Patent ID: 7769941

Claim:
An universal serial bus (USB) matrix switch system provided for a plurality of USB devices shared with a plurality of hosts, comprising: a plurality of down physical layer transceivers (DP PHYs), one to one corresponding to the USB devices so as to transfer those series signal received from the USB devices to parallel signals; a plurality of up physical layer transceivers (UP PHYs), one to one corresponding to the hosts; a plurality of hubs, one to one corresponding to the UP PHYs, each the hub having a digital repeater, a transaction translator (TT), an up router, a down router, the down router recorded connection status with the USB devices or disconnection status; a signal fetching monitor for fetching a control signal provided by an user; and a plurality of signal control switch modules, one by one corresponding to the DP PHYs, each signal control switch module comprising: a down stream port controller, a disconnection emulator, provided for simulating a disconnection status while the down stream port controller receives no signal, and a select multiplexer (MUX) provided for a selected USB devices switched to a selected hub of the hubs in accordance with the control signal.