# InfiniBand/fibre optic cable BlueOptics 845408-B21-BL 5 m QSFP28 Male/Male

**URL:** https://aio.lv/en/product--blueoptics-845408-b21-bl--5038825
**Data updated:** 2026-03-07 15:11 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** 845408-B21-BL
**EAN:** 4063232258140
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 212.49 €
**Prices and availability valid until:** 2026-08-04 23:59
**Price without VAT (21%):** 175.61 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-845408-b21-bl--5038825

## 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

The BlueOptics 845408-B21-BL is a 5 m InfiniBand/fibre optic cable featuring QSFP28 connectors on both ends. Designed for high-speed data transfer, it ensures reliable connectivity in data centers and networking environments. The male/male configuration allows for easy integration with compatible devices, making it an essential component for modern networking solutions.

## Long description

The BlueOptics 845408-B21-BL is a 5 m InfiniBand/fibre optic direct attach cable with QSFP28 connectors on both ends. Designed for short-range high-speed links, this passive QSFP28-to-QSFP28 cable supports 100G data rates and is intended for use in rack and adjacent-rack connections in data centers and networking environments. Its male/male QSFP28 terminations provide straightforward insertion into compatible 100G ports on switches, routers and storage systems that accept QSFP28 direct attach twinax or electrically compatible connections.
Advantages
This 5 m BlueOptics cable offers a compact, low-latency connection option for short-distance links with support for 100GBase-CR4, InfiniBand and other high-speed protocols. As a passive direct attach solution, it requires no external power or transceiver modules, reducing power consumption and simplifying deployment. The cable is manufactured to industry MSA guidelines and uses robust QSFP28 connectors to ensure mechanical stability and reliable electrical contact in high-density rack installations.
Подходит для
Connecting 100G QSFP28 ports in the same rack or adjacent racks
High-throughput links for switches, routers and storage arrays
Short-range InfiniBand or Ethernet links (100GBase-CR4)
Key specifications
Cable length: 5 m
Connector type: QSFP28 to QSFP28, male/male
Supported link rate: up to 100 Gbit/s
Physical medium: passive twinax / electrically coupled direct attach
Wire gauge: 26 AWG (as used in industry-standard twinax DACs)
Compatible protocols: 100GBase-CR4 Ethernet, Fibre Channel, FCoE and InfiniBand (where supported)
Intended use: short-range rack and adjacent-rack cabling
How to use
Install the cable by inserting each QSFP28 plug into the corresponding QSFP28 port until the latch engages. Confirm that connected devices support passive QSFP28 direct attach twinax connections and the intended protocol (for example, 100GBase-CR4 or InfiniBand). After physical connection, verify link status and negotiated speed in the device management interface. For best results, route the cable to avoid sharp bends and mechanical strain on the connectors.
Usage recommendations
Use this 5 m passive QSFP28 cable for short-distance interconnects where low latency, low power consumption and predictable electrical performance are required. Ensure both endpoints explicitly support passive DACs and the chosen protocol. Avoid exceeding the specified bend radius and protect the cable from excessive pulling or crushing to maintain long-term reliability.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.15 kg |
| Package weight | 160 g |
| Cable length | 5 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 845408-B21-BL cost, and is it available for purchase?

The price is 212.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 356 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. 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/5038825/64338433_large.webp