# Network QSFP+ Transceiver BlueOptics BO25K859S2D 40GBASE-SR4 Multimode Fiber

**URL:** https://aio.lv/en/product--blueoptics-qsfp40g-bo--10617608
**Data updated:** 2026-02-25 16:38 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** BlueOptics
**Manufacturer code:** QSFP+40G-BO
**EAN:** 4063232308326
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 93.49 €
**Prices and availability valid until:** 2026-08-04 23:59
**Price without VAT (21%):** 77.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-qsfp40g-bo--10617608

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.08.2026 | free |
| Pickup points | 06.08.2026 | 1.89 EUR |
| Courier delivery to door | 06.08.2026 | 4.99 EUR |

## Summary description

BlueOptics BO25K859S2D is a QSFP+ 40GBASE-SR4 multimode fiber transceiver designed for short-reach 40 Gbps links. It supports QSFP+ form factor and multimode OM3/OM4 fiber (compatible with SR4 optics), enabling high-density aggregation and data center interconnects. Use for server uplinks, switches and switch-to-switch connections where reliable 40 Gbps multimode transmission is required.

## Long description

BlueOptics BO25K859S2D is a QSFP+ 40GBASE-SR4 multimode fiber transceiver designed for short-reach 40 Gbps links in data centers and high-density network environments. The module uses the QSFP+ form factor and is compatible with OM3 and OM4 multimode fiber, delivering four parallel 10 Gbps lanes for aggregate 40 Gbps connectivity. It is intended for server uplinks, switch-to-switch connections and aggregation links where reliable multimode transmission and compact, hot-pluggable installation are required.
Advantages
The transceiver offers compact QSFP+ packaging that maximizes port density while supporting 40 Gbps multimode transmission over short distances. Compatibility with OM3 and OM4 multimode fiber enables flexible deployment in existing multimode cabling plants. Hot-pluggable design simplifies installation and replacement without downtime for powered equipment. The module’s parallel-lane approach ensures efficient use of fiber infrastructure and predictable performance for bursty or sustained 40 Gbps traffic.
Suitable for
 Data center uplinks between servers and top-of-rack switches
 Switch-to-switch aggregation and spine-leaf interconnects
 Short-reach backbone links within campus or enterprise buildings
 High-density switch ports where space and port count are critical
Key specifications
 Form factor: QSFP+
 Data rate: 40 Gbps aggregate (4×10 Gbps lanes)
 Optical mode: Multimode fiber (OM3 / OM4 compatible)
 Standard: 40GBASE-SR4
 Reach: short-reach multimode links (dependent on fiber grade and link loss)
 Interface: MPO/MTP parallel fiber connector (4-lane parallel optics)
 Hot-pluggable QSFP+ module for easy installation
How to use
Install the QSFP+ transceiver into the QSFP+ port of a compatible switch, router or network interface card following the equipment manufacturer’s insertion instructions. Connect an MPO/MTP multimode trunk cable terminated for SR4 parallel optics to the module and route fiber to the corresponding SR4 module or breakout cassette on the far end. Ensure fiber grade (OM3 or OM4) and patching meet required link loss and distance expectations. After insertion, verify link status and adjust switch interface settings as needed for 40G operation.
Usage recommendations
Use OM3 for typical short-reach deployments and OM4 for extended short-reach distances or where future higher-margin performance is desired. Maintain clean MPO/MTP connectors and follow vendor guidance for fiber polishing and cleaning to ensure optimal signal quality. Confirm compatibility with the host equipment and perform link validation after installation.

## FAQ

### How much does the QSFP+ Transceiver BlueOptics BO25K859S2D 40GBASE-SR4 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 — 445 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 03.08.2026 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 BlueOptics 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 BlueOptics 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/10617608/66006631_large.webp