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header-product Transceiver BlueOptics BO25K859S3D 40G-QSFP-ESR4 Copper 10000 Mbit/s SFP+
119.49 €

Transceiver BlueOptics BO25K859S3D 40G-QSFP-ESR4 Copper 10000 Mbit/s SFP+

Transceiver BlueOptics BO25K859S3D 40G-QSFP-ESR4 Photo 1
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Short description

The BlueOptics BO25K859S3D is a 40G-QSFP-ESR4 compatible transceiver designed for high-speed data transfer. It supports a maximum data rate of 10000 Mbit/s and features a copper interface type SFP+. This lightweight module weighs only 20 g and is compatible with Dell products, making it ideal for network expansions and upgrades.
Available for order: 86 pcs.
Warranty: 2 Years
SKU: 10621321
Manufacturer: BlueOptics
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.79 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
27.08.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
01.09.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 1.00 kg)
Parcel couriers
Unisend LV / Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts pakomāts / DPD Paku skapis / Omniva LV / Latvijas Pasts nodaļa
01.09.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.79 €
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Product information

Description

The BlueOptics BO25K859S3D 40G-QSFP-ESR4 Copper transceiver is a compact module designed for high-speed network environments. It supports up to 10000 Mbit/s and uses a copper SFP+ interface to provide a short-range, high-throughput connection. The module is lightweight and compatible with Dell hardware, intended for network expansions, server uplinks and switch interconnects where a reliable 10 Gigabit Ethernet link is required.

Advantages

This transceiver offers a compact form factor and a copper SFP+ interface that simplifies installation in existing 10 Gigabit Ethernet ports. Its support for up to 10000 Mbit/s enables high-throughput links for data centre and enterprise networks. The module’s short maximum link distance is suitable for rack-to-rack and within-rack connections, and the lightweight metal housing contributes to thermal stability and mechanical robustness in dense installations.

Suitable for

  • Rack-to-rack connections in data centres
  • Switch-to-server uplinks requiring 10 Gigabit Ethernet
  • Short-reach horizontal cabling within telecom rooms
  • Upgrading Dell network equipment to support higher throughput

Key specifications

  • Maximum data transfer rate: 10000 Mbit/s
  • Interface type: SFP+ (copper)
  • Ethernet interface: 10 Gigabit Ethernet
  • Ethernet LAN (RJ-45) ports: 1
  • Maximum transfer distance: 30 m
  • Product colour: Silver
  • Weight: 0.02 kg

How to use

Before installation, verify compatibility with the target switch or server, especially Dell equipment if applicable. Power down or follow hot‑swap procedures recommended by the hardware vendor, then insert the SFP+ copper transceiver into an available 10 Gigabit Ethernet slot until it seats firmly. Connect a suitable CAT6/CAT6A copper cable to the RJ‑45 port and configure the network interface in the operating system or switch management software to match the desired speed and duplex settings. Monitor link status LEDs and management interfaces to confirm the link is operational.

Usage recommendations

Use the transceiver for short-distance high-speed links up to 30 m with appropriate shielded or unshielded copper cabling rated for 10 Gigabit Ethernet. Ensure firmware and driver compatibility on connected devices and follow vendor guidelines for hot‑swap and electrostatic discharge protection during handling and installation.

Specifications

Maximum transfer distance: The greatest distance over which the data/signal can be transferred.
30 m
Maximum data transfer rate: The maximum speed with which data can be transmitted from one device to another.
10000 Mbit/s
All features
Interface type:
SFP+
Ethernet LAN: An Ethernet LAN (Local Area Network) interface is present, for a wired conection via a cable.
Yes
Compatible products: Other products that can be used with this product.
407-BCVC
Hot-Plug support: Device has hot-plug capability, which means that user can replace system components without shutting down the system.
Yes
Easy to install:
Yes
Brand compatibility: What other brands this brand can be used with.
Dell
SFP transceiver type:
Copper
SFP transceiver standard:
T

Other features

Form factor: The shape or design of the product.
SFP+

Operational conditions

Operating temperature (T-T): The minimum and maximum temperatures at which the product can be safely operated.
0 - 70

Weight & dimensions

Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
0.02 kg

Ports & interfaces

Ethernet LAN (RJ-45) ports: Number of Ethernet LAN (RJ-45) ports (connecting interfaces) in the device. Ethernet LAN (RJ-45) ports allow a computer to connect to the ethernet.
1

Features

Product colour: The colour e.g. red, blue, green, black, white.
Silver
Hot-swap:
Yes

Performance

Maximum transfer distance: The greatest distance over which the data/signal can be transferred.
30 m

Network

Copper ethernet cabling technology:
10GBASE
Ethernet interface type:
10 Gigabit Ethernet
Maximum data transfer rate: The maximum speed with which data can be transmitted from one device to another.
10000 Mbit/s

Description

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Customer reviews

Customer questions

FAQ

How much does the Transceiver BlueOptics BO25K859S3D 40G-QSFP-ESR4 cost, and is it available for purchase?

The price is 119.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 86 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 27.08.2026 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: maximum transfer distance, maximum data transfer rate, 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.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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Fast Delivery Get your orders as quickly as possible — right to your door, parcel lockers, or pickup points across Latvia and the EU.
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Secure Payment Pay the way you prefer: cash, VISA, MasterCard, Apple Pay, Google Pay, bank transfer, or 0% installment plan.
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Quality Since 2008 AiO.lv has been on the market for over 18 years and has earned trust — with more than 6000 genuine positive reviews on Google.