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What is MCIO Cable? Aug 14, 2025

The MCIO cable is a connection cable based on the MCIO (Mini Cool Edge IO) interface. MCIO is a high-density, low-height, high-speed connector system that complies with the SFF-TA-1016 standard. The following is a detailed introduction to the MCIO Cable:

【Features】High-speed transmission The MCIO cable supports high-speed signal transmission and can support high-performance links such as PCIe 5.0/6.0, CXL, and UCIe. The single-channel signal transmission rate can reach up to 56 GT/s NRZ and 112 GT/s PAM-4, which can meet the interconnection requirements of next-generation servers and data centers for high bandwidth and low latency.

Compact design: The MCIO interface features a 0.6mm pin pitch and adopts a compact design. It optimizes system space while supporting high-performance data transmission, making it suitable for designs that require high-speed signal routing and management within limited Spaces.

Excellent signal integrity: The MCIO cable can maintain stable signal quality even in long signal paths, reducing signal loss and interference. Its cable design can provide an ideal long-distance high-data-rate signal transmission solution.

Strong compatibility: MCIO cables are typically designed to be backward compatible. For instance, MCIO cables that support PCIe 5.0 can also be seamlessly compatible with older versions of PCIe (4.0, 3.0, 2.0, 1.0), achieving a smooth transition between new and old technologies.

Flexible configuration: The connectors of the MCIO cable offer different configurations of plugs such as right-angle, right side exit, and left side exit, which can be matched with right-angle and vertical on-board connectors, enhancing design flexibility. At the same time, there are multiple pin configurations, such as 38-pin and 74pin, to meet the requirements of different numbers of signal channels.

 

【Performance parameters】Electrical performance The working voltage of the MCIO cable is generally 30VAC per contact, the current is 0.5A per contact, the initial maximum contact resistance is 20mohm, the maximum change after stress testing is 20mohm, and the minimum dielectric withstand voltage is 300VDC for 100ms. The minimum insulation resistance between adjacent pins is 10MΩ.

Mechanical performance: The insertion and extraction force of the MCIO cable has certain limitations. The maximum mating force is 55.5N, and the maximum unmating force is 49N. The minimum rated durable cycle number is 250 times.

 

【Application】MCIO cables, with their features such as high-speed transmission and high-density connection, have been widely applied in multiple industries including data centers, artificial intelligence, and storage

Data center industry: In data centers, MCIO cables can be used for direct connection of PCIe 5.0 SSDS, replacing traditional SAS/SAS expansion cards and reducing data transmission latency. For instance, some large cloud computing data centers, when upgrading their storage systems, adopt MCIO cables to connect the motherboards and SSD backboards, achieving faster data read and write speeds and enhancing the response efficiency of cloud services. Meanwhile, the MCIO cable can also provide high-bandwidth inter-board connections for AI training nodes, supporting multi-card collaborative computing. For instance, some of NVIDIA's data censary-level GPU servers adopt the MCIO cable to achieve high-speed interconnection between Gpus, accelerating the training process of AI models.

In the artificial intelligence industry: In AI servers, MCIO cables are used to connect cpus with Gpus or dedicated accelerators to ensure high-speed data transmission and low latency. For instance, in some deep learning-based natural language processing and image recognition servers, the CPU and GPU are connected through MCIO cables, which enables rapid processing of large amounts of data during training and inference, thereby enhancing the training speed and recognition accuracy of the model.

Storage industry: c can achieve adapter compatibility solutions, such as MCIO 8X to dual Mini SAS HD (SFF-8643) cables, which can realize the mixed deployment of new and old storage backboards, protecting the enterprise's original storage equipment investment while enhancing the performance of the storage system. Some storage device manufacturers also use MCIO to customize network card modules, supporting 100G Ethernet, which increases the data transmission bandwidth between storage devices and the network.

In the high-performance computing industry: In high-performance computing clusters, MCIO cables are used for direct connections between processors, supporting rapid data exchange and collaborative work, and reducing data transmission bottlenecks. For instance, in high-performance computing systems in fields such as weather forecasting and scientific research, by connecting multiple processors through MCIO cables, large-scale meteorological data, scientific simulation data, etc. can be processed rapidly, thereby enhancing computing efficiency and accuracy.

In the edge computing industry, MCIO cables provide the necessary high-bandwidth connections in edge computing applications, supporting real-time data processing and rapid response. For instance, in the edge computing devices of the intelligent transportation field, the MCIO cable connects processors and sensors such as cameras and radars, capable of processing the collected traffic data in real time, achieving functions like vehicle recognition and traffic flow monitoring, and providing timely and accurate data support for the intelligent transportation system.

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