TP-Link TL-SM311LM Gigabit Multi-Mode SFP Module Price in Kenya

The TP-Link TL-SM311LM is a 1000BASE-SX multimode SFP transceiver designed to provide Gigabit Ethernet connectivity over multimode fibre.

It operates at a wavelength of 850nm, supports a data rate of 1.25Gbps, and uses an LC/UPC optical interface. Depending on the installed multimode fibre, TP-Link specifies a maximum reach of up to 550 metres on 50/125µm fibre and up to 275 metres on 62.5/125µm fibre for earlier TL-SM311LM versions. 

Newer SM311LM versions also support Digital Diagnostic Monitoring (DDM), SFP-MSA compatibility and hot-swappable operation, making the module suitable for managed switches, smart switches and compatible media converters. 

TP-Link TL-SM311LM Specifications

TP-Link's current datasheet confirms 850nm operation, 1.25Gbps data rate, LC duplex connectivity, DDM, SFP-MSA support, hot-swappable design and up to 550m multimode transmission. 

What Is the TP-Link TL-SM311LM?

The TL-SM311LM is a small fibre optic transceiver that plugs into a compatible SFP slot.

It allows networking equipment to communicate through multimode fibre instead of copper Ethernet.

A typical connection is:

TP-Link Switch → TL-SM311LM → Duplex Multimode Fibre → TL-SM311LM → Remote Switch

This makes the module ideal for connecting switches between:

• Buildings

• Server rooms

• Network cabinets

• Offices

• CCTV control rooms

• Campus facilities

• Data rooms

1000BASE-SX SFP Module

The TL-SM311LM is designed for 1000BASE-SX Gigabit Ethernet.

SX commonly refers to short-wavelength optical transmission over multimode fibre.

The module operates at:

850nm

and provides a Gigabit Ethernet optical interface.

1.25Gbps Data Rate

The TL-SM311LM has an optical data rate of:

1.25Gbps

This supports standard 1 Gigabit Ethernet communication.

TP-Link lists the module's data rate as 1.25Gbps.

850nm Wavelength

The module uses an optical wavelength of:

850nm

This wavelength is commonly used for short-distance Ethernet transmission over multimode fibre.

Because it is a multimode SFP, it should not be treated as a long-distance 1310nm single-mode module.

Multimode Fibre Support

The TL-SM311LM supports multimode fibre including:

50/125µm

and

62.5/125µm

TP-Link specifies both fibre types in its product documentation. 

Maximum Transmission Distance

The maximum transmission distance depends on the fibre type and quality.

TP-Link's earlier TL-SM311LM documentation specifies:

Current TP-Link documentation generally lists the module for distances of up to 550m. 

LC/UPC Duplex Connector

The TL-SM311LM uses an:

LC/UPC optical interface

For a standard installation, a duplex multimode LC patch cord is required.

One fibre strand carries Tx traffic while the second carries Rx traffic.

Typical connection:

LC Tx → Fibre Core 1

LC Rx ← Fibre Core 2

Duplex Fibre Operation

Unlike BiDi modules, the TL-SM311LM normally requires two fibre strands.

This means the correct patch cord is usually:

LC-LC Duplex Multimode Patch Cord

depending on the termination at the other end.

Digital Diagnostic Monitoring – DDM

Current SM311LM versions support:

DDM – Digital Diagnostic Monitoring

DDM can allow compatible networking equipment to monitor operational information from the SFP.

This can help technicians inspect parameters such as:

• Optical transmit conditions

• Optical receive conditions

• Module temperature

• Operating voltage

• Diagnostic status

TP-Link specifically lists DDM support on current SM311LM models. 

SFP-MSA Compatibility

The SM311LM is compatible with the Small Form-factor Pluggable Multi-Source Agreement, commonly referred to as SFP-MSA. 

This standardized form factor improves interoperability, although device-specific compatibility should still be checked before installation.

Hot-Swappable Design

The module is hot-swappable, meaning it is designed so that a compatible SFP can be inserted or removed without replacing the entire networking device. 

