| 摘要 |
A USB transmission system includes a transferring device for outputting connecting packet when the transferring device is electrically connected to a USB storage device for storing data in a first USB specification, and a server for receiving the connecting packet and accordingly outputting a request packet to the transferring device. The transferring device receives the request packet and accordingly outputs a first response packet in indicative of a second USB specification to the server. The first response packet indicates a device descriptor, and a configuration descriptor, of which the USB version defined in the device descriptor is set as the second USB specification, and the maximum packet size defined in the configuration descriptor is set as the speed of the second USB specification. The first USB specification complies with USB 1.1 specification, while the second USB specification complies with USB 2.0 specification.
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