# InfiniBand/fibre optic cable BlueOptics X2121A-05M-N-BL 0.5 m QSFP Male/Male

**URL:** https://aio.lv/en/product--blueoptics-x2121a-05m-n-bl--4471811
**Data updated:** 2026-02-25 16:36 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** X2121A-05M-N-BL
**EAN:** 4063232144689
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 80.99 €
**Prices and availability valid until:** 2026-08-06 23:59
**Price without VAT (21%):** 66.93 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-x2121a-05m-n-bl--4471811

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 04.08.2026 | free |
| Pickup points | 07.08.2026 | 1.89 EUR |
| Courier delivery to door | 07.08.2026 | 4.99 EUR |

## Summary description

The BlueOptics X2121A-05M-N-BL is a 0.5 m InfiniBand/fibre optic cable featuring QSFP connectors on both ends. Designed for high-speed data transmission, it ensures reliable connectivity in data centers and high-performance computing environments.

## Long description

The BlueOptics X2121A-05M-N-BL is a 0.5 m InfiniBand/fibre optic Direct Attach Cable (DAC) with QSFP connectors on both ends. Designed for high-speed short-reach links, this passive twinax copper style cable supports up to 40 Gbit/s over a half-meter distance and is suitable for rack-to-rack or intra-rack connections in data centers and high-performance computing environments. The cable follows QSFP MSA guidelines and is built to provide stable electrical transmission for Ethernet, Fibre Channel, FCoE and InfiniBand protocols where passive QSFP-to-QSFP DACs are supported.
Advantages
This 0.5 m QSFP-to-QSFP cable offers a low-latency, low-power passive connection optimized for short distances. The cable’s 30 AWG twinax construction provides predictable signal integrity for 40GBase-CR4 type links while avoiding the need for active components. Compliance with QSFP MSA electrical and mechanical specifications ensures broad interoperability with hardware platforms that accept QSFP passive DACs. Passive design reduces power consumption and failure points compared with active optical modules, and use of quality components contributes to long service life.
Suitable for
High-speed links between switches and routers within the same rack or adjacent racks
Short-reach connections for storage systems and SAN environments
InfiniBand and 40G Ethernet interconnects in HPC clusters and data centers
Environments that require low-latency, low-power passive QSFP connections
Key specifications
Cable type: passive twinax (DAC) with QSFP-to-QSFP connectors
Length: 0.5 meter
Data rate: up to 40 Gbit/s (40GBase-CR4 compatible)
Wire gauge: 30 AWG
Supported protocols: Ethernet, Fibre Channel, FCoE, InfiniBand (where passive QSFP DAC is supported)
Form factor: QSFP male to QSFP male
MSA compliance: QSFP electrical and mechanical interoperability
How to use
Connect each QSFP plug to the corresponding QSFP port on compatible network switches, routers or storage interfaces. Ensure the host hardware explicitly supports passive QSFP DACs and the chosen transmission protocol (for example, 40GBase-CR4). Handle the cable by the connector housings when routing, avoid tight bends near the connector area, and secure the cable to prevent strain on the QSFP plugs. No power or configuration is required for the cable itself; any link negotiation is handled by the connected devices.
Usage recommendations
Use this 0.5 m BlueOptics QSFP passive DAC for short, high-throughput interconnects inside racks or between immediately adjacent racks. Verify hardware compatibility for passive QSFP DAC support, follow manufacturer port guidelines, and test in a representative setup before full deployment to confirm link speed and protocol interoperability.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.15 kg |
| Package weight | 160 g |
| Cable length | 0.5 m |
| Data transfer rate | 40 Gbit/s |
| Product colour | Black |
| Connector 1 | QSFP |
| Connector 2 | QSFP |
| InfiniBand protocol | Yes |

## FAQ

### How much does the InfiniBand/fibre optic cable BlueOptics X2121A-05M-N-BL cost, and is it available for purchase?

The price is 80.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 118 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 04.08.2026 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/4471811/64303437_large.webp