USB 3.1 and USB 3.0
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USB 3.1 and USB 3.0
The USB 3.1 standard was released in July 2013, and the maximum theoretical bandwidth was doubled compared to USB 3.0, reaching 10 Gb / s (super speed). The USB3.1 encoding method was changed from 8b / 10b to 128b / 132b in USB3.0, and the bandwidth loss rate dropped from 20% to 3%. After conversion, the bandwidth will exceed 1.2GB / s. This means actual use. The limited transfer speed of USB 3.1 is expected to be close to 1GB / s.
USB 3.1 brings higher transfer speeds and fixes all existing problems. New Type-C interface introduced with USB 3.1. Like Apple's Lightning interface, the Type-C interface eliminates the previous foolproof protection design and can be inserted and used without distinction between positive and negative, eliminating the need to identify the insertion direction.
Another big selling point of USB 3.1 Type-C is the enhancement of the charging function of mobile devices. The maximum allowable power supply standard under USB 3.1 interface is greatly increased to 20V / 5A (Type-A / B only), which can provide power output capability of up to 100W. The highest level of Type-C is 12V / 3A, and 36W charge capacity is enough for some thin and light notebooks. This is also an important reason that New MacBook gave up MagSafe and dared to adopt Type-C as the charging interface.
Functionally, USB 3.1 Type-C also introduces a new alternative mode. In other words, the Type-C interface and data line can transmit non-USB data signals. Currently, Alt mode can support DisplayPort 1.3 and MHL 3.2 specifications, but USB-IF also requires support for other functional standards. In addition to the video interface, other interfaces such as Ethernet can also be supported by Type-C.