This makes installation and maintenance easier in enterprise and ISP networks.

Watch TP-Link TL-SM311LM Video

https://youtu.be/pHTFNOi3jvA

The TP-Link TL-SM311LM provides a simple way to add Gigabit multimode fibre connectivity to compatible network switches and media converters. Its compact SFP form factor allows technicians to install the required optical interface without replacing the entire networking device.

Because the module uses 850nm multimode optics, it is particularly suitable for relatively short fibre runs within buildings, compounds, server facilities and campuses. For substantially longer links, a single-mode SFP such as a 1310nm 10km or 20km module would normally be more appropriate.

The combination of 1.25Gbps performance, LC/UPC connectivity, DDM and hot-swappable operation makes the SM311LM practical for enterprise LANs, CCTV networks, switch uplinks and fibre-connected equipment rooms. 

TP-Link TL-SM311LM for TP-Link Switches

TP-Link designed the TL-SM311LM for use with compatible TP-Link switching products.

The manufacturer specifically identifies compatibility with a range of TP-Link managed and smart switches. 

It can be useful for:

• Switch-to-switch uplinks

• Distribution networks

• Fibre aggregation

• Building links

• Network cabinet connections

TP-Link TL-SM311LM with JetStream Switches

Earlier TP-Link product documentation specifically states compatibility with TP-Link JetStream switches that provide suitable SFP ports. 

The exact switch model and SFP port requirements should still be verified.

TP-Link TL-SM311LM with MC220L

TP-Link identifies the module as compatible with the:

TP-Link MC220L

media converter. 

The MC220L can provide an Ethernet-to-SFP conversion interface where a normal copper Ethernet device needs to connect to fibre.

Using TL-SM311LM with a Media Converter

A common setup is:

Ethernet Device
↓
MC220L Media Converter
↓
TL-SM311LM
↓
Multimode Fibre
↓
TL-SM311LM
↓
Remote SFP Device

This is useful when connecting equipment that does not already contain built-in SFP ports.

TP-Link TL-SM311LM for Building-to-Building Fibre

Copper Ethernet is limited to relatively short distances.

Multimode fibre allows two nearby buildings to be interconnected while providing:

• Electrical isolation

• Resistance to electromagnetic interference

• Gigabit bandwidth

• Longer distance than standard copper Ethernet

• Easier campus expansion

The TL-SM311LM's maximum 550m rating makes it suitable for many campus and compound networks. 

TP-Link TL-SM311LM for CCTV Networks

The TL-SM311LM can be used for fibre uplinks between CCTV switches.

Example:

IP Cameras → PoE Switch → TL-SM311LM → Multimode Fibre → TL-SM311LM → Core Switch/NVR

This can be useful in:

• Schools

• Offices

• Warehouses

• Factories

• Shopping centres

• Hospitals

• Hotels

• Estates

TP-Link TL-SM311LM for Campus Networks

The module is suitable for linking network equipment across a campus where the distance remains within the multimode optical specification.

Applications include:

• Universities

• Schools

• Hospitals

• Industrial compounds

• Government facilities

• Office parks

TP-Link TL-SM311LM for Data Rooms

Within larger buildings, the module can connect:

Main Distribution Frame → Intermediate Distribution Frame

or:

Core Switch → Floor Distribution Switch

over multimode fibre.

TP-Link TL-SM311LM vs Single-Mode SFP

TP-Link TL-SM311LM vs TL-SM311LS

The TL-SM311LM and TL-SM311LS serve different fibre requirements.

Choose the module according to the installed fibre.

Multimode vs Single-Mode Fibre

50/125µm vs 62.5/125µm Multimode Fibre

The TL-SM311LM supports both fibre sizes.

However, TP-Link's earlier documentation specifies different maximum distances:

50/125µm → Up to 550m

62.5/125µm → Up to 275m. 

This makes fibre identification important before deploying the module.

Can TL-SM311LM Work with OM2 Fibre?

