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Introduction to the USB1 standard interface

USB1 standard interface transmission rate is 12Mbps, but a USB device can only get a transmission bandwidth of up to 6Mbps. Therefore, if you want to connect an external optical drive, you can connect to a six-speed optical drive at most, no higher. If you want to play MPEG-1 VCD instantly. The video, at least 5Mbps transmission bandwidth, this USB can get, but to complete the MPEG-2 DVD movie playback four times the amount of data, USB may be very difficult, if coupled with AC-3 audio data, USB devices are hard to achieve instant playback.
A USB interface can theoretically support 127 devices, but this number is not yet available. In fact, for a computer, there are rarely more than 10 peripherals connected, so this number is enough for us to use.
Another significant advantage of USB is that it supports hot swapping. In other words, you can safely connect or disconnect USB devices when booting up, to achieve true plug and play.

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