# Network Cable BlueLAN Cumulus QSFP28-4SFP28-DAC-2M 100GBASE-CR4 2m Blue

**URL:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-2m-cn-bl--10894259
**Data updated:** 2026-03-07 18:09 (EET)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** Q28-4S28-DAC-2M-CN-BL
**EAN:** 4063232122625
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 173.49 €
**Prices and availability valid until:** 2026-08-29 23:59
**Price without VAT (21%):** 143.38 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-q28-4s28-dac-2m-cn-bl--10894259

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.08.2026 | free |
| Pickup points | 01.09.2026 | 1.79 EUR |
| Courier delivery to door | 01.09.2026 | 4.99 EUR |

## Summary description

The BlueLAN Cumulus QSFP28-4SFP28-DAC-2M is a passive direct attach breakout cable designed for high-speed data transmission. It features a QSFP28 connector on one end and four SFP28 connectors on the other, supporting 100GBASE-CR4 to 4x25GBASE-CR standards. With a length of 2 meters and AWG26 wire gauge, it ensures reliable performance and minimal signal loss, making it ideal for data centers and high-performance computing environments.

## Long description

The BlueLAN Cumulus QSFP28-4SFP28-DAC-2M is a passive direct-attach breakout cable engineered for short-reach, high-bandwidth connectivity in network infrastructure. It combines a single QSFP28 plug with four SFP28 plugs to deliver 100GBASE-CR4 to 4x25GBASE-CR operation over a 2 meter twinax assembly. Constructed with AWG26 conductors and designed for low insertion loss and controlled impedance, this cable is intended for interconnecting switches, routers and server ports within racks and across adjacent racks in data center and high-performance computing deployments.
Advantages
The cable provides a compact, low-latency solution for aggregating 25 Gbps lanes into a 100 Gbps QSFP28 interface without active electronics. Passive twinax construction reduces power consumption compared with active optics and simplifies deployment by eliminating separate transceivers. With a 2 m length and AWG26 gauge, it balances flexibility and signal integrity for short-reach links while keeping weight and connector strain low. The breakout arrangement allows direct connection to four SFP28 ports from a single QSFP28 port, streamlining port mapping and cabling density.
Suitable for
 Inter-rack and intra-rack connections between switches and spine/leaf architectures
 Server to top-of-rack switch links requiring 100G to 4×25G breakout
 High-performance computing clusters and storage network aggregation
 Environments where passive, low-power short-reach cabling is preferred
Key specifications
 Connector configuration: QSFP28 to 4 × SFP28
 Supported standards: 100GBASE-CR4 to 4×25GBASE-CR
 Cable type: Passive twinax direct attach cable (DAC)
 Length: 2 meters
 Wire gauge: AWG26
 Typical use case: Short-reach data center interconnects
How to use
Insert the QSFP28 connector into the 100G QSFP28 port and align each of the four SFP28 connectors with their respective 25G SFP28 ports. Ensure connectors are fully seated and retention latches are engaged. Route the cable to avoid sharp bends and excessive tension; maintain the minimum bend radius specified by the equipment manufacturer. No external power or configuration is required for passive operation, but confirm that connected devices support breakout from QSFP28 to SFP28 ports and have compatible lane mapping and firmware settings.
Usage recommendations
Use this cable for short-distance, high-bandwidth links inside racks or between adjacent racks. Verify compatibility with switch and server vendor breakout support and follow ESD handling procedures when plugging or unplugging. Avoid running the cable near high-interference sources and keep cable runs within the recommended 2 m length to maintain signal integrity.

## FAQ

### How much does the Network Cable BlueLAN Cumulus QSFP28-4SFP28-DAC-2M cost, and is it available for purchase?

The price is 173.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 50 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 27.08.2026 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