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Root Hub
Tier 1
Built-in Hub
Tier 2
Monitor
Tier 3
Monitor
Tier 4
Monitor
Tier 5
Tier 6
Monitor
Tier 7
Figure 1.
Tiered Star Topology Example for a Computer with Four Monitors
NOTE: Some computers include multiple hubs already connected to each other,
occupying multiple tiers in the topology. For example, many computers with USB
ports on the front and rear panels or computers with a built-in USB hub and a
compound USB peripheral device (such as a touch display) occupy two tiers. For
information about USB hubs used in Extron products, see the USB Hub Usage Chart
at www.extron.com.
To review the USB system architecture, count all the cascading hubs (including USB hubs
enclosed in computers and compound devices) between the host device and the last USB
peripheral device.
NOTE: If the host device runs Windows
following programs to view the hierarchical relationships between USB devices:
•
Windows: Device Manager
•
macOS: System Profiler or System Information
PC
Camera
Speaker
Hub
Compound Device
Keyboard
Mouse
or macOS™ operating systems, use the
®
= USB hub
= USB peripheral device
UCS 303 • Introduction
4
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