# InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-1M-AT-BL 1m QSFP28 4xSFP28 Male/Male

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-1m-at-bl--5041771
**Data updated:** 2026-02-25 16:38 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-1M-AT-BL
**EAN:** 4063232122182
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 134.49 €
**Prices and availability valid until:** 2026-08-17 23:59
**Price without VAT (21%):** 111.15 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-1m-at-bl--5041771

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.08.2026 | free |
| Pickup points | 20.08.2026 | 1.79 EUR |
| Courier delivery to door | 20.08.2026 | 4.99 EUR |

## Summary description

The BlueOptics Q28-4S28-DAC-1M-AT-BL is a high-performance InfiniBand/fibre optic cable designed for efficient data transmission. With a length of 1 meter, it features a QSFP28 connector on one end and four SFP28 connectors on the other, allowing for versatile connectivity options. This cable is ideal for data centers and high-speed networking applications, ensuring reliable performance and minimal latency.

## Long description

The BlueOptics Q28-4S28-DAC-1M-AT-BL is a 1 metre passive direct attach cable (DAC) with a QSFP28 connector on one end and four SFP28 connectors on the other, designed for short-reach, high-speed InfiniBand and Ethernet links. It supports 100GBase-CR4 or 4x25GBASE-CR electrical interfaces and is intended for use in rack-to-rack and intra-rack connections where low latency and high throughput are required. The cable is built to MSA-compliant form factors and uses 26 AWG twinax construction suitable for professional data centre hardware that accepts QSFP28 to 4xSFP28 breakout DACs.
Advantages
This BlueOptics QSFP28 to 4xSFP28 DAC provides low-latency, low-power connectivity for short-distance links without active transceivers. Passive twinax construction reduces power consumption and failure points compared with active optical modules. The breakout design enables a single 100G port to be split into four independent 25G channels for flexible network topologies. MSA-compliant mechanical and electrical characteristics ensure interoperability with major switch, router and storage platforms that support QSFP28 breakout DACs.
Suitable for
Rack-to-rack and adjacent-rack high-speed links in data centres
Connecting QSFP28 switch ports to multiple 25G SFP28 ports
Short-reach InfiniBand and Ethernet applications (100GBase-CR4 / 4x25GBASE-CR)
High-density top-of-rack deployments and server interconnects
Key specifications
Cable type: Passive twinax direct attach cable (DAC)
Length: 1 metre
Connector A: QSFP28 (male)
Connector B: 4 × SFP28 (male)
Supported protocols: 100GBase-CR4 and 4×25GBASE-CR (Ethernet), compatible with InfiniBand signaling
Wire gauge: 26 AWG
Form factor: QSFP28 breakout to 4×SFP28, MSA-compliant
Typical use: short-distance, rack/inter-rack connections with low latency
How to use
Install the cable by inserting the QSFP28 end into the 100G QSFP28 port and the four SFP28 ends into the respective 25G SFP28 ports, ensuring each connector clicks into place. Confirm that the host hardware supports passive QSFP28-to-4xSFP28 breakout DACs and that firmware or driver settings allow operation at the intended rates. Use the cable for links up to 1 metre; avoid bending the cable beyond the manufacturer’s minimum bend radius and ensure connectors remain free of dust and debris.
Usage recommendations
For reliable operation, verify compatibility with your switch, router or HBA vendor and, if possible, test a sample in your environment before wide deployment. Keep the cable secured to avoid strain on the connectors and maintain ambient operating temperatures specified by your networking equipment.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.25 kg |
| Package weight | 260 g |
| Cable length | 1 m |
| Data transfer rate | 100 Gbit/s |
| Product colour | Black |
| Connector 1 | QSFP28 |
| Connector 2 | 4xSFP28 |
| InfiniBand protocol | Yes |

## FAQ

### How much does the InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-1M-AT-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 — 20 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 17.08.2026 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/5041771/64353468_large.webp