Patent ID: 7188206
Filing Date: 2007-03-06
Classification: G06F

Abstract:
1. A Universal Serial Bus (USB) system comprising: a group of USB hubs, comprising at least one USB hub, wherein each USB hub comprises: wherein the group of USB hubs is installed in the same layer in the USB system, and the group of USB hubs comprises a first number of downstream ports in total; a USB compound device comprising: wherein among the first number of downstream ports of the group of USB hubs, there are a third number of downstream ports prior to the first downstream port, in which the third number is not less than the second number minus one; and a fourth number of USB dummy devices connecting to a fourth number of downstream ports among the first number of downstream ports of the group of USB hubs, in which the fourth number of downstream ports are subsequent to the first downstream port, wherein each USB dummy device is capable of providing a connection event to a USB hub when connecting to a downstream port of the USB hub, in which the fourth number is the second number minus one.