Before talking about USB 3.1, let’s take a look at USB.
The full name of USB is Universal Serial Bus. The USB specification used around the world was developed by the USB Implementers Forum USB (USB-IF) developer forum. The first official version, USB 1.0, was launched in January 1996. At present, the common USB versions on the market are divided into two standards: 2.0 and 3.0; and the USB Alliance also announced the latest USB 3.1 specification at the end of 2013. Some USB 3.1 trademarks will be written as SuperSpeed +, and its full name is “SuperSpeed USB 10 Gbps”.
The USB 3.1 specification features:
- The power supply can be up to 100W, and the voltage and current will increase.
- In addition to supporting the original Type-A and Type-B interfaces, it adds a Type-C interface.
- To reduce encoding loss, from 20% of the previous generation USB 3.0 to 3%, and change the encoding method to 128b / 132b.
- The transmission speed can reach 10Gb / s, which is twice as fast as USB 3.0, and is backward compatible with USB 2.0 / 1.0
- Added USB A / V audio and video transmission function, which can provide 9.8Gbps bandwidth, and support up to 4K picture quality / 30FPS screen output.
Simply put, USB 3.1 improves the power transmission specification, reduces power consumption, is faster, and supports the new Type-C connector.
The bandwidth and transfer speed of each generation of USB specifications have improved. Compared with the first generation of USB 1.0, the latest USB 3.1 has a bandwidth increase of 6,826 times and a transfer speed of 5,333 times! It takes 9.25 hours to transfer a 25GB HD movie using USB 1.0. Transfer in USB 3.1 takes only 35 seconds.
Next news: What is USB Type-C?