# DAC cable CBO Q28-4S28-DAC-3M 3 m QSFP28 to QSFP28 Twinax Direct Attach Copper

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-gm-bl--4466077
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-GM-BL
**EAN:** 4063232122922
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-08-05 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-gm-bl--4466077

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.08.2026 | free |
| Pickup points | 06.08.2026 | 1.89 EUR |
| Courier delivery to door | 06.08.2026 | 4.99 EUR |

## Summary description

CBO Q28-4S28-DAC-3M is a 3-meter Direct Attach Copper (DAC) twinax cable with QSFP28 connectors on both ends. Designed for short-reach, high-speed interconnects in data centers, it supports QSFP28 ports for up to 100GbE links, low latency and reduced power compared with optical modules. Suitable for switch-to-switch, switch-to-server, or within-rack connections.

## Long description

CBO Q28-4S28-DAC-3M is a 3 m Direct Attach Copper (DAC) twinax cable with QSFP28 connectors on both ends, intended for short-reach, high-speed interconnects in data center environments. The cable provides a cost-effective, low-latency way to connect QSFP28 ports for 100 Gigabit Ethernet links where optical transceivers are not required. Its fixed-length twinax design delivers consistent electrical performance and simplified installation for within-rack and adjacent-rack connections.
Advantages
The DAC cable offers low power consumption and minimal latency compared with active optical solutions, while maintaining signal integrity for short distances. As a passive twinax assembly with QSFP28 connectors, it reduces component count and simplifies port provisioning. The robust copper conductors and molded connector housings provide reliable mechanical stability for frequent plug-and-play use in dense rack deployments.
Suitable for
Switch-to-switch connections in the same rack or adjacent racks
Switch-to-server links using QSFP28 ports
High-performance computing clusters requiring short-reach 100GbE interconnects
Top-of-rack (ToR) and within-rack cabling where optics are not necessary
Key specifications
Connector type: QSFP28 to QSFP28
Cable type: Twinax Direct Attach Copper (DAC)
Length: 3 metres
Supported data rate: up to 100 Gb/s per link (QSFP28)
Application: short-reach, within-rack and adjacent-rack interconnects
Latency: low, passive copper electrical link
How to use
Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port until the latch engages. Ensure that both devices support passive DAC cables at the intended data rate and that ports are configured for 100GbE operation. Route the cable to avoid sharp bends and mechanical strain; maintain the manufacturer’s minimum bend radius. For removal, disengage the connector latch and pull straight out to avoid damaging the port or cable.
Usage recommendations
Use this 3 m twinax DAC for short-distance links inside racks or between adjacent racks. Verify compatibility with your network equipment’s QSFP28 ports and firmware, and follow cable routing best practices to preserve signal integrity and mechanical lifespan.

## FAQ

### How much does the CBO QSFP28 DAC cable Q28-4S28-DAC-3M 3 m 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 03.08.2026 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/4466077/59853022_large.webp