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The IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2 I/O control is sent by an application to retrieve information about the protocols that are supported by a particular USB port on a hub. The request also retrieves the speed capability of the port.

IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2 is a user-mode I/O control request. This request targets the Universal Serial Bus (USB) hub device (GUID_DEVINTERFACE_USB_HUB). Do not send this request to the root hub.

Input Parameters

AssociatedIrp.SystemBuffer points to a caller-allocated USB_NODE_CONNECTION_INFORMATION_EX_V2 structure.

The Parameters.DeviceIoControl.InputBufferLength member indicates the size, in bytes, of the caller-allocated buffer whose size equals sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2). On input, the caller must set the structure members as follows:

  • The caller must specify the port number in the ConnectionIndex member. ConnectionIndex must be a value in the range of 1 to n, where n is the highest port number retrieved in a previous IOCTL_USB_GET_HUB_INFORMATION_EX I/O control request.

  • The caller must set a protocol flag in the SupportedUsbProtocols member (see USB_PROTOCOLS). In Windows 8, SupportedUsbProtocols.Usb300 must be set to 1. Otherwise, the request fails with the STATUS_INVALID_PARAMETER error code.

  • The caller must set the Length member to the size, in bytes, of the caller-allocated buffer pointed to by AssociatedIrp.SystemBuffer. The size of the buffer must be sizeof (USB_NODE_CONNECTION_INFORMATION_EX_V2).

Output Parameters

On output, the USB_NODE_CONNECTION_INFORMATION_EX_V2 structure that is pointed to by AssociatedIrp.SystemBuffer is filled with information about the attached device.

The Parameters.DeviceIoControl.OutputBufferLength member indicates the size, in bytes, of the output buffer SystemBuffer.

I/O Status Block

The USB stack sets Irp->IoStatus.Status to STATUS_SUCCESS if the request is successful. Otherwise, the USB driver stack sets Status to the appropriate error condition, such as STATUS_INVALID_PARAMETER or STATUS_INSUFFICIENT_RESOURCES.


The IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2 request queries the specified port's hub to get information about protocols supported by the port and the operating speed capability, if a device is attached to the port.

If the request completes successfully, the SupportedUsbProtocols.Usb200 member of USB_NODE_CONNECTION_INFORMATION_EX_V2 indicates protocols supported by the port. For instance, if the port supports signaling protocol defined by the USB 2.0 specification, then SupportedUsbProtocols.Usb200 is set to 1.

Note that SupportedUsbProtocols.Usb110 is always set to 1 for high-speed and full-speed hubs. That is because a high speed-capable hub supports USB 1.1 protocol through split transactions and transaction translators. SupportedUsbProtocols.Usb110 is never set to 1 for a USB 3.0 port.

In addition, the request also determines whether the port and the attached device are capable of operating at SuperSpeed. If they are, the Flags.DeviceIsSuperSpeedCapableOrHigher member is set to 1. If the device attached to the port is currently operating at SuperSpeed, then DeviceIsOperatingAtSuperSpeedOrHigher is set to 1.


Minimum supported client

Windows 8

Minimum supported server

None supported


Usbioctl.h (include Usbioctl.h)



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