USB Tree


The USB Tree is a great way to visualize the USB device tree for the host processor. USB has the concept of tiers: the host and root hub are on the first tier. A device connected to the root hub is on the second tier. If a hub is added in between the device and the root hub, the device moves down to the third tier. Up to 5 non-root hubs can be added in series for a maximum of 7 USB tiers (5 Hubs + root hub + device).

The USB Tree provides a simple visualization of the 7 hub tiers along with each device and how it is connected back to the host controller.





Depth of USB tree, up to 7

Port number

Physical port of the Acroname product the USB device is connected to (Only available when connected to Acroname products)

Connection speed

3 = USB 3 (blue = 10 Gb/s, green = 5 Gb/s)

2 = USB 2 480 Mb/s

1 = USB 1

Host controller

Host controller node, tier 1

Acroname device

Acroname devices are outlined in blue to for easy indentification

Stacked USB 2/3 hub

Hubs with both USB 2 and USB 3 connections are shown as stacks

Acroname device controller (stem)

Responsible for controlling the hub and communicating with ControlRoom

Device feature

USB device feature. ISO indicates that the device is capable of isochronous transfers such as streaming video and audio

USB Tree Comparisons

The USB Tree can be saved as a PDF with embedded data. The current tree can then be compared with a saved tree to easily identify changes.


Save USB Tree – saves to a PDF file. Saved USB Tree PDF files can be used as recipes for room designs

Compare the USB Tree – uploads a saved USB Tree PDF file for dynamic comparison with the current tree. USB devices that match the loaded USB Tree recipe will show a gray background. Missing devices will be shown in red and new devices in green. If a device has been moved to a different port, it will appear twice, once in green as new, and once in red as missing

Cancel Compare – cancels the USB Tree comparison

Summary – if the current tree does not match, a summary will be displayed indicating how many devices are new, and how many devices are missing