QUANTUM USB LAN CARD
Hi, My device Mac Pro doesn't recognise Quantum usb lan card in Big Sur
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There are different models of Quantum USB lan card. You probably need an updated driver for it.
Secondly, USB is very power specific. If it is a USB-C based card, or connected to a USB-C adapter, make sure the adapter has its own power charging it directly. When you say you have a Mac Pro, is that a tower, or a notebook MacBook Pro? The notebooks that come with USB-C have their owner powercord that can either go through one of these two adapters to ensure power power, and there is a built-in ethernet port on these adapters:
https://www.smklink.com/products/usb-c-multi-port-hub
https://www.siig.com/catalogsearch/result/?q=JU-DK0F11-S1
For desktops they have built-in ethernet ports in the back, which if broke, you can often add a PCI card that is supported by them to add support. IF you are talking the newer cheesegrater model. The black "trash-can" model there are Thunderbolt-2 ethernet adapters which work better than USB for ethernet connectivity.
Big Sur is not supported on the older Mac Pro desktops.