# SFP Module TP-Link TL-SM321A 1000Base-BX WDM 1250 Mbit/s

**URL:** https://aio.lv/en/product--tp-link-tl-sm321a--8199
**Data updated:** 2025-12-28 21:00 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** TP-LINK
**Manufacturer code:** TL-SM321A
**Warranty:** 5 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-09 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tp-link-tl-sm321a--8199

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 19.06.2026 | free |
| Pickup points | 26.06.2026 | 1.99 EUR |
| Courier delivery to door | 26.06.2026 | 4.99 EUR |

## Summary description

The TP-Link TL-SM321A is a 1000Base-BX WDM Bi-Directional SFP module designed for high-speed fiber optic connections. It supports a maximum data transfer rate of 1250 Mbit/s and operates at an input voltage of 3.3 V. With a compact metallic design, it measures 55.4 mm in width, 12.9 mm in depth, and height. Certified by FCC and CE, this module ensures reliable performance for networking applications.

## Long description

The TP-Link TL-SM321A is a 1000Base-BX WDM bi-directional SFP module for fiber-optic network links. It transmits and receives on different wavelengths over a single strand of fiber, supports up to 1250 Mbit/s data rate and uses an internal +3.3 V power supply. The compact metallic module is compatible with a range of TP‑LINK devices and extends network distance up to 10 km when paired with a matching module.
Advantages
The module uses WDM bi-directional technology to carry two opposite data streams over one fiber strand, reducing cabling costs and simplifying installation. It provides separate TX and RX wavelengths (TX 1550 nm, RX 1310 nm), offers plug-and-play operation and meets FCC and CE certification for reliable interoperability with compatible switches, routers and media converters.
Suitable for
Extending Ethernet links up to 10 km over single-strand fiber
Connections between switches, routers and media converters supporting SFP 1000Base-BX
Environments where minimizing fiber cabling is important
Key specifications
Model: TP-Link TL-SM321A
Standard: 1000Base-BX (WDM Bi-Directional)
Interface type: SFP
Maximum data transfer rate: 1250 Mbit/s
TX wavelength: 1550 nm; RX wavelength: 1310 nm
Power supply: internal +3.3 V
Colour: Metallic
Typical range: up to 10 km (depends on link conditions)
Certifications: FCC, CE
How to use
Insert the TL-SM321A module into an SFP port on a compatible TP‑LINK switch, router or media converter and pair it with the complementary TL-SM321B module at the remote end. Connect a single-mode fiber cable between the two modules, verifying correct orientation of transmit and receive ends. Power on the devices; the module is plug-and-play and should negotiate link speed automatically. Ensure devices at both ends support 1000Base-BX operation.
Usage recommendations
Use the TL-SM321A in matched pairs (A with B) and with certified single-mode fiber for best performance. Verify device compatibility and port settings before deployment and observe ESD precautions when handling the SFP module.

## Specifications

### Performance

| Feature | Value |
|---|---|
| Interface type | SFP |
| Maximum data transfer rate | 1250 Mbit/s |
| Networking standards | IEEE 802.3z |
| Fiber optic connector | LC (UPC) |
| Maximum transfer distance | 10000 m |
| Fiber cable diameters supported (core/cladding) | 9/125 |
| Rx wavelength (max) | 1310 nm |
| Tx wavelength (max) | 1550 nm |
| Single-mode fiber (SMF) supported | Yes |

### Network

| Feature | Value |
|---|---|
| SFP transceiver type | Fiber optic |

### Features

| Feature | Value |
|---|---|
| Plug and Play | Yes |
| Product colour | Metallic |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 10 - 90 |
| Storage temperature (T-T) | -40 - 80 |
| Operating temperature (T-T) | 0 - 70 |
| Storage relative humidity (H-H) | 5 - 90 |

### Power

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

### Certificates

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

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 60 g |
| Package depth | 122.5 mm |
| Package height | 38.5 mm |
| Package width | 81.5 mm |
| Number of products included | 1 pc(s) |

### Weight & dimensions

| Feature | Value |
|---|---|
| Height | 12.9 mm |
| Width | 55.4 mm |
| Depth | 12.9 mm |

## FAQ

### How much does the SFP Module TP-Link TL-SM321A 1000Base-BX cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 84 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 19.06.2026 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: interface type, maximum data transfer rate, 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 SFP Module TP-Link TL-SM321A 1000Base-BX?

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/8199/54578258_large.webp