(1) Fast enough: Speed performance is one of the outstanding features of usb technology. The high transmission rate of the usb interface can reach 12Mb per second, which is 100 times faster than the serial port, and more than ten times faster than the parallel port. The usb TYPE C plug-in now used is up to 5Gb\/S.
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(2) Easy to use: the use of usb interface can connect a number of different devices, and the past serial port and parallel port can only be connected to a device, therefore, from a device to use another device has to shut down, usb saves the user these troubles, in addition to the multiple devices can be connected together in series, usb also supports hot swap. In terms of software, the drivers and application software designed by usb can be automatically started without the user doing more operations.
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(3) Multimedia support: usb provides two channels of data support for the phone. usb supports asynchronous and isochronous data transfers, enabling phones to integrate with PCS, share voice mail and other features. usb also has high fidelity audio, because the usb audio information is generated outside the computer, thus reducing the opportunity for electronic noise to interfere with the sound quality, so that the audio system has a high fidelity.
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(4) Flexible connection: usb socket interface supports serial connection of multiple different devices, and a usb port can theoretically connect 127 usb devices.
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(5) Power supply: Ordinary devices that use serial ports and parallel ports need a separate power supply system, while usb devices do not need it, because the usb interface provides a built-in power supply. usb power supplies can provide 5 volts of power to low-voltage devices, so new devices do not need a specialized AC power supply, thereby reducing the cost of these devices and improving the cost performance ratio.
USB 5-hole socket Generally, a five-hole socket with USB can normally connect to 220 volts, but the USB hole is not good for charging, because its charging speed is relatively slow and the current is unstable