# Network Cable BlueOptics Q28-4S28-DAC-2M-AT-BL QSFP28 4xSFP28 InfiniBand 2m Black

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-2m-at-bl--10894262
**Data updated:** 2026-03-07 18:09 (EET)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-2M-AT-BL
**EAN:** 4063232122564
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 173.49 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 143.38 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-2m-at-bl--10894262

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 31.07.2026 | free |
| Pickup points | 05.08.2026 | 1.89 EUR |
| Courier delivery to door | 05.08.2026 | 4.99 EUR |

## Summary description

The BlueOptics Q28-4S28-DAC-2M-AT-BL is a high-performance InfiniBand/fibre optic cable designed for efficient data transmission. With a length of 2 meters, it features a QSFP28 connector on one end and four SFP28 connectors on the other, making it ideal for connecting multiple devices. The male/male configuration ensures a secure connection, while the black color provides a sleek look. This cable is perfect for data centers and high-speed networking environments.

## Long description

The BlueOptics Q28-4S28-DAC-2M-AT-BL is a 2 m direct-attach twinax cable with a QSFP28 connector on one end and four SFP28 connectors on the other. Designed for short-reach, high-speed links in racks and between adjacent racks, this passive 100GBase-CR4 / 4x25GBASE-CR twinax cable delivers electrical 100 Gbit/s connectivity when used with hardware that supports QSFP28 breakout to 4x25G SFP28. The cable is black, lightweight (approx. 0.25 kg) and MSA-compliant for interoperability with a wide range of switches, routers and storage systems from major vendors.
Advantages
This direct attach cable provides low-latency, low-power connectivity for short-distance, high-bandwidth applications. As a passive twinax assembly it does not require external power or transceivers, reducing power consumption and potential points of failure. MSA-compliant electrical and mechanical design ensures compatibility with equipment that supports QSFP28-to-4xSFP28 breakout configurations, and the compact 2 m length is suited to rack-to-rack or intra-rack connections.
Suitable for
 High-speed breakout links: QSFP28 to 4x25G SFP28 connections
 Data centre rack-to-rack or intra-rack connections
 100G Ethernet, FCoE, Fibre Channel and InfiniBand short-reach links
 Switches, routers and storage systems that support passive DAC twinax cabling
Key specifications
 Cable length: 2 m
 Connector A: QSFP28 (male)
 Connector B: 4 × SFP28 (male)
 Transmission: passive twinax for up to 100 Gbit/s (QSFP28 breakout to 4 × 25 Gbit/s)
 Conductor gauge: 26 AWG (typical for twinax DAC)
 Product colour: Black
 Approx. weight: 0.25 kg
 MSA-compliant QSFP28 breakout DAC
How to use
Install the BlueOptics Q28-4S28-DAC-2M-AT-BL by inserting the QSFP28 plug into the QSFP28 port of the source device and the four SFP28 plugs into the corresponding SFP28 ports of the destination device or devices. Ensure both ends are fully seated and that the host hardware supports passive DAC breakout operation and the intended protocol (e.g., 100GBase-CR4 or 4x25GBASE-CR). No external power or transceivers are required. After connection, verify link status and speed via the equipment management interface and monitor for any error counters during initial operation.
Usage recommendations
If used in data centre environments, keep the cable length suitable for the intended deployment (2 m for close rack or adjacent-rack links), avoid tight bends or excessive pulling force, and connect only to hardware that officially supports passive QSFP28-to-4xSFP28 DACs to ensure full functionality and reliability.

## Specifications

| Feature | Value |
|---|---|
| Data transfer rate | 100 Gbit/s |
| InfiniBand protocol | Yes |

### Features

| Feature | Value |
|---|---|
| Cable length | 2 m |
| Connector 1 | QSFP28 |
| Connector 2 | 4xSFP28 |
| Product colour | Black |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.25 kg |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 260 g |

## FAQ

### How much does the Network Cable BlueOptics Q28-4S28-DAC-2M-AT-BL cost, and is it available for purchase?

The price is 173.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 56 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 31.07.2026 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: cable length, connector 1, connector 2, weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/10894262/64098913_large.webp