1G SFP Usage Demonstration
Compact yet high-performing, the LINK-PP LS-CW311G-40C delivers reliable 1.25 Gbps transmission at a 1310 nm wavelength with reach up to 40 km over single-mode fiber. It is ideal for enterprise backbone networks, metropolitan area networks (MANs), fiber-to-the-building (FTTB) deployments, and telecom access systems requiring stable long-distance optical connectivity.
LS-CW311G-40C Technical Support
LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.
Pre-Sales Technical Consultation
Professional technical guidance to help customers select the most suitable LS-CW311G-40C modules based on network architecture and application requirements.
Compatibility Verification Support
Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.
Deployment & Installation Assistance
Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.
A:
It will usually link, but it is not ideal. Launch power is -5 to 0dBm and receiver overload is around -1dBm, so a 12km span with low loss can push you close to the overload point and cause errors under temperature change. A 5dB pad is the usual fix, and we recommend measuring receive power and keeping it between -8 and -18dBm. By
admin
A:
Only if the mux has a dedicated 1310 or wideband port. 1310nm is outside the standard CWDM channel grid, so it normally goes through a separate wideband port or a dual window device. Check the mux datasheet for a 1310 pass band before you plan the link, otherwise the insertion loss will be very high. By
admin
A:
Yes, they will carry 100Mbps traffic as long as the switch port supports 100BASE-FX or a compatible 100M optical mode. The optic itself is rate transparent up to 1.25Gbps. On older line cards we recommend fixing the port speed rather than using autonegotiation, because some legacy devices do not advertise 100M optical correctly. By
admin
Deployed 18 of these on a metro access layer where the previous optics were 80km parts used on 20km spans. We had been padding them down, which is wasteful. Moving to 40km optics removed the pads, simplified the bill of materials, and the links still show healthy receive power. Small change, real operational benefit.
Please write comments with more than three
character.
491902
579865
D***r
Hungary
Verified
Purchase
5 .0
2026-03-17
For fibre to the building work this is the module I keep coming back to. Most of our drops are 8 to 18km, so a 40km optic with -5 to 0dBm launch power fits our passive splitter budget better than an 80km part. I measured TX at -2.3dBm on three units, right in the middle of the spec. DDM temperature tracking has been useful in unheated street cabinets.
Please write comments with more than three
character.
491902
579867
A***r
Republic of Korea
Verified
Purchase
5 .0
2026-02-27
We use these for 20 to 30km access links from our POP out to customer sites. The 1310nm zero dispersion window and the 40km rating give us margin without paying for 80km parts.
Please write comments with more than three
character.
491902
579868
J***z
Australia
Verified
Purchase
5 .0
2026-01-02
I run maintenance for about 90km of access fibre and keep a stock of these as spares. They are interchangeable with our existing 1310nm 40km parts, which makes swap outs quick during an outage. The latch mechanism is metal and positive, not the flimsy plastic tab you get on some budget SFPs.
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character.
491902
579890
H***l
Austria
Verified
Purchase
5 .0
2025-12-14
We run a small regional ISP and price per port matters. These 1G SFP 1310nm modules cost noticeably less than the OEM equivalents and we have not seen a failure in the first 60 units over six months. What I check on arrival is the EEPROM vendor string, because our provisioning tool reads it. All reported consistently, so no surprises during rollout.
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491902
579886
S***n
Argentina
Verified
Purchase
5 .0
2025-11-05
Ordered ten for a regional ISP access ring. All tested clean at 1.25G for 24 hours. The metal housing feels solid compared to the plastic ones we had before.
Please write comments with more than three
character.
491902
579878
E***s
Norway
Verified
Purchase
5 .0
2025-10-20
Our access ring runs 28 to 36km between nodes, all single mode with a handful of splices. These 1310nm 40km modules hit the sweet spot, enough reach with real margin, but not so much launch power that we need pads on the short segments. Receive levels land between -16 and -19dBm. Eight months of operation, zero link flaps and no DOM alarms, and the price let us standardize across 40 sites.
Please write comments with more than three
character.
491902
579884
L***l
Cambodia
Verified
Purchase
5 .0
2025-09-22
We use these for connecting remote offices at 15 to 25km. The modules negotiate 1000BASE-X style links on our switches and the DOM page reports TX power, RX power and temperature correctly. Our NMS polls them every five minutes with no timeouts. I have had cheaper optics fail this test, so this is a good sign.
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character.
491902
579889
D***l
Malaysia
Verified
Purchase
5 .0
2025-09-06
The 40km reach is honest. I tested a 39.5km spool with 4dB of added attenuation and the link stayed error free at 1.25G for 12 hours, with receive power at -22dBm, still 2dB above the -24dBm sensitivity. That tells me these will survive a bad splice or a dirty connector in the field. Solid medium haul SFP for the money.
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character.
491902
579887
A***r
Libyan Arab Jamahiriya
Verified
Purchase
5 .0
2025-08-24
Used for a 40km inter building link at an industrial park. It has been through a full summer in a cabinet without air conditioning and still reports normal temperature and bias. =)
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character.
491902
579871
S***r
Italy
Verified
Purchase
4 .0
2025-07-23
Modules have been fine on our 30km links, but delivery took almost three weeks and the tracking number never updated. Support replied eventually. Product is good, logistics needs work.
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character.
491902
579893
M***y
Argentina
Verified
Purchase
5 .0
2025-06-17
We had a link that kept dropping at 35km with generic optics. Swapped to these and the BER cleared up. Turned out to be marginal receive power, and the -24dBm sensitivity fixed it.
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character.
491902
579869
E***s
France
Verified
Purchase
5 .0
2025-03-21
Used these in an industrial park distribution network with 12 nodes in a ring. Distances range from 6 to 31km, so we keep a couple of 5dB pads for the short hops. The 1310nm wavelength keeps chromatic dispersion low on our older fibre, and BER testing came back clean on all links.
Please write comments with more than three
character.
491902
579891
Z***z
Italy
Verified
Purchase
5 .0
2025-03-03
We bought a mix of these and the 80km version to cover different span lengths. The 40km part is our default for anything under 30km because the cost is lower and the link budget is easier to manage. Both use the same duplex LC interface, so patch cords and panels are shared.
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character.
491902
579892
E***h
Malaysia
Verified
Purchase
5 .0
2025-01-07
These 1G SFP modules came up on Cisco and Zyxel gear without issue. DOM values matched our power meter within 0.5dB, so I trust them for troubleshooting.
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character.
491902
579877
S***r
Mexico
Verified
Purchase
5 .0
2025-01-03
Bought these for a fibre to the building rollout. Most runs are under 15km, so the -24dBm sensitivity and the lower launch power are well matched to our splitter budget.
Please write comments with more than three
character.
491902
579882
D***l
Ireland
Verified
Purchase
5 .0
2024-04-23
Replaced some 80km optics that were overkill for our 22km span. These cost less and the link budget is actually better balanced, no need for attenuators on every port.
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character.
491902
579874
N***e
Japan
Verified
Purchase
5 .0
2024-03-26
Installed on a campus to town link, 34km of single mode with two patch panels. Receive power around -17dBm, which leaves decent headroom for splice loss.
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character.
491902
579876
E***s
Belgium
Verified
Purchase
5 .0
2024-01-16
Good value for a 40km SFP. We pair it with a 5dB attenuator on short 8km runs because the receiver is sensitive, which is normal for this class of optic.
United Kingdom · English · GBP
