# InfiniBand/fibre optic cable BlueOptics 845406-B21-BL 3 m QSFP28 Male/Male

**URL:** https://aio.lv/en/product--blueoptics-845406-b21-bl--5038824
**Data updated:** 2026-03-07 15:11 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** 845406-B21-BL
**EAN:** 4063232257945
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 134.49 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 111.15 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-845406-b21-bl--5038824

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The BlueOptics 845406-B21-BL is a 3 m InfiniBand/fibre optic cable featuring QSFP28 connectors on both ends. This male-to-male cable is designed for high-speed data transmission, ensuring reliable performance in data centers and networking environments.

## Long description

The BlueOptics 845406-B21-BL is a 3 m InfiniBand/fibre optic cable with QSFP28 connectors on both ends, designed for high-speed interconnects in racks and adjacent rack spans. This QSFP28 male-to-male cable supports 100G data rates for short-distance links and is suitable for use in networking hardware that accepts QSFP28-to-QSFP28 direct attach connections. The BlueOptics cable follows common MSA-compliant form factor and is intended for reliable electrical high-speed transmission in data center and networking environments.
Advantages
The cable provides a compact, low-latency physical link with QSFP28 male connectors at each end and a 3 m length suitable for equipment-to-equipment connections within racks. As a passive direct attach twinax-style solution it offers low power consumption and reduced complexity compared with active optical modules for short runs. The construction uses industry-standard components to deliver consistent signal integrity, compatibility with major hardware platforms that support equivalent 100GBase-CR4 or InfiniBand electrical direct-attach connections, and an expected long service life when used according to specifications.
Подходит для
High-density switch-to-switch and switch-to-server connections in rack or adjacent racks
100G Ethernet (100GBase-CR4) short-reach links
InfiniBand or Fibre Channel applications that accept QSFP28 direct attach electrical links
Key specifications
Connector type: QSFP28 male to QSFP28 male
Length: 3 meters
Supported data rate: up to 100 Gbit/s per cable (protocol-dependent)
Cable type: passive direct attach twinax-style for short-distance electrical transmission
Form factor: MSA-compliant QSFP28
How to use
Insert each QSFP28 connector firmly into the matching QSFP28 port on the network devices until the latch engages. Ensure both devices support passive QSFP28 direct attach or equivalent 100GBase-CR4 electrical connections and that firmware or software settings permit passive DAC operation. Route the 3 m cable to avoid sharp bends, excessive tension or areas of high electromagnetic interference. For hot-pluggable systems, follow the device vendor’s hot-swap and ESD handling procedures when connecting or disconnecting the cable.
Usage recommendations
Use this 3 m QSFP28 direct attach cable for short intra-rack or adjacent-rack 100G links where a passive twinax-style connection is supported. Verify compatibility with the host hardware and firmware before deployment, keep bend radius and handling within vendor guidelines, and perform a link test after installation to confirm full-speed operation.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.15 kg |
| Package weight | 160 g |
| Cable length | 3 m |
| Data transfer rate | 100 Gbit/s |
| Product colour | Black, Silver |
| Connector 1 | QSFP28 |
| Connector 2 | QSFP28 |
| InfiniBand protocol | Yes |

## FAQ

### How much does the InfiniBand/fibre optic cable BlueOptics 845406-B21-BL cost, and is it available for purchase?

The price is 134.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 337 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 23.07.2026 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/5038824/64338427_large.webp