This first needs to understand that USBType-C and USB3.1 are somewhat different. Strictly speaking, USBType-C is part of the USB3.1 standard, but the USBType-C specification is actually defining the connector.  Interface style, by contrast, USB3.1 is a set of transmission standards.  In other words, for consumers, USB Type-C can be regarded as a "shape" of a connector, and this "shape" can embed different transmission standards, such as USB3.1, Thunderbolt3,  Even USB3.0, so a USBType-C with the same appearance may actually have different functions. For example, a USBType-C jack with a transfer standard of Thunderbolt3, if connected to an external hard drive that supports Thunderbolt3, can transfer files at a synchronous speed of 40GB per second.  Since Thunderbolt3 is also backward compatible with USB 3.1, this USBType-C can also be plugged into an external hard drive of USB 3.1, but the speed will drop to 10GB per second (the theoretical rate of USB 3.1).  However, if it is reversed, plugging in an external hard drive of Thunderbolt3 on a USBType-C jack with USB3.1 transmission standard, you will find nothing happened - because the specifications are not supported.

a USBType-C statement Although Thunderbolt3 was released late, as it was not popular with its predecessors, Intel has also noticed this problem - consumers may not know what this USB Type-C is, and the facts  This problem has also occurred. Since many manufacturers are concerned about the convenience of USB Type-C's slim and positive plug, they have adopted the USB connector of their products from the most common USB Type-A style, or  The micro USB-B that will be used on the mobile phone is replaced with a USB Type-C jack, so that the current USB Type-C has three transmission specifications of USB3.1, 3.0 or even 2.0 (the rate is 10GB/s, 5GB/ in order).  s with 480Mbps), not to mention Thunderbolt3 and so on.

Intel's approach to this idea, although effective, has inevitably expanded the problem to some extent - because Intel's method of thinking is to invent various icons to indicate the transmission standard supported by this USBType-C.  For example, if a USBType-C can support Thunderbolt3, it will mark a lightning pattern on the connector. If it supports USB3.1, it will mark "SS" on the connector.

Obviously, USB-IF (a non-profit organization responsible for developing USB standards, but mainly members of the IT giant) hopes to make the USB Type-C interface a global unified hole, even replacing the 3.5mm headphone jack, and if the cost permits,  It is also hoped that the transmission standard for each USB Type-C interface will be Thunderbolt3 - because this standard is not only the most powerful (with a bi-directional synchronization rate of 40GB / s), but also backward compatible.  For the user, if you plug in the USB Type-C and find that the expected function does not happen, in addition to confirming whether the connection is faulty, you have to climb the product specifications again to confirm whether the USB Type-C supports the required functions.  Looking back, what standard does the USB Type-C on the 12-inch MacBook support?  The answer is USB3.0 with a transfer rate of 5GB/s. It is worth mentioning that USB Type-C, which is now installed on mobile phones, still mainly uses USB2.0.

As we all know, Intel has introduced Thunderbolt for many years, and the speed has always maintained the PCI Express protocol. Intel will use the nano-optoelectronic technology and the faster PCI Thunderbolt to continue to lead other high-speed transmission interfaces in terms of transmission speed. In addition, Thunderbolt can  The use of the Daisy-chain serial mode allows consumers to simultaneously handle the characteristics of various tasks such as image transmission, image editing and data transmission. It has also received repercussions from the market. Obviously, in the 5G era of multi-flash convergence, high speed  The transmission interface has become standard.