# SFP optical module MaxLink ML-S5531-20-HPE, 1.25G BiDi WDM, SM, Tx1550/Rx1310nm, 20km, LC, DDM

**URL:** https://aio.lv/en/product--maxlink-ml-s5531-20-hpe--12400238
**Data updated:** 2026-04-28 17:45 (EEST)
**Category:** Network Media Converters
**Manufacturer:** MaxLink
**Manufacturer code:** ML-S5531-20-HPE
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.49 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 10.32 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--maxlink-ml-s5531-20-hpe--12400238

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

MaxLink ML-S5531-20-HPE is a 1.25G SFP optical transceiver for single‑mode (SM) BiDi WDM links with Tx at 1550 nm and Rx at 1310 nm. Designed for up to 20 km transmission over single‑fiber using an LC connector, it supports DDM for real‑time diagnostics and interoperates with HPE equipment and compatible SFP ports.

## Long description

MaxLink ML-S5531-20-HPE is a 1.25G SFP optical transceiver for single-mode BiDi WDM links. It transmits at 1550 nm and receives at 1310 nm over a single fibre, supports a link distance of up to 20 km and uses a single LC connector. The module provides DDM (digital diagnostics) and is fully compatible with HPE Aruba Networking AOS-S and AOS-CX switches and other HPE-compatible SFP ports.
Advantages
The module enables single-fibre bidirectional transmission which reduces cabling and fibre usage for long-distance links. Built-in DDM allows real-time monitoring of optical parameters such as output power and received signal, helping with diagnostics and maintenance. The LC connector with UPC polishing ensures low connection loss, and the transceiver is designed for interoperability with HPE equipment to simplify deployment in mixed environments.
Suitable for
Single-mode fibre links requiring up to 20 km reach
Networks where single-fibre BiDi WDM reduces cabling complexity
Upgrading or expanding HPE Aruba Networking switches and compatible SFP ports
Point-to-point connections between buildings or network segments
When it may not be suitable
This SFP is designed for single-mode fibre and is not suitable for multimode fibre networks. It uses BiDi WDM with fixed Tx/Rx wavelengths (Tx 1550 nm / Rx 1310 nm), so it is not appropriate where specific wavelength matching or conventional dual-fibre transceivers are required. For distances beyond 20 km or different data-rate requirements, a different module should be selected.
Key specifications
Form factor: SFP
Fibre type: Single-mode
Data rate: 1.25 Gbps (Tx/Rx)
Wavelength Tx/Rx: 1550 nm / 1310 nm
Maximum range: 20 km
Transmission type: WDM (BiDi)
Connector type: 1 × LC (UPC)
Transmit power: -9 to -3 dBm
Receiver sensitivity: -23 dBm
Operating temperature: 0 to 70 °C
DDM/Diagnostics: Supported
How to use
Install the SFP module into a compatible SFP slot on the switch or media converter with the LC connector facing the fibre patch cable. Connect a single-mode LC patch cable matching the BiDi wavelengths to the module. Verify link status in the switch management interface and use DDM to monitor optical parameters for correct operation and troubleshooting. Ensure firmware or compatibility settings on HPE devices allow third-party SFP modules if applicable.
What to consider before purchase
Confirm your equipment supports single-fibre BiDi WDM transceivers and HPE compatibility requirements
Ensure the Tx/Rx wavelength orientation (Tx 1550 / Rx 1310) matches the remote transceiver
Check required link distance does not exceed 20 km
Verify operating temperature range suits the installation environment
Usage recommendations
Use high-quality single-mode LC patch cables with UPC polishing and verify DDM readings after installation. When replacing existing modules, match the BiDi wavelength orientation at both ends to avoid link failure.

## FAQ

### How much does the MaxLink ML-S5531-20-HPE 1.25G SFP BiDi WDM module cost, and is it available for purchase?

The price is 12.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 09.07.2026 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 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

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