# Direct Attach Copper (DAC) Cable CBO Q28-4S28-DAC-3M-BC-BL, QSFP28, 3 m, BlueLAN

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-bc-bl--4466069
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-BC-BL
**EAN:** 4063232122892
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-08-08 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-bc-bl--4466069

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.08.2026 | free |
| Pickup points | 11.08.2026 | 1.89 EUR |
| Courier delivery to door | 11.08.2026 | 4.99 EUR |

## Summary description

CBO BlueLAN QSFP28 DAC cable Q28-4S28-DAC-3M-BC-BL is a 3-meter direct attach copper interconnect with QSFP28 connectors designed for high-speed 100GbE short-reach connections. It provides a fixed, low-latency link suitable for switches, routers and servers in data centers, reducing power and cost compared with active optics while simplifying rack-level cabling.

## Long description

The BlueOptics Direct Attach Copper (DAC) Cable CBO Q28-4S28-DAC-3M-BC-BL is a 3 m QSFP28 passive copper cable designed for short-reach 100 Gigabit Ethernet interconnects. This fixed-link assembly provides a direct electrical connection between QSFP28 ports on switches, routers and servers, offering low latency and deterministic performance for rack-to-rack and intra-rack deployments in data centres. The cable is finished in blue sheathing and terminated with QSFP28 plugs to match standard high-density networking equipment.
Advantages
The DAC cable delivers a cost-efficient and power-saving alternative to active optical transceivers for short distances. Its passive construction eliminates the need for separate transceivers and reduces heat generation and power consumption in dense switch environments. The QSFP28 interface supports 100GbE links while maintaining a reliable electrical transmission with minimal signal processing, simplifying installation and reducing the number of field-replaceable components.
Suitable for
High-density switch-to-switch 100GbE connections within racks and between adjacent racks
Server uplinks and top-of-rack (ToR) aggregation in data centres
Short-reach interconnects in storage and compute clusters requiring low latency
Key specifications
Connector type: QSFP28 to QSFP28
Cable length: 3 metres
Data rate: supports 100 Gigabit Ethernet (100GbE)
Cable media: direct attach copper (passive copper assembly)
Colour: blue outer sheath
Typical use: short-reach, rack-level interconnects
How to use
Install by plugging each QSFP28 connector into the corresponding QSFP28 port on your networking equipment. Ensure both ports are powered down or that hot-plug procedures recommended by the equipment vendor are followed. Verify link status through the switch or server management interface after insertion. For best performance, avoid tight bends and strain near the connectors and retain any built-in locking clips to secure the connection.
Usage recommendations
Use this passive QSFP28 DAC cable for short-distance 100GbE links where power efficiency and low latency are priorities. For runs beyond typical rack-to-rack distances or when optical isolation is required, consider optical transceivers and fibre cabling instead.

## FAQ

### How much does the CBO QSFP28 DAC Cable Q28-4S28-DAC-3M-BC-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 06.08.2026 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/4466069/59879699_large.webp