USB 2 based on the half duplex two-wire bus, can only provide one-way data transmission, while the USB 3 using a dual simplex four wire differential signalline, so support bidirectional parallel data transmission, it is full duplex bus mode, which is the key of USB3.0 transmission rate soared to reason. In addition, USB 3 also introduces new power management mechanism, supportstandby, dormancy and suspended state, so the maximum can also provideabout 900 Ma of power
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