Assmann SuperSpeed USB

　　Assmann SuperSpeed USB

　　USB 3標(biāo)準(zhǔn)（或超速是俗稱）采用了全雙工通信可以大大提高數(shù)據(jù)傳輸速度。以前的USB版本使用了半雙工通信。有超高速USB等諸多優(yōu)點(diǎn)。對(duì)于一，通用串行總線是個(gè)人計(jì)算機(jī)的歷史上最成功的接口，估計(jì)安裝基地10 +十億單位，并在估計(jì)每年增長約3十億單位。這個(gè)新版本的一個(gè)優(yōu)點(diǎn)是高速性能的大幅提高，使信號(hào)速率高達(dá)每秒4.8吉比特；這相當(dāng)于一一零倍的性能比上屆增加USB 2版?？焖賡ync-n-go技術(shù)的一個(gè)例子是從您的家庭服務(wù)器到你的筆記本電腦下載一個(gè)25 GB的高清電影。與USB 2，這將需要大約14分鐘。與USB 3相同的任務(wù)將需要一分鐘多一點(diǎn)。此外，USB 3使用更少的電源比以前的USB版本和向后兼容USB 2。然而，用戶將不會(huì)得到更高的速度的USB 3，除非完整的總線是USB 3。例如，將USB 3打印機(jī)插入到USB 2計(jì)算機(jī)端口會(huì)導(dǎo)致USB數(shù)據(jù)傳輸速率變慢2。

　　由于高清晰度視頻的到來，存儲(chǔ)設(shè)備，高像素的數(shù)碼相機(jī)，便攜式媒體播放器，等等，為更快的數(shù)據(jù)傳輸速率的需求肯定是在我們身上（參見圖8本文的末尾）。除了數(shù)據(jù)傳輸?shù)乃俣群托?，超高速USB作為充電中收取你所有的USB設(shè)備的兩倍以前的USB版本一樣快。超高速USB也利用了以前的USB版本的功率傳輸相同數(shù)量的數(shù)據(jù)分。

　　The latest version of the USB Charging specification – version 1.2， provides the infrastructure to allow USB to charge devices at up to 5 amps （25 watts） per port; previous versions of the specification only allowed up to 500 mA per port. Speculatively， this will lead to the standardization of device charging， which points to the consumer being able to purchase a single device charger to charge multiple devices. Currently， one often needs several different chargers due to the varying electrical requirements of the device. For example， many smartphones utilize a charger that is rated at 1 A at 5 V， while iPads require a charger that is rated at 2.1 A at 5 V. In addition， this new specification allows the USB host and device to communicate with one another in order to determine the device’s optimal charging capability; USB can then choose from three different ports：

　　Standard Downstream Port – charging at 900 mA

　　Charging Downstream Port – charging at 5 A max

　　Dedicated Charging Port – （no data capability） – charging only at 5 A max