# SFP Fiber Optic Transceiver TP-LINK ISM311LM — 1.25 Mbit/s, 850 nm, LC, 550 m, grey

**URL:** https://aio.lv/en/product--tp-link-ism311lm--11546746
**Data updated:** 2026-03-08 08:37 (EET)
**Category:** Network Media Converters
**Manufacturer:** TP-LINK
**Manufacturer code:** ISM311LM
**EAN:** 1210002601979
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 21.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tp-link-ism311lm--11546746

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 01.07.2026 | free |
| Pickup points | 06.07.2026 | 1.99 EUR |
| Courier delivery to door | 06.07.2026 | 4.99 EUR |

## Summary description

TP-LINK ISM311LM is an SFP fiber-optic transceiver module for short-range Ethernet links. It supports up to 1.25 Mbit/s data rate at 850 nm wavelength, LC (UPC) connector and a reach of up to 550 m. The module uses a 3.3 V input, has 1.25 Gigabit Ethernet interface compatibility, grey housing and FCC/CE certification, suitable for switch and router uplinks.

## Long description

TP-LINK ISM311LM is an SFP fiber optic transceiver module designed for short-range Ethernet links. It supports a data rate up to 1.25 Mbit/s over multimode fiber at an 850 nm wavelength, uses an LC (UPC) connector and provides a reach of up to 550 m. The module is intended for use in switches and routers to extend uplink distances, features a grey housing and operates from a 3.3 V input. It is compatible with 1.25 Gigabit Ethernet interfaces and carries FCC/CE compliance for network deployments.
Advantages
The module offers hot-pluggable installation for quick replacement or upgrade without powering down equipment. Its compliance with SFP-MSA ensures interoperability with a broad range of SFP-capable devices. The ISM311LM supports Digital Diagnostic Monitoring (DDM) to monitor optical parameters and link status. Its industrial operating temperature range extends applicability to harsher environments where extended temperature tolerance is required.
Suitable for
 Uplinks between switches and routers within short-range multimode fiber networks
 Industrial network segments requiring extended temperature tolerance
 Network equipment deployments where hot-swappable optics reduce downtime
 Cost-conscious installations that choose fiber modules as needed to extend reach
Key specifications
 Maximum data transfer rate: 1.25 Mbit/s
 Maximum transfer distance: up to 550 m (multimode fiber)
 Wavelength: 850 nm
 Connector type: LC (UPC)
 Ethernet interface compatibility: 1.25 Gigabit Ethernet
 Input voltage: 3.3 V
 Form factor: SFP (hot-pluggable)
 Product colour: Grey
 Operating temperature range (industrial): -40 to 85°C
 Supports Digital Diagnostic Monitoring (DDM)
How to use
Power off the host device if recommended by the device manufacturer, insert the ISM311LM module into an SFP slot until it latches securely, and connect LC fiber patch cables to the module. After insertion, verify link status on the host switch or router and confirm optical parameters via DDM if supported by the management interface. To remove, disengage the latch and pull the module straight out; protect transceiver ports and fiber ends with dust caps when not connected.
Usage recommendations
Use single-mode/multimode fiber consistent with the module specification and ensure LC patch cables are clean before mating. For reliable operation, match transceiver wavelength and fiber type at both ends of the link, monitor DDM readings for signal health, and follow your equipment manufacturer’s compatibility list to avoid interoperability issues.

## Specifications

| Feature | Value |
|---|---|
| Interface type | SFP |
| Maximum operating temperature | 85 °C |
| SFP transceiver type | Fiber optic |
| Minimum operating temperature | -40 °C |
| Multi-mode fiber (MMF) supported | Yes |

### Network

| Feature | Value |
|---|---|
| Ethernet interface type | 1.25 Gigabit Ethernet |
| Maximum data transfer rate | 1.25 Mbit/s |
| Networking standards | IEEE 802.3z |

### Ports & interfaces

| Feature | Value |
|---|---|
| Fiber optic connector | LC (UPC) |

### Performance

| Feature | Value |
|---|---|
| Maximum transfer distance | 550 m |
| Wavelength | 850 nm |
| Fiber cable diameters supported (core/cladding) | 50/125, 62.5/125 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Height | 11 mm |
| Width | 56.4 mm |
| Depth | 13.4 mm |

### Power

| Feature | Value |
|---|---|
| Input voltage | 3.3 |

### Certificates

| Feature | Value |
|---|---|
| Certification | FCC, CE |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 5 - 85 |
| Storage temperature (T-T) | -40 - 85 |
| Storage relative humidity (H-H) | 5 - 85 |

### Features

| Feature | Value |
|---|---|
| Product colour | Grey |
| Hot-swap | Yes |

### Logistics data

| Feature | Value |
|---|---|
| Quantity per pack | 1 pc(s) |

## FAQ

### How much does the TP-LINK ISM311LM SFP Fiber Transceiver cost, and is it available for purchase?

The price is 25.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 21 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 01.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All TP-LINK products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized TP-LINK service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: maximum data transfer rate, maximum transfer distance, ethernet interface type, fiber optic connector, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for TP-LINK ISM311LM SFP Fiber Transceiver?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/11546746/67346304_large.webp