USB 3.1/USB Type-C

　　通用串行總線（USB）是20世紀90年代中期發(fā)展起來的一種標準，用來規(guī)范計算機和外設之間的連接，包括通信和供電。它取代了各種早期的接口，如串行/并行端口，PS / 2，和單獨的便攜式設備電源充電器。

　　有三個連接器尺寸-標準，迷你，和微型，類型“A”，“B”和“AB”連接器和相應的容器，和五個數(shù)據(jù)傳輸模式總結表1：

　　USB 3.1/Gen 2 is essentially USB 3.0 with double the speed， to 10 Gbit/s. It is full duplex and not reversible， so the connector and receptacle has to be aligned in the correct orientation to be inserted. It has a total capacitance of 0.1 ~ 0.5 pF.

　　USB Type-C is 10 Gbit/s and reversible （similar to Apple’s Lightning） with symmetrical 24 pins so the connector will attach to the receptacle on the first try. The additional pins permit support of data protocols such as DisplayPort 1.3， PCI Express， and Base-t Ethernet using Type C cables. Figure 1 shows the pinout diagram of USB Type-C cable.