# DAC cable CBO Q28-4S28-DAC-3M-NK-BL 3 m QSFP28 100 Gbit/s

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-nk-bl--4466087
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-NK-BL
**EAN:** 4063232123097
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 183.99 €
**Prices and availability valid until:** 2026-08-06 23:59
**Price without VAT (21%):** 152.06 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-nk-bl--4466087

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 05.08.2026 | free |
| Pickup points | 10.08.2026 | 1.89 EUR |
| Courier delivery to door | 10.08.2026 | 4.99 EUR |

## Summary description

Direct attach copper (DAC) cable CBO Q28-4S28-DAC-3M-NK-BL is a 3 m QSFP28 cable supporting 100 Gbit/s links. It connects QSFP28 ports for short-reach, low-latency interconnections between switches, servers or network adapters. Suitable for data center top-of-rack or adjacent racks where reliable, cost-effective 100G connectivity is required.

## Long description

Direct attach copper (DAC) cable CBO Q28-4S28-DAC-3M-NK-BL is a 3 m QSFP28 passive copper assembly designed for 100 Gbit/s short-reach connections. It provides a direct electrical link between QSFP28 ports on switches, servers and network adapters, delivering low-latency, high-throughput connectivity for dense rack environments and adjacent rack connections in data centres.
Advantages
The cable offers a compact, low-power alternative to active optical modules for short distances, with predictable latency and simplified deployment. Built for 100 Gbit/s operation over a 3 m reach, it reduces cabling complexity and eliminates the need for separate transceivers, enabling cost-effective scaling of top-of-rack and aggregation links. Its QSFP28 form factor ensures compatibility with standard QSFP28 ports and supports high-density installations.
Suitable for
Interconnection between top-of-rack switches and adjacent rack switches
Direct server-to-switch or server-to-server links supporting 100 Gbit/s
High-performance computing clusters and storage networks requiring low latency
Short-reach connections in hyperscale and enterprise data centres
Key specifications
Connector type: QSFP28 to QSFP28 passive copper
Data rate: 100 Gbit/s
Length: 3 metres
Cable type: Direct attach copper (passive DAC)
Primary use: Short-reach interconnects within racks and between adjacent racks
Latency: low, electrical transmission
Form factor: QSFP28 compatible for high-density ports
How to use
Insert each QSFP28 end of the cable into the corresponding QSFP28 port until the connector latch engages. Ensure both ports are powered and configured for a 100 Gbit/s link on the connected devices. Monitor link status via the network equipment interface and verify negotiation and error counters during initial setup. For removal, depress the latch and withdraw the connector straight out to avoid damage to the port or cable.
Usage recommendations
Place the cable to avoid sharp bends and maintain the minimum bend radius specified for copper assemblies. Use in environments with appropriate airflow and temperature control for data centre equipment. For runs beyond the recommended short-reach distance, consider active copper or optical transceivers. Verify compatibility with switch and server vendor QSFP28 port guidelines before deployment.

## FAQ

### How much does the DAC cable CBO Q28-4S28-DAC-3M-NK-BL 3 m QSFP28 cost, and is it available for purchase?

The price is 183.99 € (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 05.08.2026 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/4466087/59859301_large.webp