# Optical QSFP Transceiver BlueOptics BO25K856S2D 40GBASE-SR2-BIDI up to 100 m

**URL:** https://aio.lv/en/product--blueoptics-at-qsfpsr4lc-bo--7752740
**Data updated:** 2026-03-07 15:17 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** BlueOptics
**Manufacturer code:** AT-QSFPSR4LC-BO
**EAN:** 4063232140254
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 793.49 €
**Prices and availability valid until:** 2026-08-04 23:59
**Price without VAT (21%):** 655.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-at-qsfpsr4lc-bo--7752740

## 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

This BlueOptics QSFP transceiver model BO25K856S2D supports 40GBASE-SR2-BIDI operation for short-range multimode fiber links up to 100 meters. It provides high-speed 40 Gbps connectivity in a QSFP form factor suitable for switches, routers and optical modules that accept QSFP interfaces. Use it to extend data center or campus fiber connections where bidirectional SR2 optical links are required.

## Long description

The BlueOptics BO25K856S2D QSFP transceiver is designed for 40GBASE-SR2-BIDI short-range multimode fiber links and supports data rates up to 40 Gbps. Housed in a QSFP form factor, this optical module enables bidirectional two-lane operation over multimode fiber with a reach of up to 100 meters, making it suitable for high-density switch and router interfaces in data center and campus environments. The module is intended for sockets and devices that accept QSFP optical transceivers and supports standard 40GBASE-SR2-BIDI signaling for interoperable fiber connections.
Advantages
The transceiver offers a compact QSFP footprint that consolidates high-speed connectivity into a single module while keeping port density high. Its bidirectional SR2 optical design reduces fiber cabling requirements by enabling two-way transmission over paired multimode fibers. Support for standard 40GBASE-SR2-BIDI signaling ensures compatibility with equipment that follows common optical interface specifications. The module is optimized for short-reach links up to 100 meters, providing a predictable performance profile for multimode fiber infrastructures.
Suitable for
 40 Gbps short-range uplinks between switches in data centers and server rooms
 Interconnects on campus networks where multimode fiber is deployed
 High-density aggregation ports on routers and optical switches supporting QSFP
 Deployments requiring bidirectional SR2 links to minimize fiber cabling
Key specifications
 Form factor: QSFP (Quad Small Form-factor Pluggable)
 Standard: 40GBASE-SR2-BIDI
 Data rate: 40 Gbps aggregate
 Fiber type: Multimode fiber (MMF)
 Maximum reach: up to 100 meters on appropriate multimode fiber
 Wavelength/lanes: Bidirectional two-lane operation (BIDI SR2)
How to use
Install the transceiver into a compatible QSFP port on a switch, router or optical interface module following the host device manufacturer’s hot-plug instructions. Connect multimode fiber cables with the correct MPO/LC or vendor-specified connectors and ensure polarity and lane mapping match the paired transceiver at the remote end. Verify link status via the host device LEDs or management interface and confirm that the port is configured for 40G operation. For best results, use multimode fiber of appropriate grade and maintain clean connector end-faces before mating.
Usage recommendations
Use this module in multimode fiber installations with verified fiber type and link loss budgets; clean and inspect connectors before installation and ensure the host device supports 40GBASE-SR2-BIDI QSFP transceivers. For reaches approaching 100 meters, confirm fiber modal bandwidth and connector/patch panel losses to maintain reliable link performance.

## FAQ

### How much does the QSFP Transceiver BlueOptics BO25K856S2D 40GBASE-SR2-BIDI cost, and is it available for purchase?

The price is 793.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 27 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, Leasing for legal entities. 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

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