# SFP optical module MaxLink ML-S5531-20 WDM BiDi 1550nm 20km

**URL:** https://aio.lv/en/product--maxlink-ml-s5531-20--6236384
**Data updated:** 2026-02-12 14:20 (EET)
**Category:** Network Media Converters
**Manufacturer:** MaxLink
**Manufacturer code:** ML-S5531-20
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 11.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 9.91 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--maxlink-ml-s5531-20--6236384

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.06.2026 | free |
| Pickup points | 03.07.2026 | 1.99 EUR |
| Courier delivery to door | 03.07.2026 | 4.99 EUR |

## Summary description

Compact SFP optical module MaxLink ML-S5531-20 supporting WDM BiDi transmission at 1550 nm with a reach of up to 20 km. Designed for insertion in compatible SFP ports, it enables single-fiber bidirectional optical links for network equipment, media converters and switches. Suitable for fiber network extension, point-to-point links and upgrading infrastructure while preserving fiber infrastructure.

## Long description

The MaxLink ML-S5531-20 is a compact SFP optical module that supports WDM BiDi transmission at 1550 nm with a reach of up to 20 km. Designed for insertion into compatible SFP ports on media converters, switches and other network equipment, this module provides single-fiber bidirectional links that help extend existing fiber infrastructure without adding parallel fibers. The small form factor and standard SFP interface make it suitable for upgrades and replacements in active equipment that accepts SFP transceivers.
Advantages
The module enables bidirectional communication over a single optical fiber using WDM BiDi technology at 1550 nm, reducing fiber cabling requirements. Its compact SFP form factor ensures compatibility with a wide range of devices that support standard SFP transceivers. With a specified reach of up to 20 km, it supports medium-distance links for campus, access and point-to-point applications while preserving existing fiber routes.
Suitable for
 Extending fiber networks and upgrading links without laying new fibers
 Point-to-point single-fiber connections between switches and media converters
 Deployments that require WDM BiDi operation at 1550 nm
 Replacing or adding SFP transceivers in compatible network equipment
Key specifications
 Optical wavelength: 1550 nm
 Connector type: SFP form factor for standard SFP ports
 Transmission mode: WDM BiDi (bidirectional on a single fiber)
 Maximum link distance: up to 20 km
 Typical application: single-fiber point-to-point links, fiber extension
How to use
Insert the ML-S5531-20 module into a compatible SFP slot on network equipment, ensuring the host device supports WDM BiDi transceivers at 1550 nm. Connect the single-mode fiber to the module's optical port using the appropriate connector type for your equipment. Verify link status and configure the host device as required; the transceiver operates transparently as an SFP module and typically requires no additional software installation. Observe ESD precautions and ensure physical alignment of fiber connectors to maintain signal quality.
Usage recommendations
Use single-mode fiber with proper attenuation and connector cleanliness for reliable operation up to 20 km. Confirm compatibility with the host device's SFP specifications and support for WDM BiDi at 1550 nm before installation. Keep operating environments within the equipment's specified temperature and humidity ranges and inspect connectors regularly to avoid signal loss.

## FAQ

### How much does the SFP module MaxLink ML-S5531-20 1550nm 20km cost, and is it available for purchase?

The price is 11.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 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 30.06.2026 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 MaxLink 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 MaxLink 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

## Image

https://aio.lv/img/cache/product/6236384/51557197_large.webp