instal the last version for apple USB Device Tree Viewer 3.8.9

When you connect a device on a usb port, the port would select one of the INTERNAL port for highest possible speed and route the data through that port. The interesting thing to note here is that each INTERNAL PORT is connected to only 1 EXTERNAL PORT, however each EXTERNAL port might be connected to more than 1 INTERNAL PORT for providing different speed standards. And finally each INTERNAL PORT is mapped to one EXTERNAL USB PORT that you can see with your eyes on the sides of a laptop or behind of pc case and plug your devices into.ġ External Physical Port connected to many Internal Ports

If there was no INTERNAL HUB, you would need a separate controller for each usb port which would be make the circuitry bigger and more expensive.Įach INTERNAL HUB houses multiple INTERNAL PORTS each of which can runs at a different speed.

Now a USB Controller (inside the computer) is connected to an 'INTERNAL HUB' (again somekind of ic chip) which allows connections from multiple USB ports to access the USB Controller.

What are Internal HUBs and Internal Ports Inside your computer there is something called a USB Controller which is an IC chip that enables the system to use usb technology and transfer data across compatible devices.

Instal the last version for apple USB Device Tree Viewer 3.8.9