# SFP optical module MaxLink ML-S31D-20 single-mode 1310 nm 20 km

**URL:** https://aio.lv/en/product--maxlink-ml-s31d-20--8579824
**Data updated:** 2026-02-23 13:20 (EET)
**Category:** Network Media Converters
**Manufacturer:** MaxLink
**Manufacturer code:** ML-S31D-20
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 9.99 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 8.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--maxlink-ml-s31d-20--8579824

## 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

SFP optical transceiver MaxLink ML-S31D-20 is a single-mode module operating at 1310 nm with a transmission range up to 20 km. Designed for insertion into SFP ports on switches, routers and media converters, it provides fiber connectivity for long-distance links. Suitable for network uplinks, campus links and telecom applications requiring single-mode fiber and reliable optical transmission.

## Long description

The MaxLink ML-S31D-20 SFP optical module is a single-mode transceiver designed for fiber-optic links that require reliable point-to-point transmission over longer distances. Operating at a wavelength of 1310 nm, this compact SFP module supports a maximum reach of up to 20 km over single-mode fiber. It is intended for insertion into standard SFP ports on switches, routers and media converters to provide a stable optical uplink for campus networks, access rings and telecom interconnects.
Advantages
The module delivers cost-effective single-mode connectivity in a compact SFP form factor suitable for hot-plug installation. Its 1310 nm wavelength balances dispersion and attenuation for mid-range single-mode links, while the 20 km reach covers typical campus and metropolitan segments without the need for intermediate amplification. Compatibility with common SFP sockets enables straightforward integration into existing network equipment and media converters.
Suitable for
 Switch-to-switch uplinks in campus and enterprise networks
 Router and media converter optical interfaces
 Longer access links and telecom aggregation up to 20 km
 Single-mode fiber backbone segments and point-to-point connections
Key specifications
 Form factor: SFP (small form-factor pluggable)
 Fiber type: single-mode fiber (SMF)
 Wavelength: 1310 nm
 Maximum transmission distance: up to 20 km (depending on link budget and fiber quality)
 Interface: optical LC connector
 Typical use: data uplinks, campus links, telecom interconnects
How to use
Ensure both endpoints use single-mode fiber and LC connectors, and verify fiber continuity and connector cleanliness before insertion. Power down or follow hot-plug procedures recommended by your network equipment vendor, then insert the SFP module into an available SFP slot until it seats firmly. Connect the single-mode fiber patch cable to the module's LC port. After insertion, confirm link status via the switch or router management interface and monitor optical levels if available. To remove, follow the equipment’s hot-unplug guidance or power-down procedures and gently extract the module by the housing.
Usage recommendations
Use clean, properly rated single-mode fiber cables and maintain dust caps on the optical connector when the module is not connected. Verify that the host device supports third-party SFP modules if required, and check link parameters such as receive/transmit power to ensure the 20 km reach is achievable with your fiber plant.

## FAQ

### How much does the SFP module MaxLink ML-S31D-20 cost, and is it available for purchase?

The price is 9.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 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/8579824/51557196_large.webp