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1, easy to use, Use USB interface to connect a number of different devices, and a serial port and parallel port of the past can only pick one device, as a result, from one device to another device to shut down, removed the, install the, boot used again, the USB is for the user to save the trouble, in addition to the concatenated together multiple device, USB support hot plug. In the aspect of software, the design of USB driver and application software can be started automatically, without the user having to do more operations, it also brings great convenience for the user. USB device or IRQ conflicts. USB port to use their own reserves alone, no contention PC with other equipment limited resources, also for the user to save the trouble of hardware configuration. Fast enough to 2, Speed performance is one of the prominent characteristics of USB technology. USB interface the highest rate of up to 12 MB per second, 100 times faster than a serial port for, more than 10 times faster than parallel port also. 3, flexible connection USB interface support multiple different equipment serial connection, can connect a USB port theory 127 USB devices. Connection way is flexible, can use the serial connection, you can also use the central connector (Hub), connect multiple devices together, with the USB port of your PC. In USB mode, all of the peripherals outside the casing connection, connected peripherals don't have to open the case; Allow peripherals hotplug, without having to shut down the host power supply. USB USES a "cascade" approach, that is, each USB device with a USB peripherals plug connected to a USB socket, and its itself provide a USB socket for the connection with a USB peripherals. Similar to the Daisy chain connection, a USB controller can connect as many as 127 peripherals, and each peripheral distance between up to 5 m (cable length). USB can intelligent identification USB peripheral devices in the chain of insert or dismantle, USB for PC peripherals expansion provides a good solution. 4, independent power supply Common use a serial port, parallel port devices require a separate power supply system, and the USB device is not required, because the USB interface provides a built-in power supply. USB power supply can provide low-pressure equipment 5 v power supply, so the new equipment do not need special ac power, thus reducing the cost of the equipment and improve the cost performance. 5, support multimedia USB provides a two way data support for the phone. USB can support asynchronous and isochronous data transmission, so that the phone and PC integration, sharing the voice mail and other features. USB but also has high fidelity audio. Because the USB audio information generated in the computer, thus reducing the chance of a electronic noise sound quality, making audio system has higher fidelity. |
