# BlueOptics QSFP-DD Direct Attach Cable R8M45A-BL 400GBASE-CR4 26 AWG 1 m

**URL:** https://aio.lv/en/product--blueoptics-r8m45a-bl--12266981
**Data updated:** 2026-04-14 22:37 (EEST)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** R8M45A-BL
**EAN:** 4063232351292
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 222.49 €
**Prices and availability valid until:** 2026-08-25 23:59
**Price without VAT (21%):** 183.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-r8m45a-bl--12266981

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 24.08.2026 | free |
| Pickup points | 27.08.2026 | 1.79 EUR |
| Courier delivery to door | 27.08.2026 | 4.99 EUR |

## Summary description

BlueOptics R8M45A-BL is a QSFP-DD direct attach copper cable designed for 400GBASE-CR4 connectivity. Constructed with 26 AWG conductors and a 1 m length, it supports high-speed Infiniband and Ethernet links for short-reach interconnects between switches, servers and routers. Suitable for data centre uplinks, aggregation and server top-of-rack connections.

## Long description

BlueOptics QSFP-DD Direct Attach Cable R8M45A-BL 400GBASE-CR4 26 AWG 1 m is a copper twinax assembly for short-reach 400 Gigabit links. The cable uses a QSFP-DD connector form factor and supports 400GBASE-CR4 signaling over 26 AWG conductors in a 1 metre length. It is designed to interconnect switches, routers and servers within racks and across adjacent racks where high-density, low-latency copper links are preferred over optics for short distances.
Advantages
The QSFP-DD direct attach cable provides a cost-effective, low-power alternative to optical transceivers for 400G short-reach links. Its 26 AWG conductor construction and QSFP-DD form factor ensure compatibility with equipment that accepts direct-attach copper assemblies for 400GBASE-CR4. The fixed 1 m length simplifies cable management in dense rack environments while offering the electrical performance required for aggregation, uplink and server top-of-rack connections.
Suitable for
 Short-reach 400GBASE-CR4 interconnects between switches and routers
 Server to switch top-of-rack connections in data centres
 High-density aggregation and spine-leaf fabrics where copper direct attach is supported
 Environments seeking lower cost and power compared with optical transceivers for in-rack links
When it may not be suitable
This direct attach copper cable is intended for very short reaches; it is not designed for long-distance links or runs between distant racks where optical transceivers and fiber would be required. It also requires host ports that accept QSFP-DD direct attach copper assemblies and may not be compatible with devices that only accept optical modules or different connector types.
Key specifications
 Data rate: 400 Gbps over CR4 lanes
 Connector type: QSFP-DD direct attach copper
 Cable gauge: 26 AWG conductors
 Length: 1 metre
 Supported protocol: 400GBASE-CR4 (Ethernet) and compatible InfiniBand short-reach links
 Typical application: in-rack and adjacent-rack short-reach interconnects
How to use
Insert the QSFP-DD plug into compatible 400G QSFP-DD ports on the two devices to be connected, ensuring each connector is fully seated and the latches engage. No additional configuration is required at the cable level; device port settings or firmware may need to be verified to enable 400GBASE-CR4 operation. Route the 1 m cable to avoid sharp bends and obstructing airflow, keeping it clear of hot components and high-interference power cabling.
What to consider before purchase
 Verify that both devices have QSFP-DD ports that accept direct attach copper assemblies and support 400GBASE-CR4.
 Confirm that a 1 m fixed length meets your rack layout and cable management needs.
 Assess whether copper direct attach is acceptable for your distance and electromagnetic environment versus using fiber optics.
 Check device firmware and vendor compatibility notes for direct attach cables at 400G speeds.
Usage recommendations
Use this 1 m QSFP-DD direct attach cable for short, high-density 400G interconnects where low latency and lower power consumption are priorities. For runs beyond intra-rack or adjacent-rack distances, consider optical fiber solutions.

## FAQ

### How much does the BlueOptics QSFP-DD Direct Attach Cable R8M45A-BL cost, and is it available for purchase?

The price is 222.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 21 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 24.08.2026 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