# Network QSFP Transceiver BlueOptics BO25K13640D 40GBASE-ER4 40 km

**URL:** https://aio.lv/en/product--blueoptics-qsfp40g-er4-bo--10621348
**Data updated:** 2026-02-25 16:39 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** BlueOptics
**Manufacturer code:** QSFP+40G-ER4-BO
**EAN:** 4063232310954
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 880.49 €
**Prices and availability valid until:** 2026-08-10 23:59
**Price without VAT (21%):** 727.68 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-qsfp40g-er4-bo--10621348

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.08.2026 | free |
| Pickup points | 13.08.2026 | 1.89 EUR |
| Courier delivery to door | 13.08.2026 | 4.99 EUR |

## Summary description

QSFP transceiver BlueOptics BO25K13640D implements 40GBASE-ER4 standard for 40 Gbps optical links up to 40 km over single-mode fiber. Designed for data center and telecom aggregation, it fits QSFP ports to enable high-speed long-reach connections between switches, routers and optical equipment. Plug-and-play compatibility simplifies installation and upgrade.

## Long description

The BlueOptics BO25K13640D QSFP transceiver implements the 40GBASE-ER4 standard to provide 40 Gbps optical links over single-mode fiber for distances up to 40 km. Designed for use in data centers and telecom aggregation sites, this QSFP module fits standard QSFP ports on switches, routers and optical equipment to enable long-reach, high-bandwidth interconnects. The module supports plug-and-play installation to simplify upgrades and deployment of 40G infrastructure.
Advantages
This 40GBASE-ER4 transceiver delivers long-reach connectivity over single-mode fiber with low insertion complexity and high compatibility with QSFP form-factor interfaces. It enables consolidation of multiple 10 Gbps lanes into a single 40 Gbps link, reducing cable count and port usage while maintaining low latency and stable performance over extended distances. The module’s standardized optical specifications ensure predictable link budgeting for network planning.
Suitable for
 Data center spine-to-leaf and switch-to-switch long-reach interconnects
 Telecom aggregation and metro edge links up to 40 km
 Long-distance uplinks between equipment rooms or campus sites
 High-bandwidth connections for storage and compute clusters
Key specifications
 Form factor: QSFP (Quad Small Form-factor Pluggable)
 Standard: 40GBASE-ER4
 Nominal data rate: 40 Gbps aggregate
 Transmission medium: single-mode fiber
 Maximum reach: up to 40 km (single-mode, compliant link budget)
 Optical interface: wavelength-multiplexed 4x10 Gbps lanes
 Connector type: compatible with standard single-mode fiber connectors
How to use
Install the QSFP transceiver into a compatible QSFP port on your switch, router or optical device until it clicks into place. Connect single-mode fiber patch cords to the module’s optical interface using the appropriate connectors and ensure the opposite end is terminated to a matching 40GBASE-ER4 link partner. Verify that the host device recognizes the module and monitor link status and optical parameters via the device management interface. Follow standard handling precautions for electrostatic discharge and avoid bending the fiber beyond recommended radii.
Usage recommendations
For reliable long-reach performance, verify end-to-end attenuation and dispersion budgets for single-mode fiber spans approaching 40 km, use quality single-mode patch cords and maintain proper fiber routing. Confirm compatibility with the host equipment vendor’s supported transceiver list and monitor optical power and error statistics after deployment.

## FAQ

### How much does the QSFP Transceiver BlueOptics BO25K13640D 40GBASE-ER4 cost, and is it available for purchase?

The price is 880.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 20 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 10.08.2026 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

https://aio.lv/img/cache/product/10621348/66006627_large.webp