# Direct Attach Cable BlueOptics R8M46A-BL QSFP-DD 400GBASE-CR4 Ethernet 26 AWG 2m

**URL:** https://aio.lv/en/product--blueoptics-r8m46a-bl--12266982
**Data updated:** 2026-04-14 22:37 (EEST)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** R8M46A-BL
**EAN:** 4063232351094
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 260.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 215.69 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-r8m46a-bl--12266982

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

BlueOptics R8M46A-BL is a QSFP-DD Direct Attach Copper (DAC) cable for 400GBASE-CR4 Ethernet links. Built with 26 AWG conductors and a 2 meter length, it provides a low-latency, high-bandwidth copper connection for switches, routers and servers supporting QSFP-DD ports. Suitable for short-reach data center interconnects and high-speed aggregation links.

## Long description

BlueOptics R8M46A-BL is a QSFP-DD Direct Attach Copper (DAC) cable designed for 400GBASE-CR4 Ethernet links. With 26 AWG conductors and a 2 meter length, this cable provides a passive copper connection between QSFP-DD ports on switches, routers and servers. The assembly supports low-latency, high-bandwidth short-reach connections typically used in data center aggregation, top-of-rack interconnects and high-speed server links.
Advantages
The cable offers a cost-effective, low-power solution compared with optical transceivers for short distances, eliminating the need for separate transceivers at each end. Its QSFP-DD form factor ensures compatibility with devices that accept QSFP-DD direct-attach copper assemblies, and the 26 AWG conductor construction balances signal integrity and flexibility. The fixed 2 m length simplifies rack layout planning while maintaining consistent electrical performance for 400GBASE-CR4 links.
Suitable for
Short-reach data center connections between QSFP-DD ports
Top-of-rack aggregation and spine-to-leaf links
High-density server-to-switch or switch-to-switch interconnects
Environments where low latency and minimal power consumption are priorities
When it may not be suitable
This passive copper DAC is intended for short-distance links and is not suitable for long-haul or campus-wide connectivity where optical fiber is required. It also requires both devices to support QSFP-DD direct-attach copper assemblies; it will not function with devices that do not accept QSFP-DD copper modules or that require active optical transceivers.
Key specifications
Interface: QSFP-DD to QSFP-DD
Standard supported: 400GBASE-CR4
Conductor gauge: 26 AWG
Length: 2 meters
Cable type: Passive direct attach copper (DAC)
Use case: Short-reach, high-bandwidth copper link
How to use
Insert each QSFP-DD connector into the corresponding port until the latch engages, ensuring the connector orientation matches the port. Verify that both ends are fully seated and that connected devices are configured for 400GBASE-CR4 operation. Because the cable is passive, no external power or configuration is required for the cable itself. Monitor link status and error counters on the connected equipment after installation to confirm proper operation.
What to consider before purchase
Confirm both devices accept QSFP-DD direct-attach copper connections.
Verify 400GBASE-CR4 support and required lane configuration on switches or servers.
Evaluate rack distance to ensure 2 m length is appropriate for cable routing without strain.
Check thermal and airflow constraints in high-density deployments, as copper DACs can affect rack airflow differently from optical modules.
Usage recommendations
Route the cable to avoid sharp bends and mechanical strain; maintain the manufacturer’s minimum bend radius. Use proper cable management in high-density racks and avoid excessive stacking of connectors. Periodically inspect connectors for debris and ensure firm seating to maintain reliable 400G links.

## FAQ

### How much does the BlueOptics R8M46A-BL QSFP-DD 400G DAC 2m cost, and is it available for purchase?

The price is 260.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 19 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 27.07.2026 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