You can connect hubs together to form a hierarchy, or "tree," of USB devices and hubs. You can have up to six levels of hubs and devices connected, with a maximum of 127 USB devices (including hubs) on each USB port on the computer.
Note: Some computers may only support connecting a maximum of 127 USB devices using both ports. For more information, see the USB specifications for your computer.
The hubs shown in the following illustration are all self-powered.
| Computer |  |
|
| Tier 1 | ||
| Tier 2 | ||
| Tier 3 | ||
| Tier 4 | ||
| Tier 5 | ||
| Tier 6 | ||
Note: You shouldn't use USB to connect two computers together.
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