# InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-3M-AT-BL 3m QSFP28 4xSFP28 Male/Male

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-at-bl--4466068
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-AT-BL
**EAN:** 4063232122878
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 159.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-at-bl--4466068

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.08.2026 | free |
| Pickup points | 12.08.2026 | 1.89 EUR |
| Courier delivery to door | 12.08.2026 | 4.99 EUR |

## Summary description

The BlueOptics Q28-4S28-DAC-3M-AT-BL is a 3m InfiniBand/fibre optic cable featuring a QSFP28 connector and 4xSFP28 connectors. It is designed for high-speed data transmission, ensuring reliable connectivity in data centers and networking environments. The male/male configuration allows for easy integration with compatible devices, making it an ideal choice for enhancing network performance.

## Long description

The BlueOptics Q28-4S28-DAC-3M-AT-BL is a 3 m QSFP28 to 4xSFP28 direct attach cable (DAC) designed for high-speed InfiniBand and Ethernet connections in rack and adjacent-rack installations. This passive twinax copper breakout cable supports aggregated 100G data rates (4x25G lanes) and provides a compact, low-latency link between QSFP28 ports and four SFP28 ports. The male-to-male connector configuration and MSA-compliant mechanical and electrical interfaces ensure interoperability with hardware that supports QSFP28 breakout DACs.
Advantages
The cable offers low power consumption typical of passive DACs, minimal latency and predictable signal integrity for short-reach interconnects. With 26 AWG twinax construction and MSA-compliant QSFP28/SFP28 interfaces, it provides a reliable, mechanically robust connection suitable for data center top-of-rack and adjacent-rack links. Tested component selection and manufacturing processes are used to maintain compatibility and service life suitable for professional network deployments.
Suitable for
High-speed connections between QSFP28 ports and multiple SFP28 ports in switches and routers
Top-of-rack (ToR) and adjacent-rack wiring in data centers
Server to switch or switch to storage system short-reach links
InfiniBand and Ethernet applications up to 100 G aggregated bandwidth over 3 m
Key specifications
Length: 3 meters
Connector configuration: QSFP28 (male) to 4 × SFP28 (male)
Supported protocols: 100GBase-CR4 / 4×25GBASE-CR, InfiniBand compatible
Cable type: Passive twinax copper (DAC)
Wire gauge: 26 AWG
MSA compliance: QSFP28 breakout DAC mechanical and electrical specifications
Typical use case range: short-reach rack/adjacent-rack connections
How to use
Install by inserting the QSFP28 end into a compatible QSFP28 port and each SFP28 plug into the corresponding SFP28 ports on the target device. Ensure both devices support passive QSFP28-to-SFP28 breakout DACs and the intended link speed and protocol. Route the cable to avoid sharp bends and mechanical strain; use proper cable management to maintain bend radius and prevent connector stress. Power off or follow hot-plug procedures per device documentation if required by your hardware vendor before insertion or removal.
Usage recommendations
Verify device compatibility with QSFP28 breakout DACs in vendor documentation and, if available, test a sample in your target hardware before large deployments. Keep the cable within recommended bend radius, avoid exposure to moisture or corrosive environments, and use in short-reach applications where passive DACs are supported to benefit from low latency and low power consumption.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.25 kg |
| Package weight | 260 g |
| Cable length | 3 m |
| Data transfer rate | 100 Gbit/s |
| Product colour | Black |
| Connector 1 | QSFP28 |
| Connector 2 | 4xSFP28 |

## FAQ

### How much does the InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-3M-AT-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 — 29 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 07.08.2026 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/4466068/58966837_large.webp