50/125µm multimode fibres are commonly used in modern structured fibre networks.

Compatibility and maximum distance should be checked according to the exact OM fibre category, cable condition and network standard.

Can TL-SM311LM Work with OM3 Fibre?

Yes, when the installed fibre and connectors are compatible with the module's 850nm multimode optical interface.

However, the module itself remains 1 Gigabit, even if OM3 fibre is capable of much higher data rates when paired with suitable transceivers.

Can TL-SM311LM Work with OM4 Fibre?

The optical interface can be used on compatible multimode fibre, but installing OM4 does not turn the module into a 10G transceiver.

Its Ethernet speed remains 1Gbps.

TL-SM311LM vs 10G SFP+

Operating Temperature

TP-Link specifies a commercial operating temperature range of:

0°C to 70°C

for current SM311LM models. 

The specified storage temperature is approximately:

-40°C to 80°C

on several product versions.

TP-Link TL-SM311LM Dimensions

TP-Link specifies dimensions of approximately:

55.4 × 13.7 × 12.9mm

or:

2.2 × 0.5 × 0.5 inches. 

TP-Link TL-SM311LM Price in Kenya

The price of the TP-Link TL-SM311LM Gigabit Multi-Mode SFP Module in Kenya varies according to supplier, hardware revision, warranty and stock availability.

Rather than treating third-party prices as fixed, customers should request the current quote before ordering.

Contact Fiber Optics Kenya for the current TP-Link TL-SM311LM price in Kenya.

What Affects TL-SM311LM Price?

The selling price can vary according to:

• TP-Link hardware revision

• Distributor

• Stock availability

• Warranty

• Import cost

• Quantity

• VAT status

• Bulk ordering

How to Choose the Correct SFP Module

Before purchasing the TL-SM311LM, confirm:

1. Your network requires 1 Gigabit Ethernet.

2. The installed fibre is multimode.

3. The fibre route is within the supported optical reach.

4. Your equipment has a compatible SFP port.

5. Your patch cord uses LC connectors.

6. You have two fibre strands available for duplex operation.

7. The SFP compatibility requirements of the switch are satisfied.

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Frequently Asked Questions About TP-Link TL-SM311LM

What is the TP-Link TL-SM311LM?

It is a Gigabit Ethernet multimode SFP transceiver.

Is TL-SM311LM a 1G module?

Yes.

What is its data rate?

TP-Link specifies 1.25Gbps. 

What Ethernet standard does it use?

1000BASE-SX.

What wavelength does it use?

850nm. 

Is TL-SM311LM single mode?

No. It is a multimode module.

What fibre does it support?

50/125µm and 62.5/125µm multimode fibre. 

What is the maximum distance?

Up to approximately 550 metres, depending on fibre type. 

How far can it work over 50/125µm fibre?

TP-Link specifies up to 550m. 

How far can it work over 62.5/125µm fibre?

Earlier TL-SM311LM documentation specifies up to 275m. 

What connector does it use?

LC/UPC. 

Is it LC duplex?

Yes, current TP-Link documentation identifies it as an LC duplex module. 

How many fibre cores are needed?

Normally two fibres for Tx and Rx.

Is TL-SM311LM BiDi?

No. It is a conventional duplex multimode transceiver.

Does it support DDM?

Current SM311LM versions do. 

What does DDM mean?

Digital Diagnostic Monitoring.

Is the module hot-swappable?

Yes. 

Is it SFP-MSA compatible?

Yes. 

What voltage does it use?

3.3V. 

Can it work with TP-Link switches?

Yes, with compatible TP-Link SFP ports.

Can it work with JetStream switches?

TP-Link lists compatibility with suitable JetStream switches. 

Can it work with TP-Link MC220L?

Yes. TP-Link specifically identifies MC220L compatibility.

Can I use it with a media converter?

Yes, provided the converter supports compatible SFP modules.

Can it connect two switches?

Yes.

Can it connect two buildings?

