Why are there many types of USB Type-C cables and how do I distinguish them?



USB Type-C appears as a USB standard that can be inserted back, and it can charge devices such as laptop PCs, smartphones and tablets, and transfer data. There are actually many types of USB Type-C cables that look the same at first glance, and Google engineer Benson Leon explains the types of USB Type-C cables and how to identify them.

How many kinds of USB-CTM to USB-CTM cables are there? — Benson Leung

USB Type-C replaces the conventional USB Type-A and USB Type-B with a more promising standard, and the insertion port is reversible. It is difficult to insert it, and if you check it carefully, you are upside down. Also, USB Type-C is not only power supply of up to 100W, it can transfer data in alternate mode, and is excellent for being used as a terminal to output video from device to display.

Leon is a person who checks the quality of USB Type-C compatible cables sold by Amazon and publishes a review. In the past, reviewing a bad USB Type-C has destroyed a PC and may have posted a review of anger.

Google engineers from one end of USB Type-C compatible cable to quality review and find out that it works properly-GIGAZINE

Google engineers are serializing Amazon reviews of anger about the current situation that is likely to flood the fearful Type-C USB cable that destroys the PC-GIGAZINE

According to Leon, at the time of writing, the following six USB Type-C cables are roughly divided.

◆ 1: USB 2.0 correspondence and 3A correspondence (data transfer speed 480Mbps)
◆ 2: USB 2.0 correspondence and 5A correspondence (data transfer speed 480Mbps)
◆ 3: USB 3.2 Gen 1 compatible and 3 A compatible (data transfer speed 5 Gbps)
◆ 4: USB 3.2 Gen 1 compatible and 5 A compatible (data transfer speed 5 Gbps)
◆ 5: USB 3.2 Gen 2 compatible and 3 A compatible (data transfer speed 10 Gbps)
◆ 6: USB 3.2 Gen 2 compatible and 5 A compatible (data transfer speed 10 Gbps)

The above six types are basic USB Type-C types, and the rated current is '3 A' or '5 A', and the data transfer speed is '480 Mbps (USB 2.0)' '5 Gbps (USB 3.2 Gen 1)' ' It can be divided by one of 10 Gbps (USB 3.2 Gen 2). More specifically, USB 3.2 compatible cables are faster than USB 2.0 compatible cables, so internal connection wires are increased.



Basically, when using only for charging, the data transfer rate of USB Type-C is not so important. However, if you want to output the screen to another display using USB Type-C with the Chromebook's flagship model ' Pixelbook ', etc., USB Type 2.0 compatible with low data transfer speed or USB Type- compatible with USB 3.2 Gen 1 If you use the C cable, you may fall into a situation where you can not output video even though you are using the USB Type-C cable properly.

The reason why the type of USB Type-C cable has become complicated in this way is that USB Type-C has emerged as a standard with high extensibility at the same time as replacing USB in the past. Even if the shape of the insertion port is the same, there are some that the function has been expanded by changing the internal structure and some that do not, and it is not possible to distinguish each cable by appearance. However, by obliging all USB Type-C cables to have a data transfer rate of 10 Gbps or higher, users who are almost exclusively used for charging applications will also be able to buy expensive USB 3.2 Gen 2 compatible USB Type-C cables. It becomes. Therefore, it is not realistic to raise the lower limit of the data transfer rate.

Then, as for how I should distinguish the USB Type-C cable with multiple users by appearance, Leon points out that the logo near the insertion port of the cable is important. The non-profit USB-IF, which promotes the use of USB, is obliged to attach a different shape logo to each function of the USB Type-C cable, and the cables are USB 2.0, USB 3.2 Gen 1, USB 3.2 Gen 2 Mr. Leon has put together that it is possible to determine which is supported.

in Hardware, Posted by log1h_ik