# InfiniBand/fibre optic cable BlueOptics 720-128728-BL — 1 m, QSFP-DD to 2×QSFP56, male/male, black

**URL:** https://aio.lv/en/product--blueoptics-720-128728-bl--12242592
**Data updated:** 2026-04-01 09:49 (EEST)
**Category:** Network Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** 720-128728-BL
**EAN:** 4063232315294
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 163.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 135.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-720-128728-bl--12242592

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.99 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

BlueOptics 720-128728-BL is a 1 m InfiniBand/fibre optic cable with a QSFP-DD plug on one end and two QSFP56 plugs on the other (male-to-male). Designed for high-speed data interconnects and adapter breakout in data centers and HPC environments, it offers compact QSFP form-factor connectivity in a black 1 m assembly weighing 0.35 kg.

## Long description

BlueOptics 720-128728-BL is a 1 m InfiniBand/fibre optic direct attach assembly with a QSFP-DD plug on one end and two QSFP56 plugs on the other. The cable provides a compact black 1 m interconnect for high-density racks and adjacent-rack links, supporting high-speed electrical transmission for adapter breakout and aggregation in data center and high-performance computing environments. The assembly is designed as a passive direct attach solution in QSFP form factors and weighs approximately 0.35 kg.
Advantages
The cable supports high-bandwidth links while preserving a small physical footprint, enabling direct QSFP-DD to dual QSFP56 breakout without active optics. As a passive direct attach solution it offers low power consumption and low latency for short-reach connections, and it is compatible with platforms that accept this form factor and signaling. The single-meter length simplifies rack-to-rack or intra-rack connections and reduces excess cable management requirements.
Suitable for
Adapter breakout from QSFP-DD to two QSFP56 ports in switches and adapters
Short-range rack or adjacent-rack interconnects in data centers and server rooms
High-performance computing clusters requiring compact, high-bandwidth links
Environments using Ethernet, FCoE, Fibre Channel or InfiniBand signaling over short distances
Key specifications
Cable length: 1 m
Connector A: QSFP-DD (male)
Connector B: 2 × QSFP56 (male)
Supported aggregate bandwidth: up to 400 Gbit/s (as 400GBase-CR8 / 2×200GBASE-CR4 compatible configurations)
Cable type: passive direct attach twinax copper assembly suitable for short-range electrical transmission
Wire gauge: 26 AWG (typical twinax construction)
Colour: Black
Weight: ~0.35 kg
How to use
Connect the QSFP-DD plug to the corresponding QSFP-DD port on the host device and insert the two QSFP56 plugs into the target QSFP56 ports on the switch, adapter or other equipment, observing connector alignment and port labeling. Ensure the connected devices support passive direct attach twinax connections and the intended signaling (for example 400GBase-CR8 or 2×200GBASE-CR4) before applying traffic. Route the cable to avoid sharp bends and compressive stress; maintain recommended bend radius for twinax assemblies and secure the cable to minimize strain on connectors during operation.
Usage recommendations
Use this 1 m passive QSFP-DD to 2×QSFP56 assembly for short-range, high-bandwidth links where low latency and low power are priorities. Verify equipment compatibility and firmware requirements with the hardware vendor and perform a functional test after installation to confirm link integrity and expected throughput.

## Specifications

| Feature | Value |
|---|---|
| Data transfer rate | 400 Gbit/s |
| InfiniBand protocol | Yes |

### Features

| Feature | Value |
|---|---|
| Cable length | 1 m |
| Connector 1 | QSFP-DD |
| Connector 2 | 2xQSFP56 |
| Product colour | Black |
| AWG wire size | 26 |
| Cable shape | Round |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.35 kg |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | 0 - 70 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 360 g |

### Logistics data

| Feature | Value |
|---|---|
| Warranty period | 5 year(s) |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | RoHS, Federal Communications Commission (FCC), CE |

## FAQ

### How much does the BlueOptics InfiniBand QSFP-DD to 2×QSFP56 1 m cable cost, and is it available for purchase?

The price is 163.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 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 15.07.2026 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: cable length, connector 1, connector 2, weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/12242592/68143192_large.webp