# DAC cable CBO QSFP28 to 4×SFP28 passive copper 3m

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-3m-it-bl--4466080
**Data updated:** 2026-02-25 16:31 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-3M-IT-BL
**EAN:** 4063232123028
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 192.99 €
**Prices and availability valid until:** 2026-08-04 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-it-bl--4466080

## 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

Passive copper DAC cable from CBO, QSFP28 to 4×SFP28, 3 meters length. Designed for direct server-to-switch and switch-to-switch connections in data centers and network racks where QSFP28 ports need to be split to multiple SFP28 ports. Offers low latency, fixed 3m reach and no external power or transceivers required, simplifying short-reach 25/100GbE connectivity.

## Long description

Passive copper DAC cable CBO QSFP28 to 4×SFP28 3m from BlueOptics provides a fixed-length, low-latency electrical connection for high-speed short-reach links. The assembly converts a single QSFP28 port into four independent SFP28 lanes, enabling 25GbE or 100GbE infrastructure segmentation without active transceivers or external power. With a 3 meter copper direct-attach format, this cable is intended for server-to-switch and switch-to-switch interconnects inside racks and data centers where reliable, low-cost short-distance connectivity is required.
Advantages
The passive DAC design delivers minimal latency and stable signal performance without the need for power or heat-dissipating electronics. Fixed 3 m length simplifies cable management and planning in standard rack deployments. The breakout functionality from QSFP28 to four SFP28 ports allows flexible port utilization and cost-effective migration paths between 25GbE and 100GbE equipment. Being a copper assembly, it removes the need for separate optical transceivers for short links and reduces component count.
Suitable for
 Server-to-switch short-reach connections within a rack or adjacent racks
 Switch-to-switch aggregation links in top-of-rack and middle-of-row deployments
 Migration from 100GbE uplinks to multiple 25GbE endpoints
 Environments where low latency and deterministic electrical links are required
Key specifications
 Connector type: QSFP28 (one end) to 4 × SFP28 (other end)
 Media: Passive copper direct-attach
 Length: 3 meters fixed
 Data rates supported: up to 100GbE aggregated or 25GbE per SFP28 lane
 Latency: minimal passive electrical latency suitable for short-reach applications
 Power: no external power required
 Typical use environment: rack-mounted data centers and network equipment rooms
How to use
Install the DAC by firmly seating the QSFP28 plug into the QSFP28 port of the upstream device and the four SFP28 connectors into the downstream SFP28 ports. Ensure devices are powered down or ports are administratively disabled if recommended by the equipment vendor before insertion. Verify link lights and host interface status after physical connection, then enable or configure the ports in the network equipment as required for the intended VLANs and speeds.
Usage recommendations
Route the cable to avoid sharp bends and maintain manufacturer-recommended bend radius. Use the 3 m fixed length for short intra-rack or adjacent-rack links; for longer distances, consider active copper or optical solutions. Confirm compatibility with switch and server port firmware or vendor compatibility lists to ensure full lane negotiation and expected performance.

## FAQ

### How much does the CBO QSFP28 to 4×SFP28 DAC cable 3m 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/4466080/59857224_large.webp