# Twinax Direct Attach Cable BlueOptics ET6402-DAC-50CM 40GBASE-CR4 0.5 m

**URL:** https://aio.lv/en/product--blueoptics-et6402-dac-50cm-bl--5039525
**Data updated:** 2026-03-07 15:12 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** BlueOptics
**Manufacturer code:** ET6402-DAC-50CM-BL
**EAN:** 4063232256054
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 71.99 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 59.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-et6402-dac-50cm-bl--5039525

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

Direct Attach Cable (DAC) BlueOptics ET6402-DAC-50CM is a 0.5 meter twinax copper cable designed for 40GBASE-CR4 connections. It provides a fixed, low-latency 40 Gigabit link for short-reach interconnects between switches, routers and servers. The cable suits rack-to-rack and intra-rack high-speed networking where optical transceivers are not required.

## Long description

BlueOptics ET6402-DAC-50CM is a twinax direct attach cable engineered for 40GBASE-CR4 links. At 0.5 m length, this copper DAC provides a fixed 40 Gigabit full-rate connection with low latency and deterministic performance for short-reach interconnects. The cable is intended for direct electrical connection between compatible QSFP+ ports on switches, routers and servers without requiring separate optical transceivers, making it suitable for rack-to-rack and intra-rack high-speed networking in data centers and equipment closets.
Advantages
This direct attach cable offers a cost-effective and energy-efficient alternative to active optical solutions for short distances. Its passive twinax construction delivers minimal latency and predictable signal integrity for high-density deployments. The 0.5 m length reduces excess cable slack in dense racks and helps maintain tidy cable management while supporting the full 40GBASE-CR4 throughput required for high-bandwidth server and switch links.
Suitable for
 Short-reach 40 Gigabit links between switches
 Server-to-switch connections within racks
 High-density rack-to-rack interconnects in data centers
 Environments where optical transceivers are not required
Key specifications
 Interface: QSFP+ to QSFP+ compatible twinax
 Nominal data rate: 40 Gbps (4×10 G lanes)
 Cable type: Twinax copper direct attach (passive)
 Length: 0.5 m
 Use case: Short-reach electrical interconnect for 40GBASE-CR4
 Latency: Low, fixed electrical path
How to use
Ensure both devices have compatible QSFP+ ports that support 40GBASE-CR4 electrical DACs. Power down or follow hot-plug guidance from the equipment vendor if required, then insert each QSFP+ connector into the corresponding port until it latches. Verify link status and negotiate 40 Gbps operation via the switch or server management interface. For reshuffling or relocation, remove by releasing the connector latch and pulling straight out to avoid damaging the port.
Usage recommendations
Route the cable with gentle bends and avoid tight loops; maintain bend radii recommended by equipment vendors. Use in short-reach applications up to the specified 0.5 m length and match with network equipment known to support passive 40G twinax DACs for reliable operation.

## FAQ

### How much does the BlueOptics ET6402-DAC-50CM 40GBASE-CR4 DAC 0.5 m cost, and is it available for purchase?

The price is 71.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 118 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 23.07.2026 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