It's an USB slave (ie. device, not computer) port. Just like the USB/charging port on a cellphone is a slave which is meant to be connected to a PC on the other side via a micro B USB plug:No... debug port isn't usb. It is serial like old modem stuff.
Class Usage Description Examples, or exception 00h Device Unspecified Device class is unspecified, interface descriptors are used to determine needed drivers 01h Interface Audio Speaker, microphone, sound card, MIDI 02h Both Communications Modem, Ethernet adapter, Wi-Fi adapter, and CDC Control RS232 serial adapter. Used together with class 0Ah (below)