![]() Here, you can see there is a Device 2 on Bus 1 which is listed as “Intel” and is an Intel Webcam. Remember that the Root Hubs are listed as Device 1. Bus 1 and 2 are USB 2.0 while Bus 3 is a USB 3.0 root hub. USB mass storage devices can be mounted internally and attached to the port.įigure 3 shows a system with three USB hubs. An internal USB port can be used to add external ports or add an internal device. Some systems use the bus on the motherboard and some motherboards literally have a USB port on it. Some internal devices, which may be part of the ports, can include: Three of the buses are USB 2.0 and four are USB 1.1. We can explore this ability later.įigure 2 shows a system with seven USB Buses. If the USB 2.0 Root Hub fails, then the port to which it is connected can still function as a USB 1.x port. NOTE: Be aware that a port can be connected to a USB 1.x and 2.0 Root Hub. Buses 2 to 4 are all USB 1.1 at a speed of 12M. Bus 1 is definitely USB 2.0 since it is listed with the driver EHCI and lists the bus speed as 480M. For example, Bus 1 in Figure 1 shows it has six ports. Be aware that the number of ports may not be external ports. The number following the “/” designates how many ports are located on the device. The driver specifies the Linux driver and designates the USB Standard (OHCI, UHCI, EHCI or xHCI). Root hubs are always Port 1 and devices attached are listed on the following ports, starting at 2, as they are attached. All of these main devices are listed as “root_hubs” on Port 1. Looking at Figure 1, you can see there are four USB buses. The following shows three different systems. To determine your USB type in Linux, go to a Terminal and use the 'lsusb -t' command. 3.0 – eXtensible Host Controller Interface (xHCI).2.0 – Enhanced Host Controller Interface (EHCI).1.x – Universal Host Controller Interface (UHCI).1.x – Open Host Controller Interface (OHCI).Each standard has a specific Interface type as follows: ![]()
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