In the TBT3-UDV specifications, it lists the USB ports as such:
Does this listing correspond to the number of underlying USB controllers in the dock driving the ports (with the ports in each line sharing the bandwidth of the controller/USB speed), or is it just an inventory of ports (that might have a different configuration of underlying USB controllers/shared bandwidth) and if so, what is the actual underlying configuration?
E.g., if a user plugged in 4 different USB-to-SATA SSD drives (each capable of 5 Gbps/~500 MB/s throughput) into the USB-A ports in the rear, would the drives in aggregate be capable of 20 Gbps/~2000 MB/s throughput (that, up to the PCIe x4 limit of the Thunderbolt uplink)? Or maybe just an aggregate 10 Gbps/~1000 MB/s, if each set of two rear USB-A ports have their own independent 5 Gbps USB controller (for 10 Gbps throughput combined), or maybe just 5 Gbps total, if all the ports actually share the same 5 Gbps controller under the hood?
Likewise for the front 5 Gbps USB-A port. Does it share bandwidth with any of the rear ports, or does it have an independent 5 Gbps capability
Thanks for any clarification!