# BlueOptics QSFP Transceiver A5U9-BO 40GBASE-ESR4 MPO/MTP Multimode 4×850nm 300m 0–70°C

**URL:** https://aio.lv/en/product--blueoptics-a5u9-bo--12218026
**Data updated:** 2026-03-27 13:58 (EET)
**Category:** Network Media Converters
**Manufacturer:** BlueOptics
**Manufacturer code:** A5U9-BO
**EAN:** 4063232350127
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 119.49 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 98.75 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-a5u9-bo--12218026

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 29.07.2026 | free |
| Pickup points | 03.08.2026 | 1.89 EUR |
| Courier delivery to door | 03.08.2026 | 4.99 EUR |

## Summary description

Compatibility transceiver BlueOptics A5U9-BO is a QSFP module for 40GBASE-ESR4 links over multimode fiber using MPO/MTP connectors. It transmits on four 850 nm lanes (4×850 nm) and supports up to 300 m reach. Operating range is 0°C to +70°C. Suited for high-speed data center uplinks, switch-to-switch and spine/leaf aggregation in campus and enterprise networks.

## Long description

BlueOptics QSFP Transceiver A5U9-BO 40GBASE-ESR4 MPO/MTP Multimode 4×850nm 300m is a compact QSFP form-factor optical module designed for 40 Gigabit Ethernet links over multimode fiber. It uses an MPO/MTP connector and four parallel 850 nm lanes to deliver aggregate 40 Gbit/s bandwidth with reach up to 300 meters over compatible multimode cabling. The transceiver operates across a commercial temperature range and is intended for use in data center uplinks, switch-to-switch connections and aggregation layers in campus and enterprise networks.
Advantages
The module provides a high-density 40G interface in a small QSFP package while maintaining multimode fiber compatibility and MPO/MTP connectivity for parallel optics. Its four-lane design at 850 nm supports standard multimode cabling distances to 300 meters, enabling flexible placement of switches and equipment within racks and across rooms. The rated operating temperature range supports conventional data center and telecom equipment environments.
Suitable for
 Data center uplinks and top-of-rack to aggregation links
 Switch-to-switch 40G connections in campus and enterprise networks
 Spine-and-leaf aggregation fabrics using multimode MPO/MTP cabling
 High-density switch ports requiring QSFP 40G optics
Key specifications
 Form factor: QSFP (Quad Small Form-factor Pluggable)
 Standard: 40GBASE-ESR4 (40 Gigabit Ethernet, extended short reach)
 Fiber type: Multimode fiber (MMF)
 Connector: MPO / MTP
 Wavelength: 4 × 850 nm lanes
 Maximum reach: up to 300 meters over compatible multimode fiber
 Operating temperature range: 0°C to +70°C
 Data rate: 40 Gbit/s aggregate (4 × 10G lanes)
How to use
Install the QSFP transceiver into a compatible QSFP port on switches, routers or media converters ensuring the host device supports 40GBASE-ESR4 optics. Connect MPO/MTP multimode fiber cables with correct polarity and verified fiber type (OM3/OM4 as applicable) to achieve the specified reach. Verify link status on the host device and monitor optical diagnostics if supported. Handle the transceiver and fiber connectors with appropriate electrostatic discharge precautions and keep dust caps on connectors when not in use.
Usage recommendations
For reliable performance, use certified multimode fiber (OM3 or OM4) and MPO/MTP trunk assemblies, confirm polarity and cleanliness of connectors, and ensure the host system firmware supports standard 40GBASE-ESR4 modules. Avoid exceeding the specified temperature range and inspect connectors for contamination before installation.

## FAQ

### How much does the BlueOptics QSFP A5U9-BO 40GBASE-ESR4 Transceiver 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 29.07.2026 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 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/12218026/67907351_large.webp