# InfiniBand/fibre optic cable BlueOptics QFX-Q-S-DAC-3M-BL 3m QSFP28 4xSFP28 Male/Male

**URL:** https://aio.lv/en/product--blueoptics-qfx-q-s-dac-3m-bl--4466203
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** QFX-Q-S-DAC-3M-BL
**EAN:** 4063232641904
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 159.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-qfx-q-s-dac-3m-bl--4466203

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

The BlueOptics QFX-Q-S-DAC-3M-BL is a 3-meter InfiniBand/fibre optic cable featuring a QSFP28 connector and four SFP28 connectors. Designed for high-speed data transmission, this cable ensures reliable connectivity in data centers and networking environments. Its male-to-male configuration makes it versatile for various applications.

## Long description

The BlueOptics QFX-Q-S-DAC-3M-BL is a 3 m direct attach cable (DAC) with a QSFP28 plug on one end and four SFP28 plugs on the other, providing a straightforward solution for short-range 100G connections. This passive twinax copper cable implements 100GBase-CR4 / 4x25GBASE-CR signaling and is intended for linking compatible switches, routers and storage systems inside racks or between adjacent racks where a 3-meter copper DAC meets the required transmission protocol.
Advantages
This passive DAC offers a low-power, low-latency connection for short-distance 100G and 4x25G links and is built to MSA-compliant mechanical standards. The cable is manufactured using high-quality components and is tested for compatibility with hardware that supports the equivalent Juniper QFX-Q-S-DAC-3M reference cable. Its passive design reduces complexity and failure points compared with active optical assemblies, simplifying installation and maintenance in data center environments.
Suitable for
High-density switch-to-switch connections within racks
Interconnects between adjacent rack units
Connecting 100G QSFP28 ports to breakout 4x25G SFP28 ports
Short-reach server and storage system links that accept passive DACs
Key specifications
Length: 3 meters
Connector types: QSFP28 (one end) to 4 × SFP28 (other end)
Supported protocols: 100GBase-CR4 and 4×25GBASE-CR electrical signaling
Cable type: Passive twinax copper DAC
Conductor gauge: 26 AWG
MSA-compliant mechanical and electrical form factor
How to use
Insert the QSFP28 plug into the host QSFP28 port and insert the four SFP28 plugs into their corresponding SFP28 ports or a breakout module following equipment guidelines. Ensure both devices support passive DAC connections and the intended protocol (100GBase-CR4 or 4×25GBASE-CR). Avoid excessive bending or mechanical strain on the cable and verify link state in the network equipment management interface after installation.
Usage recommendations
Use this cable for short physical runs (up to 3 m) inside racks or between adjacent racks; confirm passive DAC support in device documentation and perform a link test after installation. Store and route the cable to avoid sharp bends and protect connector ends from contamination when not connected.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.25 kg |
| Cable length | 3 m |
| Data transfer rate | 100 Gbit/s |
| Product colour | Black |
| Package height | 260 mm |
| Connector 1 | QSFP28 |
| Connector 2 | 4xSFP28 |
| Sustainability certificates | RoHS |
| Warranty period | 5 year(s) |

## FAQ

### How much does the InfiniBand/fibre optic cable BlueOptics QFX-Q-S-DAC-3M-BL cost, and is it available for purchase?

The price is 192.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 19 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 27.07.2026 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/4466203/58966895_large.webp