# DAC cable CBO Q28-4S28-DAC-3M-CO-BL QSFP28 direct-attach copper, 3 m

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-co-bl--4466072
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-CO-BL
**EAN:** 4063232122939
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-08-02 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-co-bl--4466072

## 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

Direct-attach copper (DAC) cable CBO Q28-4S28-DAC-3M-CO-BL with QSFP28 connectors and 3 m length. Designed for short-reach high-speed connections between QSFP28 ports, it provides a cost-effective, low-latency link for switches, servers and storage equipment. Suitable for data center interconnects, rack-to-rack links and switch uplinks where a reliable 3‑meter copper connection is required.

## Long description

Direct-attach copper (DAC) cable CBO Q28-4S28-DAC-3M-CO-BL is a 3 meter, high-speed twinax cable terminated with QSFP28 connectors. Engineered for short-reach connections between QSFP28 ports, this BlueOptics DAC offers a low-latency, energy-efficient physical link for switches, servers and storage systems in data center and rack environments. The fixed-length copper assembly eliminates the need for optical transceivers for short links while providing reliable electrical signal integrity at 100Gb/s class speeds.
Advantages
The CBO Q28-4S28-DAC-3M-CO-BL delivers predictable performance with minimal power consumption compared to active optical solutions. Its direct-attach design reduces system complexity and total cost for short distance interconnects. With a compact QSFP28 form factor and robust twinax construction, the cable provides stable signal transmission and a plug-and-play experience for compatible QSFP28 ports.
Suitable for
Rack-to-rack connections inside data centers
Switch uplinks and high-bandwidth switch-to-switch links
Server-to-switch and storage-to-switch short-reach links
Key specifications
Connector type: QSFP28 to QSFP28
Length: 3 m
Cable type: Twinax direct-attach copper (DAC)
Data rate: Compatible with 100Gb/s QSFP28 interfaces
Transmission: Short-reach electrical link optimized for rack environments
Power: Passive copper assembly (low power consumption)
How to use
Insert each QSFP28 connector into the corresponding QSFP28 port on your devices until the latch engages. Ensure compatible port configurations and link settings on switches or host adapters prior to use. For reliable operation, route the cable to avoid sharp bends and mechanical strain; observe the manufacturer’s minimum bend radius. The cable is intended for in-rack or short-distance interconnects and does not require separate transceivers or power.
Usage recommendations
Verify compatibility with your network equipment and firmware; confirm that QSFP28 ports support passive DACs. Avoid exceeding the specified bend radius, keep connectors free of dust, and handle the cable by the connector housings during installation and removal to maintain signal integrity and prolong service life.

## FAQ

### How much does the CBO QSFP28 DAC cable Q28-4S28-DAC-3M-CO-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 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

## Image

https://aio.lv/img/cache/product/4466072/59859297_large.webp