Being the most convenient and universal interface, USB is inseparable from everyday use by many people, including mobile phones and computers.However, the official USB changed the naming system in the USB 3.X era and created a lot of USB 3.0 / 3.1 / 3.2 The naming of Gen1 or Gen2 is simply anti-human design, which makes people unable to understand the specific speed.
Maybe it was too much to complain and the official USB-IF organization finally woke up a little and started fixing it in the USB4 era.In the past two days, the previous naming method has been completely eliminated, the USB + number naming method has been canceled, and the USB + speed method has been changed to allow users to identify the USB standard more accurately and charging power has been added to the certification standard.
This change is mainly applicable to the USB 3.X and USB 4.X specifications. The previous USB 1.0 and USB 2.0 standards have not changed. After all, their speeds are all within Gbps. Viewing in Mbps Is Too Easy to Cause New Misunderstandings After all, many network users can only understand the size of numbers.
The specific changes are as follows:
USB 3.0 / USB 3.1 Gen 1 （SuperSpeed）> USB 3.2 Gen 1×1 5 Gbps> USB 5 Gbps
USB 3.1 Gen 2 (SuperSpeed USB +)> USB 3.2 Gen 2×1 10 Gbps> USB 10 Gbps
USB 3.2 Gen 2×2 20 Gbps> USB 20 Gbps
USB4> USB 40 Gbps
This time around, the four speed standards of USB 5 Gbps, USB 10 Gbps, USB 20 Gbps and USB 40 Gbps have replaced the previous USB 3.X and USB 4.X. The USB4 2.0 announced not long ago has a maximum speed of 80 Gbps and the future is expected to become the USB standard 80 Gbps.
In addition to the speed standards, the USB certification also has power standards, so there will be three certification specifications in the future, as follows:
This is the specific performance level of the USB standard.
This is a USB charger that complies with the USB certification standard.The charging capacity is 100W and 240W. The standard requirements are very high.
This is the certification standard for USB-C cables, the speed is between 5Gbps and 40Gbps, and the charging is 60W or 240W. The standards required are also very high.
In general, the new naming is not only clearer and easier to understand, but also adds the power capacity logo,The upper and lower limits of the certification standards are very high, up to 40 Gbps, 240 W,If these two standards can be popularized in the future, the USB interface and the cable will be truly omnipotent.
