QSFP-DD (Quad Small Form-factor Pluggable Double Density) is a new generation of high-speed optical communication module interface standard. QSFP-DD 400G To QSFP56 2 x 200G high-speed cable is a passive direct-attach copper cable (DAC) that supports high-speed data transmission solutions from a 400G port to two 200G ports.
QSFP-DD 400G Cable Features
- High bandwidth support: This high-speed cable uses a QSFP-DD interface, providing 400G speed on one end, and is converted into 2 QSFP56 interfaces on the other end through branching, each supporting 200G speed.
- Low power consumption: Passive direct-attached copper cable (DAC) consumes less power than active optical cable (AOC) or optical module solutions, which can reduce energy consumption in data centers.
- Low latency: DAC cables have extremely low transmission latency and are suitable for latency-sensitive applications such as AI training and data center interconnection.
- High reliability: Made of high-quality materials, it has excellent signal integrity and electromagnetic compatibility to ensure the stability of high-speed data transmission.
- Plug and play: Supports hot-swap, no additional power supply required, and easy deployment.
Applicable scenarios
This cable is widely used in 400G data centers, cloud computing, high-performance computing (HPC), and artificial intelligence (AI) training environments. In the application of school intelligent computing centers, this product can be used to connect core switches and AI training servers to achieve high-bandwidth, low-latency data exchange.
Equipment Device port overview and adaptability analysis
In order to achieve high-speed interconnection between Huawei switch interface card CE98-D8DQ and SVA Wuzhou S900K3 training server, we need to analyze the port characteristics of the two devices and ensure the adaptability of QSFP-DD 400G To QSFP56 2 x 200G high-speed cable.
Huawei interface card CE98-D8DQ port situation
Huawei interface card CE98-D8DQ is a core switch for data center and high-performance computing (HPC) applications, with high-density 400G ports and strong forwarding capabilities.
Port type:
- 8 400GE QSFP-DD packaged optical interfaces
- Support 400G, 200G, 100G rate splitting
Optical module compatibility:
- Compatible with QSFP-DD 400G optical module
- Compatible with QSFP-DD direct-attached copper cable (DAC)
- Compatible with QSFP-DD to QSFP56 2x200G DAC solution
S900K3 training server port situation
S900K3 is a server designed for AI training, usually equipped with high-performance GPU or AI dedicated acceleration card, and supports high-speed network interconnection.
Port type:
- 8 * 200GE QSFP56 interface direct output, RoCE protocol
- Can be interconnected with the switch through DAC or AOC solution
Optical module compatibility:
- Compatible with QSFP56 200G optical module
- Compatible with QSFP56 DAC cable
- Applicable to QSFP-DD to QSFP56 2x200G DAC solution
Connection solution and application advantages
In the AI training environment of the school’s intelligent computing center, server clusters usually need to be connected to high-speed switches to achieve efficient data interaction. This solution uses 400G QSFP cable (QSFP-DD 400G To QSFP56 2 x 200G high speed cables) to connect Huawei CE9860-4C-EI-A switches to S900K3 training servers.
Connection method
On Huawei CE9860-4C-EI-A, select the QSFP-DD 400G port and use the QSFP-DD 400G To QSFP56 2 x 200G DAC cable for splitting.
The two QSFP56 200G interfaces of the cable are connected to the QSFP56 200G ports of the S900K3 training server to achieve high-bandwidth interconnection.