Yes, if the fibre distance remains within specification.

Is it suitable for CCTV?

Yes.

Is it suitable for enterprise networks?

Yes.

Is it suitable for campus networks?

Yes.

Can it be used in a data centre?

Yes, particularly for legacy or 1G multimode connections.

Can I use it for 10Gbps?

No. It is a 1Gbps Ethernet module.

Can it work in an SFP+ slot?

Possibly on equipment that supports 1G SFP operation in that SFP+ cage, but this must be checked with the switch manufacturer.

Is 850nm used with single-mode fibre?

This module is designed for multimode fibre.

Can I use it on single-mode fibre?

It is not designed as a standard single-mode SFP. Use a suitable single-mode transceiver instead.

Is the TL-SM311LM good for 10km links?

No. Its intended maximum reach is up to about 550m.

Which module should I use for longer fibre links?

Use an appropriate single-mode SFP rated for the required distance, such as 10km, 20km, 40km or another suitable reach.

Does OM3 make the SFP 10G?

No. The module remains 1G.

Can it use LC-LC patch cords?

Yes.

Can it use LC-SC patch cords?

Yes, where the remote termination is SC and the fibre type is compatible.

Should I use simplex or duplex patch cord?

Duplex.

Can dirty connectors affect the link?

Yes. Dirt can increase optical loss and cause unreliable connectivity.

Should I clean LC connectors before connecting them?

Yes.

Can an Optical Power Meter test this link?

Yes.

Can an OTDR test the multimode fibre?

Yes, provided an appropriate multimode-capable OTDR and test configuration are used.

What operating temperature does it support?

Current TP-Link specifications state 0°C to 70°C. 

What are the dimensions?

Approximately 55.4 × 13.7 × 12.9mm.

Is this an original TP-Link product?

TL-SM311LM is an official TP-Link/Omada transceiver model. TP-Link currently lists the newer SM311LM versions under its Omada business networking range. 

Is TL-SM311LM discontinued?

TP-Link marks some older TL-SM311LM hardware versions as End of Life, while newer SM311LM versions remain listed by TP-Link. 

What is the TP-Link TL-SM311LM price in Kenya?

Pricing varies with the hardware revision, supplier, stock and warranty. Contact Fiber Optics Kenya for the current price.

Do you supply TL-SM311LM modules?

Yes, subject to stock availability.

Do you supply single-mode SFPs?

Yes.

Do you supply 10G SFP+ modules?

Yes.

Do you supply fibre patch cords?

Yes.

Do you supply TP-Link media converters?

Yes, subject to availability.

Can businesses and ISPs order in bulk?

Yes. Bulk orders are suitable for enterprise networks, ISPs, CCTV installers and networking contractors.

Do you deliver outside Nairobi?

Yes. Fiber Optics Kenya supplies fibre optic and networking equipment throughout Kenya.

Why Buy TP-Link TL-SM311LM from Fiber Optics Kenya?

Contact Fiber Optics Kenya

Fiber Optics Kenya
Lyric House, 7th Floor Room S9
Kimathi Street, Nairobi

Phone: +254 704 991 492
Email: info@fibreopticskenya.co.ke

The TP-Link TL-SM311LM Gigabit Multi-Mode SFP Module is a practical fibre transceiver for short-to-medium-distance Gigabit Ethernet links. It operates at 850nm, supports a 1.25Gbps optical data rate, uses LC/UPC multimode connectivity, and supports distances up to approximately 550m on suitable 50/125µm fibre. 

Current SM311LM versions also provide DDM, SFP-MSA compliance and hot-swappable operation, making them suitable for TP-Link managed switches, enterprise networks, CCTV installations, campus fibre links and compatible media converters.

For installations beyond the supported multimode distance, a suitable single-mode SFP should be selected instead.

Contact Fiber Optics Kenya for the current TP-Link TL-SM311LM price in Kenya, multimode and single-mode SFP modules, fibre patch cords, media converters, testing equipment, bulk networking orders and nationwide delivery.