A USB 3.0 hub provides one upstream SuperSpeed port and up to 4 downstream SuperSpeed ports. It also contains a USB 2.0 hub section for backward compatibility, effectively combining two hubs in one device.
| Pin | Name | Function | Type |
|---|---|---|---|
| UP_SS | Upstream SS Port | SuperSpeed connection to host | BUS |
| UP_20 | Upstream USB 2.0 Port | USB 2.0 connection to host | BUS |
| DN1_SS | Downstream SS Port 1 | SuperSpeed to device 1 | BUS |
| DN2_SS | Downstream SS Port 2 | SuperSpeed to device 2 | BUS |
| DN3_SS | Downstream SS Port 3 | SuperSpeed to device 3 | BUS |
| DN4_SS | Downstream SS Port 4 | SuperSpeed to device 4 | BUS |
| VBUS | VBUS | 5V power 900mA per port | PWR |
| GND | GND | Ground | GND |
A USB 3.0 hub provides one upstream SuperSpeed port and up to 4 downstream SuperSpeed ports. It also contains a USB 2.0 hub section for backward compatibility, effectively combining two hubs in one device.