# Fiber optic transceiver BlueOptics BO25K859S2D 40000 Mbit/s QSFP 850 nm

**URL:** https://aio.lv/en/product--efb-elektronik-bo25k859s2d--4472254
**Data updated:** 2026-02-25 16:36 (EET)
**Category:** Network Media Converters
**Manufacturer:** EFB Elektronik
**Manufacturer code:** BO25K859S2D
**EAN:** 4063232650715
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 93.49 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 77.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--efb-elektronik-bo25k859s2d--4472254

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 28.07.2026 | free |
| Pickup points | 31.07.2026 | 1.89 EUR |
| Courier delivery to door | 31.07.2026 | 4.99 EUR |

## Summary description

The BlueOptics BO25K859S2D is a fiber optic transceiver module designed for high-speed data transfer at 40000 Mbit/s. It features a QSFP interface and operates at a wavelength of 850 nm, making it suitable for various networking applications. This module is ideal for enhancing network performance and ensuring reliable data transmission.

## Long description

The BlueOptics BO25K859S2D is a fiber optic transceiver module engineered for 40 Gigabit Ethernet environments. With a QSFP form factor and an operating wavelength of 850 nm, this module supports a maximum data transfer rate of 40000 Mbit/s and is specified for multimode fiber links up to 150 m using MTP/MPO fiber connectors. It is designed to integrate with compatible switches, routers and media converters where high-throughput short-reach links are required.
Advantages
The BlueOptics BO25K859S2D offers reliable short-range 40 Gb/s connectivity in a compact QSFP package. Its 850 nm laser and MTP/MPO connector support standard multimode fiber infrastructures, enabling straightforward deployment in data center aggregation and switch-to-switch links. The module's specification for 150 m reach on multimode fiber provides flexibility for rack-to-rack and row-level interconnects while maintaining uniform signal quality suitable for high-density networking environments.
Suitable for
 Data center top-of-rack and spine-leaf interconnects
 High-speed switch-to-switch links within server rooms
 Short-reach multimode fiber installations up to 150 m
 Network upgrades requiring 40 Gigabit Ethernet ports
Key specifications
 Maximum data transfer rate: 40000 Mbit/s (40 Gb/s)
 Optical wavelength: 850 nm
 Interface type: QSFP for 40 Gigabit Ethernet
 Connector type: MTP/MPO multimode fiber connector
 Maximum transfer distance on multimode fiber: 150 m
How to use
Install the QSFP transceiver into a compatible QSFP port on the network device, ensuring the module seats fully and the device detects the transceiver. Connect an MTP/MPO multimode fiber cable between devices, observing correct polarity and bend-radius limits for the fiber. After physical installation, verify link status and speed on the network device management interface and perform any required link diagnostics or firmware checks according to the host device documentation.
Usage recommendations
Use multimode fiber (OM3/OM4) cables rated for 40 Gb/s links and keep cable runs within the 150 m specification. Ensure port compatibility and check host device transceiver support lists before purchase. Maintain clean connector end-faces and follow ESD handling practices when installing the module.

## Specifications

| Feature | Value |
|---|---|
| Interface type | QSFP |
| Ethernet LAN | Yes |
| Number of products included | 1 pc(s) |
| SFP transceiver type | Fiber optic |
| Multi-mode fiber (MMF) supported | Yes |
| SFP transceiver standard | SR4 |

### Network

| Feature | Value |
|---|---|
| Ethernet interface type | 40 Gigabit Ethernet |
| Maximum data transfer rate | 40000 Mbit/s |
| Fiber ethernet cabling technology | 40GBASE |
| Duplex system | Full |

### Ports & interfaces

| Feature | Value |
|---|---|
| Fiber optic connector | MTP/MPO |

### Performance

| Feature | Value |
|---|---|
| Maximum transfer distance | 150 m |
| Wavelength | 850 nm |
| Rx wavelength (max) | 850 nm |
| Tx wavelength (max) | 850 nm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | 0 - 70 |

### Features

| Feature | Value |
|---|---|
| Digital Diagnostics Monitoring (DDM) | Yes |

## FAQ

### How much does the Fiber optic transceiver BlueOptics BO25K859S2D cost, and is it available for purchase?

The price is 93.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 451 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 28.07.2026 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. 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 EFB Elektronik 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 EFB Elektronik 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, 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.

## Image

https://aio.lv/img/cache/product/4472254/54606898_large.webp