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USB 根集线器可以有多个物理端口吗？

tag-icon • tag-icon usb lsusb
USB 根集线器可以有多个物理端口吗？

到目前为止，当我使用 Unix 工具检查计算机时，lsusbUSB 根集线器的数量似乎总是与物理端口的数量一样多。但是一个USB Root Hub可以有多个物理端口吗？

答案1

lsusb -t是的，请参阅我的系统上的输出：

/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 480M
    |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 1: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 9: Dev 4, If 0, Class=Hub, Driver=hub/6p, 480M
        |__ Port 5: Dev 6, If 0, Class=Vendor Specific Class, Driver=, 480M
        |__ Port 5: Dev 6, If 1, Class=Vendor Specific Class, Driver=, 480M
    |__ Port 10: Dev 5, If 1, Class=CDC Data, Driver=cdc_acm, 12M
    |__ Port 10: Dev 5, If 0, Class=Communications, Driver=cdc_acm, 12M

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