# DAC cable CBO Q28-4S28-DAC-3M QSFP28 to 4× SFP28 direct-attach copper, 3 m

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-cn-bl--4466071
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-CN-BL
**EAN:** 4063232122960
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 171.49 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 141.73 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-cn-bl--4466071

## 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

Direct-attach copper (DAC) cable CBO Q28-4S28-DAC-3M provides a 3-meter connection between one QSFP28 port and four SFP28 ports. It supports high-speed short-reach interconnects in data centers and telecom racks for 25GbE/100GbE equipment, enabling low-latency, low-power links between switches, servers, and storage with a compact, pre-terminated design.

## Long description

Direct-attach copper (DAC) cable CBO Q28-4S28-DAC-3M QSFP28 to 4× SFP28 direct-attach copper, 3 m provides a pre-terminated, fixed-length copper connection that links one QSFP28 port to four SFP28 ports over a 3-meter distance. Designed for short-reach, high-bandwidth interconnects in data centers and telecom racks, the cable supports 25GbE/100GbE equipment and enables aggregation or breakout of a 100GbE QSFP28 port into four 25GbE SFP28 channels. The compact form factor and integrated connectors simplify installation and reduce cabling complexity in switch-to-server, switch-to-switch, or switch-to-storage topologies.
Advantages
This DAC cable delivers low latency and low power consumption compared with active optical or active copper solutions, while offering a cost-effective option for high-density rack connectivity. Its pre-terminated construction eliminates on-site termination and ensures consistent electrical performance across all four SFP28 lanes. The direct-attach design provides reliable mechanical alignment and reduces cable management overhead in crowded rack environments.
Suitable for
Breakout of a 100GbE QSFP28 port into four independent 25GbE SFP28 links
Short-reach server-to-switch or switch-to-switch connections within data center racks
High-density top-of-rack or end-of-row interconnects where low latency is required
Environments seeking a low-power, cost-efficient alternative to active optical cables
Key specifications
Connector type: one QSFP28 plug to four SFP28 plugs
Length: 3 meters
Media: direct-attach copper (passive copper cable)
Supported data rates: compatible with 25GbE per lane and 100GbE aggregated operation
Usage: short-reach interconnect for top-of-rack and in-rack cabling
Form factor: pre-terminated, fixed-length breakout cable
How to use
Insert the QSFP28 end into the 100GbE QSFP28 port and plug each SFP28 connector into the corresponding 25GbE SFP28 ports. Ensure devices are powered down or that hot-plugging is supported by your equipment before insertion or removal to avoid link disruption. Verify port negotiation and speed settings on connected switches or servers; some platforms may require enabling breakout mode or specific firmware settings to recognize the 4×25GbE lanes. Route the cable to minimize strain and avoid sharp bends, keeping the cable within recommended bend radii for copper assemblies.
Usage recommendations
Use this cable for short-distance connections within the same rack or adjacent racks. For longer spans or where electrical interference is a concern, consider active optical alternatives. Check device compatibility and firmware requirements for QSFP28-to-4×SFP28 breakout functionality before deployment.

## FAQ

### How much does the CBO Q28-4S28-DAC-3M QSFP28 to SFP28 DAC cable cost, and is it available for purchase?

The price is 171.49 € (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

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