In the office environment the USB devices attached to different hosts can be shared among hosts through the local area network. With USB transaction relay technique, all the frequently used USB devices can be grouped together as some sort of virtual USB server. The USB devices in this virtual server can be accessed by any office member using the USB client. A virtual USB host driver under Windows OS is implemented to enumerate the virtual USB devices from the client side. The enumerated virtual device will mimic the real counterpart and the original device driver can be applied without any modification. Theoretically almost all the USB devices without strict timing requirements can be shared with this USB device sharing system. To release the inconvenience of exclusive access properties caused by the nature of the USB protocol, certain management functions are introduced.
File sharing among heterogeneous systems is always a pain due to different conventions and file sharing mechanisms involved in both ends. Although the evolving of USB standards and the spread of USB storage devices alleviate the heterogeneous file sharing effort, the performance of the file transferring is degraded due to the bandwidth reduction introduced by the storage technologies and the fact that the amount of data must be transferred twice, i.e., to and from the storage. We propose a file-system emulation based scheme to transfer files across heterogeneous systems easy and fast. It takes the advantage of standard USB storage protocol to achieve driver-less translation layer for the target system. The overall transfer speed is improved by utilizing the file cache of the source system. The actual amount of data is transferred once without temporarily keeping a copy in the intermediate medium. We also mention example applications such as an UPnP file-server adapter and an improvedfile-sharing cable.
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